Rezence (wireless charging standard)

{{Use dmy dates|date=August 2023}}

{{Infobox technology standard

| title = Rezence

| image = Rezence_logo,_wireless_charging_standard.png

| image_size = 220

| alt = Alliance for Wireless Power (A4WP)

| caption = Official Rezence logo, representing the wireless charging standard and the Alliance for Wireless Power (A4WP)

| first_published = {{start date and age|2012}}

| organization = WiPower

| license = Open standard

| copyright = Logo and trademark

| website = {{URL|rezence.com}} {{URL|rezence.com/vn88}} {{URL|rezence.com/me88/}}

}}

File:Rezence Z icon logo.png

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,{{cite news|title=Alliance for Wireless Power (A4WP) Announces the Expansion of the Rezence™ Standard to 50 Watts to Include Tablets, PCs and Peripherals|url=http://www.marketwatch.com/story/alliance-for-wireless-power-a4wp-announces-the-expansion-of-the-rezence-standard-to-50-watts-to-include-tablets-pcs-and-peripherals-2014-06-04|work=MarketWatch|agency=PR Newswire}} at distances up to 5 centimeters.{{cite web|title=A4WP Rezence Wireless Power|url=https://www.youtube.com/watch?v=oseV55j1g3w|website=YouTube| date=9 January 2014 }} 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.{{cite web|title=Rezence Technical Specification|url=http://www.rezence.com/technology/technical-specification|website=Rezence.com}}{{cite web|title=Bluetooth Based Wireless Charging – Rezence (A4WP)|url=http://www.wirelessoutlook.com/technology/bluetooth-based-wireless-charging-rezence-a4wp/|website=Wireless Outlook}}

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{{cite web|title=A4WP Board Members|url=http://www.rezence.com/alliance/board-of-directors|website=Rezence}} included Broadcom, Gill Electronics, Integrated Device Technology (IDT),{{cite web|title=IDT Joins the Alliance for Wireless Power to Assist in Propagation of Innovative Wireless Power Solutions|url=http://www.idt.com/about/press-room/idt-joins-alliance-wireless-power-assist-propagation-innovative-wireless-power-solutions|website=IDT.com}} Intel,{{cite web|title=Intel joins Alliance for Wireless Power's Board of Directors|url=https://www.engadget.com/2013/06/19/intel-joins-a4wp/|website=Engadget|date=19 June 2013 }}{{cite web|title=Intel joins A4WP, a newcomer to wireless power standards|url=http://www.cnet.com/news/intel-joins-a4wp-a-newcomer-to-wireless-power-standards/|website=Cnet}} Qualcomm, Samsung Electronics,{{cite web|title=Samsung, Qualcomm start up Alliance for Wireless Power to take on Qi|url=https://www.engadget.com/2012/05/08/samsung-qualcomm-start-alliance-for-wireless-power/|website=Engadget|date=8 May 2012 }} Samsung Electro-Mechanics, and WiTricity.{{cite web|title=WiTricity Joins Alliance for Wireless Power (A4WP)|url=https://finance.yahoo.com/news/witricity-joins-alliance-wireless-power-131500954.html|website=Yahoo Finance}}

In January 2015 A4WP and the Power Matters Alliance announced that the two organizations intended to merge into the AirFuel Alliance.{{cite press release |language=en |access-date=25 August 2023 |title=Alliance for Wireless Power and Power Matters Alliance Agree to Merge |url=https://web.archive.org/web/20150108235722if_/http://www.rezence.com:80/media/news/alliance-wireless-power-and-power-matters-alliance-agree-merge}}