System and method for reducing output voltage of a power regulator under light load
First Claim
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1. A regulation voltage system for a power supply system comprising:
- a current sense system configured to generate a sense signal that represents an output current of the power supply system that is supplied to a load; and
a positive voltage droop controller configured to provide a regulation voltage to the power supply system, the positive voltage droop controller setting the regulation voltage to one of a predetermined fixed reference voltage or a variable reference voltage based on the sense signal, the variable reference voltage being less than the predetermined fixed reference voltage, wherein the positive droop controller generates a variable positive droop voltage that increases as a function of the output current from approximately a predetermined minimum setpoint voltage to approximately the predetermined reference voltage when the output current is approximately equal to a threshold current, wherein setting a magnitude of the regulation voltage to be less than the predetermined reference voltage comprises setting the magnitude of the regulation voltage to approximately the positive droop voltage.
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Abstract
One embodiment of the invention includes regulation voltage system for a power supply system. The system includes a current sense system configured to generate a sense signal that represents an output current of the power supply system that is supplied to a load. The system also includes a positive voltage droop controller configured to provide a regulation voltage to the power supply system, the positive voltage droop controller setting the regulation voltage to one of a predetermined fixed reference voltage or a variable reference voltage based on the sense signal. The variable reference voltage can be less than the predetermined fixed reference voltage.
12 Citations
17 Claims
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1. A regulation voltage system for a power supply system comprising:
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a current sense system configured to generate a sense signal that represents an output current of the power supply system that is supplied to a load; and a positive voltage droop controller configured to provide a regulation voltage to the power supply system, the positive voltage droop controller setting the regulation voltage to one of a predetermined fixed reference voltage or a variable reference voltage based on the sense signal, the variable reference voltage being less than the predetermined fixed reference voltage, wherein the positive droop controller generates a variable positive droop voltage that increases as a function of the output current from approximately a predetermined minimum setpoint voltage to approximately the predetermined reference voltage when the output current is approximately equal to a threshold current, wherein setting a magnitude of the regulation voltage to be less than the predetermined reference voltage comprises setting the magnitude of the regulation voltage to approximately the positive droop voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for regulating a power supply system, the method comprising:
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supplying a regulated output voltage to a load, the regulated output voltage being proportional to a regulation voltage; measuring a magnitude of an output current that is provided to the load; setting a magnitude of the regulation voltage to be approximately equal to a predetermined reference voltage in response to the measured magnitude of the output current being approximately equal to or greater than a threshold current; and setting the magnitude of the regulation voltage to be less than the predetermined reference voltage in response to the measured magnitude of the output current being less than the threshold current; generating a variable positive droop voltage that increases as a function of the output current from approximately a predetermined minimum setpoint voltage to approximately the predetermined reference voltage when the output current is approximately equal to a threshold current, wherein setting a magnitude of the regulation voltage to be less than the predetermined reference voltage comprises setting the magnitude of the regulation voltage to approximately the positive droop voltage. - View Dependent Claims (10, 11, 12, 13)
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14. A power supply system comprising:
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a switching system configured to regulate an output voltage to a load to be proportional to a regulation voltage in response to a pulse-width modulation (PWM) signal; a current sense system configured to generate a sense signal that is indicative of a magnitude of an output current provided to the load; a PWM system configured to generate the PWM signal in response to the output voltage, the sense signal, and the regulation voltage; and a regulation voltage control system configured to set the regulation voltage at a voltage ranging from a predetermined minimum setpoint voltage to a predetermined reference voltage based on the magnitude of the output current; a positive droop controller generating a variable positive droop voltage that increases as a function of the output current from approximately a predetermined minimum setpoint voltage to approximately the predetermined reference voltage when the output current is approximately equal to a threshold current, wherein setting a magnitude of the regulation voltage to be less than the predetermined reference voltage comprises setting the magnitude of the regulation voltage to approximately the positive droop voltage. - View Dependent Claims (15, 16, 17)
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Specification