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Backup device for electric appliance

  • US 5,844,328 A
  • Filed: 04/06/1995
  • Issued: 12/01/1998
  • Est. Priority Date: 04/06/1995
  • Status: Expired due to Term
First Claim
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1. An electric pump system including a backup power system, comprising:

  • an electric pump;

    a primary source of AC current connected to said electric pump through a primary circuit;

    a backup battery;

    charging circuit means for connecting said primary source to said backup battery and including battery charging means for charging said backup battery;

    backup circuit means for connecting said backup battery to said electric pump and including converter means for converting DC current from said backup battery to AC current for said appliance;

    first switch means interposed in said primary circuit and said backup circuit means for selectively closing and primary circuit and opening said backup circuit means during normal operation of said primary source, and for closing said backup circuit means upon at least partial failure of said primary source so as to connect said backup battery to said electric pump through said converter, whereby said backup battery is charged and isolated from said electric pump during normal operation of said primary source, and said backup battery is connected through said converter to said electric pump for supplying AC current to said electric pump upon failure of said primary source, wherein said switch means comprises a switch element positioned in series along said primary circuit for connecting said primary source to said electric pump, and in series along said backup battery circuit means, and wherein said switch means is actuable between a normal position wherein said primary circuit is closed and said backup circuit means is open, and a backup position wherein said backup circuit means is closed and said primary circuit is open; and

    a second switch positioned in said charging circuit means a switchable between a closed position wherein said charging circuit means is operative and an open position wherein said battery charging means is disconnected from said backup battery; and

    wherein said first switch means comprises means for positioning said second switch in said open position when said backup circuit means is closed, whereby said battery charging means is disconnected from said backup battery when said backup battery is connected to said appliance.

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