Pulse width modulation method and apparatus

Details Pulse width modulation method and apparatus Pulse width modulation method and apparatus

2007-11-27

2007-11-27

Kinkead, Arnold (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

C332S109000, C327S172000, C327S175000, C327S176000

Reexamination Certificate

active

11089423

ABSTRACT:
Disclosed is a pulse width modulation method and apparatus capable of expressing as many values as possible in a pulse width modulation (PWM) period, while maintaining the center of pulse energy substantially equal to the center of the PWM period. For this end, prepared is the PWM pattern generator20including 2 kinds of PWM pulse generator21and22for generating pulses having the pulse width of 0˜N times of the reference clock period in 1 PWM period corresponding to a predetermined number N of the reference clock period. The PWM pulse generators21and22are properly switched by the switching circuit30under control of the control circuit40for performing time averaging process so that the centers of energy of the output pulses is substantially equal to the center of the PWM period.

REFERENCES:
patent: 7084613 (2006-08-01), Harris et al.
patent: 63-176020 (1988-07-01), None
patent: 07-094965 (1995-04-01), None
patent: 10-303657 (1998-11-01), None
patent: 2003-198373 (2003-07-01), None

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