Patent ID: 8792220
Filing Date: 2014-07-29
Classification: H02H

Abstract:
1. A protection circuit comprising: a first input, an over-voltage protector, an over-current protector, and a first output connected in series in that order, the first input configured for receiving a power source, the first output configured for outputting a voltage of the power source to a load circuit, the over-voltage protector configured to cut off an electrical connection between the first input and the first output under the condition that a voltage value of the power source is greater than a predetermined voltage value, the over-current protector configured to cut off an electrical connection between the first input and the first output under the condition that a current value from the first output is greater than a predetermined current value; and wherein the over-voltage protector comprises a second input connected with the first input, an over-voltage detector, a first controller, a first switch, and a second output; the over-current protector comprises a third input connected with the second output, an over-current detector, a second controller, a second switch, and a third output; the third input is connected to the second output, and the third output is connected to the first output; the over-current detector is configured for detecting if a current flowing from the third output is greater than the predetermined current value, and the second controller is configured for turning on or turning off the second switch according to a detecting result from the over-current detector.