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Voltage detection circuit, ECU, automobile with ECU

  • US 9,075,087 B2
  • Filed: 03/13/2012
  • Issued: 07/07/2015
  • 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 one Nth part of a voltage of the higher voltage source and to convert the setting voltage to a first current, wherein N is greater than one;

    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, the detection unit having an input port connected to an output port of the threshold value generation unit, the detection unit having a first output port connected to the other end of the first resistor and further having a second output port, 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 the voltage of the higher voltage source times the sum of one plus one Nth part; and

    a detection output unit provided between the higher voltage source and the lower voltage source, the detection output unit having an input port connected to the second output port of the detection unit, 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 the voltage of the higher voltage source times the sum of one plus one Nth part, 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 the voltage of the higher voltage source times the sum of one plus one Nth part.

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