Patent ID: 8716985

Claim:
A power factor correction device comprising: a power stage circuit for connecting to a load receiving an alternating current voltage and a pulse width modulation signal, wherein the power stage circuit converts the alternating current voltage into an input current in accordance with the pulse width modulation signal and outputs the input current to the load to generate an output voltage on the load, and wherein the power stage circuit samples the input current to output a correcting current; a current compensating circuit connected to the power stage circuit for receiving and comparing the correcting current with a reference current signal, thereby generating a compensating current signal; a voltage compensating circuit connected to the power stage circuit for receiving and comparing the output voltage with a reference voltage, thereby generating a compensating voltage signal; a multiplication amplifier connected to the current compensating circuit and the voltage compensating circuit, the multiplication amplifier receives the compensating current signal and the compensating voltage signal, thereby generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter connected to the current compensating circuit and the voltage compensating circuit, the pulse width modulation converter receives the compensating current signal and the compensating voltage signal to generate the pulse width modulation signal to synchronize a phase of the alternating current voltage and the input current.