Wireless power has become a hot topic as wireless charging of mobile devices is get getting some popularity. Wireless charging isn’t something new; the technology exists since 1981 and Nikola Tesla has made first wireless power experiments over 100 years ago. Wireless charging for Qi technology is becoming the industry standard on smartphones (pushed by Wireless Power Consortium) as Nokia, HTC and some other companies use that. There is a competing AW4P wireless charging standard pushed by Samsung ja Qualcomm. And there is more standards coming. Power Matters Alliance is heavily pushing their own wireless charging standard. It seems there is going to be fight on wireless charging in near future. It seems that right now we’re in the midst of a battle between two standards for wireless charging – Qi from the Wireless Power Consortium and Power 2.0 from the Power Matters Alliance. It seems that a common Wireless Power Standard Years Off as Battle Heats Up.
As obviously useful as wireless charging is, it suffers from a Tower of Babel problem with incompatible standards and competing interests keeping it from truly going mainstream. Wireless charging continues to be a niche category until there’s a common standard. Heavyweights are backing the idea of wireless charging capabilities embedded in phones, and public charging stations are beginning to pop up. Differing standards, however, still make for a rocky adoption. Realistically there probably isn’t room for two or more standards, which do essentially the same to end user but are incompatible, so expect some technologies to disappear in the near future. Charging portable devices without needing to carry a power adapter sounds handy when we can agree on one standard. “Wireless charging continues to be a niche category until there’s a common standard,” said Daniel Hays, a consultant with PricewaterhouseCoopers. “The hassle factor is still high.”
Qi seems to be at the moment standard that gets most attention. The news that Nokia to join Qi party with wireless-charging Lumia 920 have given lots of publicity to it. Even if the Lumia isn’t a big seller, the publicity and visibility it will provide for Qi should be enough to make everyone forget there was ever an alternative, if indeed there ever was. Also some HTC phones and Nexus 4 phone use this standard. Toyota launches the world’s first wireless charging of mobile phones in the car. Toyota’s car will get wireless mobile phone charger using Qi standard.
Qi has been here for some years. Qi has been around for a while, gaining the name and logo back in 2009. The Qi standard came out of water filtration units, which needed wireless power, and has been widely endorsed but devices are still quite rare. Under the Qi specification, “low power” for inductive transfer means a draw of 0 to 5 W, and that’s where mobile device charging solutions most probably go. The system used inductive coupling between two planar coils to transfer power from the power transmitter to the power receiver. The distance between the two coils is typically 5 mm, but can be expanded to 40mm.
The Qi system uses a digital control loop where the power receiver communicates with the power transmitter and requests more or less power via backscatter modulation. Besides low-power specification up to 5 watts, there is also a medium-power specification will deliver up to 120 watts. The frequency used for Qi chargers is located between about 110 and 205 kHz for the low power Qi chargers up to 5 watts and 80-300 kHz for the medium power Qi chargers.
Qi
Method: inductive coupling between two planar coils
Frequency: 110-205 kHz (80-300 KHz)
Communication: backscatter modulation
WiPower was a technology start-up company that used the principles of inductive coupling to develop a near-field wireless energy transfer system. Qualcomm bought WiPower in 2010 and started quietly negotiating with manufacturers to get the technology embedded in their kit. Qualcomm argues that the additional range of WiPower (which can charge devices up to 45mm away) allows new possibilities. WiPower system is based on modified coreless inductive technology and dynamically adjusts power supplied by the transmitter to power demanded by the receiver without the need for control systems or communication. WiPower chargers are claimed to operate at about 60-75 percent efficiency.
WiPower
Method: inductive coupling
Communication: no need for specific communication
Samsung and Qualcomm’s Alliance for Wireless Power (A4WP) promises more flexibility in wireless charging. Instead of induction, this standard will use loosely-coupled (LC) wireless power transfer (a series resonance-tuned pair of magnetically-coupled coils) to transmit power. This construction allows that the transmitter and receiver don’t have to be in direct contact, which gives more flexibility to industrial designers. This designs will support simultaneous charging of multiple devices with different power requirements. A4WP specification takes advantage of Bluetooth 4.0. The biggest downside in this design is that currently there are no products with this technology are yet on the market.
A4WP
Method: series resonance-tuned pair of magnetically-coupled coils (loosely coupled)
Frequency: 6.78 MHz
Communications: Bluetooth 4.0
The Power Matters Alliance (PMA) is working on an open standard for wireless charging. A group of companies back up this initiative (including Google, AT&T, ZTE, Starbucks, ,McDonalds, PowerKiss). PMA uses inductive charging method used in Duracell’s Powermat product. It requires the transmitter and receiver be close together, placing the mobile device on the charging pad.
This is quite new alliance but it seems to get lots of backers: over the last few months, the PMA has seen a tenfold increase in membership. One very big thing is that AT&T is seeking from its handset vendors a commitment to one standard of wireless charging.
The PMA is working to advance the widespread acceptance of the wireless power paradigm in multiple sectors. PMA is intent on leading and organizing the Power 2.0 agenda to commercial realization, while working under the umbrella of the most trusted name in standards: the IEEE. Powermat is capable of delivering 5-to-50 watts of power. Powermat allows a built-in check for alignment via light and voice signals based on RFiD Handshake feature. When you place a Powermat-enabled device on one of its mats, the two exchange a “handshake” using RFID: The mat identifies the device, determines how much power it needs and transfers energy to it. Powermat operates at 277-357 kHz frequency. Once a device is fully charged, Powermat stops the electricity from flowing. But as much momentum as the PMA has achieved, it is far from clear whether it will be that bandwagon.
Power Matters Alliance (PMA)
Method: inductive charging
Frequency: 277-357 kHz
Communication: RFID
As obviously useful as wireless charging is, it suffers from a Tower of Babel problem with incompatible standards and competing interests keeping it from truly going mainstream. There are also attempts to support several standards on one product. Samsung Galaxy SIII wireless power supports both Qualcomm’s WiPower and Wireless Power Consortium Qi. The Samsung Galaxy S4 will support both PMA and Qi standards. NXP has developed a charging station, which allows you to use both the general mobile phone charging standards (as well as one rare third standard).
The technologies I mentioned are not the only ones trying to push to the market in the near future. Apple is trying to patent wireless charging, claiming its magnetic resonance tech is new and that it can do it better than anyone else. Digitoday writes that Finnish research organization VTT is planning to combine wireless power and NFC technologies. The reasearchers believe that in the future NFC devices could be made to work as way to get power into device and send power to other device cheaply. Technology is not ready yet, because today’s NFC antenna circuits are not optimized for power transfer and there is no standard that covers this kind of use yet. NFC operates within the globally available and unlicensed radio frequency ISM band of 13.56 MHz.
Wireless Power: Convenient, But Its Shortcomings Are Somewhat Sour article tells that close-proximity inductive coupling is commonly estimated to deliver 50 to 70% efficiency. That’s considerably worse efficiency that what you get with a well designed wired charger. Intel increases consumer-product power consumption 50% blog post says that a system that is 50% efficient on top of the ac-dc conversion, and pumps RF energy all over the place is far from ideal in world where some other parties try to conserve every single watt. In a world with 15 billion chargers, energy efficiency is a big deal. Based in that is makes me a little bit hard to believe the Power Matter Alliance claims that wireless charging could save a lots of power in the future. How Wireless Charging Will Keep Toxic Waste Out of Landfills article tries to describe how wireless power could be more eco-friendly, but it is hard to believe all those claims without good data. I can believe that wireless chargers can have better energy efficiency than some old chargers supplied with consumer devices, but I given the limitations wireless charging it is very hard to believe that wireless charger could ever be more efficient than well designed wired charger. But wireless charger could be well “good enough” to be acceptable.
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Tomi Engdahl says:
Partnership to Bring Over-the-Air Wireless Charging to Smartphones
https://www.eeweb.com/profile/eeweb/news/partnership-to-bring-over-the-air-wireless-charging-to-smartphones
Energous, the developer of WattUp wireless charging 2.0 technology, is teaming up with vivo Global, a Chinese smartphone manufacturer, to explore integrating WattUp into smartphone designs that will be capable of charging wirelessly over-the-air. The two companies expect the collaboration to bring WattUp distance charging to consumers and drive forward second-generation wireless charging.
A scalable RF-based technology, WattUp differs from older wireless charging systems because it supports power at-contact, as well as at-a-distance, enabling a charging ecosystem that frees users from always having to actively charge or manage batteries.
https://energous.com/
Tomi Engdahl says:
Teardown: Wireless charging pad is tough to crack
https://www.edn.com/design/consumer/4461732/Teardown–Wireless-charging-pad-is-tough-to-crack
Tomi Engdahl says:
Craig Lloyd / iFixit:
A theory on Apple’s AirPower: its overlapping multi-coil design worked in the lab but complying with FCC’s rules for safe wireless emissions was too challenging
What Finally Killed AirPower
https://ifixit.org/blog/14883/what-finally-killed-airpower/
In a surprising turn of events, Apple has cancelled its long-awaited AirPower wireless charging mat. The company says the product didn’t meet its “high standards,” but wasn’t specific as to why. We’ve been watching this space carefully and have an informed guess as to what happened.
AirPower was first introduced to the public in September of 2017
Apple planned on releasing AirPower the year after the iPhone X, in 2018.
Starting in 2019, though, a glimmer of hope emerged
Overheating and Interference
Managing these overlapping harmonic frequencies is incredibly challenging, and gets harder the more coils that you are integrating. From patent filings, it looks like Apple’s ambitious plan was to use considerably more coils than other charging pads on the market.
Other multi-device wireless chargers place two or three coils side-by-side
”Well, so what always happens is you get it functional first. No one looks at [Electro-Magnetic Interference] until the end.” The FCC rules for wireless charging devices like AirPower are quite strict, and limit exposure at 20 cm (8 in) above the device to 50 mW/cm^2.
Rumors have circulated for months about AirPower’s overheating issues, which would click nicely into place with this theory.
Tomi Engdahl says:
Oslo to Install Wireless Fast-Charging System for Taxis
All taxis in the Norwegian capital must be electrically powered by 2023. Automated wireless charging will pave the way.
https://www.electronicdesign.com/automotive/oslo-install-wireless-fast-charging-system-taxis?NL=ED-003&Issue=ED-003_20190404_ED-003_218&sfvc4enews=42&cl=article_2_b&utm_rid=CPG05000002750211&utm_campaign=24635&utm_medium=email&elq2=0ed1878a9ee74fd2bfe7fd6bfddc1fc4
Tomi Engdahl says:
Wireless charging: The state of disunion
https://www.edn.com/electronics-blogs/brians-brain/4461755/Wireless-charging–The-state-of-disunion
I’d thought that Qi (from the Wireless Power Consortium) was still officially specified as only working up to 5W, and that the higher-power “fast” charging approaches from Apple, LG, Samsung, and others were all proprietary … this ends up not being the case, at least not exactly. Then there’s the dueling dual-standard alternative approach offered up by the merged-in-2015 Alliance for Wireless Power (A4WP) and Power Matters Alliance (PMA), now known as the AirFuel Alliance. And what about medium-power applications like home appliances and power tools … and high power applications like electric vehicles? I’ll touch on all of these topics in coverage to come.”
Inductive coupled wireless charging
Capacitive coupled wireless charging
One potentially obvious advantage of the inductive and capacitive coupled approaches in particular, thereby explaining the technology’s frequent use with appliances found in bathrooms and other environments where water-induced electrocution is a possibility, is that both the energy source and battery can be completely embedded within the (respective) charger and destination device, electronically insulated not only from each other but also more generally from all other environmental factors.
Inefficiency versus traditional corded charging schemes is one key shortcoming of any wireless charging approach, with the degree of inefficiency being to some degree implementation-dependent.
As mentioned earlier, the Wireless Power Consortium’s Qi is the predominant wireless charging approach in the market today, courtesy of its widespread (and growing) adoption in smartphones, tablets, smartwatches, and the like. Also as mentioned earlier, Qi was initially specified as supporting “Basic Power Profile” transmission and reception up to 5W (and often less, for small-capacity battery applications such as wearables).
beginning with spec v1.2 (albeit not absent controversy), the “Industrial and Consumer Extended Power Profile” (EPP) expanded power transfer capabilities up to 15W
Samsung officially specs its “fast charge” at 9W (thereby explaining the 9V@1A specification of the charging pad I tore down). Competitor LG followed with “10W” one-upmanship. Always-conservative Apple eventually launched its first wireless charging-capable phone, the iPhone X, at 7.5W in late 2017.
AirFuel Alliance competitor to Qi is still fighting the good fight publicly, behind the scenes it’s probably retooling for those medium- and high-power alternative applications
Tomi Engdahl says:
Resonant wireless charging is more user-friendly than inductive wireless charging, as the receiver only needs to be placed somewhere in the vicinity of the transmitter (typically up to 30 mm of vertical freedom). And multiple devices of different size and power can be charged in parallel.
AirFuel offers a resonant technology that operates at 6.78 MHz. To develop resonant solutions, two main topologies can be used: Class D (full-bridge or half-bridge) and Class E (single-ended or differential) amplifier.
https://www.infineon.com/cms/en/applications/power-supplies/wireless-charging/?elq_mid=3925&elq_cid=489977&ic=#resonant
Tomi Engdahl says:
Wireless charging: The state of disunion
https://www.edn.com/electronics-blogs/brians-brain/4461755/Wireless-charging–The-state-of-disunion?utm_content=bufferf2fe2&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
Tomi Engdahl says:
With the USB Type-C Authentication and the WPC Qi Authentication Standard, the USB Implementers Forum (USB-IF) and the Wireless Power Consortium (WPC) are enabling certified authentication standards.
Tomi Engdahl says:
https://www.electronicproducts.com/Power_Products/Power_and_Control/Wireless_charging_basic_design_considerations.aspx?utm_content=buffer9e81a&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer
Tomi Engdahl says:
Ossia’s Wireless Charging Tech Could Be Available By Next Year
https://spectrum.ieee.org/energywise/consumer-electronics/gadgets/ossias-wireless-charging-tech-may-be-available-by-2020
Wireless power company Ossia has received authorization from the U.S. Federal Communications Commission (FCC) for its Cota wireless power system. The FCC authorization is a crucial step toward Ossia’s goal of seeing devices that incorporate Cota on the market in 2020.
While supplying power wirelessly seems like a promising idea in theory, the technology has been explored for years and its reality has never quite lived up to the hype.
There’s been no shortage of ideas for wireless charging methods; startup uBeam, for example, has promised ultrasonic power transmitters but struggled to deliver for years. Energous, another startup, sells a charger that uses beamforming to create pockets of 900 MHz radio waves to provide power to nearby devices.
Ossia’s approach with Cota is similar to Energous in the sense that Cota uses radio waves to provide power (though in Cota’s case, it’s via 2.4 GHz radio waves). But Cota goes a step further, by homing in on devices and directing radio waves at them. Ossia’s approach is more precise than Energous’ approach, and allows users to handle and move devices without worrying about accidentally removing the device from the pocket of RF energy. Devices ping Cota up to 100 times per second with their locations, and Cota then beams power right back along the path it received the signal from.
Tomi Engdahl says:
uBeam is sinking
https://youtu.be/t1R9IQF0Y9s
Tomi Engdahl says:
This Battery-Free LED Coaster Is Charged Wirelessly
https://blog.hackster.io/this-battery-free-led-coaster-is-charged-wirelessly-b4942bfb164
Tomi Engdahl says:
https://www.eeweb.com/profile/eeweb/news/fully-integrated-wireless-charging-ic-enables-efficient-power-transfer
Tomi Engdahl says:
https://etn.fi/index.php/13-news/10477-virtaa-laitteeseen-langattomasti-nfc-lla
Tomi Engdahl says:
https://innovate.ieee.org/innovation-spotlight/wireless-power-charge-uav-drone/#utm_source=Facebook&utm_medium=social&utm_campaign=Innovation&utm_content=wireless%20charging?LT=CMH_WB_2020_LM_XIS_Paid_Social
“Normally, UAVs are capable of uninterruptedly running for 20-60 minutes,” said researcher Hadi Heidari. “As soon as you add a payload to the UAV this time drops. We wanted to address this longevity by offering wireless power transfer stations, allowing drones to charge autonomously at different locations.”
This wireless power transfer station could be positioned at multiple locations, bypassing the need for a UAV to visit a particular location to charge, and increasing the radius of operation.
This proposed charging station utilizes inductive coupling to power the drone.
The closer the drone is to the charging pad, the greater the voltage and charge that can be generated. The researchers found that a distance of 12cm or less is ideal to charge the drone’s battery. When the primary coils on the pad and the receiving coils on the drone are separated beyond this distance, the charging will stop.
Tomi Engdahl says:
Japan space scientists make wireless energy breakthrough
https://m.phys.org/news/2015-03-japan-space-scientists-wireless-energy.html
Researchers used microwaves to deliver 1.8 kilowatts of power—enough to run an electric kettle—through the air with pinpoint accuracy to a receiver 55 metres (170 feet) away.
While the distance was not huge, the technology could pave the way for mankind to eventually tap the vast amount of solar energy available in space and use it here on Earth
Tomi Engdahl says:
Using a single antenna for both NFC and charging, devices adhering to the NFC Forum’s standard will be able to draw down up to 1W of power.
NFC Forum Approves Wireless Charging Specification for Up to 1W of Power Using Existing NFC Antennas
https://www.hackster.io/news/nfc-forum-approves-wireless-charging-specification-for-up-to-1w-of-power-using-existing-nfc-antennas-f7b6dd7f7dbf
Using a single antenna for both NFC and charging, devices adhering to the new standard will be able to draw down up to 1W of power.
The Wireless Charging Specification, approved by the NFC Forum this week, is different: It allows devices to use a single antenna for both communications and charging.
Under the standard, devices will be able to pull down power at a rate of up to one watt from compatible chargers — which will range from dedicated chargers plugged into the wall and built into battery banks to a simple smartphone, which can charge and power a device as it communicates over NFC. Power can be provided statically, as with existing NFC-powered devices, or in a negotiated mode at rates from 240mW to 1W.
The NFC Forum has published the specification to its website, but as with its other specifications it is accessible only to member organisations and paying customers.
Tomi Engdahl says:
DIY Wireless Electricity Transmission | Technology behind Wireless Mobile Charging
https://www.youtube.com/watch?v=y4Tg7mvHY-g
Appslure WebSolution says:
Appslure is mobile app development company. we provide android app development and ios app development services.
Tomi Engdahl says:
This startup says it can send electric power over long distances without copper wire.
Nikola Tesla Proved It Was Possible. Now Wireless Electricity Is a Reality.
https://www.popularmechanics.com/science/a33522699/wireless-electricity-new-zealand/?utm_medium=social-media&utm_source=facebook&utm_campaign=socialflowFBPOP
This startup says it can send electric power over long distances without copper wire.
In New Zealand, the government is sponsoring a wireless electricity startup’s work and testing.
The system involves shaped microwave beams that pass through relays, like repeaters.
Nikola Tesla did the first air-power experiments 12o years ago, but copper wire superseded everything else.
An energy startup named Emrod says it’s bringing wireless electricity to New Zealand, more than a century after Nikola Tesla first demonstrated it was possible. Like the best-performing satellite internet connections, Emrod’s link only needs a clear line of sight.
By eliminating the need for long stretches of traditional copper wiring, Emrod says it can bring power to more difficult terrain and places that just can’t afford a certain level of physical infrastructure. There could be environmental ramifications as well, since many places that are off the grid end up using diesel generators, for example.
Right now, Emrod is testing over a “tiny” long distance—sending “a few watts” back and forth about 130 feet
“Energy is transmitted through electromagnetic waves over long distances using Emrod’s proprietary beam shaping, metamaterials and rectenna technology,” Emrod explains.
The “rectenna” turns magnetic waves into electricity. A square element mounted on a pole acts as the pass-through point that keeps electricity beaming along, and a broader surface area catches the entire wave, so to speak. The beam is surrounded by a low-power laser fence so it won’t zap passing birds or passenger vehicles. If there’s ever an outage, Emrod says it can drive out a truck-mounted rectenna to make up for any missing relay legs.
Tomi Engdahl says:
1. Tesla saying or “demonstrating” something doesn’t mean it’s possible or useful
2. It will have to follow the inverse square law, which means it will be basically useless. (I.e., broadcast megawatts, receive microvolts only a few miles away)
3. PopSci or PopMech are worthless rags and will report fake “discoveries” every month. Just look through their old issue covers.
Tomi Engdahl says:
After first announcing its multi-device smart wireless charger back in 2017, Apple officially canceled AirPower in March of 2019. Now a video has surfaced that shows a teardown of an alleged AirPower prototype revealing an intricate design. [ 258 more words ]
https://9to5mac.com/2020/08/21/airpower-prototype-teardown-likely-shows-why-apple-never-shipped-the-wireless-charger/
Tomi Engdahl says:
Since Tesla, engineers have dreamed of large-scale wireless power transmission. Many have tried, none have succeeded in making it a practical success. Now New Zealand start-up Emrod says they are close.
Emrod Chases The Dream Of Utility-Scale Wireless Power Transmission
https://spectrum.ieee.org/energywise/energy/the-smarter-grid/emrod-chases-the-dream-of-utilityscale-wireless-power-transmission
California wildfires knock out electric power to thousands of people; a hurricane destroys transmission lines that link electric power stations to cities and towns; an earthquake shatters homes and disrupts power service. The headlines are dramatic and seem to occur more and more often.
The fundamental vulnerability in each case is that the power grid relies on metal cables to carry electricity every meter along the way. Since the days of Nikola Tesla and his famous coil, inventors and engineers have dreamt of being able to send large amounts of electricity over long distances, and all without wires.
During the next several months, a startup company, a government-backed innovation institute and a major electric utility will aim to scale up a wireless electric power transmission system that they say will offer a commercially viable alternative to traditional wire transmission and distribution systems.
The underlying idea is nothing new: energy is converted into electromagnetic radiation by a transmitting antenna, picked up by a receiving antenna, and then distributed locally by conventional means. This is the same thing that happens in any radio system, but in radio the amount of power that reaches the receiver can be minuscule; picking up a few picowatts is all that is needed to deliver an intelligible signal.
Emrod’s laboratory prototype currently operates indoors at a distance of just 2 meters. Work is under way to build a 40-meter demonstration system, but it, too, will be indoors where conditions can be easily managed. Sometime next year though Emrod plans a field test at a still-to-be-determined grid-connected facility operated by Powerco, New Zealand’s second largest utility with around 1.1 million customers.
In an email, Powerco said that it is funding the test with an eye toward learning how much power the system can transmit and over what distance.
Tomi Engdahl says:
Since Tesla, engineers have dreamed of large-scale wireless power transmission. Many have tried, none have succeeded in making it a practical success. Now New Zealand start-up Emrod says they are close.
Emrod Chases The Dream Of Utility-Scale Wireless Power Transmission
https://spectrum.ieee.org/energywise/energy/the-smarter-grid/emrod-chases-the-dream-of-utilityscale-wireless-power-transmission
What’s new here is how New Zealand startup Emrod has borrowed ideas from radar and optics and used metamaterials to focus the transmitted radiation even more tightly than previous microwave-based wireless power attempts.
The “quasi-optical” system shapes the electromagnetic pulse into a cylindrical beam, thus making it “completely different” from the way a cell phone tower or radio antenna works, said Dr. Ray Simpkin, chief science officer at Emrod, which has a Silicon Valley office in addition to its New Zealand base.
Emrod’s laboratory prototype currently operates indoors at a distance of just 2 meters. Work is under way to build a 40-meter demonstration system, but it, too, will be indoors where conditions can be easily managed. Sometime next year though Emrod plans a field test at a still-to-be-determined grid-connected facility operated by Powerco, New Zealand’s second largest utility with around 1.1 million customers.
In an email, Powerco said that it is funding the test with an eye toward learning how much power the system can transmit and over what distance.
the system must meet a number of safety, performance and environmental requirements.
One safety feature will be an array of lasers spaced along the edges of flat-panel receivers that are planned to catch and then pass along the focused energy beam. These lasers are pointed at sensors at the transmitter array so that if a bird in flight, for example, interrupted one of the lasers, the transmitter would pause a portion of the energy beam long enough for the bird to fly through.
Emrod’s electromagnetic beam operates at frequencies classified as industrial, scientific and medical (ISM). The company’s founder, Greg Kushnir, said in a recent interview that the power densities are roughly the equivalent of standing in the sun outside at noon, or around 1 kW per square meter.
Emrod sees an opportunity for utilities to deploy its technology to deliver electric service to remote areas and locations with difficult terrain. The company is looking at the feasibility of spanning a 30-km strait between the southern tip of New Zealand and Stewart Island. Emrod estimates that a 40-square-meter transmitter would do the job. And, although without offering detailed cost estimates, Simpkin said the system could cost around 60 percent that of a subsea cable.
Another potential application would be in post-disaster recovery. In that scenario, mobile transmitters would be deployed to close a gap between damaged or destroyed transmission and distribution lines.
The company has a “reasonable handle” on costs, Simpkin said, with the main areas for improvement coming from commercially available transmitter components. Here, the company expects that advancements in 5G communications technology will spur efficiency improvements. At present, its least efficient point is at the transmitter where existing electronic components are no better than around 70 percent efficient.
Comment https://www.facebook.com/48576411181/posts/10158676162036182/
1kW/m2. Not really viable for anything other than disaster relieve or the occasional remote island of 2 houses yet. Plus will need to come with a fairly hefty battery backup as they’re expecting brown-outs due to the safety mechanisms preventing wildlife being fried.
Tomi Engdahl says:
Momentum Dynamics’ wireless charging pads can keep EVs topped up while they park, and they are already being tested in electric bus trials.
Wireless Charging Tech to Keep EVs on the Go
https://spectrum.ieee.org/cars-that-think/transportation/advanced-cars/wireless-charging-tech-to-keep-evs-on-the-go
Norway, already a world leader in EV adoption, will soon mark a world’s first: An Oslo-based fleet of Jaguar I-Pace taxis that can charge wirelessly even as they queue up for passengers.
That inductive charging technology, developed by a former NASA engineer at Pennsylvania-based Momentum Dynamics, aims to solve perhaps the biggest disconnect in EVs: How to bring convenient charging to the urban masses—including apartment dwellers and drivers of taxis, buses, and delivery trucks—without clogging every inch of prime real estate with bulky, unsightly chargers. The conundrum becomes more pressing with the introduction of new electric models, and each additional government mandate for fewer fossil-fueled cars and lower carbon emissions.
A great example of that action to combat climate-change is Oslo, whose ambitious ElectriCity plan will require that all taxis produce zero tailpipe emissions by 2024—effectively banning even gasoline-electric hybrid models. The result of punitive taxes on fossil-fueled cars and enticing incentives for electric models: 50 percent of Norway’s new cars are now EVs, a higher percentage by far than any nation.
Norway’s government has decreed that all new cars must be zero-emissions by 2025.
That carrot-and-stick urgency led to a partnership between Jaguar, Momentum Dynamics, Nordic taxi operator Cabonline, and charging company Fortam Recharge. The group aims to create the world’s first wireless-charging taxi fleet. To that end, Jaguar is equipping 25 I-Pace SUVs with Momentum Dynamic’s inductive charging pads.
The pads, which are about 60 cm square, are rated at 50 to 75 kilowatts.
Using resonant magnetic coupling operating at 85 hertz, a charging pad will route enough energy to a taxi’s batteries add about 80 kilometers of range for every 15 minutes hovering over the inductive coils
electric bus trials in four U.S. cities. The transit trials featured a Chinese-built BYD bus in Wenatchee, Wash. that slurped energy from a charging pad installed along its route at a rate of 200 kilowatts. That’s on par with some of the fastest DC chargers, enough to “keep the bus in 24/7 operation, without ever going back to the garage” to recharge
The company claims its technology delivers 94-percent charging efficiency, which holds steady as scalable power climbs to 200 or even 350 kilowatts. That’s a winning contrast with DC fast chargers, whose efficiency drops sharply at higher power because of massive resistance and the resulting heat that demands liquid-cooled cables, which themselves create more energy losses.
Recharge Infra tabbed Momentum Dynamics after learning it could deliver 50 kilowatts or more through a roughly 18-centimeter air gap between vehicle and pavement—a huge improvement over companies that promised no more than 11 kilowatts.
Backers cite several spin-off benefits. With systems buried entirely underground, the plan eliminates: chargers to compete for prime parking space or sidewalks; moving parts and worries about vandalism or damage from elements; and wired infrastructure, including unsightly towers and arms for electric buses, to pollute the view.
Tomi Engdahl says:
In-Vehicle Controller Wirelessly Charges Two Mobile Devices at Once
Single controller simultaneously charges two Qi-enabled mobile devices at up to 2 x 15 W.
https://www.mwrf.com/technologies/semiconductors/article/21140425/invehicle-controller-wirelessly-charges-two-mobile-devices-at-once?utm_source=RF+MWRF+Today&utm_medium=email&utm_campaign=CPS200827066&o_eid=7211D2691390C9R&
Tomi Engdahl says:
Power transfer for wireless charging in electric vehicles
https://www.edn.com/power-transfer-for-wireless-charging-in-electric-vehicles/
Tomi Engdahl says:
New Zealand To Test Wireless Power Transmission
https://hackaday.com/2020/09/10/new-zealand-to-test-wireless-power-transmission/
Nikola Tesla wanted to beam power without wires. NASA talked about building power-generating satellites that would do the same thing. But now New Zealand’s second-largest power utility — Powerco — is working with a start-up company to beam energy to remote locations. There have been several news releases, but possibly the most technical detail is from an interview [Loz Blain] did with the founder of the startup company.
It isn’t really news that you can send radio waves somewhere and convert the signal back into power. Every antenna does that routinely. The question is how efficient is the power transmission and — when the power levels are high — how safe is it? According to [Greg Kushnir], the founder of Emrod, the technology is about 70% efficient and uses ISM frequencies.
According to [Kushnir], the technology relies on metamaterials that are very efficient and a beam that sends all the power to the receiver, possibly through some passive relay stations [Kushnir] claims are like lenses and nearly lossless. Reading between the lines, it sounds like a modern take on the MASER with very good receiving antennas.
New Zealand’s wireless power transmission: Your questions answered
https://newatlas.com/energy/wireless-power-transmission-emrod-interview/?itm_source=newatlas&itm_medium=article-body
Tomi Engdahl says:
https://emrod.energy/
Tomi Engdahl says:
FCC Approval for WiBotic’s Wireless Charging System
https://www.eetimes.com/fcc-approval-for-wibotics-wireless-charging-system/
WiBotic has announced it obtained authorization from the Federal Communications Commission (FCC) for its 300W high power transmitters and receivers for wireless charging of drones, mobile robots, and other commercial/industrial battery-powered devices operated in the U.S. WiBotic is working to obtain other certificates allowing similar approvals of their products in other countries.
As Ben Waters, CEO of WiBotic, points out, this certification represents a transition point in the industry as, in the past, only low-power cell phone and high-power battery chargers for electric vehicles had been approved for such a widespread use. WiBotic’s technology allows drones and medium-sized robots to be recharged quickly, thus making it possible to use drone and robot technology for various industrial applications such as transport and safety.
Wireless charging
Inductive coupling and MR (magnetic resonance) are the two methods being used by the most common Wireless Power Transfer systems. Each method has its strengths and weaknesses. WiBotic has attempted to get the best of both worlds by including both. Its patented Adaptive Impedance Matching system constantly monitors relative antenna position and dynamically adjusts both hardware and firmware parameters to maintain maximum efficiency.
The firmware allows users to monitor and set charging parameters. The onboard charger unit directly accesses the transmitter to perform the required functions. The system architecture allows for reduced downtime and overall maintenance costs.
FCC for WiBotic
The reliability of electrical charging systems is a fundamental prerequisite to greater device autonomy, with less human intervention and maintenance. WiBotic high-power wireless charging systems can charge a wide variety of robots, drones, and industrial automation equipment.
Automation-driven robots and drones are and will be increasingly faced with stricter safety and emissions regulations. “FCC approval allows us to meet the customers’ demand by providing standard products to a rapidly growing industry,” said Waters.
“FCC approval is a major achievement, representing thousands of hours of product development and testing,” Waters said. “Engineering of WiBotic’s projects to comply with FCC requirements has been a non-trivial task.”
“In general, the three areas for which our system needs to be tested are safety, radiated emissions, and conducted emissions,” said Waters.
Safety is defined by SAR or specific absorption rate as in the case of cell phones.
Apart from wireless charging, there are evolving standards to prove robots comply with safety certificates. There is also an ISO standard for robot safety which is related to electrical safety guidelines that are largely governed by IEC, the world standard for electronics.
Tomi Engdahl says:
Huawei wants to charge your phone with lasers: Here’s when we could see it
https://www.androidauthority.com/huawei-laser-wireless-charging-1160495/
Huawei has filed a patent for true wireless charging via lasers.
This would allow you to charge your phone without placing it on a pad or using a cable.
Huawei expects laser wireless charging to land in phones within two or three generations.
Charging, Unwired
https://www.youtube.com/watch?v=FW8KbDfwgx8
Tomi Engdahl says:
Jon Porter / The Verge:
Huawei debuts €1,199 Mate 40 Pro and €1,399 Pro Plus, with 5nm Kirin 9000 chip, 6.76″ display, 50 MP main camera, 50W wireless charging, available Nov. 13 in UK
Huawei’s Mate 40 Pro announced with speedy 50W wireless charging
Plus a new flagship Kirin 9000 processor
https://www.theverge.com/2020/10/22/21528249/huawei-mate-40-pro-plus-release-date-news-features-price-specs-cameras?scrolla=5eb6d68b7fedc32c19ef33b4
Tomi Engdahl says:
https://techcrunch.com/2020/09/30/googles-pixel-5-get-reverse-wireless-charging-and-5g-for-699/
Tomi Engdahl says:
Joe Rossignol / MacRumors:
Apple warns magnets in iPhone 12 models and MagSafe devices may affect pacemakers and should be kept at least 6″ away from medical devices or 12″ while charging — Since the launch of iPhone 12 models in October, Apple has acknowledged that the devices may cause electromagnetic interference …
Apple Elaborates on Potential for iPhone 12 and MagSafe Accessories to Interfere With Implantable Medical Devices
https://www.macrumors.com/2021/01/23/apple-updates-iphone-magnet-support-document/?scrolla=5eb6d68b7fedc32c19ef33b4
Since the launch of iPhone 12 models in October, Apple has acknowledged that the devices may cause electromagnetic interference with medical devices like pacemakers and defibrillators, but the company has now shared additional information.
Apple added the following paragraph to a related support document today:
Medical devices such as implanted pacemakers and defibrillators might contain sensors that respond to magnets and radios when in close contact. To avoid any potential interactions with these devices, keep your iPhone and MagSafe accessories a safe distance away from your device (more than 6 inches / 15 cm apart or more than 12 inches / 30 cm apart if wirelessly charging). But consult with your physician and your device manufacturer for specific guidelines.
While the support document already mentioned “MagSafe accessories” in the title, Apple has further emphasized that accessories like the MagSafe Charger and MagSafe Duo Charger may also interfere with medical devices:
All MagSafe accessories (each sold separately) also contain magnets—and MagSafe Charger and MagSafe Duo Charger contain radios. These magnets and electromagnetic fields might interfere with medical devices.
Apple continues to state that while all iPhone 12 models contain more magnets than prior iPhone models, they are “not expected to pose a greater risk of magnetic interference to medical devices than prior iPhone models.”
Earlier this month, an article in the Heart Rhythm Journal indicated that iPhone 12 models can “potentially inhibit lifesaving therapy in a patient” due to magnetic interference with implantable medical devices. Three doctors in Michigan tested this interaction by holding an iPhone 12 near a patient’s implantable cardioverter defibrillator, which immediately went into a “suspended” state for the duration of the test, according to the article.
Life Saving Therapy Inhibition by Phones Containing Magnets
https://www.heartrhythmjournal.com/article/S1547-5271(20)31227-3/fulltext
Implantable Cardioverter Defibrillator (ICD) remains the cornerstone therapy in the management of malignant ventricular arrythmia’s for patients with high risk cardiac conditions. An ICD system contains a battery, capacitors, sensing/ pacing circuit together with an intra-or extra-cardiac lead. All ICD’s have an in-built switch (Reed switch, Hall-effect sensors, Giant magneto sensitive resistors or coils) which respond to an externally applied magnetic field. When an external magnet is applied to a defibrillator, high voltage shock therapy for ventricular tachycardia and ventricular fibrillation is suspended. It has been estimated that a magnetic field stronger than 10 Gauss is strong enough to activate these switches.
Recently, Apple Inc. launched the iPhone 12 series which has a circular array of magnets around a central charging coil for the phone to be compatible with “MagSafe” accessories. MagSafe technology contains a magnetometer and single coil Near Field Communications (NFC) reader. The magnets aids in properly aligning the iPhone on a wireless charger and other peripheral accessories and increases wireless charging speeds (up to 15 Watts). The first author (JG) raised the concerns for possible device-device interaction due to presence of a strong magnetic array in the iPhone and MagSafe compatible cases. We thus tested this interaction on a patient with a Medtronic Inc. (Minneapolis, MN, USA) ICD.
Contemporary studies have shown minimal risk of electromagnetic interference with ICDs and prior smartphones without magnetic arrays.(2
) (3
) A recent case report highlighted magnetic interference with a fitness tracker wrist band deactivating an ICD up to distances of 2.4 cm.
Tomi Engdahl says:
A Teeny Tiny Tea Light with a Neon Bulb
The DIY device runs for nearly a day on LiPo battery and charges wirelessly.
https://www.hackster.io/news/a-teeny-tiny-tea-light-with-a-neon-bulb-adb1b6b691b4
Tomi Engdahl says:
Xiaomi teases over-the-air wireless charging, but it’s not coming to its devices this year
https://techcrunch.com/2021/01/29/xiaomi-teases-over-the-air-wireless-charging-but-its-not-coming-to-its-devices-this-year/?tpcc=ECFB2021
Xiaomi, the world’s third largest smartphone maker, today unveiled “Mi Air Charge Technology” that it says can deliver 5W power to multiple devices “within a radius of several metres” as the Chinese giant invited customers to a “true wireless charging era.”
The company said it has self-developed an isolated charging pile that has five phase interference antennas built-in, which can “accurately detect the location of the smartphone.”
A phase control array composed of 144 antennas transmits millimeter-wide waves directly to the phone through beamforming, the company said, adding that “in the near future” the system will also be able to work with smart watches, bracelets, and other wearable devices.
Tomi Engdahl says:
https://www.electropages.com/blog/2021/02/xiaomi-demonstrates-teaser-wireless-room-charging?utm_campaign=2021-02-09-Latest-Product-News&utm_source=newsletter&utm_medium=email&utm_term=article&utm_content=Xiaomi+Demonstrates+Teaser+for+Wireless+Room+Charging
Tomi Engdahl says:
Xiaomi lataa langattomasti RF-signaalilla
https://etn.fi/index.php?option=com_content&view=article&id=11701&via=n&datum=2021-02-01_15:06:02&mottagare=30929
Tällä hetkellä Xiaomin etälataustekniikka kykenee tarjoamaan yksittäiselle laitteelle 5 watin lataustehon muutaman metrin etäisyydellä. Useita laitteita voidaan ladata samanaikaisesti ja jokaiselle tulee sama noin viiden watin latausteho.
Lähitulevaisuudessa Xiaomin kehittämä langaton lataustekniikka tulee toimimaan älykellojen, rannekkeiden ja muiden puettavien laitteiden kanssa.
Tomi Engdahl says:
Poundland inductive phone charger teardown (with schematic)
https://www.youtube.com/watch?v=5mINaW0VB-E
I think this is a very common style that is available from many sources. The circuitry is very typical of QI chargers. It pulses the output until it gets a response from a compatible device, and then transfers power inductively to the device being charged.
QI devices are notorious for their inefficiency and the need for good alignment for optimal charge transfer. But the huge advantage is the convenience of charging and the lack of wear and damage risk to a traditional charge connector.
The control chip is a mystery. I’ve a sneaky feeling that it’s a 16 pin microcontroller with a bit of clever software to deal with the communication and coil driving via a MOSFET H-bridge.
It will also be determining the type of power source it’s plugged into by measuring USB data line voltage levels.
Tomi Engdahl says:
Nopea NFC-lataaminen tulee kuluttajalaitteisiin
https://etn.fi/index.php?option=com_content&view=article&id=11805&via=n&datum=2021-02-25_15:42:05&mottagare=30929
Langaton lataaminen on kätevää ja siihen on olemassa suosittu Qi-standardi. Sen rinnalle on nousemassa NFC-lataus, joka sopii paremmin pienitehoisten laitteiden lataamiseen.
Eri syistä Qi-tekniikka soveltuu huonosti hyvin pienten tai puettavien laitteiden, kuten fitness-rannekkeiden, langattomien kuulokkeiden tai älylasien lataamiseen. Yksi ilmeisen ihanteellisista vaihtoehdoista on NFC eli teknologia kontaktittomien maksujen ja lipunmyynnin takana. Tämä siksi, että toinen NFC:n ominaispiirteistä on tiedonsiirron ohella energiankeruu eli vastaanottimen (kuuntelijan) kyky generoida energiaa lukulaitteen lähettämästä signaalista.
Tämä tarkoittaa, että kaikkia NFC-yhteensopivia laitteita, joilla on energiankeruukyky, voidaan ladata langattomasti ilman erillistä antennia ja muita komponentteja. Lisäksi langaton NFC-lataus, toisin kuin muut lataustekniikat, ei vaadi laturin ja vastaanottimen antennien täydellistä kohdistusta. NFC-laturi toimii korkealla hyötysuhteella laturipuolella, vaikka jopa puolet antennien koosta olisi väärin asemoitu.
Huolimatta siitä, että NFC löytyy lähes jokaisesta älypuhelimesta – eli ne voisivat toimia latausasemana muille pienemmille laitteille – NFC-lataus on toteutettu vain harvoissa pienissä laitteissa. Tämä johtuu siitä, että lähettimen teho – tyypillisesti 1 W ja 1,5 W antennissa – rajoittaa mahdollisuuden ladata laitteita, joilla on suurempi akun kapasiteetti tai pienempi NFC-antenni.
Tomi Engdahl says:
https://etn.fi/index.php/13-news/11857-langaton-laturi-ilman-johtoja
Tomi Engdahl says:
Superconducting Coil Pushes Wireless Power Out at Over 5kW — But Keeping It Cool Is a Challenge
Clever coil system shows promise for robotics, healthcare, and even electric vehicles — if you can keep it at a chilly -321°F.
https://www.hackster.io/news/superconducting-coil-pushes-wireless-power-out-at-over-5kw-but-keeping-it-cool-is-a-challenge-9cfa9c3a6d84
Tomi Engdahl says:
Kinda cool but only six microwatts.
this energy-harvesting card can turn 5G networks into wireless power grids
https://www.designboom.com/technology/energy-harvesting-card-turn-5g-networks-wireless-power-grid-03-29-2021/
a group of researchers at the georgia institute of technology have unveiled a new way to tap into the over-capacity of 5G networks — they have turned them into a wireless power grid that can power IoT devices that currently need batteries to operate. the result is a flexible rotman lens-based rectifying antenna (rectenna) system capable, for the first time, of millimeter-wave harvesting in the 28-GHz band.
people have attempted to do energy harvesting at high frequencies like 24 or 35 gigahertz before,’ eid continued, but such antennas only worked if they had line of sight to the 5G base station; there was no way to increase their angle of coverage until now.
operating just like an optical lens, the rotman lens provides six fields of view simultaneously in a pattern shaped like a spider. tuning the shape of the lens results in a structure with one angle of curvature on the beam-port side and another on the antenna side. this enables the structure to map a set of selected radiation directions to an associated set of beam-ports. the lens is then used as an intermediate component between the receiving antennas and the rectifiers for 5G energy harvesting.
Tomi Engdahl says:
Nopea langaton lataus keskiluokan 5G-puhelimiin
https://etn.fi/index.php/13-news/12068-nopea-langaton-lataus-keskiluokan-5g-puhelimiin
Qualcomm aikoo tuoda 30 watin langattoman latauksen keskihintaluokan 5G-puhelimiinsa. Sen Snapdragon 750G -sarjan 5G-alustan kylkeen ollaan tuomassa Renesasin P9412-vastaanotinta, jolla 30 watin lataus onnistuu.
Valmiin integroidun alustan myötä laitevalmistajien on helpompi toteuttaa langaton lataus laitteissaan. Renesasin piiri on valmiiksi sertifioitu Qi-standardin mukaisesti.
P9412-vastaanotin on markkinoiden ensimmäinen 30 watin Qi-vastaanotin, jossa on suurijännitteinen integroitu kondensaattorijakain. Tämä tuo Qi-vastaanottoon erittäin hyvän hyötysuhteen samalla, kun latauspiiristön koko kutistuu 40 prosenttia aiempiin ratkaisuihin verrattuna.
Tomi Engdahl says:
Sam Byford / The Verge:
Xiaomi demos fully charging a 4,000mAh battery in eight minutes over a 200W “HyperCharge” system or in 15 minutes with 120W wireless charging
Xiaomi says it can now fully charge a phone in eight minutes at 200W
New ‘world records’ in wired and wireless charging
https://www.theverge.com/2021/5/30/22461435/xiaomi-fast-charging-world-record-200w-wired-120w-wireless?scrolla=5eb6d68b7fedc32c19ef33b4
Xiaomi has shown off its latest fast charging tech demo, and consequently is claiming the new world records for both wired and wireless charging speeds. Using a modified Mi 11 Pro with a 4,000mAh battery, Xiaomi says it’s able to fully charge the phone in 8 minutes over a 200W wired “HyperCharge” system, or in 15 minutes with 120W wireless charging.
Charging speeds are a frequent battleground for Chinese smartphone companies, who often release demonstrations of breakthroughs that may or may not show up in final products. Two years ago, for example, Xiaomi announced a 100W system that could charge a 4,000mAh battery in 17 minutes, while last year’s Mi 10 Ultra filled up in 23 minutes at 120W — though it did have a bigger 4,500mAh battery.
Oppo announces 125W tech that charges phones in 20 minutes
And the world’s fastest wireless charging
https://www.theverge.com/2020/7/15/21325289/oppo-125w-fast-charging-65w-airvooc-wireless-charger
Tomi Engdahl says:
Uusi tekniikka mullistaa langattoman lataamisen
https://etn.fi/index.php/13-news/12230-uusi-tekniikka-mullistaa-langattoman-lataamisen
Italialainen Eggtronic on esitellyt langattoman lataustekniikan, joka tekee nykyisestä Qi-standardista kerralla vanhentunutta. Patentoitu E2WATT-lataus tukee jopa 300 watin tehoa eli sillä voidaan ladata langattomasti myös jopa kodinkoneita ja muita suurempia laitteita. Eggtronicin roadmapissa puhutaan jopa sähköajoneuvoista.
Lataustekniikoista Qi-standardi on markkinoiden kiistaton valtias, mutta sillä on omat rajoituksena. Ladattava laite täytyy olla enimmillään 5 millimetrin päässä alustasta eli käytännössä sen pitää maata alustan päällä. Qi:n tyypillinen latausteho on rajoitettu 30 wattiin, tosin yritykset ovat kiertäneet tätä rajoitusta käyttämällä useampia käämejä.
E2WATT on vaihtovirtahybridi-tekniikkaa eli se saa virran suoraan verkkovirrasta ilman erillistä virtalähdettä. Yksivaiheinen hybridisuunnittelu minimoi häviöt verrattuna perinteisiin kaksivaiheisiin langattomiin tekniikoihin. Näin päästää hulppeaan 95 prosentin hyötysuhteeseen.
Latauslähetin on suunniteltu Microchipin dsPIC33-ohjaimen ympärille. Siinä on tehokas DSP-ydin, nopeat AD-muuntimet ja korkean resoluution PWM-osat, joiden avulla latauksen etäisyyttä on voitu kasvattaa.
Eggtronic ei ole vielä kertonut, millä aikataululla E2WATT-lataus olisi tulossa kaupallisesti tarjolle.
E2WATT gives a boost to wireless charging capabilities
https://www.newelectronics.co.uk/electronics-news/e2watt-gives-a-boost-to-wireless-charging-capabilities/237714/
Eggtronic, a developer of power electronics, has announced E2WATT, an AC power technology that will help to boost the power, efficiency, charging distance and data transmission capabilities of wireless charging applications.
Traditional Qi wireless power is limited by distance (usually 5 mm), and maximum power (usually up to 30 W), however E2WATT technology is capable of reaching up to eight times further (to 40 mm) and can deliver up to 300 W – a significant breakthrough for inductive standards.
The E2WATT wireless technology is powered directly from AC mains, without the need for an external power supply. The single-stage hybrid design minimises losses compared with conventional double-stage wireless technologies to deliver significantly increased peak efficiencies of up to 95%.
“The performance of E2WATT is enabled by the high-speed gallium nitride – or GaN – semiconductor technology used in GaNFast power ICs,” added Stephen Oliver, VP Corporate Marketing at Navitas Semiconductor. “The Eggtronic team realised the limitations of legacy silicon chips and early discrete GaN with complex circuits and many discrete components. GaNFast power ICs are easy-to-use, ‘digital-in, power-out’ circuit building blocks which meant the expert team in Modena could focus on their proprietary, high-speed E2WATT topology and achieve a very fast time to market.”
“This is a hybrid AC wireless power solution which is both a power supply and a wireless charger, able to increase efficiency, power, distance, and reduce both size and complexity,” said Matteo Ovi, Head of B2B Sales at Eggtronic. “We can expand into new segments and products that were not possible before.”
Tomi Engdahl says:
https://hackaday.com/2021/06/20/19-coils-make-charging-wireless/
Tomi Engdahl says:
Sähköautoon 200 kilowatin lataus langattomasti
https://etn.fi/index.php?option=com_content&view=article&id=12381&via=n&datum=2021-07-30_14:10:39&mottagare=31202
Sähköauton akuston lataaminen on tällä hetkellä suurin sähköautoilua hidastava tekijä. Saksalainen Tesvolt on esitellyt ongelmaan uuden ratkaisun: induktiivisen langattoman lataamisen, joka voisi syöttää akkuun virtaa ajon aikana tienpinnasta 200 kilowatin teholla.
Langaton lataus tarkoittaa sähköenergian siirtämistä induktiivisessa, toisin sanoen kontaktittomassa prosessissa lattiassa tai lattialla olevasta magneettikäämisestä sähköajoneuvon vastaanottokäämin. Tämä mahdollistaa monia lyhyitä mutta nopeita latausprosesseja – esimerkiksi kauppakeskusten pihapiireillä, monikerroksisissa pysäköintialueissa sekä kotona. Autonvalmistajat, kuten Audi ja BMW, asentavat jo latauskäämiä uusiin automalleihin.
Toistaiseksi ainoa sarjatuotantoon sopiva langaton lataus on vain teholtaan vain 3,2 kilowattia ei käytännössä lataus onnistuu samalla nopeudella kuin normaalissa suomalaisessa kodin sähköverkossa.
Tesvolt haluaa tuoda markkinoille induktiivisen latausaseman, jonka latausteho on 44 kilowattia. Nykyisiin ratkaisuihin verrattuna lataaminen onnistuisi siis 14 kertaa nopeammin. Ratkaisu perustuu piikarbiditehopuolijohteisiin, jossa hyötysuhde on 95 prosenttia
Induktiivisella latauksella on vielä monia haasteita. Esimerkiksi langattoman latauksen maksamista ei ole ratkaistu. Ja sovellettava DIN-standardi 61980-1, joka määrittelee sähköajoneuvojen langattomat voimansiirtojärjestelmät, on edelleen kehitysvaiheessa.
Tomi Engdahl says:
How to make the world’s easiest Radio ! Do it yourself at home!
https://www.youtube.com/watch?v=w18z059DzOU
In today’s video, I will show you great ideas on how you can do it yourself at home The simplest radio emitter AND receiver. This is the simplest example for children about how radio waves transmit signals.
Tomi Engdahl says:
NFC-lataus nopeasti laitteisiin
https://etn.fi/index.php/13-news/12473-nfc-lataus-nopeasti-laitteisiin#ETNartikel
Itävaltalainen Panthronics yrittää ajaa NFC-lataamista pieniin elektroniikkalaitteisiin. Yhtiön piireillä päästään parhaimmillaan NFC-linkissä 2,5 watin tehoon. Nyt esitelty uusi referenssimalli nopeuttaa tekniikan tuomista kaupallisiin laitteisiin.
Panthronicsin langattomaan PTX100W NFC -latausohjaimeen perustuva järjestelmä voi toimittaa jopa 1 W sähkövirran akulle. Tämä on kaksinkertainen suorituskyky verrattuna seuraavaksi parhaiten kilpailevaan tuotteeseen.
Referenssimallin avulla laitevalmistajat voivat nopeasti tuoda markkinoilla esimerkiksi nappikuulokkeet, älykellon, aktiivisuusrannekkeen tai älylasit, joiden lataaminen onnistuu NFC-radion yli. Latausjärjestelmä pitää sisällään PTX100W-pohjaisen pollerin eli latausaseman ja kuuntelijan, jossa on tavallinen NFC -tunniste.