2019 Ministry of Science and Technology Semiconductor Moon Shot Program Final Exhibition

Sub-Project 3- High-Efficiency High-Power-Density LLC Converter

This sub-project aims to study and develop high power density converters and inverters using wide bandgap devices by our research team at high switching frequencies. The fast switching property of Wide Band-Gap (WBG) power semiconductor devices can reduce the losses and improve conversion efficiency, therefore, increasing the total power density. There are three primary methods to increase power density. First, analyze each topology’s pros and cons using simulation and calculation. Second, use WBG devices to increase switching frequency and decrease the size of magnetic components. Third, evaluate and integrate the magnetic design to reduce size while improving performance. During this year, we realization of an isolated DC/DC resonant converter at 1kW and 1 MHz to optimize the design of plate transformers under high-frequency operation and meet the high-efficiency requirements. A quarter-turn planar transformer structure is proposed and implemented in an LLC resonant converter for server power supply applications. Wide-bandgap switches were utilized to implement a resonant converter with 1-MHz operating frequency, 380-V input voltage, 12-V output voltage, 1-kW output power, 14.2-W/cm3 power density, and 97% maximum efficiency.


Group photo of some of the sub-program advisors.

Prof. Yu-Chen Liu and graduate students Chen-Chen, Kai-De Chen and Yong-Long Syu attended the exhibition and presented their research posters.


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