Quasi-resonant Converter Based on Inductance Multiplexing

A wide-range quasi-resonant converter based on inductance multiplexing is proposed to meet the demand for isolated DC-DC converters for a wide voltage range in new energy generation systems. By introducing resonance technology, the converter can achieve zero voltage switching (ZVS) on the primary side and zero current switching (ZCS) on the secondary side under reasonable parameter design, solving the contradiction between traditional current doubling rectifier ZVS implementation and duty cycle loss; By adopting the concept of inductance reuse, the excitation inductance of the transformer does not need to be designed too small to achieve a wide range of voltage regulation, effectively improving the voltage gain range within a narrow switching frequency range. Compared to full wave rectification, it optimizes the winding utilization of the transformer. Based on the working characteristics of the converter, the soft switching conditions and voltage gain of the proposed converter were analyzed and derived, followed by a parameter design method. Finally, the feasibility of the converter topology and the correctness of theoretical analysis were verified through experiments on an 800 W prototype.