Overload protection delay circuit for switching power supply

Details Overload protection delay circuit for switching power supply Overload protection delay circuit for switching power supply

2007-03-30

2010-11-02

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C363S021150, C323S902000

Reexamination Certificate

active

07826239

ABSTRACT:
Disclosed is an overload protection delay circuit for use in a switching power supply for enabling the switching power supply to detect overload problems with high accuracy. The overload protection delay circuit is connected between a photo coupler and a pulse-width modulator of the switching power supply, and is consisted of an energy storage device such as a capacitor and a charging controller such as a zener diode. The charging controller is configured to set a limit value for allowing the energy storage device to be charged by an internal current source of the pulse-width modulator when the feedback signal of the switching power supply reaches the limit value. By charging the energy storage device, a time delay is added to the feedback signal so that the pulse-width modulator can accurately activate the internal overload protection mechanism without the interference of load transients.

REFERENCES:
patent: 6483725 (2002-11-01), Schetters et al.
patent: 7551464 (2009-06-01), Chen

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