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Power circuit for battery

  • US 7,221,064 B2
  • Filed: 12/21/2005
  • Issued: 05/22/2007
  • Est. Priority Date: 01/24/2003
  • Status: Expired due to Fees
First Claim
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1. A power control circuit for supplying power to an electric motor that is coupled to an engine, the circuit comprising:

  • a battery as a first energy storage source;

    a capacitor as a second energy storage source connected in series with the first energy storage source;

    a DC/DC converter for converting electric power supplied to the first energy storage source and the second energy storage source; and

    control means for controlling the DC/DC converter, wherein the control meansdetects voltage of the one of the first and second energy storage sources that is disposed on a high voltage side, as the high voltage side energy storage source, andwhen the voltage detected is lower than a first threshold voltage, causes the high voltage side energy storage source to be charged through the DC/DC converter.

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