Rezence (wireless charging standard)

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]

Rezence

Official Rezence logo, representing the wireless charging standard and the Alliance for Wireless Power (A4WP)
First published	2012; 13 years ago (2012)
Organization	WiPower
License	Open standard
Copyright	Logo and trademark
Website	rezence.com rezence.com/vn88 rezence.com/me88/

Official Rezence brandmark, the A4WP uses this mark of interoperability to show that various devices are compatible with Rezence systems.

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]

See also

• Cordless
• WiPower
• Contactless energy transfer
• Inductive coupling
• Near field communication
• Bluetooth Smart
• Open Dots, a conductive charging standard promoted by Open Dots Alliance