Part active power factor correction circuit controlled by input voltage threshold value
A technology of input voltage and voltage threshold, which is applied in the direction of output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of large number of electronic devices, increased circuit overhead, and large circuit area, so as to reduce overhead and reduce Effect of small area and reduced number of electronic components
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Please refer to figure 1 , the partial active power factor correction circuit of the present invention controlled by the input voltage threshold includes a double-loop controlled boost boost circuit 1, a voltage error amplifier 2, a multiplier 3, a current error amplifier 4, an input voltage sampling signal sampling threshold judgment module 5, A PWM waveform generating module 6 and a PWM driving IC (chip) 7 .
[0022] Among them, the boost circuit 1 includes a rectifier bridge (RB), an inductor (L), a diode (D), a power switch tube (S), a capacitor (C), a current sampling resistor (Rs), a first resistor (R1), The second resistor (R2), the third resistor (R3), and the fourth resistor (R4). The input end of the rectifier bridge is used to connect to the alternating current, one end of the inductor and one end of the first resistor are connected to the positive ...
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