Abstract：The traditional dual active bridge DC-DC converter has the problems of narrow switching range and low switching frequency. Therefore, an isolated bidirectional hybrid LLC resonant converter is proposed for the energy storage structure of renewable energy distributed power generation systems. The converter can operate in three modes of full-bridge LLC converter (FLLC), dual-phase half-bridge LLC converter (DLLC) and single-phase half-bridge LLC converter (SLLC) by different modulation schemes without using additional devices. With the help of the magnetizing inductance of transformer, three different operating modes can realize the zero-voltage switching turn-on for all the MOSFETs on primary and secondary sides, regardless of the forward or backward operation, which can reduce the turn-on loss of switches, achieve high-efficiency bidirectional power conversion and wide voltage gain adjustment, and improve the efficiency of the converter under light load. And these three operating modes can be smoothly and stably transitioned. Finally, an 800W experimental prototype based on Silicon Carbide (SiC) devices is built. The experimental results verify the feasibility, effectiveness and stability of the proposed circuit topology and its control method.
朱小全, 刘康, 叶开文, 蒋黎明, 金科. 基于SiC器件的隔离双向混合型LLC谐振变换器[J]. 电工技术学报, 2022, 37(16): 4143-4154.
Zhu Xiaoquan, Liu Kang, Ye Kaiwen, Jiang Liming, Jin Ke. Isolated Bidirectional Hybrid LLC Converter Based on SiC MOSFET. Transactions of China Electrotechnical Society, 2022, 37(16): 4143-4154.
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