Patent ID: 7259950

Claim:
A load-protection control circuit of power supply, wherein said power supply comprises: a power transformation circuit, which outputs a direct current to drive loads; a control circuit, which is used to switch said power transformation circuit; said power transformation circuit including a signal amplifier and comparator and said control circuit being electrically coupted to a power-protection circuit that has a voltage representing reference power, and wherein said power-protection circuit compares the direct current voltage from said power transformation circuit, which drives said loads, with said voltage representing reference power and generates an output signal to said control circuit in order to switch said power transformation circuit off, wherein said power-protection circuit and said control circuit are electrically coupled through a switcher circuit, which is selectively switched by a manual external switch to be in an open-circuit or a close-circuit state to select a protection function of the power supply whereby said protection signal is transmitted to said control circuit in a close-circuit state.