EP3138370A1

EP3138370A1 - High current switch

Info

Publication number: EP3138370A1
Application number: EP15718140.5A
Authority: EP
Inventors: Wolfgang Ullermann; Peter Meckler; Manuel ENGEWALD; Matthias Schwarz; Ewald Schneider; Markus Miklis
Original assignee: Ellenberger and Poensgen GmbH
Current assignee: Ellenberger and Poensgen GmbH
Priority date: 2014-04-30
Filing date: 2015-04-04
Publication date: 2017-03-08
Also published as: KR20160148586A; US10070514B2; CN106465534A; US20170048971A1; WO2015165568A1; KR101996669B1; DE102014006346A1

Abstract

The invention relates to a high current switch (2), in particular for a motor vehicle, comprising a first bus bar (4), a second bus bar (6) in addition to a first semi-conductor switch (16) which comprises a control connection (26) and a first transmission connection (20) as well as a second transmission connection (22). Said first transmission connection (20) is placed in direct contact with the first bus bar (4) and the second transmission connection (22) is placed in direct electric contact with the second bus bar (6).

Description

description

High current switch

The invention relates to a high-current switch. By high-current switch is meant in particular a controllable switch for transmitting and switching of electrical currents with a current between 50A and 300A. The high current switch is preferably used in the automotive field, e.g. inside a commercial vehicle.

Commercial vehicles, z. As refrigerated trucks, have electrically operated ancillaries, such as in particular a cooling system or lifts. For operation, therefore, a switching of the respective unit supplying the power circuit is required, which is usually done by means of a high-current switch. The on-board network of commercial vehicles has an electrical voltage of 24 V. In order to supply comparatively powerful auxiliary units, it is therefore necessary to switch currents with a comparatively large current intensity. Therefore, the high-current switch typically includes a high-current circuit board having a main body with thick-film conductor interlayers to which power semiconductor switches are electrically contacted. The thickness of these copper layers is up to 400 pm. The costs for producing such basic bodies are comparatively high.

From EP 0 590 643 B1 a high-current printed circuit board arrangement is known, which has a printed circuit board as well as a bus bar, which is spaced from the printed circuit board. By means of the busbar the energization of fasteners of the circuit board is done.

The invention has for its object to provide a particularly suitable high-current switch, which is suitably inexpensive. This object is achieved by the features of claim 1. Advantageous developments and refinements are the subject of the dependent claims.

The high-current switch has a first busbar and a second busbar, which are in particular of a similar construction. In other words, the first and second busbars do not differ. The first and the second busbar form a connection of the high-current switch to other components of a circuit. For this purpose, the busbars, for example, at one end terminals, openings, in particular holes, or the like. The busbars are suitably self-supporting. In other words, the busbars are comparatively solid and / or rigid. The busbars are not part of a printed circuit board and expediently not made by etching or partial removal of a conductive layer, such as a copper layer. Advantageously, the busbars are produced as a stamped and bent part from a metal sheet or cut by laser cutting from a comparatively solid sheet.

The busbars are made of an electrically conductive material, such as copper or aluminum. Each of the busbars is intended and adapted to carry an electric current with a current intensity of in particular over 50 A, 100 A, 150 A, 200 A, 250 A and up to at least 300 A, 350 A, 400 A or 450 A, wherein the electrical voltage is suitably greater than or equal to 12 V, 24 V, 48 V and suitably less than 60 V. The high current switch further comprises a first semiconductor switch, in particular a transistor. Suitably, the first semiconductor switch is a MOSFET or IGBT. The first semiconductor switch has a first transmission connection, a second transmission connection and at least one control connection. By means of the control terminal of the first semiconductor switch can be controlled. By applying a comparatively low electrical voltage, it is possible to convert the first semiconductor switch from a conductive state to a non-conductive state or vice versa. In other words, in this way a comparatively low-resistance electrical connection between the first transmission port and the second transmission port made or canceled. Consequently, by means of applying the electrical voltage to the control connection, the electrical resistance between the first transmission connection and the second transmission connection is adjustable from a comparatively low-resistance, in particular less than 0.1 Ω, to a comparatively high electrical resistance, for example 1 kü. The first semiconductor switch is expediently provided and set up so that an electrical voltage of 12 V, 24 V or 48 V is applied to its transmission connections. The current carrying capacity of the first semiconductor switch, that is, the maximum of the first Ubertragungsanschluss to the second Ubertragungsanschluss flowing electrical current, for example, has a current of at least 10 A, 20 A, 30 A, 40 A, 50 A, 00 A, 150 A, 200 A or 250 A and suitably up to 300 A, 350 A, 400 A up. In summary, the first semiconductor switch is in particular an electrical or electronic component which realizes the function of a switch in the form of a semiconductor component. Suitably, the electrical current strength for which the bus bars are designed is the same electric current for which the first semiconductor switch is designed, or at least an integer multiple thereof.

The first transmission terminal of the first semiconductor switch is electrically contacted directly with the first bus bar, and the second transmission terminal of the first semiconductor switch is electrically contacted directly with the second bus bar. In other words, the first semiconductor switch is connected in series with the first busbar and the second busbar, and the first busbar is electrically contacted to the second busbar by means of the first semiconductor switch. In this case, direct electrical contacting means in particular that the respective components lie substantially directly against one another, and that no further electrically conductive components are present between these components, regardless of their respective electrical resistance. For this purpose, the components are soldered or welded, for example. In particular, the first transmission connection to the first busbar and the second transmission connection to the second busbar are welded or the respective components are soldered to one another. Suitably, the first semiconductor ter arranged spatially between the two busbars, so that the high-current switch is constructed substantially in layers. In summary, by means of applying an electrical voltage to the control terminal of the first semiconductor, a current flow from the first busbar to the second busbar can be set, thus enabling or inhibiting a current flow. Consequently, by means of the high-current switch, an electric current can be switched. The electric current in this case has an electrical voltage of in particular more than 10 V and is for example equal to 12 V, 24 V, 48 V and expediently less than 60 V. The electrical current is preferably more than 10 A, 25 A, 50 A, 75 A. , 100 A, 125 A, 175 A, 250 A, 300 A, 400 A or 500 A.

The high-current switch is preferably part of a motor vehicle, in particular a commercial vehicle, such as a truck, a bus or a construction vehicle. Alternatively, the motor vehicle is an aircraft, a boat, a yacht, a ship or a forklift vehicle, such as an aircraft. a forklift. In other words, the high current switch is used to switch a circuit of such a vehicle. In particular, the high-current switch is used for the controlled operation of a starter, or other ancillary equipment such. B. an air conditioner. Alternatively, the high current switch is used to operate a main drive or as the main switch of a battery.

Due to the first semiconductor switch no mechanically moving parts are required for the operation of the high-current switch, which could, for example, snag or merge with each other, or lose their function due to a mechanical overload, for example due to vibration. Because of the direct electrical contacting of the first semiconductor switch with the busbars no circuit board is required, the current carrying capacity of the current corresponds to the means of the high-current switch electrical current. In particular, the high-current switch has no printed circuit board in thick copper technology. In other words, the high current switch is thick copper intermediate layerless. In particular, the first, preferably also the second busbar is independent of any printed circuit board present. In this way, the cross section of the respective busbar can be chosen comparatively large, which leads to a comparatively low heating of the components carrying the electrical current during operation of the high-current switch. Consequently, no active cooling of the high-current switch is required, which reduces both the manufacturing costs and the operating costs. Conveniently, the high-current switch is free from active cooling. For example, passive cooling elements are connected to the first semiconductor switch and this is thermally coupled to the passive cooling element.

Suitably, the high current switch has at least one further semiconductor switch which is connected in parallel to the first semiconductor. In other words, the further semiconductor switch is also electrically contacted with the first and the second busbar. In particular, the further semiconductor switch likewise has a first and a second transmission connection and a control connection, wherein the first transmission connection of the further semiconductor switch is suitably electrically contacted directly to the first busbar and the second transmission connection is suitably directly connected to the second busbar. Advantageously, the transmission connections are soldered to the respective busbar. In particular, the control terminal of the further semiconductor switch is electrically connected to the control terminal of the first semiconductor switch, and in particular the two control terminals are short-circuited. In this way, when an electrical voltage is applied to the control terminal of the first semiconductor switch, both semiconductor switches of the high-current switch are always in the conducting state or in the non-conducting state. In particular, the further semiconductor switch is identical in construction to the first semiconductor switch, which reduces the storage in the production and favors the power distribution.

Due to the parallel connection, the current conducted by means of the first semiconductor switch is reduced so that the first semiconductor switch can be made smaller. In this way, the manufacturing costs and the size of the High current switch reduced. Suitably, the high current switch comprises a number of further semiconductor switches, each connected in parallel with each other and parallel to the first semiconductor switch. In particular, the number of further semiconductor switches is between four and nine, so that the number of semiconductor switches of the high-current switch is between five and ten. Preferably, all further semiconductor switches, which are connected in parallel to the first semiconductor switch, are also electrically contacted directly to the respective busbar.

For example, the busbar is a stamped and bent part, which is cuboid-shaped or at least has a cuboid-shaped section, which is referred to below as a supporting body. The busbar is expediently configured in one piece, so that further components, if they are present, are integrally formed on the respective carrier body. In particular, the first semiconductor is electrically directly contacted with the parallelepiped-shaped supporting body in this case or a contact point formed on it, and preferably in direct mechanical contact therewith. The cuboid shape in this case has, in particular, a width and a height which is in each case greater than 1 mm, and expediently the length of the busbar is greater than 10 mm, wherein, during operation of the high-current switch, the electric current flows in particular in the longitudinal direction, that is to say in one direction. which is parallel to the linear expansion. Suitably, the length is less than 20 cm, 15 cm, 10 cm, 5 cm and / or the width and / or the height is less than 20 mm, 15 mm, 10 mm, 5 mm. Expediently, the cross section of the busbar or of the carrier body perpendicular to the flow direction of the electrical current is greater than 1 mm ² , 2 mm ² , 5 mm ² , 10 mm ² , 100 mm ² or 200 mm ² and, for example, less than 3000 mm ² , 2000 mm ² or 1000 mm ² . In this way, on the one hand, a comparatively high current-carrying capacity and, on the other hand, comparatively compact dimensions of the high-current switch are realized.

In particular, the busbars are made of copper, a copper alloy or aluminum. Suitably, the busbars are nickel plated, tinned or silver plated. For example, the first semiconductor is at the free end of each Busbar contacted with these. If a further semiconductor is present, the respective contact points are hereby spaced from this free end and preferably likewise from the remaining free end.

For example, the cross section of the busbars between the two contact points, ie between the contact point of the first transmission terminal of the further semiconductor switch and the contact point of the first transmission terminal of the first semiconductor switch and between the corresponding contact points of the second busbar, compared to other areas of the respective busbar reduced. In particular, further semiconductor switches are present and each bus bar has at one of the ends a connection for a cable or a cable lug, wherein the cross section of the bus bars is reduced with increasing distance to the terminal. For example, each busbar is configured in a substantially staircase shape, wherein the contact point with one of the semiconductor switches is located at each stage. Alternatively, the busbars are configured substantially triangular, with one of the apex of the triangular shape has the greatest distance from the terminal. Due to the tapered cross-section less material for the production of the bus bar is present, resulting in a weight and cost savings. Because of the parallel connection of the semiconductor switches, in this case the current intensity is reduced in the region of the reduced cross section, so that even with a reduced cross section no increased heating of the high current switch occurs during operation.

In an alternative embodiment of the invention, each busbar is formed by means of a plate-shaped stamped bent part, which is designed, for example, circular. The two plate-shaped stamped and bent parts are arranged parallel to one another and are preferably spaced apart from one another in such a way that the projections of the stamped and bent parts overlap one another on a plane parallel to these. The thickness of the plates, that is to say the direction of expansion perpendicular to the arrangement direction, is in particular greater than 1 mm, 2 mm, 5 mm and expediently less than 10 cm, 5 cm or 2 cm. Between the two stamped and bent parts of the first semiconductor switch is arranged. Especially the first semiconductor switch is located locally between the two stamped and bent parts. Preferably, there is at least one further semiconductor switch and suitably a number of semiconductor switches which are also positioned between the two plates. In particular, the plates are circular and the semiconductor switches concentric with these, preferably arranged in a star shape. Preferably, a connection is formed on the plates on the side facing the first semiconductor switch, for example in the form of a cylinder. In particular, the cylinder has a number of grooves or clamps for attaching an electrical cable. For example, an external thread is introduced into the lateral surface of the cylinder. In this way, a comparatively compact and robust high-current switch is realized, wherein the or the semiconductor switch is protected by the busbar against any damage.

In a suitable embodiment of the invention, the first semiconductor switch and the one or more other semiconductor switches, if they are present, attached to the first busbar. Conveniently, the first semiconductor switch is also attached to the second busbar. If further semiconductor switches are present, they are also fastened in particular to the second busbar. The following statements with respect to the semiconductor switch or with respect to the first busbar are also realized in a preferred embodiment of the invention with respect to the second busbar.

In particular, the first semiconductor switch is arranged between the first and the second busbar, so that the composite of the first busbar, the first semiconductor and the second busbar is stacked like a stack. In this way, the first semiconductor is secured comparatively secure against detachment from the busbars. Alternatively, the first semiconductor as well as any further semiconductors are fastened to the busbars like a sill. This allows a comparatively simple replacement in case of damage to the semiconductor or semiconductors. Due to the attachment of the first semiconductor to at least the first busbars, no further components are required for determining the position of the first semiconductor and fixing it with respect to the first busbar, which leads to reduced manufacturing costs. Especially the attachment to the first busbar is effected by means of the electrical contact, so that no further work step is required, which shortens the production time. In addition, because of the attachment to the first busbar, the electrical contacting of the first semiconductor with the first busbar is comparatively less loaded, since no relative movement can occur due to different attachment points between the two components. Furthermore, a comparatively compact high-current switch is realized in this way. Conveniently, the attachment by means of soldering or welding.

In an alternative embodiment of the invention, the control terminal is attached to a circuit board, which is preferably carried out self-supporting.

Expediently, the printed circuit board has a conductor track which is contacted directly electrically with the control terminal of the first semiconductor. In this way, a control of the first semiconductor switch is facilitated. In particular, the circuit board is equipped in a first step with electrical and / or electronic components, for example in SMD technology. In this case also the first semiconductor switch is connected to the circuit board. In a further step, the first semiconductor switch is electrically contacted directly with the first and the second busbar. In this way, it is possible to manufacture the circuit board independently of the bus bars, which shortens the production time. In addition, an independent review of the first semiconductor switch and its control electronics is possible.

Preferably, the first bus bar has a contact point which is in direct mechanical contact with the first transfer terminal of the first semiconductor. In particular, the first transmission connection is soldered or welded to the contact point. In this way, the position of the electrical contact between the first semiconductor and the busbar is stabilized, so that even with a vibration of the high-current switch, the electrical contact is not canceled. For example, the first recess is larger than the contact point, so that a tolerance compensation is created between them. Preferably, the contact point is aligned with the printed circuit board, so that a substantially lent flat surface is created. In particular, the first semiconductor switch is positioned along this surface, which facilitates assembly.

Suitably, the first busbar is substantially over the entire surface of the circuit board, which leads to a comparatively stable position of the first busbar. Alternatively, the first bus bar on the support body, which is spaced from the circuit board. In particular, the support body comprises a connection or a connection point for an electrical cable or a conduit. For example, this point is designed as an opening for fastening a cable lug by means of a threaded bolt. Due to the fact that it is possible to manufacture the printed circuit board comparatively compactly. In addition, it is possible to essentially equip the space provided completely by the printed circuit board with electrical and / or electronic components, since an influence due to the electric current conducted by means of the busbar is substantially precluded. For example, the contact point is integrally formed on the support body, if it is present. The contact point is designed for example L-shaped, wherein one of the legs rests against the circuit board. With the contact point of the first semiconductor switch is preferably contacted directly electrically. In this way, the electrical contact point is comparatively close to the circuit board and thus comparatively well protected.

Conveniently, the first busbar, and more preferably also the second busbar, attached to the circuit board. Consequently, the position of the first busbar with respect to the first semiconductor switch is stabilized by means of the printed circuit board, so that the electrical contact between the first transmission terminal and the first busbar is comparatively slightly loaded during operation of the high-current switch and any possible vibration. For example, the first busbar is soldered to the circuit board or bolted to it. Alternatively, the busbar on pin-like projections or in particular resiliently configured pins, which are positively and / or positively positioned in corresponding openings of the circuit board. For mounting, therefore, the bus bar on the surface of the printed circuit board positive. oniert and pressed in a further step against this until the extensions or pins are inserted to a desired level in the respective openings. Particularly preferably, the extensions are created by means of beads.

For example, the first bus bar is positioned on the same side of the circuit board as the first semiconductor. In this way, by means of the remaining side of the printed circuit board, a bearing surface is provided for fastening the printed circuit board, for example within a housing. Also, an assembly of the first busbar and the first semiconductor switch is simplified and also a height comparatively low. Alternatively, the printed circuit board is positioned substantially between the first semiconductor switch and the first bus bar. In this way, an influence on any conductive strip contacted with the control connection, which is located in particular on the side of the first semiconductor switch, is substantially excluded. By way of example, the second busbar is positioned on the side of the printed circuit board on which the first busbar is likewise located. Consequently, the attachment of the first and the second busbar substantially in one step allows. Alternatively, the printed circuit board is arranged between the first busbar and the second busbar. In this way, a short circuit or an electrical flashover between the first and the second busbar is prevented by means of the printed circuit board.

In an advantageous embodiment of the invention, the structure of the second busbar is substantially equal to the first busbar. In other words, the second busbar also or alternatively includes the contact point, which is arranged in a recess of the circuit board, and / or the second busbar is secured by means of beads on the circuit board.

For example, the control terminal is electrically contacted with a conductor track of a printed circuit board, to which the first semiconductor switch is attached. Alternatively, the printed circuit board is simply plugged onto the first semiconductor switch or the printed conductor is part of a foil cable, which essentially fulfills no supporting function. In particular, such a foil cable or a such printed circuit board is arranged substantially rotated to a bDene inside which lie the first and the second busbar. In an alternative embodiment of the invention, the control terminal of the first semiconductor switch with a cable, a wire or an electrical line is contacted directly electrically. Advantageously, the line is soldered to the control terminal of the first semiconductor switch. If further semiconductor switches are present, their respective control connection is expediently also electrically contacted with the same line. As a result, no circuit board is required to create the high-current switch, which reduces costs. Also, an exchange of the first semiconductor switch is comparatively easy, and also the space requirement of the high-current switch is reduced.

Embodiments of the invention will be explained in more detail with reference to a drawing. Show:

1 is a perspective view of a first embodiment of a high-current switch with cuboid busbars,

2 perspectively another embodiment of the high-current switch, FIG. 3 in perspective a third embodiment of the high-current switch, FIG. 4 shows in perspective another embodiment of the high-current switch with cylindrical busbars,

5 is a perspective view of a printed circuit board,

6 is a plan view of a first semiconductor switch, which is contacted with a further embodiment of the first busbar,

Fig. 7 in perspective, the first busbar according to FIG. 6 and a second

Busbar

Fig. 8 in perspective another embodiment of the high-current switch with the busbars of FIG. 7, and

9 is a perspective view of another embodiment of the high-current switch with the busbars according to FIG. 7.

Corresponding parts are provided in all figures with the same reference numerals. In Fig. 1, a first embodiment of a high-current switch 2 is shown in perspective. The high current switch 2 has a first bus bar 4 and a second bus bar 6, which are similar. In other words, the first busbar 4 and the second busbar 6 do not differ. The first busbar 4 consists of a cuboid stamped bent part of a tinned copper. The height 8, ie the thickness of the first busbar 4 is 3 mm, the width 10 is at least 3 mm and the length 12, ie the extension of the first busbar 4 along a longitudinal direction 14, is 50 mm. The first busbar 4 and the second busbar 6 are arranged parallel to the longitudinal direction 14 and in the direction of the width 10 spaced from each other.

The high-current switch 2 furthermore has a first semiconductor switch 16 and a further semiconductor switch 18 which are each designed as a MOSFET and are likewise similar. Thus, each semiconductor switch 16, 18 has a first transfer port 20 and a second transfer port 22, which are each designed cap or pot-like. In between, a center piece 24 made of a semiconductor material is arranged in each case. The center piece 24 further has a control terminal 26, by means of which the electrical conductivity of the respective semiconductor switch 16, 18 can be adjusted.

At each of the control terminals 26, an electrical line 28 is soldered, so contacted electrically directly to the control terminal 26. The electrical line 28 is electrically connected to an electronic not shown here and is applied during operation of the high-current switch 2 with a control signal which is an electrical voltage. Each first transmission terminal 20 of the two semiconductor switches 16, 18 is soldered to the first bus bar 4, wherein the two semiconductor switches 16, 18 are spaced apart in the longitudinal direction 14. Along the width 10 of the busbars 4, the first transmission terminals 20 are located on the entire surface of the first busbar 4. In the same way, the second transmission terminals 22 are attached to the second bus bar 6 and thus electrically contacted with this. In consequence of the arrangement the two semiconductor switches 16, 18 are connected in parallel to each other. The first semiconductor switch 16 is located at the free end of the first and the second busbar 4, 6, that is, in an end region in the longitudinal direction 14 of the two busbars 4, 6.

The high-current switch 2 is part of a vehicle electrical system of a motor vehicle, by means of the high-current switch 2, an air conditioner on or off. When operating the high-current switch 2, an electrical voltage of 24 V is applied between the first busbar 4 and the second busbar 6. If no electrical voltage supplied by the electronics, not shown, is applied to the electrical line 28, both the first semiconductor switch 16 and the further semiconductor switch 18 are in a non-conductive state. In other words, no electric current flows from the first bus bar 4 to the second bus bar 6. As soon as the electrical line 28 is acted upon by the electronics with an electrical voltage, both the first semiconductor switch 16 and the further semiconductor switch 18 are brought into the conductive state. As a result, an electric current having a current of 280 A flows from the first bus bar 4 via the semiconductor switches 16, 18 to the second bus bar 6 and the air conditioning system of the commercial vehicle is in operation. Due to the parallel connection of the two semiconductor switches 16, 18 in this case flows through each of the semiconductor switches 16, 18 only a current with a current of substantially 140 A.

2, a further embodiment of the high-current switch 2 is shown, wherein the two busbars 4, 6 correspond to those shown in the previous example. The semiconductor switches 16, 18 and their attachment and electrical contact with the two busbars 4, 6 corresponds to those of the previous embodiment. Only the control terminal 26 is modified. Instead of being substantially punctiform, the control terminal 26 is an L-shaped bent conductor. In this case, the control terminal 26 of the first semiconductor switch 16 is electrically contacted to a first interconnect 30 and the control terminal 26 of the further semiconductor switch 18 to a second interconnect 32 of a printed circuit board 34. The first conductor 30 is opposite the second conductor 32 electrically isolated, so that the two semiconductor switches 16, 18 can be controlled independently. In other words, it is possible to convert either the first semiconductor switch 16 or the second semiconductor switch 18 or both semiconductor switches 16, 18 into a conductive state or into a non-conductive state. The printed circuit board 34 is arranged at a distance from the two busbars 4, 6, wherein the second busbar 6 is located between the printed circuit board 34 and the first busbar 4. Also, the orientation of the circuit board 34 is perpendicular to the plane within which the two bus bars 4, 6 are arranged. In this way, a comparatively simple inspection of the individual components of the high-current switch 2 is made possible.

In Fig. 3, a further embodiment of the high-current switch 2 is also shown in perspective. The design of the two busbars 4, 6 as a stamped and bent part and their dimensions corresponds to the already known. Only the material from which the two busbars 4, 6 are made, is modified to aluminum. Further, the positioning of the two mutually parallel to each other in the longitudinal direction 14 busbars 4, 6 is changed. The second busbar 6 is offset relative to the first busbar 4 in a first direction 36 parallel to the height 8. In the first direction 36 between the first busbar 4 and the second busbar 6, the first semiconductor switch 16 and two further semiconductor switch 18 is positioned, wherein the respective pot-like transmission terminals 20, 22 with the respective bottom of the pot on the associated busbar 4, 6 abut the entire surface. In a direction perpendicular to the first direction 36 and perpendicular to the longitudinal direction 14, the semiconductor switches 16, 18 are flush with the two busbars 4, 6 and are welded to the respective busbars 4, 6. With the exception of the design of the control terminals 26, the semiconductor switches 16, 18 correspond to those shown in FIG. Namely, the control terminals 26 are not L-shaped but realized only by means of an unbent wire to which the electric wire 28 is soldered. Due to the use of three semiconductor switches 16, 18, the electrical current flowing through each of the semiconductor switches 16, 18 is reduced to a current of less than 100 A, which increases the life the semiconductor switch 16, 18 increases and reduces the thermal load and the heating of the environment of the high-current switch 2.

4, another embodiment of the high-current switch 2 is shown. The high-current switch 2 has the first semiconductor switch 16 and two further semiconductor switches 18 which, with the exception of the design of the control terminal 26, correspond to the semiconductor switches 16, 18 shown in FIG. The control terminals 26 and the contact with the electrical line 28 correspond to the embodiments shown in FIG. 1. The first busbar 4 and the second busbar 6 are each plate-like executed as a round disc and made by punching a sheet. The thickness 38 of the two similar busbars 4, 6 is 2 mm. The two busbars 4, 6 are arranged parallel to one another, wherein the semiconductor switches 16, 18 are positioned between the busbars 4, 6. In the direction perpendicular to the plane of arrangement of the two busbars 4, 6 cover the two busbars 4, 6 and are spaced from each other. Within the interspace formed in this way, the semiconductor switches 16, 18 are positioned and soldered to their respective transmission terminals 20, 22 on the two bus bars 4, 6.

Here, the semiconductor switches 16, 18 are arranged in a star shape and rotationally symmetrical with respect to a straight line defined by the two centers of the circular busbars 4, 6. On the semiconductor switches 16, 18 respectively opposite side of the two bus bars 4, 6, a cylindrical connection 40 is formed concentrically with the respective busbar 4, 6. Each terminal 40 has an unillustrated external thread for attachment. The connections 40 consist of the material of the busbars 4, 6, so that an electric current can flow via one of the connections 40 to the first busbar 4, from there via the parallel-connected semiconductor switches 16, 18 to the second busbar 6, and the remaining connection 40 if the semiconductor switches 16, 18 are suitably controlled via the control terminals 26. FIG. 5 shows a printed circuit board 42 of a further embodiment of the high-current switch 2, with eight square second recesses 44, eight rectangular first recesses 46 and a number of round openings 48. By means of the openings 48 a rectangular shape is formed, within which the mutually parallel second recesses 44 and first recesses 46 are arranged. The recesses 44, 46 extend through the printed circuit board 42.

6, the first semiconductor switch 16 and the first bus bar 4 is shown in a plan view in a plan view. The first busbar 4 in this case has eight cuboid contact points 50, which are integrally formed on a support body 52 (FIG. 7). At one of the contact points 50, the first transmission terminal 20 of the first semiconductor switch 16 is soldered in the form of five pins. The control terminal 26, which is likewise formed by means of a pin, is electrically contacted to a conductor track of the printed circuit board 42 in the assembled state (FIG. 8). The second transmission terminal 22 of the first semiconductor switch 16 is created by means of a square connection plate whose dimension is smaller than that of the second recess 44 of the circuit board 42.

FIG. 7 shows the first busbar 4 and the second busbar 6 in accordance with their mounting position of the high-current switch 2 shown in FIG. Each of the busbars 4, 6 comprises the support body 52, which extends in the longitudinal direction 14. In this case, eight parallelepiped contact points 50 are integrally formed on the support body 52 of the first busbar 4, whose respective dimensions correspond to those of the first recess 46. To the support body 52 of the second bus bar 6 eight contact points 50 are also formed, which are designed to be larger compared to those of the first bus bar 4. The dimensions of the contact points 50 of the second bus bar 6 are smaller than those of the second recesses 44. Further, each extension 52 is formed with seven extensions 54 thickened free end, which are directed away from the other busbar 4, 6 away. At each of the extensions 54 is a bead 56th In Fig. 8, the high-current switch 2 is shown with the components shown in Fig. 5-7. The high current switch 2 comprises the first semiconductor switch 16 and seven further semiconductor switches 18, which are identical in construction to the first semiconductor switch 16. Each semiconductor switch 16, 18 abuts the printed circuit board 42 and is attached thereto. Within the second recesses 44, the contact points 50 of the second bus bar 6 are positioned and soldered to the respective second transmission terminal 22. Within the first recesses 46 are the contact points 50 of the first bus bar 4, to which each of the first transmission terminal 20 of the semiconductor switches 16, 18 is soldered.

The printed circuit board 42 is located between the semiconductor switches 16, 18 and the support members 52 of the two busbars 4, 6, which rest against the entire surface of the circuit board. Within the openings 48, the beads 56 of the busbars 4, 6 are arranged non-positively and positively, so that the busbars 4, 6 are fixed to the circuit board 42. Each support body 52 has at one of the free ends a round opening 58, within which in each case a threaded bolt for mounting a cable lug is partially arranged in the assembled state. In this case, the two openings 58 are located at opposite ends in the longitudinal direction of the high-current switch. 2

In Fig. 9, a further embodiment of the high-current switch 2 is shown in perspective, which corresponds with the exception of the design of the first busbar 4 of the embodiment shown in Fig. 8. Also, this first busbar 4 includes the support body 52 which bears against the printed circuit board 42. However, the circuit board 42 is located between the first bus bar 4 and the second bus bar 6, so that the support body 52 is positioned on the side of the semiconductor switches 16, 18. To the support body 52, the extensions 54 are also integrally formed with the beads 56, which protrude into the corresponding opening 48.

The invention is not limited to the embodiments described above. Rather, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, all are also related to the individual Embodiments described individual features combined with each other in another way without departing from the subject matter of the invention.

LIST OF REFERENCE NUMBERS

2 high current switches

4 first busbar

6 second busbar

8 height

10 width

12 length

14 longitudinal direction

16 first semiconductor switch

18 more semiconductor switches

20 first transmission connection

22 second transmission port

24 center piece

26 control connection

28 cables

30 first trace

32 second trace

34 circuit board

36 first direction

38 thickness

40 connection

42 circuit board

44 second recess

46 first recess

48 opening

50 contact points

52 supporting body

54 extension

56 beading

58 opening

Claims

P140123P RF / SES

02. April 2015

claims

1. High-current switch (2), in particular of a motor vehicle, with a first busbar (4) and with a second busbar (6) and with a first semiconductor switch (16) having a control terminal (26) and a first transmission terminal (20) as well a second transmission terminal (22), wherein the first transmission terminal (20) directly to the first busbar (4) and the second transmission terminal (22) is electrically contacted directly to the second busbar (6).

2. high current switch (2) according to claim 1,

marked by

at least one further semiconductor switch (18) which is connected in parallel with the first semiconductor switch (16).

3. high-current switch (2) according to claim 1 or 2,

characterized,

in that each busbar (4, 6) is formed by means of a cuboid stamped bent part whose width (10) is greater than 1 mm, whose height (8) is greater than 1 mm and whose length (12) is greater than 10 mm.

4. high-current switch (2) according to claim 1 or 2,

characterized,

in that each busbar (4, 6) is formed by means of a plate-shaped stamped and bent part which are arranged parallel to one another, wherein the first semiconductor switch (16) is arranged between the two stamped and bent parts.

5. high current switch (2) according to one of claims 1 to 4, aaauren,

in that the first semiconductor switch (16) is fastened to the first busbar (4), and in particular to the second busbar (6).

6. high-current switch (2) according to one of claims 1 to 4,

characterized,

the first control connection (26) is fastened to and electrically contacted with a printed circuit board (42).

7. high current switch (2) according to claim 6,

characterized,

in that the first bus bar (4) has a contact point (50) with which the first transfer terminal (20) is in direct mechanical contact and which is arranged in a first recess (46) of the circuit board (42).

8. high current switch (2) according to claim 7,

characterized,

the contact point (50) is flush with the printed circuit board (42).

9. high current switch (2) according to any one of claims 6 to 8,

characterized,

in that the first busbar (4), and in particular the second busbar (6), is fastened to the printed circuit board (42), in particular by means of beads (56).

10. high-current switch (2) according to one of claims 1 to 9,

characterized,

in that the control connection (26) is in direct electrical contact with a line (28).