Get the specs on Qi

Download the latest Qi specification

Want a deeper understanding of the latest Qi low power specification? Click below and fill out the form to gain access to more details about the inner workings of Qi wireless charging.

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Test specs for members only

Are you already a member of the Wireless Power Consortium? Click below to get full details on performance requirements and compliance test procedures for Qi.

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A brief history of the Qi specification

Qi specifications are numbered with three digits: X.Y.Z. For example 1.0.3

  • X is called the major revision number. Specifications with the same major revision number are backward and forward compatible.
  • Y is called the minor revision number. A change in minor revision number implies that new requirements are introduced while maintaining backward compatibility previously certified products
  • Z is called the editorial revision number. Editorial revisions include clarifications, integrate new transmitter designs into one document, and may add new test to the test specifications.

Current version of the Qi specification

The current version of the Qi specification has version number 1.2.0

This version is currently available only to members of the Wireless Power Consortium. It will also be made available as public download but the date for public release has not yet been determined.

History of the Qi specification

Version 1.0

  • Qi transmitter delivers 5 Watt power into a Qi phone.
  • Choice of transmitter designs include single coil transmitter, coil array transmitter, and moving coil transmitter.
  • High flexibility in design of Qi receivers
  • Limited flexibility in the design of Qi transmitters

Version 1.1

  • Increased design freedom for transmitters. You can now choose between 12 different transmitter specifications.
  • Increased sensitivity of "Foreign Object Detection". This prevents heating of metal objects in the neighborhood of an active transmitter.
  • The possibility to power a Qi transmitter with a USB charger.

Version 1.2

  • Fast charging. The possibility for transmitters to deliver up to 15 Watt power and the option for receivers to obtain up to 15 Watt.
  • An improved thermal test for transmitters
  • Improved timing requirements
  • Changed limits for Foreign Object Detection

Guidelines for automotive aftermarket chargers

The Wireless Power Consortium has developed Qi wireless charging guidelines to help developers create products for the automotive aftermarket. These guidelines, available as a downloadable PDF, can help you make attractive Qi automotive chargers that deliver the promise of the technology while adhering to our adopted standards.