PFC-PWM controller having a power saving means

Details PFC-PWM controller having a power saving means PFC-PWM controller having a power saving means

2005-01-04

2005-01-04

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S097000, C363S021070

Reexamination Certificate

active

06839247

ABSTRACT:
A PFC-PWM controller with a power saving means is disclosed. A built-in current synthesizer generates a bias current in response to feedback voltages sampled from the PWM circuit and the PFC circuit. The bias current modulates the oscillation frequency to further reduce the switching frequencies of the PWM signal and the PFC signal under light-load and zero-load conditions. Thus, power consumption is greatly reduced. The PFC and the PWM switching signals interleave each other, so that power can be transferred more smoothly from the PFC circuit to the PWM circuit. The saturation of the switching components can be avoided by limiting the maximum on-time of the PWM signal. Further, an external resistor is used to start up the PFC-PWM controller and provide an AC template signal for PFC control.

REFERENCES:
patent: 5982642 (1999-11-01), Herfurth
patent: 6172885 (2001-01-01), Feldtkeller
patent: 6344986 (2002-02-01), Jain et al.
patent: 6717827 (2004-04-01), Ota
patent: 6768655 (2004-07-01), Yang et al.

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