A Boost-LC Resonance Multimode DC-DC Converter for EV Charger Application
IEEE Transactions on Transportation Electrification（2023）
摘要
This paper proposes a Boost-
LC
resonance multimode dc-dc converter for EV charger application. The converter adds an additional leg to the conventional full-bridge (FB)
LLC
resonant converter. By adopting the hybrid modulation method of pulse width modulation (PWM) and pulse frequency modulation (PFM), the proposed converter can have three operating modes within a narrow switching frequency range. In high-voltage-gain (HG) mode, the Boost energy storage stage replaces the
LLC
resonant energy storage stage of the conventional FB
LLC
resonant converter, which effectively improves the voltage gain. Thus the magnetizing inductor of the proposed converter can be designed large, the magnetizing current and the circulating current are small. In addition, the voltage stress of the resonant capacitor of the proposed converter is small, which is conducive to the realization of high power density. In medium-voltage-gain (MG) and low-voltage-gain (LG) modes, the converter works as conventional FB and half-bridge (HB)
LLC
resonant converters respectively, but has a smaller magnetizing current. In this paper, the operation principle, the voltage gain formula, the design method, and the topologies comparison are introduced in detail. Finally, an experimental prototype with 200V input voltage, 75~300V output voltage, and 0~5A output current was built. The experimental results verify the correctness of the theoretical analysis.
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关键词
DC-DC converter,PWM-PFM,multimode,high voltage gain,high efficiency
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