전기/하이브리드 자동차에 적용이 가능한 높은 강압비와 효율을 갖는 3kW급의 절연형 DC-DC 컨버터 설계 방법

We proposed 3kW bi-directional inverter and DC-DC converter system with high step down ratio and efficiency in this paper. The proposed system is consisted to 3 parts. The first one is Full-Bridge part to isolate input and output and 2nd part is Push-Pull topology to control the output voltage. The last one is the inverter part to transfer the power from DC to AC. The inductor and MOSFET cause conduction loss especially in high current condition. We moved the inductor to lower current part and decreased the number of MOSFET in high current part to decease power loss. And we decreased power loss by using phase shift switching and add the proper dead time for the inverter part. The proposed system can be used for wide application such as electronic(hybrid) car, BMS and any power transfer system.