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AssigneeDelta Electronics (Thailand) Public Co., Ltd.
InventorsChalermkiat Tepsumran, Allwyn Jacob D. Cunha, Apinun Pomta
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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.
An overload protection delay circuit for adding a time delay to a feedback signal of the switching power supply when the feedback signal of the switching power supply reaches a limit value being smaller than a threshold value set to activate an overload protection mechanism of the switching power supply, wherein the switching power supply includes a switching controller and a coupling device for coupling the feedback signal to the switching controller, the overload protection delay circuit comprising:
A switching power supply comprising:
Dependencies are inferred from the claim text.