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VOLTAGE DETECTION CIRCUIT, ECU, AUTOMOBILE WITH ECU

  • US 20120306516A1
  • Filed: 03/13/2012
  • Published: 12/06/2012
  • Est. Priority Date: 06/01/2011
  • Status: Active Grant
First Claim
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1. A voltage detection circuit, comprising:

  • a threshold value generation unit provided between a higher voltage source and a lower voltage source, and configured to generate a setting voltage equal to (1/n) of a voltage of the higher voltage source (where n>

    1) and to convert the setting voltage to a first current;

    a first resistor having one end connected to a detection terminal;

    a detection unit provided between the higher voltage source and the lower voltage source and connected to the other end of the first resistor, the detection unit being configured to detect the first current and configured such that the detection unit causes a constant detection terminal input current to flow from the detection terminal to the first resistor when an applied voltage applied to the detection terminal is greater than or equal to {1+(1/n)} times the voltage of the higher voltage source; and

    a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit being configured to receive an output signal from the detection unit and configured such that the detection output unit outputs a first signal to a detection output terminal when the applied voltage is less than {1+(1/n)} times the voltage of the higher voltage source, the detection output unit being configured to output a second signal to the detection output terminal when the application voltage is greater than or equal to {1+(1/n)} times the voltage of the higher voltage source.

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