Control principle of Boost PFC circuit - Power Circuit - Circuit Diagram
Main circuit: Tr: Current transformer control circuit: M: Multiplier; VA: Voltage error amplifier (K1); CA: Current error amplifier (K2)
Working principle: VA output: VA=K1(Vr-Vo); rectified voltage: Vdc=kVin sinï·t; reference signal of input current: M=VA, Vdc=K1kVin sinï·t
The output of CA: CA=K2(M-Is); when K2ï‚® is infinite, Is=M= K1kVin sinï·t
Where Is is the low frequency component; Is is proportional to Vdc (=Vin sinï·t)
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