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Current waste suppressing power supply apparatus

  • US 7,279,879 B2
  • Filed: 08/02/2004
  • Issued: 10/09/2007
  • Est. Priority Date: 07/31/2003
  • Status: Expired due to Fees
First Claim
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1. A power supply apparatus, comprising:

  • a battery configured to output a power supply voltage;

    a voltage regulator having an output driver and configured to regulate the power supply voltage output from the battery and output a constant voltage to an interior circuit and external instruments through the output driver, said voltage regulator having a reference voltage source configured to provide a regulator reference voltage and a comparison use amplifier configured to compare a feedback voltage fed back from the output driver with the regulator reference voltage, an output from said comparison use amplifier being input to said output driver so that the output driver outputs the constant voltage; and

    a power supply voltage detecting device configured to determine if the power supply voltage of the battery is less than the regulator reference voltage based upon the output from the comparison use amplifier.

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