Traditionally, the energy feedback in synchronous rectifier (SR) LLC converter was once considered to only have the ability to reduce the voltage gain. In this article, a kind of special energy feedback caused by the novel operation modes of LLC resonant converter is proposed for improving voltage gain. Compared to the P, O, and N stages in conventional LLC converter, stage F is built by controlling the turn-on early time of the SR. By using the proposed operation modes, not only zero-voltage switching (ZVS) of both the primary-side and secondary-side switches is achieved, but the voltage gain of the LLC converter can be increased significantly with a narrow switching frequency range and a smaller magnetizing inductance circulating current. In addition, the proposed operation modes are simple and easy to be utilized in full bridge, half bridge, and so on; all kinds of LLC converters thus can form a new general control strategy of the SR LLC. Finally, a 100-W half-bridge SR LLC dc-dc converter prototype with a wide voltage-regulation range is implemented to validate the proposed operation modes and the theoretical analysis.
Wide Voltage-Regulation Range Synchronous-Rectifier LLC Converter With Novel Operation Modes
IEEE Transactions on Transportation Electrification ; 11 , 4 ; 8768-8783
2025-08-01
8103320 byte
Article (Journal)
Electronic Resource
English
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