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Electric vehicle and discharging apparatus thereof

  • US 10,173,545 B2
  • Filed: 12/31/2012
  • Issued: 01/08/2019
  • Est. Priority Date: 12/31/2011
  • Status: Active Grant
First Claim
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1. A discharging apparatus for an electric vehicle, comprising:

  • an AC charging interface, connected with a charging pile and configured to transmit AC to a power grid via the charging pile, the charging pile being connected with the power grid;

    an instrument, configured to send a discharging preparation instruction after receiving a trigger signal;

    a controller, configured to communicate with the instrument and to detect whether the AC charging interface is connected with the charging pile after receiving the discharging preparation instruction, and to detect whether there is a PWM wave with a predetermined voltage in the controller, and if there is a PWM wave with a predetermined voltage in the controller, to switch to an external discharging mode;

    a battery manager, configured to communicate with the controller and to control an external discharging circuit in a high-voltage distribution box of the electric vehicle to be connected after the controller switches to the external discharging mode;

    a power battery, connected with the high-voltage distribution box,wherein the controller is configured to detect whether an electric quantity of the electric vehicle is greater than a predetermined value, and if yes, to convert a DC provided by the external discharging circuit into the AC and to output the AC to the AC charging interface so as to discharge to the power grid;

    the external discharging circuit comprises;

    a bidirectional DC-DC module connected to the power battery;

    a bidirectional DC-AC module connected to the power battery, the bidirectional DC-DC module and a driving control switch connected between the power battery and the bidirectional DC-AC module; and

    a charging-discharging control module connected between the bidirectional DC-AC module and the AC charging interface to provide the AC to the AC charging interface after the controller switches to the external discharging mode, the charging-discharging control module and the driving control switch are controlled by a controller module; and

    the controller is further configured to detect whether the electric vehicle is currently in a P gear after it is determined that the AC charging interface is connected with the charging pile, and if yes, the controller switches to the external discharging mode, wherein when the controller switches to the external discharging mode, the controller is further configured to;

    control the driving control switch to turn off to start the bidirectional DC-DC module;

    control a motor control switch to turn off to remove a motor; and

    control the charging-discharging control module to turn on.

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