Uninterruptible power supply diagnosing remaining battery capacity during normal external power source operation
First Claim
1. A power supply, which is energized by at least one of an external power source and a battery, and supplies electric power to a load, comprising:
- means for detecting a battery voltage generated by the battery;
means for detecting an amount of electric charges discharged from the battery when the power supply is energized by the battery; and
means for detecting a remaining capacity of the battery in accordance with a change in the battery voltage when the external power source is free of power failure;
wherein said battery voltage change is a difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by a predetermined current for a predetermined period of time.
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Accused Products
Abstract
A power supply is energized by an external power source and a battery, and supplies electric power to a load. The power supply includes a battery voltage detector and a current detector for detecting a discharge current from the battery. The remaining capacity of the battery is detected in accordance with a change in the battery voltage when the external power source is free of power failure. The battery voltage change is defined as the difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by the detected discharge current for a predetermined period of time.
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Citations
17 Claims
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1. A power supply, which is energized by at least one of an external power source and a battery, and supplies electric power to a load, comprising:
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means for detecting a battery voltage generated by the battery; means for detecting an amount of electric charges discharged from the battery when the power supply is energized by the battery; and means for detecting a remaining capacity of the battery in accordance with a change in the battery voltage when the external power source is free of power failure; wherein said battery voltage change is a difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by a predetermined current for a predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply apparatus in which when power from an input AC power supply is power-converted by said power supply apparatus and is supplied to a load, even if said input AC power supply fails for a short period of time, power is supplied from a storage battery to the load through a DC circuit of said power supply apparatus, and stable power can be continuously supplied to the load during the power failure, said power supply apparatus comprising:
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means for causing said storage battery to supply at least part of power to be supplied to the load for a first predetermined period of time while said input AC power supply is normally operated; and means for diagnosing a remaining capacity of said storage battery on the basis of a charge which is discharged from said storage battery during the first predetermined period of time; wherein said means for diagnosing includes means for detecting said remaining capacity of the battery in accordance with a change in the battery voltage when said AC power supply is operating, said change being a difference between an initial voltage of the battery and an active voltage of the battery obtained when the batter is discharged by a predetermined current for a second predetermined period of time. - View Dependent Claims (11)
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12. A power supply apparatus in which when power from an input AC power supply is power-converted by said power supply apparatus and is supplied to a load, even if said input AC power supply fails for a short period of time, power is supplied form a storage battery to the load through a DC circuit of said power supply apparatus, and stable power can be continuously supplied to the load during the power failure, said power supply apparatus comprising:
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means for controlling said power supply so as to cause said storage battery to supply at least part of power to be supplied to the load for a first predetermined period of time while said input AC power supply is normally operated; and means for diagnosing a power failure backup time of said storage battery on the basis of a load capacity and a charge which is discharged from said storage battery during the first predetermined period of time; wherein said means for diagnosing includes means for detecting a remaining capacity of the battery in accordance with a change in the battery voltage when said AC power supply is operating, said change being a difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by a predetermined current for a second predetermined period of time. - View Dependent Claims (13)
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14. A power supply apparatus in which when an input AC power supply fails, power can be uninterruptibly supplied from a storage battery to a load, comprising:
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means for performing an equalizing charge operation of said storage battery for a first predetermined period of time and subsequently switching the equalizing charge operation to a floating charge operation while said input AC power supply is normally operated; and means for diagnosing a capacity of said storage battery on the basis of a charge which is discharged from said storage battery for a desired period of time when the floating charge operation is performed. wherein said means for diagnosing include means for detecting a remaining capacity of the battery in accordance with a change in the battery voltage when said AC power supply is operating, said change being a difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by a predetermined current for a second predetermined period of time. - View Dependent Claims (15, 17)
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16. A power supply apparatus in which when power from an input AC power supply is power-converted by said power supply apparatus and is supplied to a load, even if said input AC power supply fails for a short period of time, power is supplied from a storage battery to the load through a DC circuit of said power supply apparatus, and stable power can be continuously supplied to the load during the power failure, said power supply apparatus comprising:
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means for causing said storage battery to supply at least part of power to be supplied to the load for a first predetermined period of time while said input AC power supply is normally operated; and means for diagnosing a remaining capacity of said storage battery on the basis of a charge which is discharged from said storage battery during the predetermined period of time, thereby automatically performing equalizing charging in accordance with the diagnosis result; wherein said means for diagnosing include means for detecting a remaining capacity of the battery in accordance with a change in the battery voltage when said AC power supply is operating, said change being a difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by a predetermined current for said predetermined period of time.
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Specification