This paper first compares the soft switching technology of different LC resonant circuits, and analyzes the circuit principle, working mode and output characteristics of the self-driven LLC half-bridge resonant converter. Secondly, the DC gain of the converter is analyzed by complex frequency domain analysis, and the output voltage ripple is mathematically analyzed, laying the foundation for circuit parameter design. Then, the circuit and main parameters of the converter are designed, the optimization of the self-driving circuit and the startup circuit is completed, and its rationality is verified by simulation. In view of the shortcomings of the converter open-loop operation, a scheme of the secondary voltage adjustment circuit of PWM closed-loop control is proposed. Finally, according to the analysis, design and simulation results, the LLC type self-driven half-bridge resonant converter device is made, and the zero voltage switching characteristics of the converter and the effect of the secondary voltage adjustment circuit are analyzed and verified by collecting the circuit waveform. At the same time, the output characteristics, efficiency and loss of the converter under different loads are investigated.
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