Piecewise on-time modulation apparatus and method for a...

Details Piecewise on-time modulation apparatus and method for a... Piecewise on-time modulation apparatus and method for a...

2005-03-29

2008-10-14

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021100

Reexamination Certificate

active

07436685

ABSTRACT:
In a power factor corrector including a PWM switch to switch a line current generated from a line voltage to charge a boost capacitor to thereby generate an output voltage, a piecewise on-time modulation apparatus and method comprise comparing a line voltage dependent voltage with an output voltage dependent voltage to generate a comparison signal to determine the on-time of the PWM switch. When the line voltage is lower than a threshold, the on-time of the PWM switch varies with the line voltage, and when the line voltage is higher than the threshold, the on-time of the PWM switch is constant.

REFERENCES:
patent: 5408401 (1995-04-01), Miyazaki
patent: 5742151 (1998-04-01), Hwang
patent: 6118254 (2000-09-01), Faulk
patent: 6172885 (2001-01-01), Feldtkeller
patent: 6646897 (2003-11-01), Lomax et al.
patent: 6657417 (2003-12-01), Hwang
patent: 6703817 (2004-03-01), Cohen
patent: 2003/0222627 (2003-12-01), Hwang

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