디지털제어를 적용한 전기차용 동기정류기형 DC-DC 컨버터 설계

The power supply devices applied to the electric vehicle are required for high efficiency and high power density. This paper presents a digital controlled ZVS DC-DC converter. The proposing system using synchronous rectifier has advantages of high efficiency, simple circuit, and lightweight. The operating principle, theoretical analysis, and design guidelines are provided in this paper. The simulation waveforms of the proposed converter are shown to verify its feasibility. Regarding the control of the converter, only one 32bit Tricore microcontroller is used for the feedback control of output power and driving all switches. Therefore, the simplest digital control block for this DC-DC converter is established. To verify the performance of the proposed converter, a 1.7kW DC-DC converter was made and tested. On the result of the test, it is obtained the maximum efficiency of 95%.