POWER SUPPLY APPARATUS AND POWER SUPPLY METHOD
First Claim
Patent Images
1. A power supply apparatus comprising:
- a series regulator that generates and outputs output voltage in accordance with an output target voltage;
a switching regulator that generates and outputs output voltage in accordance with an output target voltage; and
a control apparatus that switches between the series regulator and the switching regulator according to the settings of the output target voltages, wherein;
the output of the series regulator and the output of the switching regulator are connected; and
the control apparatus, when in a stationary state, sets the output target voltage of the series regulator less than or equal to the output target voltage of the switching regulator and, when the output voltage is changed, sets the output target voltage of the series regulator as the output target voltage of the power supply apparatus for just a predetermined period of time.
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Abstract
A power supply apparatus and power supply method that are able to decrease the overshoot/undershoot that occurs at the time of power supply voltage switching and enhance the voltage switching speed. Power supply apparatus 100, when in a transient state where output voltage is increased, supplies DAC value DD1 of DCDC register 202, which is the register for switching regulator 400, to LDO DAC 302 in place of DAC value LDO1 of LDO register 201, which is the register for series regulator 300, and LDO DAC 302 of series regulator 300 performs DAC operation while referring to DAC value DD1 of DCDC register 202.
26 Citations
11 Claims
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1. A power supply apparatus comprising:
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a series regulator that generates and outputs output voltage in accordance with an output target voltage; a switching regulator that generates and outputs output voltage in accordance with an output target voltage; and a control apparatus that switches between the series regulator and the switching regulator according to the settings of the output target voltages, wherein; the output of the series regulator and the output of the switching regulator are connected; and the control apparatus, when in a stationary state, sets the output target voltage of the series regulator less than or equal to the output target voltage of the switching regulator and, when the output voltage is changed, sets the output target voltage of the series regulator as the output target voltage of the power supply apparatus for just a predetermined period of time. - View Dependent Claims (3, 4, 7, 8, 9, 10)
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2. A power supply apparatus comprising:
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a series regulator that controls output target voltage according to output of a first DAC; a switching regulator that controls output target voltage according to output of a second DAC; and a control apparatus that inputs data to the first DAC and the second DAC, wherein; the output of the series regulator and the output of the switching regulator are connected; and the control apparatus, when in a stationary state, sets the output target voltage of the series regulator equal to or less than the output target voltage of the switching regulator and, when the output voltage is changed, sets the output target voltage of the series regulator as the output target voltage of the power supply apparatus for just a predetermined period of time. - View Dependent Claims (5, 6)
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11. A power supply method for switching between a series regulator and switching regulator that share an output terminal in accordance with usage conditions and supplying power, wherein:
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when in a stationary state, output target voltage of the series regulator is set equal to or less than output target voltage of the switching regulator; and when the output voltage is changed, the output target voltage of the switching regulator is set to the output target voltage of the series regulator for just a predetermined period of time so that power is supplied by the series regulator, even if power of the output voltage is to be supplied by the switching regulator.
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Specification