Ripple shaping for switch-mode power supply using number of active phases
AssigneeInfineon Technologies AG
InventorsPawan Garg, Stefan Schumi
Life of this patent
Estimating the term…
Abstract
A controller circuit for a switch-mode power supply (SMPS). The controller circuit is configured to generate, with a plurality of phases, a combined output current at a supply node to supply a load, determine a ripple shaping current complimentary to an estimated ripple at the combined output current using a number of active phases of the plurality of phases that generate the combined output current, and generate, with an auxiliary phase, the ripple shaping current at the supply node to reduce ripple occurring at the combined output current.
Claims11
A controller circuit for a switch-mode power supply (SMPS), the controller circuit being configured to:
- generate, with a plurality of phases, a combined output current at a supply node to supply a load;
- determine a ripple shaping current complimentary to an estimated ripple at the combined output current using a number of active phases of the plurality of phases that generate the combined output current, wherein, to determine the ripple shaping current, the controller circuit is configured to generate a center value using the number of active phases and generate a band of center values using the center value;
- and
- generate, with an auxiliary phase, the ripple shaping current at the supply node to reduce ripple occurring at the combined output current, wherein, to generate the ripple shaping current, the controller circuit is configured to generate the ripple shaping current to be within the band of center values.
A method for controlling a switch-mode power supply (SMPS), the method comprising:
- generating, by controller circuitry, with a plurality of phases, a combined output current at a supply node to supply a load;
- determining, by the controller circuitry, a ripple shaping current complimentary to an estimated ripple at the combined output current using a number of active phases of the plurality of phases that generate the combined output current, wherein determining the ripple shaping current comprises generating a center value using the number of active phases and generating a band of center values using the center value;
- and
- generating, by the controller circuitry, with an auxiliary phase, the ripple shaping current at the supply node to reduce ripple occurring at the combined output current, wherein generating the ripple shaping current comprises generating the ripple shaping current to be within the band of center values.
A switch-mode power supply (SMPS) system comprising:
- a plurality of phases configured to supply a load;
- a supply node;
- a capacitor coupled to the supply node;
- an auxiliary phase configured to reduce ripple occurring at the combined output current;
- and
- a controller circuit configured to:
- generate, with the plurality of phases, a combined output current at the supply node to supply the load;
- determine a ripple shaping current complimentary to an estimated ripple at the combined output current using a number of active phases of the plurality of phases that generate the combined output current, wherein, to determine the ripple shaping current, the controller circuit is configured to generate a center value using the number of active phases and generate a band of center values using the center value;
- and
- generate, with the auxiliary phase, the ripple shaping current at the supply node to reduce ripple occurring at the combined output current, wherein, to generate the ripple shaping current, the controller circuit is configured to generate the ripple shaping current to be within the band of center values.
Dependencies are inferred from the claim text.