Power supply device, method for controlling the power supply device, and electronic apparatus
First Claim
1. A power supply device, comprising:
- a first power supplying part which produces a first voltage;
a second power supplying part which produces a second voltage, the second power supplying part having an output current capacity smaller than the first power supplying part;
a comparator for comparing a magnitude of the first voltage and a magnitude of the second voltage with each other; and
voltage control signal generation means for generating a voltage control signal on the basis of the comparison, whereinthe second power supplying part controls a voltage value of the second voltage so as to bring the voltage value of the second voltage closer to a voltage value of the first voltage in response to the voltage control signal.
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Accused Products
Abstract
Provided are a power supply device capable of producing a highly-accurate supply voltage at low power consumption, a method for controlling the power supply device, and an electronic apparatus in which the power supply device is incorporated. The power supply device includes a first power supplying part and a second power supplying part which has less output current capacity than the first power supplying part does. The power supply device is configured to control the voltage value of the second voltage produced in the second power supplying part in order to make the first voltage produced in the first power supplying part equal to the second voltage produced in the second power supplying part.
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Citations
18 Claims
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1. A power supply device, comprising:
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a first power supplying part which produces a first voltage; a second power supplying part which produces a second voltage, the second power supplying part having an output current capacity smaller than the first power supplying part; a comparator for comparing a magnitude of the first voltage and a magnitude of the second voltage with each other; and voltage control signal generation means for generating a voltage control signal on the basis of the comparison, wherein the second power supplying part controls a voltage value of the second voltage so as to bring the voltage value of the second voltage closer to a voltage value of the first voltage in response to the voltage control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling a power supply device, the power supply device including a first power supplying part for producing a first voltage, and a second power supplying part for producing a second voltage and having an output current capacity smaller than the first power supplying part, the method comprising:
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comparing a magnitude of the first voltage and a magnitude of the second voltage with each other; and providing control so that a voltage value of the second voltage is brought closer to a voltage value of the first voltage. - View Dependent Claims (13, 14, 15, 16)
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17. An electronic apparatus including an active mode in which a first load is in an operating state and a sleep mode in which the first load is at a stopped state, the electronic apparatus comprising:
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a first power supplying part which produces a first voltage and supplies power to the first load while maintaining an activated state during the active mode, and stops producing the first voltage during the sleep mode and stopping supplying power to the first load; a second power supplying part which produces a second voltage and supplies power to a second load, the second power supplying part having an output current capacity smaller than the first power supplying part; a comparator for comparing a magnitude of the first voltage and a magnitude of the second voltage with each other; and voltage control signal generation means for generating a voltage control signal on the basis of a result of the comparison, wherein the second power supplying part controls a voltage value of the second voltage so as to bring the voltage value of the second voltage closer to a voltage value of the first voltage in response to the voltage control signal. - View Dependent Claims (18)
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Specification