Switching power supply apparatus with improved power conversion efficency to reduce power usage
First Claim
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1. A switching power supply apparatus comprising:
- a first converter configured to have efficiency characteristics in which power conversion efficiency of a rated load is higher than power conversion efficiency of a light load and that converts power-supply voltage that is input into direct-current voltage to output the direct-current voltage;
a charge unit configured to store the direct-current voltage output from the first converter;
an amount-of-charge detecting unit configured to detect an amount of charge in the charge unit; and
a controller configured and programmed to switch driving and stopping of the first converter based on the amount of charge detected by the amount-of-charge detecting unit;
whereinthe controller is configured and programmed to stop the first converter if the amount of charge in the charge unit is higher than a first threshold value and drive the first converter if the amount of charge in the charge unit is lower than a second threshold value regardless of a current through a load;
the controller is configured and programmed to output the direct-current voltage subjected to the conversion in the first converter and store the direct-current voltage subjected to the conversion in the first converter in the charge unit when the first converter is driven and output the direct-current voltage stored in the charge unit when the first converter is stopped;
a frozen period, during which the first converter is stopped to be in a frozen state, is controlled depending on an amount of power, which is defined by a product of power and time, consumed by the load and the frozen period is lengthened as the amount of power decreases; and
depending on a level of the load, power is supplied by varying a period during which the first converter is in a drive state and a period during which the first converter is in the frozen state, which is an input power of 0, converting fixed loss which is not related to the current into variable loss which is related to the current, such that efficiency is almost constant regardless of the current through the load.
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Abstract
A switching power supply apparatus includes an isolated converter with efficiency characteristics in which power conversion efficiency of a rated load is higher than power conversion efficiency of a light load and that converts power-supply voltage into direct-current voltage to output the direct-current voltage, 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 driving and stopping of the isolated converter on the basis of the detected amount of charge.
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Citations
16 Claims
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1. A switching power supply apparatus comprising:
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a first converter configured to have efficiency characteristics in which power conversion efficiency of a rated load is higher than power conversion efficiency of a light load and that converts power-supply voltage that is input into direct-current voltage to output the direct-current voltage; a charge unit configured to store the direct-current voltage output from the first converter; an amount-of-charge detecting unit configured to detect an amount of charge in the charge unit; and a controller configured and programmed to switch driving and stopping of the first converter based on the amount of charge detected by the amount-of-charge detecting unit;
whereinthe controller is configured and programmed to stop the first converter if the amount of charge in the charge unit is higher than a first threshold value and drive the first converter if the amount of charge in the charge unit is lower than a second threshold value regardless of a current through a load; the controller is configured and programmed to output the direct-current voltage subjected to the conversion in the first converter and store the direct-current voltage subjected to the conversion in the first converter in the charge unit when the first converter is driven and output the direct-current voltage stored in the charge unit when the first converter is stopped; a frozen period, during which the first converter is stopped to be in a frozen state, is controlled depending on an amount of power, which is defined by a product of power and time, consumed by the load and the frozen period is lengthened as the amount of power decreases; and depending on a level of the load, power is supplied by varying a period during which the first converter is in a drive state and a period during which the first converter is in the frozen state, which is an input power of 0, converting fixed loss which is not related to the current into variable loss which is related to the current, such that efficiency is almost constant regardless of the current through the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification