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ELECTRIC POWER-SUPPLY APPARATUS AND OVER-DISCHARGE CONTROL METHOD FOR USE THEREWITH

  • US 20090134704A1
  • Filed: 11/26/2008
  • Published: 05/28/2009
  • Est. Priority Date: 11/27/2007
  • Status: Abandoned Application
First Claim
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1. An electric power-supply apparatus comprising:

  • a first electric power-supply unit configured to supply electric power to a load using an external power supply;

    a second electric power-supply unit configured to be charged with electric power supplied from the first electric power-supply unit and configured to supply electric power to the load using an auxiliary power supply when supply of electric power to the load by the first electric power-supply unit is stopped;

    an auxiliary voltage detection unit configured to operate using the electric power supplied from the first electric power-supply unit or the second electric power-supply unit and configured to detect a voltage output by the second electric power-supply unit; and

    a switching unit configured to set, when the auxiliary voltage detection unit detects that the voltage output by the second electric power-supply unit has decreased to less than an auxiliary voltage threshold value, the second electric power-supply unit, the load, and the auxiliary voltage detection unit to a disconnected state in which electric power is not supplied from the second electric power-supply unit to the load and the auxiliary voltage detection unit, and configured to set, when the auxiliary voltage detection unit does not detect that the voltage output by the second electric power-supply unit has decreased to less than the auxiliary voltage threshold value, the second electric power-supply unit, the load, and the auxiliary voltage detection unit to a connected state in which electric power is supplied from the second electric power-supply unit to the load and the auxiliary voltage detection unit.

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