Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2008-02-29
2010-11-16
Vu, Bao Q (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S056010, C363S056090
Reexamination Certificate
active
07835162
ABSTRACT:
A power converter and a PWM controller for compensating a maximum output power includes a power switch, an oscillator, a control circuit and a delay modulator. The oscillator generates a pulse signal. The control circuit is coupled to the oscillator for generating a PWM signal and an over current signal in response to the pulse signal and a current sense signal of the power converter. The delay modulator is coupled to the control circuit for generating a delay control signal in response to the PWM signal and the over current signal, wherein the delay control signal is used to prolong a propagation delay time of the control circuit in response to the on-time of the PWM signal, and the propagation delay time can be compensated by the on-time of the PWM signal to limit the maximum output power under a high-line input voltage and a heavy-load condition.
REFERENCES:
patent: 4531096 (1985-07-01), Yokoyama
patent: 7259525 (2007-08-01), Yang
patent: 7564903 (2009-07-01), Yang
patent: 2005/0219870 (2005-10-01), Yang et al.
patent: 2006/0013020 (2006-01-01), Aso
patent: 2007/0091651 (2007-04-01), Jang
Hsu Wei-Li
Lin Chien-Yuan
Gblende Jeffrey
Shih Chun-Ming
System General Corp.
Vu Bao Q
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