UPS with auto self test
First Claim
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1. A uninterruptible power supply having a stand-by mode of operation and a back-up mode of operation, said power supply comprising:
- input means for receiving input AC power from an AC power source;
output means for providing power to a load;
back-up power means for providing back-up power to said load during said back-up mode of operation;
power switch means coupled to said input means, said output means and to said back-up power means for coupling said AC power to said load during said stand-by mode and coupling said back-up power to said load during said back-up mode; and
control means coupled to said power switch means and to said back-up power means for controlling the operating modes of said power supply, said control means including test means for automatically testing the capacity of said back-up power means to meet the power load requirements of said load.
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Abstract
An uninterruptible power supply (UPS) is disclosed in which AC line power is used to charge a back-up battery and to operate a load during a stand-by mode of operation of the UPS. In the back-up mode of operation when AC line power is not available, the battery is used to supply power to the load. The UPS automatically tests the load and the battery when the AC line power is available to assure availability of back-up power in case of a failure of the AC power. The results of the test is displayed to the user.
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Citations
12 Claims
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1. A uninterruptible power supply having a stand-by mode of operation and a back-up mode of operation, said power supply comprising:
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input means for receiving input AC power from an AC power source; output means for providing power to a load; back-up power means for providing back-up power to said load during said back-up mode of operation; power switch means coupled to said input means, said output means and to said back-up power means for coupling said AC power to said load during said stand-by mode and coupling said back-up power to said load during said back-up mode; and control means coupled to said power switch means and to said back-up power means for controlling the operating modes of said power supply, said control means including test means for automatically testing the capacity of said back-up power means to meet the power load requirements of said load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An uninterruptible power supply having a stand-by mode of operation and a back-up mode of operation, said power supply comprising:
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input means for receiving input AC power from an AC power source; output means for providing power to a load; back-up power means for providing back-up power to said load during said back-up mode of operation; power switch means coupled to said input means, said output means and to said back-up power means for coupling said AC power to said load during said stand-by mode and coupling said back-up power to said load during said back-up mode; and control means coupled to said power switch means and to said back-up power means for controlling the operating modes of said power supply, said control means including test means for automatically testing the capacity of said back-up power means to meet the power load requirements of said load, wherein said automatic testing is in response to a rise in the level of said AC power to a predetermined level.
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Specification