Hing Kit Kwan

Title: Innovations of Hing Kit Kwan

Introduction

Hing Kit Kwan is a notable inventor based in Hong Kong, CN. He has made significant contributions to the field of power electronics, holding a total of 5 patents. His work focuses on improving the efficiency and reliability of power converters, particularly in LED applications.

Latest Patents

One of his latest patents is an "LED driver with small output ripple without requiring a high-voltage primary-side electrolytic capacitor." This invention addresses the challenge of reducing output ripple without the use of an electrolytic primary-side capacitor, which can negatively impact product lifespan. The design employs Primary-Side Regulation (PSR) using an auxiliary winding to maintain a regulated secondary voltage while minimizing low-frequency ripple. A smaller secondary capacitor, which is not electrolytic, filters the output on the secondary side. Additionally, a bang-bang controller is utilized to manage the secondary side current, effectively reducing current ripple despite voltage fluctuations.

Another significant patent is for an "output current estimation for an isolated flyback converter with variable switching frequency control and duty cycle adjustment for both PWM and PFM modes." This innovation features a current-estimating control loop that senses the primary output current in a transformer to regulate the secondary output. The primary-side control circuit switches the primary current on and off, generating a discharge time for the secondary current through an auxiliary winding. The system calculates a normalized duty cycle and adjusts the oscillator frequency and peak current to control primary switching, enhancing the overall performance of the flyback power converter.

Career Highlights

Hing Kit Kwan is currently associated with the Hong Kong Applied Science and Technology Research Institute. His work at this institution has allowed him to collaborate with other talented individuals in the field, contributing to advancements in technology and innovation.

Collaborations

Some of his notable coworkers include Wai Kit (Victor) So and Chik Wai (David) Ng. Their collaborative efforts have further enriched the research environment and fostered innovation within their projects.

Conclusion

Hing Kit Kwan's contributions to power electronics through his innovative patents demonstrate his commitment to enhancing technology in the field. His work not only addresses current challenges but also paves the way for future advancements in power conversion technology.