Traction network in an electric or hybrid vehicle

Abstract

The invention relates to a traction network (1) in an electric or hybrid vehicle, comprising a first traction line (2) and a second traction line (4), which each have an insulating sheath (3, 5), wherein at least one conductor loop (6) having at least one coil is arranged at the traction line (2, 4), wherein the traction line (2, 4) is electrically insulated from the at least one conductor loop (6).

Description

Technical Field

[0001] This invention relates to a traction grid in electric or hybrid vehicles. Background Technology

[0002] Such a traction power grid typically has a high-voltage source and an inverter, which are interconnected via traction lines. The high-voltage source is, for example, a high-voltage battery. In particular, the switching process of the inverter causes current fluctuations on the traction lines, resulting in time-varying magnetic fields that are relatively large due to the generally high current intensity. These magnetic fields can lead to EMV effects. Another problem is that current is induced in the vehicle body, which is thus heated. Consequently, interference noise can also be generated due to magnetostriction, piezoelectric effects, or force.

[0003] Magnetic fields can be transferred through permeable materials, but these materials are expensive and quickly reach saturation. Other measures include electrical shielding or reducing the distance between the traction lines. Shielding is problematic in terms of manufacturing and can also negatively impact the vehicle's EMV characteristics due to resonance effects. The distance from the traction lines cannot be arbitrarily small due to production specifications and insulation materials.

[0004] DE 10 2005 062 714 A1 discloses a cable having at least one first conductor and a second conductor, wherein the first conductor and the second conductor each have a plurality of insulated individual cables. Here, the plurality of individual cables of the first conductor and / or the plurality of individual cables of the second conductor are electrically connected to each other in the starting and / or ending regions of the cable, respectively. Here, at least one individual cable of the first conductor is arranged at least partially directly next to and substantially parallel to at least one individual cable of the second conductor, forming a single cable group therewith. The first and second conductors of the cable can here be used as traction lines in electric or hybrid vehicles. Summary of the Invention

[0005] The technical problem of this invention is to provide a traction power grid in which problems caused by magnetic fields induced through traction lines are reduced by simple means.

[0006] The solution to this technical problem is obtained through the traction power grid according to the present invention.

[0007] Therefore, the traction electrical grid in electric or hybrid vehicles includes a first traction line and a second traction line, each having an insulating sheath. At least one conductor loop (Leiterschleife) with at least one coil is arranged at the traction line, wherein the traction line and the at least one conductor loop are electrically insulated. The basic idea is that a transformed magnetic field induces a current in the at least one conductor loop. The magnetic field induced by the conductor loop is opposite to and weakens the magnetic field of the current in the traction line. The arrangement of the conductor loop relative to the traction line depends on the region where the total field generated should be minimized. Laying the conductor loop is cost-effective and simple compared to other known methods. Furthermore, the shielding effect can be adjusted via the cross-section of the conductor loop, where a larger cross-section is preferable due to lower ohmic resistance, allowing for a larger current.

[0008] In one embodiment, the conductor circuit has an insulating sheath so that it does not provide electrical feedback to other components due to the compensation current.

[0009] In another embodiment, at least one conductor loop is at least partially placed on the traction line. The advantage is the very small distance and the extremely simple possibility of securing the conductor loop. Therefore, the conductor loop can be connected to the traction line, for example, by means of cable ties, adhesive, or cable wrapping tape.

[0010] In another implementation, the conductor loop is at least partially integrated into the sheath of the traction line. This optimizes the structural space and further reduces the distance between the traction cable and the conductor loop.

[0011] In another embodiment, at least one conductor loop is arranged relative to the center point (zentrisch) of the traction line. Here, center point means that the connection between the center point of one traction line and the center point of the conductor loop is parallel to the connection between the center point of another traction line and the center point of another branch of the conductor loop.

[0012] In another implementation, at least one conductor loop has a rectangular cross-section, which achieves a very flat and compact structural form.

[0013] In another implementation, at least two conductor loops are arranged at the traction line.

[0014] In another implementation, the conductor circuit is made of copper or aluminum, which results in a correspondingly higher compensation current due to the higher conductivity. Attached Figure Description

[0015] The invention will now be explained in more detail with reference to preferred embodiments. Wherein:

[0016] Figure 1a A cross-section through the traction power grid in the first embodiment is shown.

[0017] Figure 1b A cross-section through the traction power grid in the second embodiment is shown.

[0018] Figure 1c A cross-section through the traction power grid in the third embodiment is shown.

[0019] Figure 1d A cross-section through the traction power grid in the fourth embodiment is shown.

[0020] Figure 1e A cross-section through the traction power grid in the fifth embodiment is shown.

[0021] Figure 1f A cross-section through the traction power grid in the sixth embodiment is shown.

[0022] Figure 1g A cross-section through the traction power grid in the seventh embodiment is shown.

[0023] Figure 1h A cross-section through the traction power grid in the eighth embodiment is shown.

[0024] Figure 1i A cross-section through the traction power grid in the ninth embodiment is shown.

[0025] Figure 2 It shows the basis Figure 1c A top view of the implementation form, and

[0026] Figure 3 A schematic diagram of the current is shown. Detailed Implementation

[0027] Figure 1a The diagram shows a cross-section through a portion of the traction power grid 1 in the first embodiment. The traction power grid has a first traction line 2 with an insulating sheath 3 and a second traction line 4 with an insulating sheath 5. Conductor loops 6, which are, for example, rectangular (see also...) are arranged above the traction lines 2 and 4. Figure 2Here, conductor loop 6 is arranged relative to the center of traction lines 2 and 4, i.e., the connecting line V1 between the center point of the first traction line 2 and the center point of one leg of conductor loop 6 is parallel to the connecting line V2 between the center point of the second traction line 4 and the other leg of conductor loop 6. Here, for example, the first traction line 2 is connected to the positive terminal of the high-voltage battery, while the second traction line 4 is connected to the negative terminal of the high-voltage battery. The time-varying magnetic field caused by the current fluctuations in traction lines 2 and 4 generates a compensating current in the closed conductor loop 6. The compensating current then also generates a magnetic field that weakens the magnetic field caused by the current in traction lines 2 and 4. Here, region B is schematically shown, which should be shielded from the magnetic field.

[0028] Figure 1b An alternative implementation is shown, wherein, according to Figure 1a The only difference in the implementation is that conductor circuit 6 has an insulating sheath 7. Here, conductor circuit 6 is also arranged centrally relative to traction lines 2 and 4.

[0029] Figure 1c Another alternative embodiment is shown, in which the conductor loop 6 or its sheath 7 is mounted on the traction lines 2, 4 or their sheaths 3, 5. Here, the conductor loop can be loosely mounted or fixed, for example using adhesive, cable ties, or wrapping tape.

[0030] Figure 1d Another alternative implementation is shown, in which the conductor loop 6 is not centrally arranged.

[0031] Figure 1e Another alternative embodiment is shown, in which conductor circuit 6 has two coils, with the outer coil centrally arranged and mounted on traction lines 2, 4. Alternatively, two conductor circuits 6, each with a corresponding coil, can also be used.

[0032] exist Figure 1f and Figure 1g Another alternative implementation is shown, in which, Figure 1f The middle conductor circuit has 6 parts grounded in the middle conductor circuit. Figure 1g The components are fully integrated into the traction lines 2 and 4, or more precisely, into their sheaths 3 and 5. This can be done, for example, during the manufacturing process of sheaths 3 and 5. It should be noted here that, according to... Figure 1g In the implementation, the sheath 7 can also be omitted.

[0033] Figure 1h One embodiment is shown in which the cross-section of the conductor loop 6 is not circular but rectangular, thereby achieving a very flat structural shape.

[0034] at last, Figure 1i An embodiment with two conductor loops 6 is shown, each conductor loop having a coil.

[0035] All the variations shown are advantageous for their respective applications in terms of shielding the area to be protected relative to the magnetic field.

[0036] Figure 2 The text shows the basis for... Figure 1c A top view of the implementation form.

[0037] at last, Figure 3 The diagram shows the direction of the flowing current used for operating conditions. Here, the current I in conductor loop 6 is shown in the section parallel to traction lines 2 and 4. L The current I in the associated traction lines 2, 4 T on the contrary.

[0038] List of reference numerals

[0039] 1 Traction power grid

[0040] 2 First Traction Line

[0041] 3 Sheath

[0042] 4 Second Traction Line

[0043] 5. Sheath

[0044] 6 Conductor circuits

[0045] 7. Sheath

[0046] I L Current in a conductor circuit

[0047] I T Current in the traction line

[0048] V1, V2 connecting cable.

Claims

1. A traction electrical grid (1) in an electric or hybrid vehicle, comprising traction lines (2, 4), namely a first traction line and a second traction line, wherein the first traction line and the second traction line each have insulating sheaths (3, 5). Its features are, At least one conductor circuit (6) having at least one coil is arranged at the traction lines (2,4), wherein the traction lines (2,4) are electrically insulated from the at least one conductor circuit (6), wherein the first traction line (2) is connected to the positive terminal of the high-voltage battery and the second traction line (4) is connected to the negative terminal of the high-voltage battery, and wherein one leg of the conductor circuit (6) is arranged at the first traction line (2) and the other leg of the conductor circuit (6) is arranged at the second traction line (4).

2. Traction power network according to claim 1, characterized in that The conductor circuit (6) has an insulating sheath (7).

3. Traction network according to claim 1 or 2, characterized in that The conductor circuit (6) is at least partially placed on the traction line (2,4).

4. Traction network according to claim 1 or 2, characterized in that The conductor circuit (6) is at least partially integrated into the sheath (3,5) of the traction line (2,4).

5. Traction network according to any of the preceding claims 1 to 2, characterized in that, At least one conductor loop (6) is arranged centrally relative to the traction lines (2,4).

6. Traction network according to any of the preceding claims 1 to 2, characterized in that, At least one conductor loop (6) has a rectangular cross-section.

7. Traction network according to any of the preceding claims 1 to 2, characterized in that, At least two conductor loops (6) are arranged at the traction lines (2,4).

8. Traction network according to any of the preceding claims 1 to 2, characterized in that, The conductor circuit (6) is made of copper or aluminum.

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