Patent ID: 11860709
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A power supply method having power limiting mechanism used in a power supply apparatus, comprising:
controlling a switch transistor electrically coupled in series with a powered device by a control voltage to form a conduction path when being conducted such that a power supply unit supplies a power to the powered device, wherein the switch transistor has an operation current, an operation voltage and an operation power when being conducted;
detecting the operation voltage by a voltage detection circuit;
performing analog-to-digital conversion on the operation voltage by an analog-to-digital conversion circuit of a power-limiting circuit;
generating a current-limiting signal related to a current-limiting value by a calculation circuit of the power-limiting circuit according to the operation voltage based on a predetermined voltage-current curve, wherein the predetermined voltage-current curve limits the operation power to be not larger than a predetermined value;
performing digital-to-analog conversion on the current-limiting signal to generate a reference voltage by a digital-to-analog conversion circuit of the power-limiting circuit; and
receiving the reference voltage and performing comparison with a feedback voltage generated according to the operation current by a current-limiting circuit to generate the control voltage accordingly to control the switch transistor, so as to keep the operation current at the current-limiting value.