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DC charging station for a battery of an electric vehicle

  • US 9,764,650 B2
  • Filed: 08/31/2011
  • Issued: 09/19/2017
  • Est. Priority Date: 09/23/2010
  • Status: Active Grant
First Claim
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1. A DC charging station for charging a battery of an electric vehicle, the DC charging station comprising:

  • a DC voltage source with an output providing a DC voltage at least during operation of the DC charging station;

    a DC output terminal, to which the battery to be charged is able to be connected and connectable to the DC voltage source via at least one line, charging the battery during the operation of the DC charging station;

    a voltage balancing unit, connected between the output of the DC voltage source and the DC output terminal, the voltage balancing unit comprising;

    a first switch that selectably makes and breaks a connection between the output of the DC voltage source and the DC output terminal;

    a shunt resistor via which the input-side voltage is measured, anda second switch connected in series with the shunt resistor and controlled in opposition to the first switch,a first voltage detection unit, detecting an input-side voltage of the voltage balancing unit;

    a second voltage detection unit, detecting an output-side voltage of the voltage balancing unit; and

    a first open-loop and closed-loop control unit controlling and regulating the voltage balancing unit, to which measured values detected by the first and the second voltage detection unit are supplied, configured to;

    control the first switch to;

    break the connection between the output of the DC voltage source and the DC output terminal before and while the battery is connected to the DC output terminal, andmake the connection between the output of the DC voltage source and the DC output terminal, at least to the battery connected to the DC output terminal, if the input-side voltage detected by the voltage balancing unit corresponds substantially to the output-side voltage detected by the voltage balancing unit; and

    control the second switch to;

    switch on the shunt resistor when the voltage balancing unit carries out the voltage balancing, andswitch off the shunt resistor when the input-side voltage of the voltage balancing unit corresponds substantially to the output-side voltage of voltage balancing unit.

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