一种谐振型高压侧调制的电流型双向变换器

A Resonant Current-Fed Bi-Directional Converter with High-Voltage-Side Modulation

针对传统电流型变换器存在的关断电压尖峰问题和硬开关现象,提出一种谐振型高压侧调制的电流型双向直流变换器。该变换器通过引入变频控制和高压侧调制策略,可以实现低压侧开关管的自然换流和零电流关断(ZCS),消除了低压侧开关管关断电压尖峰。首先分析电路的正向工作和反向工作模式的工作原理,然后对变换器进行详细的特性分析和设计,最后建立一台400W的样机并进行了测试。实验结果验证了所提电路拓扑及控制策略的优势与可行性。

In order to suppress the turn-off voltage spike and overcome the hard-switching in traditional current-fed converters, this paper proposes a resonant current-fed bi-directional converter with high-voltage-side modulation. By adopting a variable frequency control and modulating the high voltage side, the proposed converter can operate with natural commutation and ZCS turn-off for the low-voltage-side MOSFETs. The turn-off voltage spikes of low-voltage-side MOSFETs are eliminated as well. First, the operation principles under the forward operation mode and backward operation mode are analyzed. Then the characteristics and design guideline of the proposed converter are detailed. Finally, a 400W converter prototype is built and tested. The experimental results verify the feasibility and advantages of the proposed converter and control strategy.