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Current detecting circuit

  • US 6,701,262 B2
  • Filed: 08/22/2001
  • Issued: 03/02/2004
  • Est. Priority Date: 08/23/2000
  • Status: Expired due to Fees
First Claim
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1. A current detecting circuit for use in a current supply circuit for supplying a load current from a power supply portion to a load when a switching unit interposed between said power supply portion and said load is turned on, said current detecting circuit comprising:

  • a voltage generating circuit for generating and outputting a second voltage which is lower by a predetermined voltage value than a first voltage outputted from said power supply portion;

    a current detecting resistor interposed between said power supply portion and said load and having a predetermined resistance value;

    an analog-digital conversion circuit which operates on the basis of a potential difference between said first voltage and said second voltage to thereby convert analog values into k-bit digital values, where k is an integer not smaller than 2; and

    an arithmetic circuit for calculating at least one of said load current and a value corresponding to said load current on the basis of the digital values which are obtained by the analog-digital conversion of voltages respectively on one and the other ends of said current detecting resistor by said analog-digital conversion circuit when said switching unit is turned on.

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