开关电源全桥式变流器建模与仿真

Modeling and Simulation of Full-bridge Convertor for Switch Power Supply

本文研究了一种采用全桥式变流器的开关电源,由基本Buck电路的交流模型的过渡,应用状态平均法建立了其仿真模型。着重对其控制系统进行分析,写出了电流内环各环节的传递函数,完成了反馈网络的设计。电压输出与电感电流达到了期望值,且相位裕度较补偿之前有很大提高。使电源更加稳定,且易于实现。

This paper mainly studies a switch power supply with full-bridge converter which is transited from the basic model of Buck circuit, and establishes its simulation model by applying the state averaging method. By focusing on the analysis of its control system, this paper writes the current inner loop transfer function of each part of the complete design of a feedback network. Voltage output and the inductor current reaches the desired value, and the phase margin is greatly improved compared with before compensation. Then the power supply is more stable and easier to be implemented.