Power supply circuit and control method thereof
AssigneeRealtek Semiconductor Corp.
InventorLi Cheng Chu
Life of this patent
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Abstract
A power supply circuit includes a voltage generator circuit, an overcurrent protection circuit, and a power switch circuit. The voltage generator circuit is configured to generate a first voltage. The overcurrent protection circuit is configured to generate a comparison voltage according to a reference voltage and a sensing voltage. A voltage clamping circuit in the overcurrent protection circuit is configured to generate a second voltage according to the first voltage and the comparison voltage. The power switch circuit is configured to generate an output current according to the second voltage and an input voltage. The sensing voltage is generated at a node in the power switch circuit and is associated with the output current.
Claims20
A power supply circuit, comprising:
- a voltage generator circuit configured to generate a first voltage;
- an overcurrent protection circuit configured to generate a comparison voltage according to a reference voltage and a sensing voltage, wherein the overcurrent protection circuit comprises:
- a voltage clamping circuit configured to generate a second voltage according to the first voltage and the comparison voltage;
- and
- a power switch circuit configured to generate an output current according to the second voltage and an input voltage, wherein the sensing voltage is generated at a node in the power switch circuit and is associated with the output current.
A control method of a power supply circuit, comprising:
- generating, by a voltage generator circuit, a first voltage;
- generating, by an overcurrent protection circuit, a comparison voltage according to a reference voltage and a sensing voltage;
- generating, by a voltage clamping circuit in the overcurrent protection circuit, a second voltage according to the first voltage and the comparison voltage;
- and
- generating, by a power switch circuit, an output current according to the second voltage and an input voltage, wherein the sensing voltage is generated at a node in the power switch circuit and is associated with the output current.
Dependencies are inferred from the claim text.