Backup apparatus
First Claim
1. A backup apparatus comprising:
- a first backup power supply for applying a power supply voltage to a load when a voltage provided by a main power supply falls below a first threshold voltage, said first backup power supply generating a first threshold voltage;
threshold voltage generating means for generating a second threshold voltage using a second backup power supply;
first comparing means for comparing the first threshold voltage generated by said first backup power supply with the voltage of the main power supply;
second comparing means for comparing the second threshold voltage generated by said threshold voltage generating means with the voltage of said first backup power supply;
switching means for switching the power supply voltage applied to the load from the main power supply to said first backup power supply in response to a comparison result provided by said second comparing means; and
output means for outputting the status of said first backup power supply in response to a comparison result provided by said first comparing means.
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Accused Products
Abstract
A backup apparatus includes a main body power supply for applying a voltage from a main body to loads during a normal operation, a first backup power supply for applying a power supply voltage to a specific load of the loads when a voltage of the main body power supply drops, a second backup power supply for applying a power supply voltage to the specific load when a voltage of the first backup lower supply drops, a first threshold voltage generator for generating a first threshold voltage generated by the first backup power supply, a second threshold voltage generator for generating a second threshold voltage generated by the second backup power supply, a comparator for comparing the first threshold voltage with the second threshold voltage, a first switch circuit for switching the power supply voltage applied to the specific load from the main body power supply to the first backup power supply when the voltage of the main body power supply drops, and a second switch circuit for switching the power supply voltage applied to the specific load from the first backup power supply to the second backup power supply in accordance with a comparison result from the comparator when the voltage of the first backup power supply drops.
38 Citations
13 Claims
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1. A backup apparatus comprising:
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a first backup power supply for applying a power supply voltage to a load when a voltage provided by a main power supply falls below a first threshold voltage, said first backup power supply generating a first threshold voltage; threshold voltage generating means for generating a second threshold voltage using a second backup power supply; first comparing means for comparing the first threshold voltage generated by said first backup power supply with the voltage of the main power supply; second comparing means for comparing the second threshold voltage generated by said threshold voltage generating means with the voltage of said first backup power supply; switching means for switching the power supply voltage applied to the load from the main power supply to said first backup power supply in response to a comparison result provided by said second comparing means; and output means for outputting the status of said first backup power supply in response to a comparison result provided by said first comparing means. - View Dependent Claims (2, 3, 4)
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5. A backup apparatus for a plurality of loads comprising a first load and a second load supplied with power by a main power supply, said backup apparatus comprising:
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a first backup power supply for supplying power to the first load when a voltage of the main power supply falls below a first predetermined threshold voltage; a second backup power supply for supplying power to the second load when the main power supply voltage falls below a second predetermined threshold voltage; first switch means for switching the power supply to the first load from the main power supply to said first backup power supply when the main power supply voltage falls below the first predetermined threshold voltage; second switch means for switching the power supply to the second load from the main power supply to said second backup power supply when the main power supply voltage falls below the second predetermined threshold voltage; and third switch means for switching the power supply to the second load from said first backup power supply to second backup power supply when a voltage of said first backup power supply voltage falls below the first predetermined threshold voltage. - View Dependent Claims (6)
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7. A method for backing up a main power supply, comprising:
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an applying step, of applying a power supply voltage from a first backup power supply to a load when a voltage of the main power supply falls below a predetermined voltage; a first generating step, of generating a first threshold voltage from the first backup power supply; a second generating step, of generating a second threshold voltage using a second backup power supply; a first comparing step, of comparing the first threshold voltage generated in said first generating step with the voltage of the main power supply; a second comparing step, of comparing the second threshold voltage generated in said second generating step with the voltage of the backup power supply; a switching step, of switching the power supply voltage applied to the load from the main power supply to the first backup power supply in response to a comparison result obtained in said second comparing step; and an outputting step, of outputting the status of the first backup power supply in response to a comparison result obtained in said first comparing step. - View Dependent Claims (8, 9, 10, 11)
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12. A method for backing up power supplied from a main power supply to a plurality of loads comprising a first load and a second load, said method comprising the steps of:
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supplying power from a first backup power supply to the first load when a voltage of the main power supply falls below a first threshold voltage; supplying power from a second backup power supply to the second load when the main power supply voltage falls below a second threshold voltage; switching the power supply to the first load from the main power supply to the first backup power supply when the main power supply voltage falls below the first threshold voltage; switching the power supply to the second load from the main power supply to the second backup power supply when the main power supply voltage falls below the second threshold voltage; and switching the power supply to the first load from the first backup power supply to the second backup power supply when the voltage of the first backup power supply falls below the second threshold voltage. - View Dependent Claims (13)
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Specification