Patent ID: 7339775

Claim:
An overcurrent protection circuit, comprising: an output control device including a control terminal for controlling power between an input terminal and an output terminal of the overcurrent protection circuit; a first comparator, connected to the control terminal of the output control device, for comparing a reference voltage with a voltage of the output terminal of the overcurrent protection circuit and outputting a comparison result; first and second detection devices, each of which includes a control terminal that receives the comparison result, for detecting a proportional current value that is proportional to current flowing through the output control device; a second comparator, connected to an output terminal of the first detection device, for comparing the proportional current value with a first reference current value provided by a first current source; a first control device, connected to an output terminal of the second comparator, for controlling a voltage of the control terminal of the output control device; a second current source, connected to an output terminal of the second detection device, for providing a second reference current value; a third comparator for comparing a voltage of the output terminal of the second detection device with a voltage of an output terminal of the output control device; and a second control device, connected to an output terminal of the third comparator, for controlling a voltage of the control terminal of the output control device.