| Rezence | |
|---|---|
 Official Rezence logo, representing the wireless charging standard and the Alliance for Wireless Power (A4WP) | |
| First published | 2012 |
| Organization | WiPower |
| License | Open standard |
| Copyright | Logo and trademark |
| Website | rezence |
Rezence (pronounced reh-zense) was an interface standard developed by the WiPower (A4WP) for wireless electrical power transfer based on the principles of magnetic resonance. The Rezence system consisted of a single power transmitter unit (PTU) and one or more power receiver units (PRUs). The interface standard supported power transfer up to 50 watts, [1] at distances up to 5 centimeters. [2] The power transmission frequency is 6.78 MHz, and up to eight devices could be powered from a single PTU depending on transmitter and receiver geometry and power levels. A Bluetooth Low Energy link was defined in the A4WP system intended for control of power levels, identification of valid loads and protection of non-compliant devices. [3] [4]
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The A4WP was formed in early 2012 with the intent to create a wireless power transfer standard to compete with the existing Qi standard. Board member companies [5] included Broadcom, Gill Electronics, Integrated Device Technology (IDT), [6] Intel, [7] [8] Qualcomm, Samsung Electronics, [9] Samsung Electro-Mechanics, and WiTricity. [10]
In January 2015 A4WP and the Power Matters Alliance announced that the two organizations intended to merge into the AirFuel Alliance. [11]