Controlling a power supply
AssigneeTeradyne, Inc.
InventorsPoh Keong Ng, Benjamin Fisher
Life of this patent
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Abstract
An example system includes a switched mode power supply to provide an output voltage. The output voltage includes a predefined voltage and a droop or kick voltage that deviates from the predefined voltage. Control circuitry is configured to control the switched mode power supply based on a first voltage and a second voltage to reduce the droop or kick voltage at least partly. The control circuitry includes first circuitry including digital circuitry configured to obtain the first voltage based on the output voltage, and second circuitry including analog circuitry configured to obtain the second voltage based on the output voltage.
Claims19
A system comprising:
- a switched mode power supply to provide an output voltage, the output voltage comprising a predefined voltage and a droop or kick voltage that deviates from the predefined voltage;
- and
- control circuitry configured to control the switched mode power supply based on a first voltage and a second voltage to reduce the droop or kick voltage at least partly, the control circuitry comprising:
- first circuitry comprising digital circuitry configured to obtain the first voltage based on the output voltage, the first circuitry comprising feedback circuitry;
- and
- second circuitry comprising analog circuitry configured to obtain the second voltage based on the output voltage, the second circuitry comprising feedforward circuitry.
A system comprising:
- a switched mode power supply to provide an output voltage, the output voltage comprising a predefined voltage and a droop or kick voltage that deviates from the predefined voltage;
- and
- control circuitry configured to control the switched mode power supply based on a first voltage and a second voltage to reduce the droop or kick voltage at least partly, the control circuitry comprising:
- first circuitry comprising digital circuitry configured to obtain the first voltage based on the output voltage;
- and
- second circuitry comprising analog circuitry configured to obtain the second voltage based on the output voltage;
- wherein the first circuitry comprises a proportional-integral-derivative (PID) controller, the PID controller being configured to receive the output voltage and to output a third voltage that is based on the output voltage and a reference voltage, the first voltage being based on the third voltage;
- wherein the system further comprises an inverting summing amplifier configured to sum a version of the first voltage and the second voltage to produce a summed voltage, the control circuitry to control the switched mode power supply using the summed voltage;
- wherein the second circuitry comprises a notch filter to remove undesired switched mode power supply ripple voltage and to output a fourth voltage;
- wherein the second circuitry comprises at least one non-inverting differentiator configured to differentiate the fourth voltage to produce the second voltage, the second voltage comprising a version of the fourth voltage having an increased slope;
- and
- wherein the at least one non-inverting differentiator comprises two or more non-inverting differentiators each configured to differentiate the fourth voltage to produce a respective second voltage, each respective second voltage being based the fourth voltage and having an increased slope relative to the fourth voltage.
The system of 11, wherein the at least one inverting differentiator comprises two or more inverting differentiators each configured to differentiate the fourth voltage to produce a respective second voltage, each respective second voltage being based the fourth voltage and having an increased slope relative to the fourth voltage.
A method comprising:
- generating an output voltage using a switched mode power supply, the output voltage comprising a predefined volage and a droop or kick voltage that deviates from the predefined voltage;
- obtaining a first voltage using feedback circuitry that is digital, the first voltage being based on the output voltage, the first voltage being obtained at a first speed;
- obtaining a second voltage using feedforward circuitry that is analog, the second voltage being based on the output voltage, the second voltage being obtained at a second speed that is greater than the first speed;
- and
- controlling the switched mode power supply based on the first voltage and the second voltage to counteract the droop or kick voltage at least partly.
Dependencies are inferred from the claim text.