While Apple has yet to bring native wireless charging to its lineup of iOS mobile devices, vendors at International CES were out in force this week claiming to have the first chargers for the iPhone 5, iPhone 4 and 4S models.
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ConvenientPower created a sleeve based on the Qi standard (pronounced "chee") for both the iPhone 5 and iPhone 4 models. WiTricity created a sleeve for the iPhone 5 only.
The Wireless Power Consortium (WPC) also announced a next generation of its Qi charging standard that allows multiple devices to be charged on a pad as well as charged through solid objects, such as a tabletop.
Previously, the Qi wireless charging standard used "tightly" coupled inductive charging, which required enabled mobile devices to be placed in a specific space on a charging pad. The device could not be moved once charging began.
For consumers, the new Qi "resonant extension" will allow more loosely coupled charging with higher efficiency and at a lower radio frequency interference, which means it will be possible to charge without worrying about the exact position of their devices so they can charge anywhere.
The WPC demonstrated examples of the new magnetic resonance extension technology with products from ConvenientPower and PowerbyProxi along with the newest Qi-compatible wireless charging products and prototypes from Devant, Haier, Leggett & Platt, Nokia, Samsung, Texas Instruments and others.
Texas Instruments is supplying the chip technology that regulates the Qi wireless power and makes the electronic "handshake" between pad and mobile device.
There are now more than 400 Qi-enabled devices, including mobile phones, such as the Samsung Galaxy S4 and S3, Nokia Lumia 1020, LG G2, Motorola Droid Maxx and Mini and the Google Nexus 5 phone and Nexus 7 tablet.
John Perzow, vice president of market development for the WPC, demonstrated how the new pads could charge multiple mobile devices. He then held the charging pad under a table and placed an enabled smartphone on the table top. The phone began to charge.
WPC's magnetic resonant charging allows power to travel about 18mm, or about three-quarters of an inch. However, the efficiency of the charge is reduced to about 65 percent, Perzow said.
The extension to the Qi standard is backward compatible to the 1.1 specification, meaning about 40 million Qi-enabled mobile devices that are already in the hands of consumers can use the new charging pads, Perzow said.
Wireless charging company WiTricity demonstrates a new power charging device that can recharge multiple iPhone 5 units without needing a specific charging location.
WiTricity's CEO Eric Giler scoffed at WPC's claims of resonance charging.
"They're saying that [they have resonance] because of us," Giler said. "WiTricity invented resonance charging," he said.
Jeep Cherokees this year will have the option of an armrest that can wirelessly charge an enabled mobile device using the new extension to the Qi specification.
WiTricity's magnetic resonance charging also allows multiple devices to be placed on a pad. Its technology also allows voltage to pass through solid objects to charge a smartphone or other enabled device.
WiTricity's resonance charging can efficiently charge devices through solid objects that are about an inch thick, Giler said. Even while charging through a one-inch thick object, such as a table, WiTricity retains about 90 percent efficiency, Giler said.
While WiTricity typically builds prototypes of its chargers and power receivers, this time the company decided to go into production with its own iPhone 5 wireless sleeves and charging pads.
The company will sell the charging pad and the iPhone 5 sleeve, for $99. An additional iPhone 5 sleeve will cost $49.
"The purpose of this is not to make money, but to put the technology into people's hands," Giler said, adding that, ultimately, he expects other equipment manufacturers to produce wireless charging products using his company's specifications.
A charging device by Samsung using the Qi specification. The pad can be charged wirelessly on another charging pad, and then carried to wirelessly charge a smartphone
The Qi iPhone sleeves will sell for $10 to $20 on sites such as Amazon.com and the charging pads will sell for about $40, according to Steve Coacher, business development manager for Texas Instrument's wireless power products.
WPC member PowerbyProxi on Tuesday announced it has signed a technology licensing agreement with Texas Instruments to use its embedded processors. Texas Instruments, in turn, will leverage PowerbyProxi's resonant and closely coupled wireless power to add new products to its portfolio.
Lucas Mearian covers consumer data storage, consumerization of IT, mobile device management, renewable energy, telematics/car tech and entertainment tech for Computerworld. Follow Lucas on Twitter at @lucasmearian or subscribe to Lucas's RSS feed. His e-mail address is firstname.lastname@example.org.
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This story, "Vendors demo wireless charging for iPhones" was originally published by Computerworld .