Research

Miniaturized ac-dc LED driver

Developed a miniaturized LED driver: 35W power level, high efficiency, high power factor, five times smaller than the conventional designs.
fig1

 

Miniaturized ac-dc ac-dc isolated converter

Designed a miniaturized isolated ac-dc converter: 50W/100W power level, high efficiency, high power factor, five times smaller than the state-of-the-art converters, high switching frequency at 1-10 MHz with zero-voltage-switching operation.
fig2
fig3

 

Novel stacked power-factor-correction (PFC) architecture

Proposed and patented a new power factor correction architecture (stacked structure) applicable to many grid interfacing applications.
pfc_architecture_schematic-with-control2

 

Simple Control Isolated Bus Converter

Developed a new isolated dc-dc bus converter: high switching frequency operation at 1-5 MHz, simple control circuitry, and high efficiency with zero-voltage-switching operation.
isolation_cap_aid
fig4

 

High Frequency Magnetic Material Investigation

Investigated the low permeability magnetic core materials (NiZn and Powdered Iron) at high frequency (1-10 MHz) for inductor and transformer design.
fig5