Wireless Battery Charging System with Coordinated Control


This invention utilizes extra switching operations of power switches in the receiver circuit to charge the battery directly from the output of the rectifier with CC mode or CV mode.

  • Wireless Battery Charging System with Coordinated Control
Technical name of innovation
A Wireless Battery Charging System and Method for Battery Charging and Handshaking
Commercialisation opportunities
Problem addressed

A typical wireless charging system for lithium-based rechargeable batteries involves a battery charging circuit to switching between CC (constant current) and CV (constant voltage) mode without using an extra DC Regulator.

  • Significant component reduction, from 6 diodes to 1 diode, and DC regulator is eliminated
  • No electrolytic capacitors is needed, which is prone to failure
  • Conventional transistors can be adopted as the switches at the receiver side
Key impact
  • Able to deliver high power
    • Suitable for EV charging up to 7.2kW as DC retifier is no longer used
  • Reducing cost in the receiver side
    • As the control circuit is implemented only in the transmitter side, the cost of the device that receiving power is significantly decreased
  • EV Charger
  • Mobile device


  • US Patent No. 10,305,331
  • PRC Application No. 201580081360.1
  • Germany Application No. 112015006497.4
The University of Hong Kong (HKU)

Founded in 1911, The University of Hong Kong (HKU) is the first and oldest institution of higher education in Hong Kong. For over a century, the University has dedicated itself to creating knowledge, providing education, and serving society. Today, HKU has an established worldwide reputation for being a research-led comprehensive University with ten Faculties and a strong commitment to intellectual freedom, liberty and diversity. HKU has a proud record of academic recognition in researches through honours and awards received from both local and international bodies.