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Vehicle charger and control pilot signal detection method thereof

  • US 10,232,726 B2
  • Filed: 06/17/2015
  • Issued: 03/19/2019
  • Est. Priority Date: 10/02/2014
  • Status: Active Grant
First Claim
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1. A control pilot (CP) signal detection method for a vehicle charger that charges a battery mounted in an electric vehicle (EV) by receiving power supplied from an electric vehicle supply equipment (EVSE), the CP signal detection method comprising:

  • counting, by a power controller equipped in the vehicle charger, CP signals based on signal levels of the CP signals during a set period of time, when an input of the CP signals is detected while an ignition of the EV is turned off;

    determining, by the power controller, whether a count of high-level CP signals among the CP signals is within a reference range, when the set period of time elapses; and

    outputting, by the power controller, state information of the CP signals based on the determination of whether the count of high-level CP signals is within the reference range, whereinthe counting of the CP signals includes;

    verifying the signal levels of the CP signals every time a clock signal is generated;

    classifying the CP signals into the high-level CP signals and low-level CP signals based on the verified signal levels;

    counting the high-level CP signals; and

    counting the low-level CP signals,the state information includes information regarding whether the CP signals are detected and information regarding a form of the CP signals,the power controller is configured to monitor the CP signals which are generated by the EVSE while the ignition of the EV is turned off and to control a main power source of the vehicle charger that is mounted within the vehicle charger and a sub-power source of the vehicle charger that is mounted within the vehicle charger, so as to turn the main power source and the sub-power source on or off, respectively, andthe main power source is configured to supply power to a charging controller controlling a charging operation of the vehicle charger, and the sub-power source is configured to receive a CP signal generated by the EVSE and to supply power to the power controller in response to the CP signal received from the EVSE.

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