Voltage regulator with nonlinear adaptive voltage position and control method thereof
AssigneeMonolithic Power Systems, Inc.
InventorsChao Liu, Daocheng Huang, Cong Deng
Life of this patent
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Abstract
A voltage regulator has a switching circuit and a control circuit. The switching circuit provides an output voltage and an output current. The control circuit provides a switching control signal to the switching circuit to adjust the output voltage, such that the output voltage decreases with a first slope as the output current increases when the output current is less than a predetermined current, the output voltage decreases with a second slope as the output current increases when the output current is larger than the predetermined current.
Claims18
A control circuit for a voltage regulator, the voltage regulator is configured to receive an input voltage and provide an output voltage and an output current, the control circuit comprising:
- a voltage generator, configured to receive a first signal with a first slope, a second signal with a second slope, the input voltage and the output voltage, and is further configured to provide a first feedback signal in response to the output voltage, the output current and the first signal with the first slope, and configured to provide a second feedback signal in response to the output voltage, the output current and the second signal with the second slope;
- a compare circuit, configured to provide a first comparison signal by comparing the first feedback signal with a first reference signal, and configured to provide a second comparison signal by comparing the second feedback signal with a second reference signal;
- and
- a logic circuit, configured to generate a set signal based on the first comparison signal and the second comparison signal;
- wherein
- the control circuit is configured to adjust the output voltage based on the set signal, such that the output voltage decreases with the first slope as the output current increases when the output current is less than a predetermined current, and the output voltage decreases with the second slope as the output current increases when the output current is larger than the predetermined current.
A voltage regulator, comprising:
- a switching circuit, configured to receive an input voltage and provide an output voltage and an output current;
- a voltage generator, configured to provide a first feedback signal in response to the output voltage, the output current and a first signal with a first slope, and configured to provide a second feedback signal in response to the output voltage, the output current and a second signal with a second slope;
- a first comparator, configured to provide a first comparison signal by comparing the first feedback signal with a first reference voltage;
- a second comparator, configured to provide a second comparison signal by comparing the second feedback signal with a second reference voltage;
- and
- a switching control circuit, configured to provide a switching control signal to turn on the switching circuit based on a set signal to adjust the output voltage, such that the output voltage decreases with the first slope as the output current increases when the output current is less than a predetermined current, and the output voltage decreases with the second slope as the output current increases when the output current is larger than the predetermined current;
- wherein
- the set signal is configured to be generated in response to the first comparison signal and the second comparison signal.
A control method used in a voltage regulator, the voltage regulator is configured to receive an input voltage and provide an output voltage and an output current, the control method comprising:
- sensing the output current and the output voltage;
- generating a first feedback signal in response to the output voltage, the output current and a first signal with a first slope, and generating a first comparison signal by comparing the first feedback signal with a first reference voltage;
- generating a second feedback signal in response to the output voltage, the output current and a second signal with a second slope, and generating a second comparison signal by comparing the second feedback signal with a second reference voltage;
- generating a set signal based on the first comparison signal and the second comparison signal;
- and
- adjusting the output voltage based on the set signal, such that the output voltage decreases with the first slope as the output current increases when the output current is less than a predetermined current, and the output voltage decreases with the second slope as the output current increases when the output current is larger than the predetermined current.
Dependencies are inferred from the claim text.