Power Electronics / Power Management


Qi 1.3 wireless charging reference design

28 July 2021 Power Electronics / Power Management

The Wireless Power Consortium (WPC) recently released the Qi 1.3 specification that requires authentication for improved safety when transmitting up to 15 W of power between a transmitter and a receiver.

To meet the requirements of the specification, Microchip Technology announced a new Qi 1.3 wireless charging reference design, providing developers of wireless charging systems for automotive and consumer applications with the necessary tools and support for the seamless integration and certification of new-generation product designs.

For wireless charging system developers launching certified Qi 1.3 transmitters under tight timelines, this three-coil reference design provides a head start for product development. The reference design fully integrates secure storage subsystem software with the wireless power microcontroller (MCU) and is a flexible solution, enabling custom topologies and foreign object detection (FOD) implementation.

As a regular member in the Wireless Power Consortium (WPC), which sets global standards for wireless charging of mobile devices, Microchip provided expertise during development of the Qi 1.3 specification. Qi 1.3 is a significant update from Qi 1.2.4 and mandates hardware-based authentication between transmitter and receiver devices for power transfer above 5 W. By adhering to the new authentication standard, designers can ensure devices receiving 15 W are receiving it from a Qi-certified, authenticated transmitter to ensure safety.

Included in Microchip’s reference design solution for wireless charging systems are all required elements: Qi controller, Qi application software, provisioned authentication controller that is a WPC-approved secure storage subsystem, and crypto software libraries that execute on the Qi controller. The reference design includes complete schematics, bill of materials, software and design guidelines. Microchip is partnering with Avnet to make evaluation boards for the Qi reference design available to qualified customers around the world.

To support its Qi 1.3 wireless power solution, Microchip provides the dsPIC33C family of devices to run the Qi application software and the ECC608/TA100 secure storage subsystem provisioned by Microchip as a licensed WPC manufacturing certificate authority. As a total system solution, this reference design also incorporates MIC4605 and MCP14700 gate drivers, MCP16331 and MCP1725 regulators, an MCP6C02 current sense device, an ATA6563 CAN transceiver and an


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