Charging cable for a motor vehicle which can be operated by electricity

Abstract

A charging cable for a motor vehicle can be operated by electricity having a filter device. The charging cable includes a first conductor and a second conductor configured to transfer a current, a safety ground line, and a signal line configured to transfer charging information relating to a charging process. The filter device includes a core around which the first and second conductors and the safety ground line are wound, and the signal line is wound around the core.

Claims

1. A charging cable for an electrically operable motor vehicle having a filter device, wherein the charging cable comprises: a first conductor and a second conductor configured to transfer a current; a safety ground line; and a signal line configured to transfer charging information relating to a charging process, wherein the filter device comprises a core around which the first and second conductors and the safety ground line are wound, wherein the signal line is wound around the core, wherein the first conductor and the second conductor are wound around the core in a same sense in a first direction of rotation, wherein the safety ground line and the signal line are wound around the core in a same sense in a second direction of rotation, and wherein the first direction and the second direction of rotation are mutually opposite directions of rotation.

2. The charging cable according to claim 1, wherein the core is made of a nanocrystalline material.

3. The charging cable according to claim 1, wherein the core has the shape of a toroid with a length from 4 to 5 cm.

4. The charging cable according to claim 1, wherein the core has a diameter of 0.5 cm to 1.5 cm.

5. The charging cable according to claim 1, wherein the filter device is arranged close to a respective end of the first and second conductors, and wherein the safety ground line and the signal line are connected to respective contacts of a charging socket of the motor vehicle when the charging cable is in an installed state in the motor vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic depiction of a charging cable known from the prior art with a filter device.

(2) FIG. 2 shows a charging cable designed according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

(3) The charging cable designed according to the invention that is shown in FIG. 2 comprises a first conductor L and a second conductor N (neutral conductor). The first conductor L and the second conductor N are used for transferring a current. Also, the charging cable comprises a safety ground line PE and a signal line CP. The signal line CP is used for transferring charging information relating to a charging process. During communication via the charging cable, the safety ground line PE is used as a return conductor for the signal line CP.

(4) The charging cable further comprises a filter device 20 as an integral part. The filter device comprises a core 21, which is depicted merely schematically in FIG. 2. In particular, merely that section of the core 21 around which the first and second conductors L, N, the safety ground line PE and the signal line CP are wound is depicted.

(5) As emerges from the schematic depiction of FIG. 2, the first conductor L and the second conductor N are wound around the core 21 in the same sense in a first direction of rotation. The safety ground line PE and the signal line CP are likewise wound around the core 21 in the same sense in a second direction of rotation, which is opposite to the first direction of rotation. This type of winding means that the filter device 20 does not influence the data transfer via the signal line CP during the current transfer between the first conductor L and the second conductor N. Beyond that, a high level of filter attenuation can be achieved.

(6) As a result of the signal line also being wound around the core, the signal line is an integral part of the charging cable.

(7) The filter apparatus is arranged close to a respective end of the first and second conductors L, N, the safety line PE and the signal line CP which, when the charging cable 10 is in the installed state in the motor vehicle (not depicted), are connected to respective contacts of a likewise undepicted charging socket of the motor vehicle.

(8) It should be emphasized that the present charging cable is a charging cable installed inside the motor vehicle that connects the contacts of the aforementioned charging socket to a charger for charging the energy store of the motor vehicle. The charging socket is then connected, by means of a further, normally external charging cable, to a grid connection or a charging post for charging the energy store.

(9) The proposed charging cable installed in the motor vehicle is intended to suppress interference for a component of the vehicle by using the filter device provided in the charging cable. The filter device may be arranged in a housing, which is in particular sealed from ambient influences. The core of the filter device is in particular in the form of an annular core, wherein the shape thereof can also have the shape of a rectangle or square.

(10) The core 21 of the filter device is in particular made from a nanocrystalline material in order to ensure good interference suppression.

LIST OF REFERENCE SIGNS

(11) 10 Charging cable 20 Filter device 21 Core L First conductor N Second conductor PE Safety ground line CP Signal line

(12) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.