Patent ID: 8325052

Claim:
An over-current protection apparatus comprising: a first connector to be connected to a power supply, the first connector comprising a first power pin and a second power pin; a second connector to be connected to a motherboard, the second connector comprising a first power pin; and an over-current protection circuit comprising: a detection circuit comprising a comparator, first to third resistors, and first and second electrical switches each having first to third terminals, wherein a non-inverting input terminal of the comparator is connected to the first power pin of the first connector, an inverting input terminal of the comparator is connected to a first power pin of the second connector, the first terminal of the first electrical switch is connected to an output terminal of the comparator, the second terminal of the first electrical switch is connected to the first terminal of the second electrical switch and also connected to the second power pin of the first connector through the first resistor, the second terminal of the second electrical switch is connected to the second power pin of the first connector through the second resistor, the third resistor is connected between the first power pins of the first and the second connectors, a voltage terminal of the comparator is connected to a third power pin of the first connector; and a control circuit comprising a flip-flop, a third electrical switch with first to third terminals, and a fourth resistor, wherein a clock pin of the flip-flop is connected to the second terminal of the second electrical switch, a first output pin of the flip-flop is connected to the first terminal of the third electrical switch, the second terminal of the third electrical switch is connected to a control pin of the first connector and also connected to the second power pin of the first connector through the fourth resistor, the third terminal of the third electrical switch is connected to a control pin of the second connector, a first voltage pin of the flip-flop is connected to the second power pin of the first connector.