Rezence (wireless charging standard)

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Official Rezence logo, representing the wireless charging standard and the Alliance for Wireless Power (A4WP)
Official Rezence brandmark, the A4WP uses this mark of interoperability to show that various devices are compatible with Rezence systems.

Rezence (pronounced reh-zense) is 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 consists of a single power transmitter unit (PTU) and one or more power receiver units (PRUs). The interface standard supports 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 can be powered from a single PTU depending on transmitter and receiver geometry and power levels. A Bluetooth Low Energy link is 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] include Broadcom, Gill Electronics, Integrated Device Technology (IDT),[6] Intel,[7][8] Qualcomm, Samsung Electronics,[9] Samsung Electro-Mechanics, and WiTricity.[10]


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. ^ "Winergy Wireless Charger Reviews 2022: Exclusive Report". Review Ecstasy.

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