IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia 2018)

240 / 2017-11-22 15:47:19

Two Stage eGaN FET-Based Isolated Class E DC-DC Converter

Class E dc-dc converter, On-Off control, resonant converter, two stage structure,

Plenary track > Hard-switched and soft-switched applications

On-Off control is commonly adopted to regulate the output voltage of the isolated Class E DC-DC converter when the switching frequency is higher than 10MHz. In this control scheme, the parameters are usually designed at the lowest input voltage to ensure enough output power capacity. Unfortunately, it is revealed that with the increase of the input voltage, the conversion efficiency would decrease greatly under On-Off control. To solve this problem, a two stage isolated Class E DC-DC converter structure is proposed in this paper. In the two stage structure, a voltage step down circuit is introduced to help regulate the input voltage of the traditional isolated Class E DC-DC converter. This paper takes Buck circuit and Switching Capacitor(SC) circuit as the voltage step down circuit respectively, and comparisons are drawn in terms of the volume, cost and efficiency.