一种多级耦合双桥移相倍频DC-DC变换器

A Double Frequency DC-DC Converter Based on Multi-stage Coupled and Dual Bridges with Phase-shifting

提出了一种多级耦合双桥移相倍频DC-DC变换器。变换器将2路传统的全桥变换电路通过2组多级耦合电感(带中心抽头)桥联至负载两端,通过移相控制方法负载端可实现倍频效果,克服IGBT工作频率受限的弊端。同时,电感多级耦合特性在拓扑桥联电路中既能有效地抑制各桥臂电压尖峰也能降低输出电流纹波。建立了新型变换器数学模型并分析了其工作原理,最后,搭建10 kW空气式逆变等离子切割电源实验平台,验证了新型拓扑的正确性和可行性。

A double frequency DC-DC converter based on multi-stage coupled and dual bridges with phaseshifting was proposed.The converter bridged two traditional full-bridge circuits through two sets of multi-stage coupled inductors(with central taps)to both ends of the load.The effect of double frequency could be achieved by phase-shifting control method at load end,and the frequency limit of IGBT could be overcome.Moreover,the inductance characteristics of multi-stage coupled in topological bridge circuit could restrain the peak voltage of bridges effectively and reduce the ripple current of output greatly.The mathematical model was established and the working principle of the new converter was analyzed.At last,the experimental platform of 10 kW air-type inverted plasma cutting power supply was built to verify the correctness and feasibility of the new topology.