Active ripple reduction switched mode power supplies
AssigneeRF Micro Devices, Inc.
InventorMichael R. Kay
Life of this patent
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Abstract
A system and method are provided for actively reducing ripple in a supply voltage provided by a switched mode power supply. In general, active ripple reduction circuitry operates to sense the ripple in the supply voltage to provide a signal indicative of the ripple. The signal indicative of the ripple is inverted and provided to the output of the switched mode power supply to substantially reduce or eliminate the ripple in the supply voltage.
Claims20
A system comprising:
- a) a switched mode power supply;
- and
- b) active ripple reduction circuitry adapted to:
- i) sense an output ripple of the switched mode power supply;
- ii) provide a ripple reduction signal inversely related to the output ripple;
- and
- iii) provide the ripple reduction signal to an output of the switched mode power supply, thereby combining the ripple reduction signal and the output ripple such that the output ripple is substantially reduced.
A method for actively reducing an output ripple in a supply voltage provided by a switched mode power supply comprising:
- sensing the output ripple of the switched mode power supply;
- providing a ripple reduction signal inversely related to the output ripple;
- and
- providing the ripple reduction signal to an output of the switched mode power supply, thereby combining the ripple reduction signal and the output ripple such that the output ripple is substantially reduced.
A system for actively reducing an output ripple in a supply voltage provided by a switched mode power supply comprising:
- means for sensing the output ripple of the switched mode power supply;
- means for providing a ripple reduction signal inversely related to the output ripple;
- and
- means for providing the ripple reduction signal to an output of the switched mode power supply, thereby combining the ripple reduction signal and the output ripple such that the output ripple is substantially reduced.
Dependencies are inferred from the claim text.