A power factor correction circuit and its correction method
A power factor correction and circuit correction technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve low THD value, input current distortion, total harmonic distortion affecting the circuit, etc. problem, achieve the effect of reducing THD value and reducing impact
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 Such as Figure 7 As shown, it is a partial circuit schematic diagram of a power factor correction circuit according to an embodiment of the present invention.
 A power factor correction circuit includes a THD correction circuit, and the THD correction circuit includes a compensation voltage source generating circuit 201 and a compensation current limiting circuit 202 .
The compensation voltage source generation circuit 201 is used to generate a negative compensation voltage source, which includes a first capacitor C1, a third diode D3, a fourth diode D4, and a second capacitor C2. One end of the first capacitor C1 is used as the first input end of the THD correction circuit, the other end of the first capacitor C1 is connected to the anode of the third diode D3 and the cathode of the fourth diode D4, and the end of the fourth diode D4 The anode serves as a port connected to the compensation current limiting circuit 202 and is connected to one end of th...
 Figure 9 It is the second embodiment of the present invention.
 The main difference from Embodiment 1 is that a compensation voltage adjustment circuit 204 is added, which is connected in series between the first input signal and the compensation voltage source generation circuit 201, and is used to adjust the output voltage amplitude of the compensation voltage source generation circuit 201 . The compensation voltage adjustment circuit 204 includes a fifth diode D5, a sixth diode D6, a third resistor R3 and a fourth resistor R4.
 Wherein the anode of the fifth diode D5 is connected to the cathode of the sixth diode D6 as the new first input terminal of the THD correction circuit, and is connected to the pulse width signal with high and low level signals, and its input signal is Vpwm , usually the first input end can be connected to the drive signal end or one end of the auxiliary winding of the inductor; the cathode of the fifth diode D5 is connected...
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