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Connection detecting circuit

  • US 9,923,391 B2
  • Filed: 02/17/2016
  • Issued: 03/20/2018
  • Est. Priority Date: 02/18/2015
  • Status: Active Grant
First Claim
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1. A circuit, comprising:

  • a vehicle-side connecting part provided in an electrically driven vehicle;

    a charger-side connecting part provided in an external charger, the charger-side connecting part being configured to be connected to the vehicle-side connecting part to supply power to a battery installed in the electrically driven vehicle; and

    a vehicle-side circuit, provided at the electrically driven vehicle, and configured to be connected to the charger-side connector via the vehicle-side connecting part and the charger-side connecting part, the vehicle-side circuit being grounded in a state that the vehicle-side connecting part and the charger-side connecting part are connected to each other,wherein the vehicle-side circuit includes;

    a power source;

    a switch electrically connected to the power source and turns on or off current supply from the power source;

    a first resistor electrically connected between the switch and the vehicle-side connecting part;

    a second resistor electrically connected to the first resistor in series between the first resistor and the vehicle-side connecting part;

    a voltage detector which detects a voltage at a connection point of the first resistor and the second resistor; and

    a determining part which determines a state of connection between the vehicle-side connecting part and the charger-side connecting part and occurrence of a failure in the vehicle-side circuit based at least in part on the voltage detected by the voltage detector and an on/off state of the switch.

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