[논문]전기자동차 급속충전기용 넓은 전압 범위를 갖는 30kW급 SiC MOSFET 기반 고속 스위칭 LLC 컨버터 설계 및 병렬 운전

이기영; 민성수; 박수성; 조영찬; 이상택; 김래영

doi:10.6113/tkpe.2022.27.2.165

전기자동차 급속충전기용 넓은 전압 범위를 갖는 30kW급 SiC MOSFET 기반 고속 스위칭 LLC 컨버터 설계 및 병렬 운전
Design and Parallel Operation of 30 kW SiC MOSFET-Based High Frequency Switching LLC Converter With a Wide Voltage Range for EV Fast Charger 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.2, 2022년, pp.165 - 173

이기영 (Div. of Energy Engineering, Daejin University) , 민성수 (Dept. of Electrical Engineering, Hanyang University) , 박수성 (Dept. of Electrical Engineering, Hanyang University) , 조영찬 (Korea Electronics Technology Institute) , 이상택 (Korea Electronics Technology Institute) , 김래영 (Dept. of Electrical Bio-Engineering, Hanyang University)

Abstract ▼ AI-Helper

The electrification trend of mobility increases every year due to the development of power semiconductor and battery technology. Accordingly, the development and distribution of fast chargers for electric vehicles (EVs) are in demand. In this study, we propose a design and implementation method of an LLC converter for fast chargers. Two 15 kW LLC converters are configured in parallel to have 30 kW rated output power, and the control algorithm and driving sequence are designed accordingly and verified. In addition, the improved power conversion efficiency is confirmed through zero-voltage switching (ZVS) of the LLC converter and reduction of turn-off loss through snubber capacitors. The implemented 30 kW LLC converters show a wide output voltage range of 200-950 V. Experiments applying various load conditions verify the converter performance.

주제어

표/그림 (15)

그림 Fig. 1. Configurations of modular power converters for EV fast charger. (a) Non-isolated DC/DC converter with AC transformer, (b) Single isolated DC/DC converter, (c) Single isolated DC/DC converter with non-isolated converter, (d) Parallel connected isolated DC/DC converters.
그림 Fig. 2. Charging performance requirements for EV fast charger. (a) Constant current and constant power, (b) Constant current.
그림 Fig. 3. LLC converter with snubber capacitors.
그림 Fig. 4. Half-bridge and full-bridge operation of LLC converter. (a) Half-bridge, (b) Full-bridge.
표 TABLE I DESIGN SPECIFICATION
표 TABLE Ⅱ DESIGN RESULTS AND DEVICE SPECIFICATIONS
그림 Fig. 5. Voltage gain curve of designed LLC converter. (a) Half-bridge with V_out = 200 V, (b) Full-bridge with V_out = 500 V, (c) Full-bridge with V_out = 950 V.
그림 Fig. 6. Detailed control block diagram.
그림 Fig. 7. Firmware development environment with dual-core DSP control board.
그림 Fig. 8. Control firmware flow chart.
표 TABLE III CONTROLLER PARAMETERS
그림 Fig. 9. Experimental results of single 15 kW LLC converter. (a) Minimum voltage reference (200 V), (b) Maximum voltage reference (950 V).
표 TABLE IV EXPERIMENT CONDITIONS
그림 Fig. 10. Efficiency curve by output voltage.
그림 Fig. 11. 30 kW parallel operation result.

참고문헌 (14)

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