一种具有自限流功能的LLC谐振变流器拓扑

New LLC Resonant Converter Topology with Self Current-limitation

提出了一种新型的具有自限流功能的LLC谐振变流器拓扑,在过流或短路时能有效地限制 电流增长,从而起到保护电路的作用。给出了详细的理论分析和电路参数优化设计考虑以实现较 好的限流效果;针对一台输出为110 V／10 A的电力操作电源实例给出了具体参数设计步骤,并通 过计算与仿真来验证参数设计结果,最后制作了一台相同参数的实验样机,进行了实验验证。理论 分析和实验结果表明,所提出的拓扑具有结构简单、限流效果好、频率变化范围窄等优点,特别适合 工业应用如电力操作电源等。

A new LLC resonant converter topology with self current-limitation ability is proposed. The circuit current can be controlled effectively under the over-current or short-circuit conditions, hence the converter can be protected. Detailed theoretical analysis and optimization design considerations are presented to achieve a good.current limitation effect. Detailed steps on the parameter design of a 110 V/10 A output electrical power supply are listed. Calculations and simulations are given to illustrate the design results. Finally a laboratory prototype with the designed parameters is built up to verify the theoretical analysis. The analysis and experimental results show that the proposed topology has some attractive merits including simple structure, good current limitation effect and narrow frequency range etc. , thus it is very suitable for the industrial applications such as electrical power supply.