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US 2012/0235658 A1Published application
Power reduction of a power supply unit at light loading or no loading
AssigneeRichtek Technology Corporation
InventorsKUO-CHI LIU, FU-SHENG TSAI, CHUNG-CHENG CHANG, KUANG-FENG LI, YEN-TE LEE
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Abstract
A power supply unit includes a switching power converter responsive to a control signal to switch a power switch thereof to provide an output voltage and an output current for a load. To reduce light-load or no-load power consumption of the power supply unit, the power supply unit repeats a process of stopping switching the power switch and recovering switching the power switch for a period of time once the output voltage decreases to be lower than a reference voltage.
Claims14
A power supply unit, comprising:
- a switching power converter responsive to a control signal to switch a power switch thereof to provide an output voltage and an output current for a load;
- a controller coupled to the switching power converter to provide the control signal;
- a load detector coupled to the switching power converter or the controller, detecting a load condition to generate a first signal;
- a voltage detector coupled to the switching power converter, detecting the output voltage and comparing the output voltage with a reference voltage to generate a second signal;
- and
- a disable circuit coupled to the load detector, the voltage detector and the controller, determining a third signal according to the first signal and the second signal to signal the controller to stop switching the power switch.
3 more elements
A method for a power supply unit, comprising steps of:
- A.) switching a power switch in response to a control signal to provide an output voltage and an output current for a load;
- B.) detecting a load condition to generate a first signal;
- C.) detecting the output voltage and comparing the output voltage with a reference voltage to generate a second signal;
- and
- D.) determining a third signal according to the first signal and the second signal to stop switching the power switch.
2 more elements
Dependencies are inferred from the claim text.