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②在开关电源实际PFC(功率因素校正)电路中,除场效应管V和几个分压电阻外,上述的大部分电路都集成在一块集成电路上,这块集成电路称为功率校正集成电路,如L6560、SG3561、NCPl650、ICEPCS01等。3.整流、滤波电路整流、滤波电路的作用是将交流电转换成300 V左右的直流电压。开关电源电路中通常采用桥式整流和电容滤波方式,典型电路如图11所示。电路中,VDl~VD4是四只整流二极管,C是300 V滤波电容。通过桥式整流电路,可以将交流电压转换成单向脉动的直流电压,通过电容滤波,可将单向脉动的直流电压转换为平滑的直流电压。
② switching power supply in the actual PFC (power factor correction) circuit, in addition to field-effect transistor V and several voltage divider resistors, most of the above-mentioned circuits are integrated in an integrated circuit, this integrated circuit called power-correction integrated circuit , Such as L6560, SG3561, NCPl650, ICEPCS01 and so on. 3. Rectifier, filter circuit rectifier, filter circuit is the role of AC to convert about 300 V DC voltage. Switching power supply circuit commonly used bridge rectifier and capacitor filtering, the typical circuit shown in Figure 11. Circuit, VDl ~ VD4 is four rectifier diodes, C is 300 V filter capacitor. Through the bridge rectifier circuit, AC voltage can be converted into unidirectional pulsating DC voltage, through the capacitor filter, unidirectional pulsating DC voltage can be converted to a smooth DC voltage.