Method for charging a traction battery using a three phase source
AssigneeZF Friedrichshafen AG
InventorsRobert Januschevski, Juergen Kett
Life of this patent
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Abstract
The present method relates to a method of charging a traction battery of a vehicle from an external AC power supply system. The traction battery is coupled, via an inverter, to an electric alternating-field machine such that the AC power supply can be connected to the phase windings of the alternating-field machine. The method includes a step of synchronizing the rotational speed of the alternating-field machine with the frequency of the AC power supply. Then the AC power supply is connected to the phase windings of the alternating-field machine and the inverter, which is electrically coupled to the alternating-field machine, is operated as a step-up converter.
Claims11
A method of charging a traction battery (2) of a motor vehicle from an external AC power supply system, in which the traction battery (2) to be charged is coupled, via an inverter (3), to an electric alternating-field machine (4) such that the AC power supply is connectable to phase windings (L1, L2, L3) of the alternating-field machine (4), the method comprising the steps of:
- controlling a rotational speed of the alternating-field machine by adjusting, with the inverter, power from the traction battery to the alternating-field machine;
- synchronizing the rotational speed of the alternating-field machine (4) with a frequency of the AC power supply;
- connecting the AC power supply to the phase windings (L1, L2, L3) of the alternating-field machine (4);
- and
- operating the inverter (3), that is electrically coupled to the alternating-field machine (4), as a step-up converter.
A device for charging a traction battery (2) of a motor vehicle, the device comprising:
- an external AC power supply,
- the traction battery (2) to be charged being coupled, via an inverter (3), to an electric alternating-field machine (4) such that the AC power supply is connectable to phase windings (L1, L2, L3) of the alternating-field machine (4),
- a rotational speed of the alternating-field machine (4) being controlled by adjusting, with the inverter, power from the traction battery to the alternating-field machine so as to synchronize the rotational speed of the alternating-field machine with a frequency of the AC power supply,
- the AC power supply being connected to the phase windings (L1, L2, L3) of the alternating-field machine (4), and
- the inverter (3) being electrically coupled to the alternating-field machine (4) and being operated as a step-up converter.
A method of charging a traction battery of a motor vehicle with power from an external AC power supply, the method comprising the steps of:
- coupling the traction battery, via an inverter, to an electric alternating-field machine and selectively coupling the AC power supply to phase windings of the alternating-field machine;
- determining and comparing, with a synchronization device, a rotational speed of the alternating-field machine and a frequency of the power from the AC power supply;
- controlling the rotational speed of the alternating-field machine by adjusting, with the inverter, power from the traction battery to the alternating-field machine so as to synchronize the rotational speed of the alternating-field machine and the frequency of the power from the AC power supply;
- coupling the AC power supply to the phase windings of the alternating-field machine;
- and
- operating the inverter as a step up converter for directing at least one of the power from the AC power supply and the power from the alternating-field machine to the traction battery.
Dependencies are inferred from the claim text.