Updated Qi 1.2 standard makes wireless charging more wireless


The Qi-compatible Nexus 5 on the Nexus Wireless Charger. New chargers will be able to increase the space between the device and the pad. Andrew Cunningham The Wireless Power Consortium’s Qi wireless charging standard is wireless in that the phone is not physically plugged into anything, but it still requires your device and the wireless charging pad to be touching each other to work. Today, the WPC announced ( PDF ) that version 1.2 of the Qi standard will add support for resonant charging, making it possible for your phone to be charged when near a Qi pad rather than directly on top of it. A small image showing Qi 1.2 in action. WPC It’s a minor enough change that current Qi 1.1 receivers will be able to take advantage of it with no extra hardware, but it opens up a few different possibilities for companies that want to build Qi support into their products. The WPC says that Qi chargers can now be embedded within tables and desks rather than placed on the surface, making them less obtrusive. “New low power transmitter designs” will make it easier to build Qi chargers into cars, and a single Qi 1.2 transmitter will be able to charge multiple Qi devices simultaneously.  Qi can also now supply up to 2,000 watts of power to household appliances (the release specifically mentions “kitchen applications”). Current Qi devices will be able to draw power from these new transmitters at distances of up to 30 mm (around 1.2 inches), while devices with purpose-build Qi 1.2 receivers increase the distance to 45 mm (about 1.8 inches). Engadget reports that the resonant version of Qi is roughly 70 to 80 percent efficient, while the old inductive version is around 85 percent efficient, and Qi 1.1 and 1.2 transmitters and receivers will be able to interoperate, so inductive charging pads like the Nexus Wireless Charger will still be able to charge Qi 1.2 phones. Just know that resonant charging will require a Qi 1.2 transmitter. Read 1 remaining paragraphs | Comments

Updated Qi 1.2 standard makes wireless charging more wireless


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