Power delivery system having cascaded buck stages
AssigneeNXP B.V.
InventorPeng Xu
Life of this patent
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Abstract
A power delivery system for a microprocessor or other ASIC. The power delivery system includes a plurality of cascaded buck stages connected in series, wherein a last buck stage in the plurality of cascaded buck stages provides an output voltage Vo in response to an input voltage Vin applied to a first buck stage of the plurality of cascaded stages. A duty cycle control regulates a duty cycle of each buck stage to maintain the output voltage Vo. The duty cycle control sets the duty cycle of the first buck stage of the plurality of cascaded buck stages to 1 if an input-to-output voltage ratio (Vin/Vo) is lower than a threshold input-to-output voltage ratio RT.
Claims20
A power delivery system, comprising:
- a plurality of cascaded buck stages connected in series, wherein a last buck stage in the plurality of cascaded buck stages provides an output voltage Vo in response to an input voltage Vin applied to a first buck stage of the plurality of cascaded stages;
- and
- a duty cycle control for controlling a duty cycle of each buck stage to maintain the output voltage Vo, wherein the duty cycle control sets the duty cycle of the first buck stage of the plurality of cascaded buck stages to 1 if an input-to-output voltage ratio (Vin/Vo) is lower than a threshold input-to-output voltage ratio RT.
A method for power delivery, comprising:
- connecting a plurality of cascaded buck stages in series, wherein a last buck stage in the plurality of cascaded buck stages provides an output voltage Vo in response to an input voltage Vin applied to a first buck stage of the plurality of cascaded stages;
- and
- controlling a duty cycle of each buck stage to maintain the output voltage Vo, wherein the duty cycle of the first buck stage of the plurality of cascaded buck stages is set to 1 if an input-to-output voltage ratio (Vin/Vo) is lower than a threshold input-to-output voltage ratio RT.
A quasi-single-stage power delivery system, comprising:
- first and second cascaded buck stages connected in series, wherein the second buck stage provides an output voltage Vo in response to an input voltage Vin applied to the first buck stage;
- and
- a duty cycle control for controlling duty cycles of the first and second buck stages to maintain the output voltage Vo, wherein the duty cycle of the first buck stage is set to 1 if an input-to-output voltage ratio (Vin/Vo) is lower than a threshold input-to-output voltage ratio RT, and wherein the duty cycle of the first buck stage is set to a value less than 1 if the input-to-output voltage ratio (Vin/Vo) is higher than the threshold input-to-output voltage ratio RT.
Dependencies are inferred from the claim text.