SWITCHING POWER SUPPLY APPARATUS
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Accused Products
Abstract
A switching power supply apparatus includes an isolated converter that has efficiency characteristics in which power conversion efficiency at a rated load is higher than power conversion efficiency at a light load and that converts power-supply voltage into direct-current voltage to output the direct-current voltage; an FET that switches supply and shutoff of the power-supply voltage to the isolated converter; a secondary battery that stores the direct-current voltage output from the isolated converter; a voltage detector that detects an amount of charge in the secondary battery; and a controller that switches the FET on the basis of the amount of charge in the secondary battery.
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Citations
16 Claims
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1. (canceled)
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2. A switching power supply apparatus comprising:
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a converter circuit configured to have efficiency characteristics in which power conversion efficiency at a rated load is higher than power conversion efficiency at a light load and that converts power-supply voltage into direct-current voltage to output the direct-current voltage; a switching unit configured to switch supply and shutoff of the power-supply voltage to the converter circuit; a charge unit configured to store the direct-current voltage output from the converter circuit; a detecting unit configured to detect an amount of charge in the charge unit; and a controller configured and programmed to switch the switching unit based on the amount of charge detected by the detecting unit;
whereinthe controller is configured and programmed to set the switching unit to the shutoff state if the amount of charge in the charge unit is higher than a first threshold value and set the switching unit to the supply state if the amount of charge in the charge unit is lower than a second threshold value; the controller is configured and programmed to output the direct-current voltage subjected to the conversion in the converter circuit and store the direct-current voltage subjected to the conversion in the converter circuit in the charge unit when the switching unit is in the supply state and output the direct-current voltage stored in the charge unit when the switching unit is in the shutoff state; and a frozen period in which the switching unit is in the shutoff state is controlled depending on an increase and a decrease of output power and the frozen period is lengthened with the decreasing output power. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification