Power factor correction circuit and power supply apparatus...

Details Power factor correction circuit and power supply apparatus... Power factor correction circuit and power supply apparatus...

2008-04-28

2010-06-01

Vu, Bao Q (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S284000, C323S285000, C323S288000

Reexamination Certificate

active

07728570

ABSTRACT:
A power factor correction circuit including a boost converter, a first capacitor, a first resistor, and a boost control unit is provided. The boost control unit includes a signal generator and a frequency controller. The boost converter transforms a rectified voltage to a correction voltage according to a pulse width modulation (PWM) signal. The first capacitor and the first resistor are coupled between an input terminal and a ground terminal of the boost converter. The boost control unit is adapted to generate the PWM signal, and adjust a duty cycle and a frequency of the PWM signal according to a current flowing through the first resistance, the rectified voltage and the correction voltage. Wherein, the signal generator is adapted to generate a ramp signal and adjust a slope of the ramp signal according to a charging current. The frequency controller adjusts the charging current according to the rectified voltage.

REFERENCES:
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patent: 6388429 (2002-05-01), Mao
patent: 7012413 (2006-03-01), Ye
patent: 7595623 (2009-09-01), Bennett
patent: 2006/0176029 (2006-08-01), McGinty et al.
patent: 2008/0136395 (2008-06-01), Bennett

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