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

320 / 2017-12-08 18:25:48

A Novel and Compact SiC Hybrid Forward-Flyback DC DC Converter

hybrid, resonant forward, flyback, cascode, high efficiency, SiC

Plenary track > Very high efficiency and compact converters

A novel hybrid resonant-forward, PWM-flyback DC-DC converter is presented in this paper. The forward part and flyback part in the proposed topology share the same primary winding and power transistor. It utilizes resonant forward circuit as output to realize main power transmission with minimum power consumptions. The output of flyback circuit is connected in series with the primary side to realize the magnetizing current reset and output voltage regulation. The proposed topology makes the most of transformer energy and combines the advantages of both forward and flyback converter. The resonant forward output is independent of the load and duty cycle and simple regulation can be achieved by flyback PWM control. Zero current turned off is achieved at secondary diode. All of the above make the proposed topology a good candidate for efficient high frequency switching applications, especially for high-input, low-output and high current conditions. A 400V to 20V SiC based high frequency DC DC converter is built to demonstrate the proposed architectures. The peak efficiency reaches to 95% at 65W output and 200 KHz switching frequency. More testing results for higher output power will be provided in final paper.