Varying operation of a voltage regulator, and components thereof, based upon load conditions
First Claim
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1. A controller for a voltage regulator, comprising:
- a first controller to generate a first signal to drive a first switch of the voltage regulator;
a first inductor coupled to an output of the first switch;
a second controller to generate a second signal to drive a second switch of the voltage regulator;
a second inductor coupled to an output of the second switch, the first inductor and the second inductor inductively coupled;
anda comparator coupled to an output of the voltage regulator, an input of the first controller and an input of the second controller, wherein the comparator is operable to determine if a light-load condition exists, and if a light-load condition exists, generate a third signal to adjust a phase difference between the first signal and the second signal so that the first signal and the second signal are approximately in-phase.
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Abstract
A method for operating a voltage regulator controller, for use in a voltage regulator including coupled inductors, is provided as follows. A first signal is generated for driving a first switch of the voltage regulator. A second signal is generated driving a first switch of the voltage regulator. The voltage regulator determines whether a light-load condition exists. Upon determining the existence of a light-load condition, adjusting the phase difference between said first and second signals so that the first and second signals are approximately in-phase.
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Citations
32 Claims
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1. A controller for a voltage regulator, comprising:
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a first controller to generate a first signal to drive a first switch of the voltage regulator; a first inductor coupled to an output of the first switch; a second controller to generate a second signal to drive a second switch of the voltage regulator; a second inductor coupled to an output of the second switch, the first inductor and the second inductor inductively coupled;
anda comparator coupled to an output of the voltage regulator, an input of the first controller and an input of the second controller, wherein the comparator is operable to determine if a light-load condition exists, and if a light-load condition exists, generate a third signal to adjust a phase difference between the first signal and the second signal so that the first signal and the second signal are approximately in-phase. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A voltage regulator, comprising:
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a first controller to generate a first signal; a second controller to generate a second signal; a switch to receive the first signal at a first input and the second signal at a second input; a first inductor coupled to a first output of the switch; a second inductor coupled to a second output of the switch, the first inductor and second inductor inductively coupled; and a comparator, a first input of the comparator coupled to receive a signal indicative of a current in the first inductor and a signal indicative of a current in the second inductor, a second input of the comparator coupled to receive a threshold current signal, and an output of the comparator coupled to a third input of the switch, wherein the comparator is operable to compare a value of the signal indicative of the current in the first inductor and the signal indicative of the current in the second inductor with a value of the threshold current signal to determine if a light-load condition exists, and if a light-load condition exists, generate a third signal to cause the switch to switch at least one of the first signal and the second signal so that a signal at the first output of the switch is approximately in-phase with a signal at the second output of the switch. - View Dependent Claims (8, 9, 10, 11)
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12. A system, comprising:
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a voltage regulator; a power source coupled to an input of the voltage regulator; and a load coupled to an output of the voltage regulator, the voltage regulator including; a first controller to generate a first signal to drive a first switch of the voltage regulator; a first inductor coupled to an output of the first switch; a second controller to generate a second signal to drive a second switch of the voltage regulator; a second inductor coupled to an output of the second switch, the first inductor and the second inductor inductively coupled;
anda comparator coupled to an output of the voltage regulator, an input of the first controller and an input of the second controller, wherein the comparator is operable to determine if a light-load condition exists, and if a light-load condition exists, generate a third signal to shift a phase of at least one of the first signal and the second signal so that a phase difference between the first signal and the second signal is approximately zero degrees. - View Dependent Claims (13, 14)
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15. A method for controlling a voltage regulator, comprising:
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generating a first drive signal for a first phase of the voltage regulator; generating a second drive signal for a second phase of the voltage regulator; sensing a first current flowing through the first phase of the voltage regulator; sensing a second current flowing through the second phase of the voltage regulator; summing the first sensed current and the second sensed current; comparing a value of the sum with a threshold value; and if the sum is less than the threshold value, adjusting a phase difference between the first drive signal and the second drive signal so that the first drive signal and the second drive signal are approximately in-phase. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system, comprising:
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a voltage regulator having at least two phases and at least two inductively-coupled inductors in the at least two phases; a power source coupled to an input of the voltage regulator; and a load coupled to an output of the voltage regulator, the voltage regulator including; a first controller to generate a first signal; a second controller to generate a second signal; and a comparator coupled to an output of the voltage regulator, wherein the comparator is operable to determine if a light-load condition exists, and if a light-load condition exists, generate a third signal so that that the voltage regulator uses at least one of the first signal and the second signal to provide in-phase signals to drive the at least two phases including the at least two inductively-coupled inductors and provide the output for the load. - View Dependent Claims (22, 23)
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24. A method for controlling a voltage regulator having at least two phases, comprising:
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generating a first drive signal for the voltage regulator; generating a second drive signal for the voltage regulator; sensing a first current flowing through a first inductor in a first phase of the voltage regulator; sensing a second current flowing through a second inductor in a second phase of the voltage regulator, the first inductor and the second inductor inductively coupled; responsive to the sensing the first current and the second current, determining whether a light-load condition exists; and if a light load condition exists, driving the at least two phases utilizing the first drive signal and the second drive signal so that the first drive signal and the second drive signal are approximately in-phase.
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25. A method for controlling a multi-phase coupled-inductor voltage converter, comprising:
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generating a plurality of signals utilized for driving a plurality of phases of the multi-phase coupled-inductor voltage converter; determining whether a light-load condition exists; and if a light load condition exists, driving the plurality of phases so that the plurality of signals are approximately in-phase. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification