Rezence (wireless charging standard)

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Alliance for Wireless Power (A4WP)
Official Rezence logo, representing the wireless charging standard and the Alliance for Wireless Power (A4WP)
First published2012; 11 years ago (2012)
OrganizationAlliance for Wireless Power
LicenseOpen standard
CopyrightLogo and trademark
Official Rezence brandmark, the A4WP uses this mark of interoperability to show that various devices are compatible with Rezence systems.

Rezence (pronounced reh-zense) was an interface standard developed by the Alliance for Wireless Power (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]

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[edit]


  1. ^ "Alliance for Wireless Power (A4WP) Announces the Expansion of the Rezence™ Standard to 50 Watts to Include Tablets, PCs and Peripherals". MarketWatch. PR Newswire.
  2. ^ "A4WP Rezence Wireless Power". YouTube.
  3. ^ "Rezence Technical Specification".
  4. ^ "Bluetooth Based Wireless Charging – Rezence (A4WP)". Wireless Outlook.
  5. ^ "A4WP Board Members". Rezence.
  6. ^ "IDT Joins the Alliance for Wireless Power to Assist in Propagation of Innovative Wireless Power Solutions".
  7. ^ "Intel joins Alliance for Wireless Power's Board of Directors". Engadget.
  8. ^ "Intel joins A4WP, a newcomer to wireless power standards". Cnet.
  9. ^ "Samsung, Qualcomm start up Alliance for Wireless Power to take on Qi". Engadget.
  10. ^ "WiTricity Joins Alliance for Wireless Power (A4WP)". Yahoo Finance.
  11. ^ "Alliance for Wireless Power and Power Matters Alliance Agree to Merge" (Press release). Retrieved 25 August 2023.

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