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Uninterruptible power supply unit

  • US 5,912,514 A
  • Filed: 01/06/1998
  • Issued: 06/15/1999
  • Est. Priority Date: 01/06/1998
  • Status: Expired due to Fees
First Claim
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1. An uninterruptible power supply unit for coupling between a DC power source and an electronic device, the uninterruptible power supply unit comprising:

  • a housing;

    a backup power supply in the housing for supplying backup power;

    an output switch system in the housing, the output switch system coupled between an output from the housing for coupling to the electronic device and either an input to the housing for coupling to the DC power source or the backup power supply, the output switch system coupling the backup power from the backup power supply to the electronic device when incoming power from the DC power source fails; and

    a polarity switch moveable between a positive position coupling one lead of the output from the housing to a positive terminal for the backup power supply and a negative position coupling the one lead of the output from the housing to a negative terminal for the backup power supply.

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