Acoustic noise suppression in PFM based buck regulator
AssigneeInfineon Technologies Americas Corp.
InventorsYeshwanth Kaligonahalli Thippeswamy, Ravi Theja Konduru, Hemant Vispute
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Abstract
The present disclosure provides an approach that determines a pulse frequency modulation (PFM) period of a buck regulator. The PFM period comprises a first charging stage and a first discharging stage, and wherein the buck regulator switches from the first discharging stage to the first charging stage based on comparing a feedback voltage to a low threshold voltage. The approach generates a pseudo random pulse at a pseudo random period, wherein the pseudo random period is independent from the low threshold voltage. Then, the approach initiates a transition from a second discharging stage to a second charging stage based on the pseudo random pulse.
Claims22
A method comprising:
- determining a pulse frequency modulation (PFM) period of a buck regulator, wherein the PFM period comprises a first charging stage and a first discharging stage, and wherein the buck regulator switches from the first discharging stage to the first charging stage based on comparing a feedback voltage to a low threshold voltage;
- generating, by a processing device, a pseudo random pulse at a pseudo random period, wherein the pseudo random period is independent from the low threshold voltage;
- and
- initiating a transition from a second discharging stage to a second charging stage based on the pseudo random pulse.
A system comprising:
- a processing device;
- and
- a memory to store instructions that, when executed by the processing device cause the system to:
- determine a pulse frequency modulation (PFM) period of a buck regulator, wherein the PFM period comprises a first charging stage and a first discharging stage, and wherein the buck regulator switches from the first discharging stage to the first charging stage based on comparing a feedback voltage to a low threshold voltage;
- generate a pseudo random pulse at a pseudo random period, wherein the pseudo random period is independent from the low threshold voltage;
- and
- initiate a transition from a second discharging stage to a second charging stage based on the pseudo random pulse.
A power converter, comprising:
- a buck regulator;
- and
- controller circuitry, operatively coupled with the buck regulator, configured to:
- determine a pulse frequency modulation (PFM) period of the buck regulator, wherein the PFM period comprises a first charging stage and a first discharging stage;
- generate a pseudo random pulse at a pseudo random period;
- and
- comparator circuitry to initiate a transition from a second discharging stage to a second charging stage based on the pseudo random pulse.
Dependencies are inferred from the claim text.