宽电压RCD钳位Flyback变换器的参数优化设计

Optimization Design of Wide Voltage RCD Clamped Flyback Converter Parameters

分析了RCD钳位Flyback变换器的工作原理及能量传输过程特点,得出了励磁电感、滤波电容、吸收电阻以及钳位电容等参数在宽电压范围内的变化规律。针对分布式发电系统、UPS等特殊应用环境下,需要Flyback电源能够在宽电压范围内都能正常工作,因此考虑到全动态范围内的最恶劣工况,给出了RCD钳位Flyback变换器各元件参数的设计方法,使得变换器在全动态范围的工作性能都能符合设计指标要求。最后通过仿真和实验验证了宽电压范围参数设计的合理性。

The working principle of RCD clamped Flyback converter and the characteristics of energy transmission process were analyzed.The variation rules of excitation inductance,filter capacitance,absorption resistance and clamp capacitance in wide voltage range were obtained.For distributed generation system,UPS and other special application environments,Flyback power supply is required to operate normally in a wide voltage range,therefore,the worst operating conditions in the whole dynamic range were considered,the design method of each component parameter of RCD clamped Flyback converter was given,the performance of the converter in the full dynamic range could meet the design requirements.Finally,the rationality of parameter design in wide voltage range was verified by simulation and experiment.