硬开关全桥电路工作原理及波形分析

硬开关全桥变换电路是一种用于直流至交流变换的电路，其中包括IGBT或者MOS管以及并联的二极管和电容。在工作过程中，Q1和Q4同时导通，在t0-t1时间段内，导通时间为D*Ts。原边和副边电流的走向如红色曲线指示方向。变压器原边绕组电压VAB为输入电压Vin，副边整流二极管D5和D8导通，而D6和D7因为承受Vin/K的反向电压而截止。 在工作过程中，输出电感Lout承受正向的电压Vin/K-VO，电感电流IL线性上升。流过输出电容Cout的电流IC为。整个工作过程中，硬开关全桥变换电路能够有效地实现直流至交流的变换，并能够提供稳定的输出电流。通过控制IGBT或MOS管的导通和关断，可以实现对输出电压和电流的精确控制。Hard-switching full-bridge converter circuit is a circuit used for DC to AC conversion, including IGBT or MOS transistors, parallel diodes and capacitors. In the working process, Q1 and Q4 are conducting simultaneously. In the time period t0-t1, the conduction time is D*Ts. The direction of the primary and secondary current is indicated by the red curve. The primary winding voltage VAB of the transformer is the input voltage Vin, and the secondary rectifier diodes D5 and D8 are conducting, while D6 and D7 are cut off due to the reverse voltage Vin/K. In the working process, the output inductance Lout bears the positive voltage Vin/K-VO, and the inductance current IL increases linearly. The current IC flowing through the output capacitor Cout is. Throughout the working process, the hard-switching full-bridge converter circuit can effectively realize DC to AC conversion and provide stable output current. By controlling the conduction and turn-off of IGBT or MOS transistors, precise control of output voltage and current can be achieved.