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传统的开关电源采用电容输入型二级管整流电路,电流呈脉冲波形,功率因数较低。本文设计的高功率因数开关电源由AC-DC变换电路、DC-DC变换电路、PFC控制电路、功率因数检测电路、数字设定及测量显示电路和保护电路六部分组成。其中,AC-DC变换电路采用桥式不控整流方式,DC-DC变换电路采用Boost拓扑结构,PFC控制芯片采用UCC28019,可实现36V稳定输出,测量显示电路利用C8051F020单片机实现,该电源的主要优点是功能直观,稳定性好,功率因数大幅度提高。
The traditional switching power supply capacitor input type diode rectifier circuit, the current pulse waveform, low power factor. This design of high power factor switching power supply by the AC-DC converter circuit, DC-DC converter circuit, PFC control circuit, power factor detection circuit, digital setting and measurement display circuit and the protection circuit of six parts. Among them, the AC-DC conversion circuit using bridge-type non-controlled rectifier, DC-DC converter circuit using Boost topology, PFC control chip UCC28019, can achieve a stable output of 36V, measurement display circuit using C8051F020 microcontroller, the main advantages of the power Is intuitive function, good stability, a substantial increase in power factor.