Method for improving efficiency of power converter
AssigneeMediatek Inc.
InventorsChao-Chang Chiu, Kuo-Chun Hsu
Life of this patent
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Abstract
The invention provides a method for improving efficiency of a power converter which may include a switch coupled between a power source and a middle node, and may supply an inductor current at the middle node to result in an output voltage and a load current. The method may comprise: during an intermediate mode, controlling the inductor current to ripple with peaks at a peak current threshold and valleys which may vary as the load current varies.
Claims19
A method for improving efficiency of a power converter which comprises a switch coupled between a power source and a middle node, and supplies an inductor current at the middle node to result in an output voltage and a load current;
- the method comprising:
- during an intermediate mode, controlling the inductor current to ripple with peaks at a peak current threshold and valleys which vary as the load current varies;
- entering the intermediate mode from a light-load mode;
- and
- entering a heavy-load mode from the intermediate mode when an on-time for the switch to remain on is shorter than a predetermined on-time threshold.
A method for improving efficiency of a power converter;
- the power converter supplying an inductor current at a middle node to result in an output voltage and a load current, and the power converter comprising a switch coupled between a power source and the middle node;
- the method comprising:
- during an intermediate mode, turning on the switch to conduct the power source to the middle node, and turning off the switch to stop conducting the power source to the middle node when the inductor current reaches a peak current threshold;
- and
- during the intermediate mode, after turning off the switch, determining when to stop turning off the switch according to an amount of an error between a reference voltage and the output voltage;
- and
- entering a heavy-load mode from the intermediate mode when an on-time for the switch to remain on is shorter than a predetermined on-time threshold.
Dependencies are inferred from the claim text.