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UPS with auto self test

  • US 5,458,991 A
  • Filed: 05/19/1993
  • Issued: 10/17/1995
  • Est. Priority Date: 05/19/1993
  • Status: Expired due to Fees
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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