高频变压器次级串联开关电源的实现

摘要

Based on planar transformer, secondary soft-switching technology and CA 1524 controller, 12 V/220 V DC/DC converter is designed, which is made up of single-stage push-pull inversion-full bridge rectification with the efficiency of 90％.Scheme with insories secondary windings of transformers is proposed to achieve output power of 1 kW and efficiency of 90％.The whole efficiency curves on the basis of different input voltage and different output power are shown.The experimental results indicate that switch mode power supply for multistage series secondary windings of transformers with resonant soft-switching has good indexes, which is suitable for application in situation of low input voltage and large input current.%基于平面变压器、次级软开关技术和CA 1524控制器,设计了满载效率为90%的单级推挽逆变一全桥整流的12 V/220 V DC/DC变换器单元,以及次级绕组两级串联方案,实现了输出功率1 kW以上,满载效率90%.给出了实测波形和不同输入电压和不同输出功率条件下的整机效率曲线.实验结果表明,谐振软开关次级多级串联开关电源各项指标良好,适合输入端为低电压大电流应用场合.