PWM circuit control method

Details PWM circuit control method PWM circuit control method

2007-12-25

2007-12-25

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C318S599000, C318S801000, C318S811000, C323S282000, C323S285000, C327S175000, C363S021100, C363S021110, C363S021180, C363S026000

Reexamination Certificate

active

11159155

ABSTRACT:
In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal. A comparator generates the PWM signals based on a comparative result of the comparative reference value and a count value of the PWM counter. A delay device delays the PWM signal. A switching device switchably outputs the output of the comparator and the output of the delay device in order of time sequence. Thereby, the pulse phase of the PWM signal can be adjusted.

REFERENCES:
patent: 4095165 (1978-06-01), Boros
patent: 5499177 (1996-03-01), Ichihara
patent: 6600295 (2003-07-01), Kanekawa et al.
patent: 2003/0231010 (2003-12-01), Sase et al.
patent: 2004/0196018 (2004-10-01), Sutardja et al.
patent: 2004/0217748 (2004-11-01), Andrews
patent: 10-112982 (1998-04-01), None

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