Reverse current protection circuit
AssigneeAnpec Electronics Corporation
InventorSHIH-CHUNG WEI
Life of this patent
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Abstract
A reverse current protection circuit is applicable to a high-side switch and a low-side switch. A first terminal of the high-side switch is coupled to an input voltage. A first terminal of the low-side switch is connected to a second terminal of the high-side switch. The reverse current protection circuit detects the input voltage received by the first terminal of the high-side switch and an output voltage of a second terminal of the low-side switch, and accordingly controls the low-side switch. Before a reverse current being larger than a reverse current threshold flows from the output voltage of the second terminal of the low-side switch sequentially through the low-side switch and the high-side switch to the input voltage, the reverse current protection circuit turns off the low-side switch.
Claims18
A reverse current protection circuit, which is applicable to a high-side switch and a low-side switch, wherein a first terminal of the high-side switch is coupled to an input voltage, a control terminal of the high-side switch is coupled to a high-side charging voltage, and a first terminal of the low-side switch is connected to a second terminal of the high-side switch, the reverse current protection circuit comprising:
- a main reverse current protecting circuit connected to a control terminal of the low-side switch, configured to detect the input voltage received by the first terminal of the high-side switch and an output voltage of a second terminal of the low-side switch, and configured to control the low-side switch according to the input voltage and the output voltage;
- wherein, before a reverse current being larger than a reverse current threshold flows from the output voltage of the second terminal of the low-side switch sequentially through the low-side switch and the high-side switch to the input voltage, the main reverse current protecting circuit turns off the low-side switch.
Dependencies are inferred from the claim text.