软开关逆变器谐振过程解耦分析与参数设计

通过对移相控制全桥软开关功率变换器的超前臂并联谐振网络和变压器原边串联谐振网络解耦,从实现超前臂功率器件全负载范围零压软开关的角度,对超前臂谐振网络的工作过程进行了深入分析.通过理论计算和电路仿真,研究了电源输出电流、谐振电感和电容对超前臂功率器件开关死区时间和损耗的影响规律.考虑谐振电感的自身损耗,给出了谐振电感和电容参数的设计方法.在此基础上,通过试验获得了超前臂功率器件的死区时间随输出电流变化的数据以及空载状态下的电压电流波形.试验数据和波形与理论、仿真分析结果吻合良好.

Decoupled analysis of resonant process and parameters design for soft-switching inverter

Aimed at the zero-voltage soft-switching of leading-leg power devices in full load range, the resonant process of leading-leg parallel resonant network was analyzed fully after decoupling of the leading-leg parallel resonant network and transformer primary side series resonant network in phase-shift controlled full-bridge soft-switching power converter. Based on the theoretical computation and circuit simulation, the influence laws of power output current, resonant inductance and capacitance on the switching dead-time and loss of leading-leg power devices were researched. Taking the loss of resonant inductance into account, a design approach of resonant inductance and capacitance was provided. On the above basis, by experiments, the data of dead-time changing with output current for leading-leg power devices was acquired; the voltage and current waveforms at no-load state were also measured. The experimental data and waveforms agreed well with the theory and simulation results.