Categories: MobilityWorkspace

Microsoft Issues Wireless Charging Pad Patent

Microsoft issued a patent application on 18 Feb. describing a wireless charging pad for portable devices, in a hint of what the company could be thinking as it moves more aggressively into both the smartphone and tablet PC space.

“A charging device as described herein can utilize a sensor-integrated resonating circuit with automatic frequency control to prove low-cost inductive charging functionality for electronic devices,” reads the patent’s abstract. “Further, a charging device as described herein can have an inductive charging surface as well as a non-charging surface for providing other services such as information display.”

In essence, the patent sets out to solve what it describes as a particular issue: “Wireless charging techniques typically provide low efficiency and slow charging speeds as compared to comparable wired charging solutions.” In addition, such devices are also expensive and require a form-factor too large to easily “fit inside a portable device.”

Other manufacturers have been dipping their toes into the wireless-charging space. In May 2009, Palm announced that the Pre would debut with a wireless charging pad dubbed the “Touchstone,” which utilised electromagnetic induction to power devices and retailed for $69.99 (£45.33).

Nokia researchers have also been reportedly experimenting with ways to charge mobile and wireless devices, aiming to eventually create a device that collects up to 50 milliwatts of power, enough to charge a cell phone that has been turned off. However, those researchers also suggested that such technology could potentially be years away from mainstream manufacture.

Microsoft’s patent describes a device capable of efficiently charging other electronics via “a sensor-integrated resonating circuit with automatic frequency control to provide low-cost inductive charging functionality for electronic devices”. In theory, that would make the device as efficient and speedy as its cord-equipped equivalent.

A wireless charging pad could potentially dovetail with other rumored areas of Microsoft research. According to a recent report by Northeast Securities analyst Ashok Kumar, Microsoft could release a branded smartphone running its new mobile operating system, Windows Phone 7 Series, at some point in 2011; even if that rumor never pans out, other whispers about Microsoft developing a branded device under the umbrella of “Project Pink” have been circulating for some time. As Palm demonstrated with the Pre, there is utility for a wireless charger.

Microsoft has also been moving with hardware partners such as Hewlett-Packard to introduce a series of tablet PCs running Windows 7 throughout 2010 and into 2011. Those tablets would function as both multimedia devices and e-readers, and compete against Apple’s upcoming iPad tablet. Microsoft CEO Steve Ballmer unveiled three tablets, including HP’s “Slate,” during his 6 Jan. keynote address at the Consumer Electronics Show (CES) in Las Vegas.

A charging pad, particularly one with a screen, could become a vital accessory for future tablet PCs, as well. As with many patents filed by tech companies, though, the document could more represent an attempt to lock down an idea than a genuine research initiative.

Nicholas Kolakowski eWEEK USA 2013. Ziff Davis Enterprise Inc. All Rights Reserved.

View Comments

  • Thank god China is fast becoming the world superpower and these soon to be useless US patents, which have twisted and blighted the IT landscape will finally be consigned to the dustbin, and not a moment too soon.

  • I don't know if I feel comfortable with putting more brain cooking wave into the air, its already bad enough that I have a microwave generating device that sits in my pocket 3in from my manhood.

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Published by
Nicholas Kolakowski eWEEK USA 2013. Ziff Davis Enterprise Inc. All Rights Reserved.
Tags: Wireless

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