Charging device for an electric vehicle

Patent metadata

Field	Value
Publication number	US-10106043-B2
Application number	US-201514848719-A
Country	US
Kind code	B2
Filing date	Sep 9, 2015
Priority date	Mar 12, 2013
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The invention relates to a charging device for an electric vehicle that can be driven by an electrical energy store. The charging device has a charging interface outside the electric vehicle, which can be fed by a three-phase alternating current from an external three-phase alternating current network. The charging device provides a charging current at the output that can be fed via a charging cable to the electric vehicle in order to charge the electrical energy store. The charging interface comprises a converter device configured to convert the three-phase alternating current into a single-phase alternating current as the charging current, and to distribute a phase load on the conduction phase of the single-phase alternating current substantially uniformly onto the three conduction phases of the three-phase alternating current during operation.

First claim

What is claimed is:

1. A charging device for an electric vehicle configured to be driven via an electrical energy store comprises:
a charging station outside of the electric vehicle configured to be fed at an input by a three-phase alternating current from an external three-phase AC grid, configured to provide a charging current at an output, wherein the charging current is supplied to the electrical energy store of the electric vehicle via a charging cable,
wherein the charging station comprises a converter device for converting the three-phase alternating current into a single-phase alternating current as the charging current, which converter device, during operation, distributes a phase load on the line phase of the single-phase alternating current substantially uniformly among the three line phases of the three-phase alternating current;
wherein the converter device comprises an AC-to-DC-to-AC converter configured to convert the three-phase alternating current into a direct current, and to further convert the direct current into the single-phase alternating current.

2. The charging device as claimed in claim 1 , wherein the converter device is configured to convert a three-phase alternating current with a phase current of up to 16 A.

3. The charging device as claimed in claim 1 , wherein the converter device is configured to provide a single-phase alternating current with a phase current of up to 32 A.

4. The charging device as claimed in claim 1 , wherein the charging station comprises a control unit configured to communicate with the electric vehicle to control the charging operation of the electrical energy store via a communications line in the charging cable.

5. The charging device as claimed in claim 1 , wherein the charging station further comprises an AC-to-DC converter for converting the three-phase alternating current into a direct current as a charging current.

6. The charging device as claimed in claim 2 , wherein the charging station further comprises an AC-to-DC converter for converting the three-phase alternating current into a direct current as a charging current.

7. The charging device as claimed in claims 5 , wherein the charging station comprises a multi-stage switch having a first and a second switching stage, wherein the multi-stage switch is controllable via the control unit and wherein,
in the first switching stage, the AC-to-DC converter is electrically connected to the external three-phase AC grid, and
in the second switching stage, the converter device is electrically connected to the external three-phase AC grid.

8. The charging device as claimed in claims 6 , wherein the charging station comprises a multi-stage switch having a first and a second switching stage, wherein the multi-stage switch is controllable via the control unit and wherein,
in the first switching stage, the AC-to-DC converter is electrically connected to the external three-phase AC grid, and
in the second switching stage, the converter device is electrically connected to the external three-phase AC grid.

9. The charging device as claimed in claim 8 , wherein the charging station comprises a further second switching stage in which the external three-phase AC grid is connected directly to a three-phase AC connection of the charging station for providing three-phase alternating current as the charging current, while bypassing the converter device.

10. The charging device as claimed in 1 , wherein the charging station comprises a plurality of electrical taps which are connectable to electrical lines of the charging cable, wherein at least a line phase and a neutral phase of the single-phase alternating current and grounding are provided via the plurality of electrical taps.

11. The charging device as claimed in 5 , wherein the charging station comprises a plurality of electrical taps which are connectable to electrical lines of the charging cable, wherein at least a line phase and a neutral phase of the single-phase alternating current and grounding are provided via the plurality of electrical taps.

12. The charging device as claimed in claim 11 , wherein the plurality of electrical taps comprises two taps for providing the direct current from the AC-to-DC converter.

13. The charging device as claimed in claim 11 , wherein the plurality of electrical taps comprises a tap for connection to a communications line in the charging cable.

14. The charging device as claimed in claim 12 , wherein the plurality of electrical taps comprises a tap for connection to a communications line in the charging cable.

15. The charging device as claimed in claim 1 , wherein a three-phase AC connection of the charging station is connectable directly to the external three-phase AC grid while bypassing the converter device.

16. The charging device as claimed in claim 6 , wherein the AC-to-DC converter is a converter stage of the AC-to-DC-to-AC converter when providing a single-phase alternating current as the charging current.

17. The charging device as claimed in claim 1 , wherein the charging station for charging the electrical energy store of the electric vehicle is provided on the basis of International Electrotechnical Commission standard 62196.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Weber Martin
• Kurtz Andreas

Classifications

• Y04S30/14

  Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing · CPC title

• H02J3/26

  Arrangements for eliminating or reducing asymmetry in polyphase networks · CPC title

• B60L3/0069

  relating to the isolation, e.g. ground fault or leak current · CPC title

• B60L53/31

  Charging columns specially adapted for electric vehicles · CPC title

• B60L2210/40

  DC to AC converters · CPC title