Compact and Efficient Micro-Inverter


A novel AC-to-DC and DC-to-AC Power Conversion(Rectifier/Inverter) pulsating-power-buffering (PPB) circuit

  • Compact and Efficient Micro-Inverter
Technical name of innovation
Apparatus and methods for conversion between ac and dc, and between dc and ac power
Commercialisation opportunities
Problem addressed

It offers noticeably lower dc-link voltage than conventional circuits, thus can be used with smaller capacitors to reduce size and cost and achieve high efficiency, while maintaining the power factor. It uses low-cost bi-quadrant switches to replace expensive diode / mosfet, while maintaining a high power factor.

  • Heavy component reduction on diodes and MOSFET, leads to lower cost
  • No electrolytic capacitors are needed, which have very limited lifetime
Key impact
  • Works with both AC to DC and DC to AC
  • Long lifetime: As electrolytic capacitors are the usual fault of a power supply, eliminating electrolytic capacitors greatly increase the lifetime
  • High Power Factor Achieving: Power Factor of >0.99, avoiding distortion to the mains
  • Chargers
  • Power Adaptors


  • US Application No. 17/434,463
  • PRC Application No. 202080017290.4
  • EP Application No. 20769354.0
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.