Capacitor module
By dividing the windings of the capacitor module into two groups and connecting them to the contact portion, a compact arrangement of the center tap is achieved, solving the problem that the existing capacitor module structure is not compact enough, simplifying the contact process and reducing parasitic inductance, making it suitable for connection to inverters and EMV filters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- VOLKSWAGEN AG
- Filing Date
- 2025-10-27
- Publication Date
- 2026-05-01
AI Technical Summary
Existing capacitor modules are not compact enough to meet the requirements of three-level inverters when the center tap needs to be connected to the inverter.
Design a capacitor module in which the winding is divided into two groups and connected to the first, second and third contact portions respectively. The contact portions have a comb-like or strip-like structure and are connected to other components through taps to achieve a compact arrangement of the middle taps.
It achieves a compact structure for the capacitor module, simplifies the contact process, reduces parasitic inductance, and improves potential isolation, making it suitable for connecting inverters and EMV filters.
Smart Images
Figure CN121964385A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a capacitor module. Background Technology
[0002] A capacitor module has a large number of capacitors, often constructed as windings. Here, the windings have electrodes at their ends, which are contacted via contact portions, wherein the peripheral surfaces of the windings are electrically insulated. The windings can be arranged very compactly in rows or matrices, where one contact portion contacts the electrode at one end and another contact portion contacts the electrode at the other end, thus electrically paralleling the windings and superimposing their capacitances. One application of such a capacitor module is as an intermediate circuit capacitor in an inverter. In this case, contact elements are connected to the positive and negative terminals of the inverter.
[0003] In various applications, it is necessary to connect capacitors in series with center taps, such as when a center circuit capacitor is used in a three-level inverter. However, series connection of capacitors is also required in other circuit configurations. One solution would be to connect two known capacitor modules in series. Summary of the Invention
[0004] The technical problem of this invention is to provide a compact capacitor module with a center tap.
[0005] The solution to this technical problem is obtained by the capacitor module according to the present invention. Further preferred designs of the present invention are derived from the specification.
[0006] This capacitor module has multiple windings, each winding having an electrode at its end and its peripheral surfaces electrically insulated. The windings are divided into two groups. Furthermore, the capacitor module has a first contact portion, a second contact portion, and a third contact portion, wherein the first contact portion is connected to one electrode of each winding. Here, the first contact portion forms a center tap of the capacitor module. The second contact portion is connected to the other electrodes of the first group of windings, and the third contact portion is connected to the other electrodes of the second group of windings. This allows for a very compact structure of the capacitor module with the center tap.
[0007] In one embodiment, the windings are arranged in at least one row, wherein the windings of the first group and the windings of the second group are alternately arranged within that row. Alternating in pairs or triplets is also possible. Additional rows can be arranged parallel to this row, all constructed identically. The second and third contact portions contact the electrodes from the upper side, wherein the second and third contact portions have a comb-like or strip-like contact structure, and wherein the first contact portion is arranged on the lower side. The upper and lower sides can also be interchanged and are used here only to distinguish the end sides. It is important only that the first contact portion contacts all electrodes of all windings from one side.
[0008] In an alternative embodiment, the windings are arranged in at least one row, wherein the first group of windings is arranged in the first portion of the row and the second group of windings is arranged in the second portion of the row, wherein the first contact portion is arranged on the lower side of the capacitor module, and wherein the second and third contact portions contact the electrodes of their associated windings from the upper side. The terms "upper side" and "lower side" apply as previously stated. The advantage of this embodiment is that the first and second groups of windings are arranged spatially as cells, thereby simplifying the contact process, although the parasitic inductance is slightly larger.
[0009] In another alternative embodiment, the windings of the first group and the windings of the second group are arranged overlapping each other, with a first contact portion positioned between the two groups, and a second contact portion contacting the electrodes from the top and a third contact portion from the bottom. The advantage is that the second and third contact portions are spatially separated, thus simplifying the isolation between potentials. Here, the capacitor module is taller, although the structural volume is similar to that in other embodiments.
[0010] In another embodiment, at least a single contact portion is constructed in a plate-like or track-like manner. A bend may also be arranged at the plate-like element.
[0011] Here, the plate-like element may have holes in the region of the winding electrodes, wherein, for example, contact tabs are arranged at the edges of the holes, which can then be brazed or welded to the electrodes. The holes can be formed, for example, by drilling, punching, or milling. The holes are preferably round, but this is not mandatory.
[0012] In another embodiment, the contact portion correspondingly has at least one tap so that the capacitor module can be more easily connected to other components (e.g., inverters) and / or other filters (e.g., EMV filters).
[0013] In another embodiment, the capacitor module is filled with a potting compound (e.g., molding compound), wherein the tap is at least partially exempt from the potting compound.
[0014] In another embodiment, the second and / or third contact portions each have at least two taps, allowing the capacitor module to be connected to multiple components. Furthermore, these at least two taps can be used to set better sensing performance.
[0015] In another embodiment, the capacitor module has an additional capacitor connected to the contact portion. Therefore, filtering elements can be integrated into the capacitor module, for example. Attached Figure Description
[0016] The invention will now be described in more detail with reference to preferred embodiments. (See attached figures.) Figure 1 A perspective view of the capacitor module is shown. Figure 2 An exploded view of the contact area is shown. Figure 3 A perspective view of the capacitor module in the second embodiment is shown. Figure 4 A perspective view of the capacitor module in the third embodiment is shown. Detailed Implementation
[0017] exist Figure 1 The diagram shows a capacitor module 1 with six windings 2 serving as capacitors. The windings 2 are arranged in a row, with electrodes at corresponding end sides 3 and 4, and the peripheral surfaces 5 are electrically insulated. Here, end side 3 is associated with the upper side and end side 4 with the lower side, where the names are for orientation only and the actual construction of the capacitor module 1 may vary. The windings 2 are divided into two groups. In terms of counting, the first, third, and fifth windings 2 from front to back are associated with the first group, while the second, fourth, and sixth windings 2 are associated with the second group. In addition, the capacitor module 1 has a first contact portion 6, a second contact portion 7, and a third contact portion 8. The first contact portion 6 has a plate-like element 9 and a bend 10 in the form of another plate, which extends perpendicularly from the edge of the plate-like element 9, wherein three taps 11 branch off at the bend 10, which extend parallel to the plate-like element 9 (see also...). Figure 2 The winding 2 is arranged on the plate element 9 with its end side 4. The second contact portion 7 is used to contact the electrode of the end side 3 of the first winding 2. The second contact portion 7 has a plate element 12 from which a comb-shaped contact structure 13 extends, which contacts the electrode of the winding 2 and has three taps 14 arranged at its end.
[0018] Additionally, the second contact portion 7 has a bend 15 perpendicular to the plate-shaped element 12, and an additional tap 16 is arranged on its upper side, which is perpendicular to the bend and parallel to the comb-shaped contact structure 13 (see also...). Figure 2 The third contact portion 8 is also constructed accordingly, wherein the elements of the third contact portion 8 are provided with the same reference numerals as those for the second contact portion 7. The capacitor module 1 can be connected, for example, to an inverter via taps 11, 14, and the capacitor module 1 can be connected to an EMV filter, for example, having X-type and Y-type capacitors and an inductor, via tap 16.
[0019] It should be noted that the plate element 9 may have holes (not shown) in the region of the electrodes of the winding 2, wherein contact pieces are arranged at the edges of the holes. The contact pieces can then be brazed or welded to the electrodes.
[0020] exist Figure 3The diagram illustrates an alternative embodiment of capacitor module 1. Here, the two sets of windings 2 are arranged in two overlapping rows. The first set of windings 2 is arranged in the first row R1, and the second set of windings 2 is arranged in the second row R2. A first contact portion 6 is arranged between the two rows R1 and R2 of windings 2, having a plate-like element 9, a bend 10, and a tap 11. Here, the first contact portion 6 contacts the electrode on the end side 3 of the first row R1 of winding 2 and the electrode on the end side 4 of the second row R2 of winding 2 with its plate-like element 9. The second contact portion 7 has a plate-like element 17 and a bend 18, from which a tap 14 oriented parallel to the plate-like element 17 branches out. The plate-like element 17 contacts the electrode on the end side 4 of the first row R1 of winding 2. The third contact portion 8 also has a plate-like element 19 from which the tap 14 branches out in the same plane. The plate-like element 19 contacts the electrode on the end side 3 of the second row R2 of winding 2. Here, winding 2 only needs to be designed for half of the total voltage of capacitor module 1. The first and second sets of winding 2 can also have more than one row and any matrix shape. It should be noted that tap 16 may also be present in this embodiment.
[0021] exist Figure 4 Another alternative embodiment of capacitor module 1 is shown. Here, the windings 2 are arranged in a row. The first three windings 2 of the row are associated with the first group, and the last three windings 2 of the row are associated with the second group. The first contact portion 6 contacts all the electrodes of the contact end side 4 on the lower side (as shown in the figure). Figure 1 (As in the embodiment). The second contact portion 7 and the third contact portion 8 respectively have plate-shaped elements 17 or 19, which connect to the electrode on the upper contact end side 3. Here, the second contact portion 7 also has a bend 20 from which a tap 16 branches out. In this embodiment, multiple rows of windings can also be arranged in parallel.
[0022] List of reference numerals 1 Capacitor Module 2 windings 3 end sides 4 end sides 5. Side circumferential surface 6 First Contact Part 7 Second Contact Part 8 Third Contact Part 9 plate components 10. Bend 11 taps 12 plate components 13. Comb-shaped contact structure 14 taps 15. Bend 16 taps 17 plate components 18. Bend 19 plate components 20. Bend Lines R1 and R2.
Claims
1. A capacitor module (1), wherein, The capacitor module (1) has multiple capacitors as windings (2), wherein each winding (2) has an electrode at its end (3,4), and the side circumferential surface (5) of the winding (2) is electrically insulated. The windings (2) are divided into two groups. The capacitor module (1) has a first contact portion (6), a second contact portion (7), and a third contact portion (8). The first contact portion (6) is connected to one electrode of each winding (2), the second contact portion (7) is connected to the other electrodes of the first group of windings (2), and the third contact portion (8) is connected to the other electrodes of the second group of windings (2).
2. The capacitor module according to claim 1, characterized in that, The windings (2) are arranged in at least one row, wherein the windings (2) of the first group and the windings of the second group are arranged alternately in the row, wherein the second contact portion (7) and the third contact portion (8) contact the electrodes of the windings (2) from the upper side of the capacitor module (1), wherein the second contact portion (7) and the third contact portion (8) have a comb-shaped contact structure (13) or a strip-shaped contact structure, wherein the first contact portion (6) is arranged on the lower side.
3. The capacitor module according to claim 1, characterized in that, The windings (2) are arranged in at least one row, wherein the windings (2) of the first group are arranged in the first part of the row and the windings (2) of the second group are arranged in the second part of the row, wherein the first contact portion (6) is arranged on the lower side of the capacitor module (1), and wherein the second contact portion (7) and the third contact portion (8) contact the electrodes of their associated windings (2) from the upper side.
4. The capacitor module according to claim 1, characterized in that, The first group of windings (2) and the second group of windings (2) are arranged overlapping each other, wherein the first contact portion (6) is arranged between the two groups, wherein the second contact portion (7) contacts the electrode from the top and the third contact portion (8) contacts the electrode from the bottom, or vice versa.
5. The capacitor module according to any one of the preceding claims, characterized in that, At least each contact portion (6-8) is constructed in a plate-like or track-like manner.
6. The capacitor module according to any one of the preceding claims, characterized in that, The contact portions (6-8) each have at least one tap (11, 14; 16).
7. The capacitor module according to claim 6, characterized in that, The capacitor module (1) is filled with filler material, wherein the taps (11, 14; 16) are at least partially exempt from filler material.
8. The capacitor module according to claim 6 or 7, characterized in that, The second contact portion (7) and / or the third contact portion (8) respectively have at least two taps (14, 16).
9. The capacitor module according to any one of the preceding claims, characterized in that, The capacitor module (1) has an additional capacitor connected to one of the contact portions (6-8).