DC charging station for a battery of an electric vehicle
First Claim
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.
1 Assignment
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Accused Products
Abstract
A DC voltage source, for example an AC/DC converter, has an output producing a controllable DC voltage for a DC charging station to charge the battery of an electric vehicle. A voltage balancing unit is connected between the output of the converter and the output terminal of the DC charging station. The voltage balancing unit has a controllable switch by which the connection between voltage source or converter and battery can be made or broken as desired. The switch is controlled as a function of the voltage on the input and output side of the voltage balancing unit to the effect that the switch breaks the connection before and while the battery is being connected to the DC output terminal, and makes a connection only when the voltage on the input side of the voltage balancing unit corresponds substantially to the voltage on the output side of the voltage balancing unit.
21 Citations
15 Claims
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1. A DC charging station for charging a battery of an electric vehicle, the DC charging station comprising:
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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, and a 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, and make 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, and switch 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. - View Dependent Claims (2, 3, 4, 5, 14)
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6. A method for charging a battery of an electric vehicle using a DC charging station with a DC voltage source, which makes a DC voltage available, at least in the operating state 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, a voltage balancing unit connected between the output of the DC voltage source and the DC output terminal of the DC charging station and having a first switch controllable to make or break a connection between the output of the DC voltage source and the DC output terminal of the DC charging station, a shunt resistor via which the input-side voltage is measured, and a second switch connected in series with the shunt resistor and controlled in opposition to the first switch, said method comprising:
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breaking 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; detecting the input-side voltage and the output-side voltage of the voltage balancing unit after the battery to be charged has been connected to the DC output terminal; controlling the first switch to make the connection between the output of the DC voltage source and the DC output terminal by the first switch only when the input-side voltage detected by the voltage balancing unit corresponds substantially to the output-side voltage detected by the voltage balancing unit; and controlling the second switch to switch on the shunt resistor when the voltage balancing unit carries out the voltage balancing, and switch 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. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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15. A DC charging station for charging a battery of an electric vehicle, comprising:
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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, having a first switch that selectably makes and breaks a connection between the output of the DC voltage source and the DC output terminal; 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; open the first switch to break the connection between the output of the DC voltage source and the DC output terminal before the battery is connected to the DC output terminal, maintain the switch open during a physical connecting of the battery to the DC output terminal, after the battery is connected to the DC output terminal, receive from the voltage balancing unit an input-side voltage and output-side voltage detected by the first and second voltage detection units, respectively, after the battery is connected to the DC output terminal, and close the first switch to make the connection between the output of the DC voltage source and the DC output terminal if the input-side voltage detected by the voltage balancing unit after the battery is connected to the DC output terminal corresponds substantially to the output-side voltage detected by the voltage balancing unit after the battery is connected to the DC output terminal, such that connection of the battery to the DC voltage source occurs after connection of the battery to the DC output terminal, and is conditional upon a defined balance voltage condition.
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Specification