Protection circuit and protection method thereof

摘要

The present invention provides a protection circuit. The protection circuit includes an output stage circuit and a feedback unit that generates a first current. Under a first condition that the first current is one of currents larger than and equal to a rated current and the first condition remains for a first period, the feedback unit controls the output stage circuit to restrict the first current. Under a second condition that the first current is one of currents larger than and equal to a restriction current and the second condition remains for a second period, the feedback unit controls the output stage circuit to terminate the first current.

主权项

1. A protection circuit, comprising:
an output stage circuit generating a first current; and a feedback unit, wherein: under a first condition that the first current is larger than or equal to a rated current and the first condition remains for a first period, the feedback unit controls the output stage circuit to restrict the first current; and under a second condition that the first current remains larger than or equal to the rated current after the first current is restricted and the second condition remains for a second period, the feedback unit controls the output stage circuit to terminate the first current, wherein the feedback unit comprises: a measurement unit including a first output terminal to output a first signal therefrom in response to the first current; a first timer unit directly coupled to the first output terminal to receive the first output signal and transmit a second signal to restrict the first current; and a second timer unit directly coupled to the first output terminal to receive the first output signal and transmit a third signal to terminate the first current.