DE102017215419A1 - Capacitor unit and assembly for power electronics - Google Patents

Abstract

The invention relates to a capacitor unit (1; 16; 24) for power electronics, comprising at least two opposite-pole terminals (4, 5; 17, 18; 31, 32) for electrically connecting the capacitor unit (1; 16; 24) to a printed circuit board ( 2) or a power module (23). In order to lower parasitic connection inductances of the capacitor unit (1; 16; 24), each connection (4, 5) has a contact element (6, 7), the contact elements (6, 7) being adjacent and parallel to one another and spaced from one another , or each terminal (17, 18) a plurality of spaced in a row spaced, mutually parallel terminal lugs (19, 20), wherein the terminal lugs (19, 20) of the one terminal (17, 18) in the row in alternation are arranged with the terminal lugs (19, 20) of the other terminal (17, 18), or each terminal (25, 26) is formed as part of a press-fit connection.

Description

The invention relates to a capacitor unit for power electronics, comprising at least two opposite-pole terminals for electrically connecting the capacitor unit to a printed circuit board or to a power module. Furthermore, the invention relates to an assembly for power electronics, comprising a printed circuit board or a power module.

For applications in power electronics, for example in a DC-DC converter, a charger and the like, fast switching power semiconductors are needed, which in turn makes low-inductive DC link capacitors necessary. Foil capacitors are suitable for such applications because of the low acquisition costs, the self-healing properties and the low failure rate. However, film capacitors available today for such applications have high parasitic connection inductances. This inductive component generates problems in the application in power electronics, for example, a high overvoltage during fast switching operations.

In order to reduce the inductive component in the film capacitor, the electrical connections (HV (+) and HV (-) - busbars) can be designed so that a spatial distance between the two busbars is minimized. In addition, by an alternating Polkontaktierung of individual film capacitors of a DC link capacitor to the positive (+) and negative (-) power rails, the parasitic terminal inductance can be lowered, whereby the DC link capacitor has improved electrical properties. This allows a fully differential current distribution can be achieved, which provides a minimum inductance and homogeneous current utilization of the film capacitors. Each film capacitor is thereby supplied with power via its own connection cable ("connection finger"). In each of these connecting lines, however, a parasitic magnetic field is generated due to the current density.

JP H09-308267 A discloses a bus bar capacitor mounting arrangement for reducing the inductance of the bus bar and capacitor in the overvoltage protection capacitor wirings in an inverter circuit. For this purpose, a pair of opposing bus bars are provided with a plurality of parallel wiring means, wherein the connection means connected to the terminals of a capacitor are arranged at the constant pitch. Each of the capacitors is alternately connected in parallel in reverse order along the wiring means to provide different polarities of the positive and negative terminals. One of the terminals is opposed to the bus bar in the connection with the connecting means, while the other of the terminals faces in opposition to the connection means of the other bus bar.

US 2001/024353 A1 discloses a low voltage low inductance device for storing an electrical charge in a snubber circuit and a method for minimizing inductance in the snubber circuit using the device. The device, a capacitor, includes a plurality of parallel or serially connected elongate electrodes connected at one end to a positive conductor terminal and at another end to a negative conductor terminal such that ends of adjacent elongated electrodes alternate with the positive and negative ones Conductor connections connected. Accordingly, the current flowing through adjacent elongate electrodes is of substantially equal intensity but different in direction. As a result, the generated inductance effectively neutralizes that of adjacent extended electrodes. The method includes receiving an insulating film between the positive and negative conductor terminals and alternately connecting the conductor terminals to the ends of elongated electrodes so that current flows in opposite directions between the ends of adjacent elongate electrodes, thereby canceling the inductance.

CN 102 683 024 A discloses a capacitor unit having a plurality of capacitor monomers distributed in a capacitor array, an upper composite bus bar and a lower composite bus bar covering the top and bottom of the capacitor array, electrode plates led out on the same sides of the upper composite bus bar and the lower composite bus bar a terminal block made of insulating materials and disposed on the side where the electrode plates are led out onto the composite bus bars, and an insertion output terminal installed on the terminal block and electrically connected to the electrode plates.

An object of the invention is to reduce parasitic connection inductances of a capacitor unit mentioned above.

This object is solved by the independent claims. Advantageous embodiments are described in the dependent claims, the following description and the figures These refinements, taken alone or in a different combination of at least two of these embodiments, can represent a further developing or advantageous aspect of the invention with one another.

A capacitor unit according to the invention for power electronics comprises at least two opposing terminals for electrically connecting the capacitor unit with a printed circuit board or a power module, each terminal having a contact element, wherein the contact elements adjacent and parallel to each other and spaced from each other, or wherein each terminal more in a plurality of spaced apart, mutually parallel terminal lugs, wherein the terminal lugs of the one terminal in the row are arranged in alternation with the terminal lugs of the other terminal, or wherein each terminal is formed as part of a press-fit connection.

According to the invention, each terminal of the capacitor unit may have a contact element for electrically connecting the capacitor unit to a further electrical component, in particular a printed circuit board or a power module, wherein the contact elements are adjacent and parallel to each other and spaced from each other.

Each contact element may be formed block-shaped and elongated. Under a block-shaped design of the respective elongated contact element is an embodiment of the contact element as an elongated solid block with a polygonal, for example, square or rectangular, or rounded, for example, circular or elliptical, cross-sectional area to understand. The block-shaped contact element is therefore not formed, for example, plate-shaped, hollow or interrupted along its longitudinal extent. Under an elongated design of the respective block-shaped contact element is to be understood a design of the contact element, wherein the length of the contact element is greater by a multiple or multiple than the other dimensions, such as a width and a height of the contact element. As a result of the block-shaped and elongated design of the respective contact element, a relatively large contact area between the contact element or the connection and a further electrical component, in particular a printed circuit board, can be produced so that relatively strong currents can be transmitted via the contact element with relatively low losses ,

Under the adjacent and spaced arrangement of the opposite pole contact elements is an arrangement of the contact elements in a relatively small distance from each other to understand. In particular, the distance between the contact elements may be smaller by a multiple or a multiple than a length of the contact elements. The fact that the anti-polar contact elements are parallel to each other, should also mean that the distance between the contact elements along the longitudinal extension of the contact elements is constant. The constant distance between the mutually opposite contact elements can be realized by a rectilinear or at least partially curved configuration of the contact elements. Since the opposite-pole contact elements are adjacent and parallel to each other and spaced from each other, the inductances forming at an opposite current flow through the opposing contact elements can evenly compensate or cancel each other, whereby these parasitic Anschlußinduktivitäten eliminated or at least can be largely reduced.

According to the invention, alternatively, each terminal may comprise a plurality of terminal lugs spaced apart from one another and parallel to one another for electrically connecting the capacitor unit to a further electrical component, in particular a printed circuit board, the terminal lugs of one terminal in the row alternating with the terminal lugs of the other Connection are arranged.

That the terminal lugs are arranged in a row, to mean that the terminal lugs are arranged with respect to a rectilinear or at least partially curved imaginary imaginary line behind the other along this line to form the row. The fact that the terminal lugs in the row are spaced from one another means that the terminal lugs are spaced along the imaginary line. The terminal lugs of one terminal are spaced apart from one another in such a way that the distance between these terminal lugs is greater than a width of the terminal lugs of the other terminal given with respect to the imaginary line of the row. Preferably, the terminal lugs of each terminal in the row are equally spaced from each other.

As a result of the adjacent arrangement of the mutually opposite terminal lugs, the inductances forming in the case of an opposite current flow through the opposing terminal lugs can uniformly compensate each other or cancel each other, whereby these parasitic connection inductances can be eliminated or at least substantially reduced. The parasitic connection inductances are reduced the greater the larger the spatial resolution of the terminal lugs, that is, the more connecting lugs the series formed thereby has the same length of the series.

Alternatively, according to the invention, each connection may be formed as part of a press-fit connection. In particular, each connection can have at least one press-fit contact hole or at least one press-fit press-fit pin.

The press-fit technology is commonly used to connect a printed circuit board to a power module. The press-fit technology creates a positive connection between the printed circuit board and the power module. The basic principle of press-fit technology is the greater expansion of a press-fit press-in pin on the power module compared to a press-fit contact hole on the circuit board. When the press-fit press-fit pin is pressed into the press-fit contact hole, the press-fit press-in pin is plastically and / or elastically deformed and a gastight contact with low-resistance is produced. For this purpose, only low insertion forces are required with high holding forces.

The press-fit technology enables the production of reliable, solderless connections. Savings in the manufacturing process can be achieved in that the connection already comes about during the installation of the press-fit contact. A supply of solder and flux or a heat supply is not needed, but only a press-in force.

The formation of the electrical connections of the capacitor unit according to the invention as press-fit connection parts has the advantage that the capacitor unit can be directly connected to a power module without the interposition of a printed circuit board on which the capacitor unit is arranged and via a press-fit technology connected to the power module. This makes a printed circuit board unnecessary, which goes hand in hand with cost savings. In addition, the capacitor unit can be made more compact and space-saving and can be connected more flexibly to the power module. The pressing process, in which the capacitor unit is pressed against the power module, can take place with the aid of a centering device.

In contrast to the present invention, the connection is, for example, the capacitor unit according to CN 102 683 024 A problematic to the outside, since parasitic Anschlußinduktivitäten are generated, which are significantly higher than in the capacitor unit according to the invention. As a result, the capacitor unit according to the invention is particularly suitable for use in power electronics with fast-switching power semiconductors, since, for example, in the switching operations only a very small overvoltage is generated and / or lower switching losses are given.

The capacitor unit can be used, for example, to form a DC link of a DC-DC converter, a charger or the like. The capacitor unit may form a snubber capacitor.

According to an advantageous embodiment, at least one connection is arranged at the edge on a separate connection plate with which the film capacitors of the capacitor unit are electrically connected, which have mutually parallel longitudinal central axes and end-side arranged electrical connections. The use of corresponding connection plates makes a planar arrangement of the film capacitors possible in order to allow a compact design of the capacitor unit with a plurality of film capacitors. If the capacitor unit comprises the above-described contact elements, these can be arranged on the edge side on the respective connection plate and can be connected in a material-locking manner to the connection plate. If the capacitor unit comprises the connection lugs described above, these can be led out of the respective connection plate on the edge side and produced monolithically with the connection plate. Each film capacitor is designed as a film winding capacitor. Each film capacitor is cylindrically shaped and may have a circular or polygonal cross-sectional area which is oriented transversely to the longitudinal center axis of the film capacitor. The axial end surfaces of each film capacitor form its end faces, on each of which an electrical connection of the film capacitor is arranged. Due to the parallel arrangement of the longitudinal central axes of the film capacitors, these can be packed more tightly in order to be able to provide a compact capacitor unit. The longitudinal central axes of the film capacitors can run perpendicular to a portion of the respective connection plate with which the film capacitors are electrically connected. Preferably, each connection is arranged according to the edge on a separate connection plate. As a result, instead of the use of individual connections, a common electrical contacting of the film capacitors via the connection plates is possible.

A further advantageous embodiment provides that the connection plate on the edge side has an angled connection section facing away from the film capacitors, on which the connection is arranged. Thereby, a portion of the terminal plate, with which the film capacitors are electrically connected, perpendicular to a Be aligned mounting plane on which the capacitor unit is mounted. As a result, the height of the capacitor unit is independent of a height of the film capacitors, and instead depends on a width of the film capacitors and a stacking of the film capacitors in the height direction perpendicular to the mounting plane. At the connection portion, a contact element may be arranged, which runs parallel to a free end of the connection portion. Alternatively, the connection lugs may be arranged on the connection section, which lugs extend at least partially perpendicular to the connection section.

According to a further advantageous embodiment, each terminal lug is angled at a right angle. This also makes it possible for a section of the connecting plate, with which the film capacitors are electrically connected, to be aligned perpendicular to a mounting plane on which the capacitor unit is mounted. Each terminal lug may have a curved course or at least one bending line extending transversely to the longitudinal extension of the connection lug.

According to a further advantageous embodiment, the capacitor unit comprises at least two inner terminal plates of a first polarity, which are arranged adjacent to opposite end faces of each film capacitor, at least two outer terminal plates of a second polarity, which are arranged on the film capacitors opposite sides of the inner terminal plates, and at least two electrical insulating layers, which are each arranged between an inner terminal plate and an outer terminal plate, wherein adjacent film capacitors are electrically connected via their electrical connections on each of the two end faces alternately with the local terminal plates, wherein on the inner terminal plates perforations are formed through which the electrically connected to the outer terminal plates connected electrical connections of the film capacitors. This embodiment achieves a better current distribution and lower parasitic inductances of the connections between the film capacitors and the terminal plates. According to this embodiment, a positive terminal plate and a negative terminal plate are present on each of the end faces, between which the respective electrical insulating layer is arranged. Since adjacent film capacitors are electrically connected in alternation via their electrical connections on each of the two end faces to the terminal plates there, inductances realized by these connections can compensate each other or cancel each other out.

According to a further advantageous embodiment, the capacitor unit comprises at least one U-shaped inner terminal plate of a first polarity, at least one U-shaped outer terminal plate of a second polarity, which surrounds the inner terminal plate outside at least partially, and at least one between the inner terminal plate and the outer connecting plate arranged electrical insulating layer, wherein each connecting plate two parallel to each other and spaced from each other extending legs, with which foil capacitors of the capacitor unit, the mutually parallel longitudinal central axes and frontally arranged electrical connections are electrically connected, and having a leg interconnecting web, wherein At least one press-fit contact hole is arranged on each web, wherein at the web of the outer connecting plate one with the press-fit contact hole at the web of the Ren the connecting plate aligned, greater than this press-fit contact hole sized opening is formed, and wherein at the web of the inner terminal plate with the press-fit contact hole on the web of the outer terminal plate aligned larger than this press-fit contact hole dimensioned Aperture is formed. After that, the electrical connections of the capacitor unit are thus each formed by at least one press-fit contact hole, preferably in each case by two or more press-fit contact holes. Press-fit press-fit pins are correspondingly arranged on the power module, so that the electrical connection between the capacitor unit and the power module can be produced in a simple manner by pressing the capacitor unit onto the power module. The respective press-fit contact hole can be predrilled, for example. By sufficient dimensioning of the connection plates, a carrying of the direct current is possible. For this purpose, no additional DC busbars are needed. The connection plates or their shape also allow easy coupling to a busbar.

A further advantageous embodiment provides that adjacent film capacitors are electrically connected via their electrical connections on each of the two end faces alternately with the local legs, wherein on the legs of the inner terminal plate openings are formed through which the electrically connected to the legs of the outer terminal plate connected electrical connections of the film capacitors run. The design achieves a better current distribution and lower parasitic inductances of the connections between the film capacitors and the terminal plates. According to this embodiment are on each of the end faces a positive leg and a negative leg exist, between which the respective electrical insulating layer is arranged. Since adjacent film capacitors are electrically connected in alternation via their electrical connections on each of the two end faces to the legs there, inductances realized by these connections can compensate each other or cancel each other out.

According to a further advantageous embodiment, the capacitor unit comprises at least one housing, in which the film capacitors and the terminal plates are arranged and on which an opening is formed for each electrical connection of the capacitor unit. The housing protects the components arranged therein, in particular against contact during the pressing of the capacitor unit to a power module.

Advantageously, the electrical connections of the film capacitors are connected by soldering, resistance welding or laser welding to the respective connection plate.

An assembly according to the invention for power electronics comprises at least one printed circuit board or a power module and at least one capacitor unit according to one of the aforementioned embodiments or any combination of at least two of these configurations with each other, which is electrically connected via their terminals to the circuit board or the power module.

With the assembly, the advantages mentioned above with respect to the condenser unit are connected accordingly. The printed circuit board preferably represents a preferably low-inductive reference plane.

According to an advantageous embodiment, the circuit board is designed as a multilayer board. The capacitor unit is to be designed in this case for mounting on a multilayer board.

A further advantageous embodiment provides that the connections of the capacitor unit are connected to the circuit board by soldering, resistance welding, laser welding or in each case via at least one screw connection. If the capacitor unit has, for example, block-shaped contact elements, the contact elements can each be connected, for example via at least one screw connection, to the printed circuit board. If the capacitor unit includes the terminal lugs, these can be connected to the printed circuit board, for example via an SMT soldering method.

• 1 eine schematische Darstellung eines Ausführungsbeispiels für eine erfindungsgemäße Baugruppe;
• 2 eine schematische Darstellung eines Abschnitts der in 1 gezeigten Kondensatoreinheit;
• 3 eine schematische und perspektivische Darstellung eines Abschnitts eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Kondensatoreinheit;
• 4 eine schematische Darstellung eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Baugruppe vor einer Montage; und
• 5 eine schematische Darstellung der in 4 gezeigten Baugruppe nach der Montage.

Further details, features and advantages of the invention will become apparent from the following description and the figures. Show it:

• 1 a schematic representation of an embodiment of an assembly according to the invention;
• 2 a schematic representation of a portion of in 1 shown capacitor unit;
• 3 a schematic and perspective view of a portion of another embodiment of a capacitor unit according to the invention;
• 4 a schematic representation of another embodiment of an assembly according to the invention prior to assembly; and
• 5 a schematic representation of in 4 shown assembly after assembly.

In the figures, identical or functionally identical components are provided with the same reference numerals.

1 shows a schematic representation of an embodiment of an assembly according to the invention 1 for a power electronics, not shown.

The assembly 1 includes a printed circuit board 2 and a capacitor unit 3 that have two pairs of opposite polarity connections 4 and 5 electrically with the circuit board 2 connected is. The circuit board 2 can be designed as a multilayer board. The connections 4 and 5 the condenser unit 3 can by soldering, resistance welding, laser welding or in each case via at least one screw connection, not shown, with the circuit board 2 be connected.

Every connection 4 respectively. 5 comprises a block-shaped, rectilinear and elongated contact element 6 respectively. 7 , wherein the contact elements 6 and 7 of the respective pair of opposite polarity terminals 4 and 5 adjacent and parallel to each other and spaced from each other. Each contact element 6 respectively. 7 has a rectangular cross-sectional area. A height of the contact elements 7 starting from the circuit board 2 is smaller than a height of the contact elements 6 ,

Every connection 4 respectively. 5 is on the edge of a separate connection plate 8th respectively. 9 is arranged with the eight cylindrical film capacitors 10 the condenser unit 3 are electrically connected, the mutually parallel longitudinal central axes and frontally arranged, not shown electrical connections. For this purpose, each connecting plate 8th respectively. 9 one edge of the film capacitors 10 pointing away, angled connection section 11 respectively. 12 on, on which the respective connection 4 respectively. 5 is arranged. The electrical connections of the film capacitors 10 can by soldering, resistance welding or laser welding with the respective connecting plate 8th respectively. 9 be connected.

Consequently, the capacitor unit comprises 3 two inner connecting plates 9 a first polarity adjacent to opposite end faces of each film capacitor 10 are arranged, two outer connecting plates 8th a second polarity on the film capacitors 10 opposite sides of the inner connecting plates 9 are arranged, and two electrical insulating layers 13 , each between an inner connecting plate 9 and an outer connection plate 8th are arranged.

Adjacent foil capacitors 10 are on their electrical connections on each of the two end faces alternately electrically with the local connection plates 8th and 9 connected. These are on the inner connecting plates 9 not shown openings formed by the electrically connected to the outer terminal plates 8th connected electrical connections of the film capacitors 10 run, as shown schematically in 2 is shown.

2 shows a schematic representation of a portion of in 1 shown capacitor unit 3 , It is particularly shown how adjacent film capacitors 10 over their electrical connections 14 on each of the two faces in alternation electrically with the local connection plates 8th and 9 are connected. In addition, these are on the inner connecting plates 9 trained openings 15 shown by the electrically connected to the outer connecting plates 8th connected electrical connections 14 the film capacitors 10 run.

3 shows a schematic and perspective view of a portion of another embodiment of a capacitor unit according to the invention 16 for a power electronics, not shown. The condenser unit 16 can down to their connections 17 and 18 according to the in the 1 and 2 be shown embodiment, which is why to avoid repetition of the above description of the 1 and 2 is referenced. In the following, only the differences to those in the 1 and 2 shown embodiment described.

Every connection 17 respectively. 18 the condenser unit 16 includes according to 3 five in a row spaced apart, mutually parallel terminal lugs 19 respectively. 20 , Depending on your needs but can also more or less connecting lugs 19 respectively. 20 be provided. The connection flags 19 of a connection 17 are in turn in alternation with the terminal lugs 20 the other connection 18 arranged. Each connection banner 19 respectively. 20 is formed bent at a right angle and thereby has a contact surface 21 on, over which the connecting lugs 19 and 20 are electrically connected to a printed circuit board, not shown. The two other not shown connections of the capacitor unit 16 are preferably formed accordingly.

4 shows a schematic representation of another embodiment of an assembly according to the invention 22 before a montage.

The assembly 22 includes a power module 23 and a capacitor unit 24 that have two opposite polarity connections 25 and 26 electrically with the power module 23 can be connected as it is in 5 is shown. At the power module 23 are two opposite polarity electrical connections 27 and 28 arranged, each by four press-fit press-fit pins 29 are formed.

Every connection 25 respectively. 26 is designed as part of a press-fit connection. In particular, each connector has 25 respectively. 26 four press-fit contact holes 30 in which the press-fit press-fit pins 29 of the power module 23 can be pressed.

The condenser unit 24 comprises a U-shaped inner connecting plate 31 a first polarity, a U-shaped outer outer plate 32 a second polarity, the inner connecting plate 31 outside at least partially surrounds, and one between the inner connecting plate 31 and the outer connection plate 32 arranged electrical insulating layer 33 ,

Each connecting plate 31 respectively. 32 comprises two legs parallel to each other and spaced from each other 34 and 35 respectively. 36 and 37 , with which film capacitors 10 the condenser unit 24 , the longitudinal center axes arranged parallel to one another and electrical connections arranged on the end side 14 have, are electrically connected. Furthermore, each connecting plate includes 31 respectively. 32 one the thighs 34 and 35 respectively. 36 and 37 interconnecting bridge 38 respectively. 39 ,

At the footbridge 38 of the inner connecting plate 31 and at the footbridge 39 of the outer connection plate 32 There are four press-fit contact holes each 30 arranged. At the footbridge 39 of the outer connection plate 32 is one with the press-fit vias 30 at the footbridge 38 of the inner connecting plate 31 aligned, larger than that these press-fit contact holes 30 formed entity sized aperture 40 educated. At the footbridge 38 of the inner connecting plate 31 one with the press-fit contact holes 30 at the footbridge 39 of the outer connection plate 32 aligned, larger than the through these press-fit contact holes 30 formed entity sized aperture 41 educated.

Adjacent foil capacitors 10 are about their electrical connections 14 on each of the two end faces alternately electrically with the local thighs 34 and 36 respectively. 35 and 37 connected. On the thighs 34 and 35 of the inner connecting plate 31 not shown openings are formed through which the electrically with the legs 36 and 37 of the outer connection plate 32 connected electrical connections 14 the film capacitors 10 run. The electrical connections 14 the film capacitors 10 can by soldering, resistance welding or laser welding with the respective connecting plate 31 respectively. 32 be connected.

The condenser unit 24 further comprises a housing 42 in which the film capacitors 10 and the connection plates 31 and 32 are arranged. On the case 42 is for every electrical connection 25 respectively. 26 the condenser unit 24 one opening each 43 educated. The housing 42 may be partially or completely made of a plastic.

It should be noted that the number of press-fit press-fit pins 29 and press-fit contact extinguishers 30 can be changed according to requirements.

5 shows a schematic representation of the in 4 shown assembly 22 after assembly. The press-fit press-fit pins 29 are in the press-fit contact holes 30 pressed, causing the capacitor unit 24 frictionally directly with the power module 23 connected is. The press-fit press-fit pins 29 of the power module 23 extend partially through the respective opening 40 respectively. 41 on the inner connecting plate 31 or outer connection plate.

LIST OF REFERENCE NUMBERS

1

module

2

circuit board

3

condenser unit

4

Connection of 3

5

Connection of 3

6

Contact element of 4

7

Contact element of 5

8th

Flashing

9

Flashing

10

film capacitor

11

Connection section of 8

12

Connection section of 9

13

insulating

14

Connection of 10

15

Breakthrough at 9

16

condenser unit

17

Connection of 16

18

Connection of 16

19

Connection flag of 17

20

Connection flag of 18

21

Contact area of 19, 20

22

module

23

power module

24

condenser unit

25

Connection of 24

26

Connection of 24

27

Connection of 23

28

Connection of 23

29

Press-fit press-fit pin

30

Press-fit contact hole

31

inner connecting plate

32

outer connection plate

33

insulating

34

Thighs of 31

35

Thighs of 31

36

Thighs of 32

37

Thighs of 32

38

Footbridge of 31

39

Footbridge of 32

40

Opening at 39

41

Opening at 38

42

casing

43

Breakthrough of 42

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP H09308267 A [0004]
• US 2001024353 A1 [0005]
• CN 102683024A [0006, 0020]

Claims (12)

Capacitor unit (1; 16; 24) for power electronics, comprising at least two opposite polarity terminals (4, 5; 17, 18; 25, 26) for electrically connecting the capacitor unit (1; 16; 24) to a printed circuit board (2) or a power module (23), characterized in that each terminal (4, 5) has a contact element (6, 7), wherein the contact elements (6, 7) are adjacent and parallel to each other and spaced from each other, or that each terminal ( 17, 18) in the row spaced apart, mutually parallel terminal lugs (19, 20), wherein the terminal lugs (19, 20) of the one terminal (17, 18) in the row in alternation with the terminal lugs (19, 20) of the other terminal (17, 18) are arranged, or that each terminal (25, 26) is formed as part of a press-fit connection. Condenser unit (1; 16) after Claim 1 , characterized in that at least one connection (4, 5, 17, 18) is arranged at the edge on a separate connecting plate (8, 9), to which foil capacitors (10) of the capacitor unit (1, 16) are connected in parallel arranged longitudinal central axes and frontally arranged electrical connections (14). Condenser unit (1; 16) after Claim 2 , characterized in that the connecting plate (8, 9) on the edge side of the film capacitors (10) facing away, angled connecting portion (11, 12) on which the terminal (4, 5, 17, 18) is arranged. Capacitor unit (16) according to one of Claims 1 to 3 , characterized in that each connecting lug (19, 20) is angled at a right angle. Condenser unit (1; 16) according to one of Claims 2 to 4 characterized by at least two inner terminal plates (9) of a first polarity, which are arranged adjacent to opposite end faces of each film capacitor (10), at least two outer terminal plates (8) of a second polarity, on the film capacitors (10) facing away from the inner Terminal plates (9) are arranged, and at least two electrical insulating layers (13), each between an inner terminal plate (9) and an outer terminal plate (8) are arranged, wherein adjacent film capacitors (10) via their electrical connections (14) on each the two end faces in alternation are electrically connected to the local connection plates (8, 9), wherein openings (15) are formed on the inner connection plates (9), through which the electrical connections (14) electrically connected to the outer connection plates (8). the film capacitors (10) run. Condenser unit (24) after Claim 1 characterized by at least one U-shaped inner connecting plate (31) of a first polarity, at least one U-shaped outer connecting plate (32) of a second polarity, which surrounds the inner connecting plate (31) on the outside at least partially, and at least one between the inner terminal plate (31) and the outer terminal plate (32) arranged electrical insulating layer (33), wherein each connecting plate (31, 32) has two mutually parallel and spaced apart legs (34, 35, 36, 37), with which film capacitors (10 ) of the capacitor unit (24) having mutually parallel longitudinal central axes and frontally arranged electrical connections (14) are electrically connected, and a leg (34, 35, 36, 37) interconnecting web (38, 39), wherein at least one press-fit contact hole (30) is arranged on each web (38, 39) in each case, wherein on the web (39) of the outer Anschlußbl echs (32) a with the press-fit contact hole (30) on the web (38) of the inner terminal plate (31) aligned, larger than this press-fit contact hole (30) sized aperture (40) is formed, and wherein on the web (38) of the inner terminal plate (31) with the press-fit contact hole (30) on the web (39) of the outer terminal plate (32) aligned, larger than this press-fit contact hole (30) sized opening (41) is formed. Condenser unit (24) after Claim 6 , characterized in that adjacent film capacitors (10) via their electrical connections (14) on each of the two end faces in alternation electrically connected to the local legs (34, 35, 36, 37) are connected, wherein on the legs (34, 35) apertures are formed through which the electrical connections (14) of the film capacitors (10), which are connected electrically to the legs (36, 37) of the outer connection plate (32), extend through the inner connection plate (31). Condenser unit (24) after Claim 6 or 7 , characterized by at least one housing (42), in which the film capacitors (10) and the connection plates (31, 32) are arranged and on which for each electrical connection (25, 26) of the capacitor unit (24) in each case an opening (43) is trained. Capacitor unit (1; 16; 24) according to one of Claims 5 to 8th , characterized in that the electrical connections (14) of the film capacitors (10) by soldering, resistance welding or Laser welding with the respective connecting plate (8, 9, 31, 32) are connected. An assembly (1; 22) for power electronics, comprising at least one printed circuit board (2) or at least one power module (23), characterized by at least one capacitor unit (1; 16; 24) according to one of Claims 1 to 9 which is electrically connected via its terminals (4, 5; 17, 18; 25, 26) to the printed circuit board (2) or the power module (23). Assembly (1) after Claim 10 , characterized in that the printed circuit board (2) is designed as a multilayer board. Assembly (1) after Claim 10 or 11 , characterized in that the terminals (4, 5, 17, 18) of the capacitor unit (1; 16) are connected to the circuit board (2) by soldering, resistance welding, laser welding or in each case via at least one screw connection.

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