PWM controller having drive control with input voltage...

Details PWM controller having drive control with input voltage... PWM controller having drive control with input voltage...

2007-12-12

2011-11-15

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C361S092000, C323S299000

Reexamination Certificate

active

08059432

ABSTRACT:
In one embodiment, a PWM controller includes a circuit operably coupled to inhibit a drive signal responsively to a bulk input voltage remaining at a low value for a time interval and to re-enable the drive signal subsequently to the time interval responsively to the bulk input voltage increasing to greater than the first value subsequently to the time interval. In another embodiment, a method of forming a PWM controller includes configuring the PWM controller to use a clock signal to form a drive signal and to sense a bulk input voltage decreasing to no greater than a first value and to disable the drive signal without disabling the clock signal responsively to the bulk input voltage remaining no greater than the first value for a time interval.

REFERENCES:
patent: 4709320 (1987-11-01), Konopka
patent: 4791544 (1988-12-01), Gautherin et al.
patent: 5907224 (1999-05-01), Yamashita et al.
patent: 6597221 (2003-07-01), Hall et al.
patent: 6744645 (2004-06-01), Balakrishnan et al.
patent: 6914793 (2005-07-01), Balakrishnan et al.
patent: 2007/0007937 (2007-01-01), Park et al.
Data Sheet, “NCP1231 Low-Standby Power High Performance PWM Controller”, Copyright Jun. 2004—Rev. 1, Semiconductor Components Industries, LLC., 20 pages.
Data Sheet, FAN7602B Green Current-Mode PWM Controller, Mar. 2007, Copyright 2007 Fairchild Semiconductor Corporation, FAN7602B Rev. 1.0.0, 17 pages.

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