The state of wi-fi charging: 2018 and past

Whereas wi-fi charging pads have turn out to be extra commonplace over the previous 12 months or so – spurred on by Apple's launch of its iPhone eight and X traces and the corporate's upcoming AirPower wi-fi charger – the way forward for wi-fi charging should be up within the air.

The flexibility to cost {hardware} over distances of a number of meters has at all times appeared simply across the nook, even when firms first introduced the expertise years in the past. Now, nevertheless, a number of the firms behind wi-fi charging have introduced partnerships with electronics trade stalwarts, paving the best way for precise product shipments.

Israel-based Wi-Cost plans to unveil the names of its first vendor companions, who'll be integrating the expertise into their merchandise, on the Cellular World Convention Americas Sept. 12-14 in Los Angeles.

As soon as the corporate begins licensing its expertise, which makes use of infrared beams to transmit energy, merchandise ought to ship quickly after – probably early in 2019, in line with Yuval Boger, Wi-Cost's chief advertising officer.

Final 12 months, Wi-Cost received approval from the Food and Drug Administration for its technology.

The infrared beams Wi-Charge uses can send power (by line of sight) from a charging hotspot that looks like a Wi-Fi router to devices within a 15-foot range; while the company claims it can transmit up to 10 meters, charging efficiency is reduced as  distance grows. The Wi-Charge hotspot can mount on a wall or ceiling and cover an average sized room, so devices can recharge automatically.

The company sees its market not only in charging mobile products, but also in IoT devices, such as smart building temperature and HVAC monitors and fire alarms; the advantage is that IoT devices no longer need to be hard wired for power.

A single Wi-Charge transmitter can send up to 3 watts of power to devices, such as a smartphone or laptop or less than 1 watt for an IoT device. The company has already developed a small dongle that plugs into an Android smart phone and allows it to wirelessly charge.

"We can deliver much more power, enough to charge a phone, at a much greater distance. When we deliver infrared light, we can deliver a really narrow, focused beam," Boger said. "It means if you have a small receiver...you can deliver all the energy coming from that transmitter into that receiver. So, you have very high efficiency and can deliver a lot of energy.

"In contrast, when you use radio frequency waves, they diverge. That's really good when you're doing radio transmission because you want all the stations in your neighborhood to get that, but it's really bad when you do wireless power," Boger continued. "That small receiver will capture a tiny, tiny fraction of the power."

The safety limits for RF energy are also lower, Boger argued. "We can deliver several watts of power at 15 feet," he said.

The price of a Wi-Charge smartphone dongle could run around $10, Boger said, and while he couldn't say what the retail price for a Wi-Charge hotspot might be, its parts will cost about $100.

"Today we have two models, one that focuses more on IoT devices. This could be smart home devices, this could be sensors on smart buildings...or, for instance a smart door lock. This technology can replace batteries and, of course, it can replace power cords," Boger said. He added that wireless speakers could get both music through Bluetooth transmissions and power via the infrared transmitter.

The company's other transmitter is aimed more at mobile use, offering several watts of power from up to 15 feet away.

Another wireless charging-at-distance firm, Ossia, has partnered with with electronics manufacturer Molex to boost development of its first products, which should be available this year. And, even before it's shipped a single charger, Ossia this month announced improvements to its firmware that increase the amount power devices can get from its transmitter by 50%.

Ossia's Cota technology uses radio frequency (RF) to send power and data over distances greater than 15 feet. Cota Transmitters can link to charge dozens of mobile devices within a several-meter radius, and the transmitters come in multiple form factors, including a drop ceiling tile.

By linking two Cota ceiling tiles, the system can power mobile devices in a typical coffee shop, office or other crowded space, the company claims. It has also developed AA batteries that can receive a wireless charge.

A Cota ceiling tile power transmitter from Ossia.

Ossia announced that the Cota Real Wireless Power system will soon be available in the 5.8 GHz ISM band, a higher frequency that will allow for more targeted delivery of power. It did not disclose how much it will be able to transmit, though past iterations have been around half a watt.

"Let's say I'm in an office for eight to 10 hours a day and I'm receiving a half a watt or a watt of power; it's charging my device all the time," Ossia CEO Mario Obeidat said in an earlier interview. "So if it takes five hours to fully charge that device, that's fine because you're there all the time."

An Ossia competitor, Energous, received FCC approval in December when the agency certified the company's WattUp Near Field transmitter. Like today's popular charging pads, it enables contact-based, fast-charging capabilities for mobile devices such as smartphones and fitness bands.

Michael Leabman, founder and CTO of Energous, demonstrates how one of the company's wireless charging routers can send power at midrange and far-range distances.

Like Ossia, Energous has partnered with a large electronics manufacturer, Dialog Semiconductor, to help it distribute its technology.

"I've used both ; the technology works," Rob Rueckert, the managing director at Sorenson Capital, a private equity and venture capital firm, said in an earlier interview with Computerworld.

Rueckert believes charging at distance is a more compelling technology than charging pads or even boxes that still require a mobile device to be relatively tightly connected to a charging source.

Ossia, Energous and another charging-at-distance company, uBeam, all demonstrated uncoupled charging technology at CES earlier this year. UBeam uses ultrasound to transmit energy to receivers.

Unlike today's most popular wireless chargers, which require devices to rest on a charging pad, Ossia is among several companies developing trickle-charging capability that can send power through walls or simply top off a device when you enter a room.

Cota's AA wirelessly rechargeable AA battery.

Unlike trickle-charging, Wi-Charge hot spots offer a significant power boost that could fully charge a depleted Android smartphone in about three hours, according to Boger.

One potential obstacle to adoption of wireless charging at distance is that neither Ossia's nor Energous' can charge Qi-enabled devices; the technology is proprietary.

Wi-Charge, however, has developed a Qi-enabled charging pad that doesn't need to be plugged in; it receives its power via an internal battery that is charged via the wireless hotspot. Essentially, the Wi-Charge hotspot is charging the wireless charger, which in turn, charges the smartphone or other Qi-enabled devices.

"The receiver has a photovoltaic cell. It's like a little solar cell. The transmitter searches in the room for devices it can power and once it finds that device, it sends a really thin, very focused beam of invisible, infrared light and delivers that power," Boger said.

While a device being charged through the infrared beam can be moved and still receive power, once something cuts off the infrared beam, charging stops until the line of sight is restored.

Apple, too, has dipped its toes into the arena of more loosely-coupled wireless charging technology.

A month after announcing the AirPower charger, Apple purchased New Zealand-based PowerByProxi, whose wireless charging technology can send power to multiple devices, from headphones to remote controls. PowerByProxy makes a number of charging device form factors, including a box into which multiple items can be dropped to charge.

Apple settled on the Qi wireless charging specification for its mobile device, from its smartphones to the Apple Watch and its wirelessly chargeable AirPod ear buds.

It remains unclear what it may do with PowerByProxi's intellectual property.