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Electric power unit

  • US 5,161,097 A
  • Filed: 03/20/1992
  • Issued: 11/03/1992
  • Est. Priority Date: 11/12/1991
  • Status: Expired due to Fees
First Claim
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1. An electric power unit for supplying power to a battery-powered load circuit, comprising:

  • a chopper-controlled nonisolated DC-DC converter for converting the output voltage of a battery into a required voltage;

    a bypass switch for bypassing the chopper-controlled nonisolated DC-DC converter to connect the battery directly to the load circuit;

    a comparing means for comparing the output voltage of the battery with a threshold voltage to see if the output voltage of the battery is higher than the threshold voltage; and

    a control means for controlling the bypass switch on the basis of the output signal of the comparing means to hold the chopper-controlled nonisolated DC-DC converter inoperative by closing the bypass switch so that the battery is connected directly to the load circuit and to make the chopper-controlled nonisolated DC-DC converter operative by opening the bypass switch so that the output power of the battery is supplied through the chopper-controlled nonisolated DC-DC converter to the load circuit.

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