For Its Next Trick, Motorola Is Working On Smartphones That Can Charge Wirelessly Over the Air

Motorola’s next batch of devices might feature a new remote wireless charging ability.
Motorola’s next batch of devices might feature a new remote wireless charging ability.
Photo: Sam Rutherford/Gizmodo

They haven’t all been home runs, but Motorola is known for taking chances. The company has repeatedly shown it’s not afraid to bet on new technology, from the recently phased-out Moto Mods back to the first wafer-thin Razr feature phones. Now, Motorola is trying its hand at remote wireless charging for smartphones by partnering up with former CalTech engineers. Many have tried, but no company has made over-the-air charging a widespread thing. So why not try again?

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The concept behind remote wireless charging is basically the same as wifi and mesh networking, though within a smaller scope. Instead of physically placing your smartphone atop a specified charging plate, you can walk into the range of the charger’s connection to start charging your phone.

GuRu, the company partnering with Motorola on the charging standard, is named after its hardware requirements. “Gu” stands for the generator unit, which is, in this case, a ceiling-mounted power generator. “Ru” stands for receiving unit, referring to the bite-sized receiving chip built into the smartphone. GuRu uses millimeter-wave frequency—the same kind that enables ultra-fast, short-range 5G networks—to transmit the wireless charging signal.

According to ZDNet’s deep dive into how GuRu’s over-the-air wireless charging technology works:

Instead of using one huge power transmitter, which blasts waves of energy in all directions, GuRu’s solution uses a small transmitter made up of interconnected modules that use millimeter-waves (mmWave), a radio frequency typically defined in the 30GHz to 300GHz range that works within line-of-sight. (MmWave is also used by the current 5G standard to send data at extremely high speed over relatively short distances compared to the Sub-6 GHz 5G tech.)

Because GuRu is using millimeter-wave frequencies and smart algorithms, its transmitters and receivers can be miniaturized, and it allows it to better direct and confine the EM waves compared to waves in the higher microwave bands — the very same wavelengths where Wi-Fi and Bluetooth are operating.

GuRu told ZDNet that the generator could concurrently track and transmit to multiple receivers within distances exceeding 30 feet regardless of the device’s wattage requirement. And since it’s scalable, GuRu’s wireless technology could be used to power up everything from earbuds, headphones, smartwatches, and even laptops and tablets, as well as charging multiple devices concurrently. Imagine Motorola hinging an entire lineup of accessories for its smartphones on this wireless charging specification—like Moto Mods but useful.

The concept of charging a smartphone by simply walking into a room is pretty neat. Seeing it come to fruition is another thing entirely, as most of the time, remote wireless charging is nothing more than a “tantalizing tech demo,” to borrow a phrase from Gizmodo’s Andrew Liszewski. Overseas Android favorites Xiaomi and Oppo, are pushing through their versions of the technology, with Oppo’s Wireless Air Charging being the most competitive. But unlike GuRu’s implementation, Oppo’s technology is limited to charging devices from a mere four inches away.

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GuRu’s remote wireless charging specification could be the sort of thing that helps Motorola recapture the smartphone spotlight. With Lenovo at the helm, Motorola is clearly willing to take risks. Wireless charging has become the default for flagship smartphones, and GuRu’s implementation would take a Motorola phone to the next level.

DISCUSSION

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Arai-the fly on the wall

Among all the conveniences, how effective is wireless charging vs wired?

How much power output are lost to heat between the two?

And how is this new tech fared to the previous one?