Buck电流馈电全桥拓扑的研究与设计

Study and Design of the Topology of Buck Full-Bridge of Feedback Electricity

详细分析了Buck电流馈电全桥变换器的工作原理及其与Buck电压型全桥变换器的不同点,分析了全桥功率管开关的电流和电压变化情况。该拓扑的全桥变换器的晶体管由于零电压关断而没有关断损耗,而且与变压器漏感串联零压导通,所以导通损耗也很小。设计了Buck电流型全桥主电路、Buck开关管的吸收电路、PWM控制电路及隔离驱动等电路。通过实验验证了该变换器很适合大功率、高电压输出的场合,具有一定适用性和可靠性。

The topology and principle of buck feedback electricity full-bridge converter are particularly analyzed and differentia with voltage feedback electricity converter is pointed out. The current and voltage process of buck full-bridge power transistors switching are discussed, which can reduce transistors switch loss effectively. Because of zero-voltage switch, little conduction loss with transformers leakage-inductor. Meanwhile, Buck switching absorption circuit, PWM control circuit and isolation drive circuit are also designed. Experimental studies validate the converter is adaptable to high power and high voltage output situation and has some application and reliability.