Pulse width modulation device with a power saving mode...

Details Pulse width modulation device with a power saving mode... Pulse width modulation device with a power saving mode...

2008-05-27

2008-05-27

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

07378889

ABSTRACT:
A pulse width modulation device with a power saving mode controlled by an output voltage feedback hysteresis circuit is used in a power supply. The present invention comprises a hysteresis comparison circuit extracting a feedback voltage, a high threshold voltage and a low threshold voltage, and the voltages are executed by a comparison and hysteresis operation to a output blanking signal, a PWM control unit extracting a detecting current signal and the feedback voltage to output a modulation signal after a comparison operation is executed; an OR gate circuit connected to the hysteresis comparison circuit and the PWM control unit for receiving the blanking signal and the modulation signal to output a reset signal; and a synchronization signal output unit connected to the OR gate circuit for receiving the reset signal and an oscillation signal to output the drive signal.

REFERENCES:
patent: 5003196 (1991-03-01), Kawaguchi
patent: 5565761 (1996-10-01), Hwang
patent: 5742151 (1998-04-01), Hwang
patent: 5798635 (1998-08-01), Hwang et al.
patent: 6320434 (2001-11-01), Chang et al.
patent: 6429709 (2002-08-01), Hall et al.
patent: 6657417 (2003-12-01), Hwang
patent: 6828836 (2004-12-01), Barrow et al.

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