双降压式全桥逆变器

为避免桥臂功率管直通问题和提高输入直流电压利用率，在全桥逆变器和双降压式半桥逆变器的基础上，提出了双降压式全桥逆变器(dual buck full-bridge inverter，DBFBI)，该逆变器具有无桥臂直通、输入直流电压利用率高、效率高、续流二极管可优化选取等优点。半周期调制方式减小了功率管的开关损耗及导通损耗，分析了半周期调制方式下电路的工作模态，给出了电感电流连续与断续时输入输出电压关系。设计了采用滞环电流控制的双降压式全桥逆变器系统，通过控制逻辑设计使之实现了半周期运行模式。仿真和实验结果证明该逆变器具有高质量的输出电压波形和良好的动态响应特性。

Dual Buck Full-bridge Inverter

In order to avoid shoot-through problem of the power devices in bridge legs and improve the utilization of DC input voltage, dual buck full-bridge inverter (DBFBI) was proposed based on full-bridge inverter and dual buck half-bridge inverter. It has the advantages of no shoot-through problem, high-utilization of DC input voltage, high-efficiency and optimum selection of the freewheeling diodes. By adopting half cycle modulation, the switching losses and conduction losses of the power devices are reduced. The operation modes of the topology under the half cycle modulation were analyzed. The relations of input voltage and output voltage in discontinuous conduction mode and continuous conduction mode were given out. DBFBI with hysteresis current control was designed. The half cycle operation mode was achieved by the design of control logic. Both the simulation and experimental results verify that DBFBI has a good sinusoidal output waveform and fast dynamic response performance.