Switching mode power supply and method for determining a compensation factor thereof
AssigneeRichtek Technology Corporation
InventorWei-Hsu Chang
Life of this patent
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Abstract
A switching mode power supply is configured to have two modes, a normal mode and a measure mode. To determine a compensation factor to compensate the switching mode power supply in the normal mode, the switching mode power supply is switched to the measure mode to measure a frequency response of the switching mode power supply, by which the switching mode power supply is accurately compensated and optimized.
Claims21
A switching mode power supply operative in a normal mode and a measure mode, comprising:
- an output stage;
- and
- a controller for driving the output stage to produce an output voltage;
- wherein the controller compensates the switching mode power supply with a first compensation factor in the measure mode so as to measure a frequency response of the switching mode power supply for determining a second compensation factor which is used to compensate the switching mode power supply in the normal mode.
A method for determining a compensation factor for a switching mode power supply operative in a normal mode and a measure mode, comprising the steps of:
- switching the switching mode power supply to the measure mode;
- providing a small signal voltage;
- driving an output stage of the switching mode power supply according to the small signal voltage and a first compensation factor, for producing an output voltage;
- and
- deriving a frequency response of the switching mode power supply from the output voltage for determining a second compensation factor which is used to compensate the switching mode power supply in the normal mode.
Dependencies are inferred from the claim text.