Pulse width modulator with two-way integrator

Details Pulse width modulator with two-way integrator Pulse width modulator with two-way integrator

2011-06-21

2011-06-21

Mis, David (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Pulse width modulator

C363S021110

Reexamination Certificate

active

07965151

ABSTRACT:
A pulse width modulator (PWM) includes a driver and a two-way integrator. The driver is coupled to output a first and a subsequent period of a PWM signal. Both the first and the subsequent periods include the PWM signal changing between first and second states. The two-way integrator is coupled to integrate an input current and coupled to generate a duty ratio signal in response to integrating the input current. The driver determines a duty factor of both the first and the subsequent periods by setting the PWM signal to the second state in response to the duty ratio signal. The two-way integrator includes a capacitor that integrates the input current during the first period by charging the capacitor and integrates the input current during the subsequent period by discharging the capacitor.

REFERENCES:
patent: 4450415 (1984-05-01), Gontowski, Jr.
patent: 6229362 (2001-05-01), Choi
patent: 2010/0097828 (2010-04-01), Chen
U.S. Appl. No. 12/477,010, filed Jun. 2, 2009, Roland S. Saint-Pierre.
U.S. Appl. No. 12/477,058, filed Jun. 2, 2009, David Kung et al.

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