PWM control circuit for the post-adjustment of multi-output...

Details PWM control circuit for the post-adjustment of multi-output... PWM control circuit for the post-adjustment of multi-output...

2005-04-26

2005-04-26

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S288000, C323S299000, C363S089000

Reexamination Certificate

active

06885176

ABSTRACT:
A multi-output switching power supply may include a PWM regulator circuit arranged in cascade upstream of each output to receive, as an input, a square wave voltage signal with a predetermined duty cycle. The regulator circuit may include an auxiliary switching device for modulating the duty cycle of the input signal to supply, as an output, a regulated direct current voltage. A control circuit for the PWM regulator circuit may include a detector circuit for detecting the trailing edges of the voltage signal input to the regulator circuit which emits a pulse coinciding with each of the trailing edges. The control circuit may also include a ramp signal generator that is controlled by the emitted pulses. The ramp signal generator may be connected to the non-inverting input of a comparator having an inverting input for receiving a signal indicative of the error in the regulator output voltage.

REFERENCES:
patent: 4823070 (1989-04-01), Nelson
patent: 5424932 (1995-06-01), Inou et al.
patent: 6130828 (2000-10-01), Rozman
patent: 6222747 (2001-04-01), Rinne et al.
patent: 6239994 (2001-05-01), Abdoulin
patent: 6452369 (2002-09-01), Lang
patent: 6788554 (2004-09-01), Havanur
UNITRODE Corporation, Texas Instruments Incorporated, 1999, “Switch Mode Secondary Side Post Regulator”, Nov. 1999.

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