HIGH CURRENT SWITCH

Abstract

A high current switch, in particular for a motor vehicle, having a first bus bar, a second bus bar in addition to a first semi-conductor switch that has a control connection and a first transmission connection as well as a second transmission connection. The first transmission connection is placed in direct contact with the first bus bar and the second transmission connection is placed in direct electric contact with the second bus bar.

Claims

1. A high current switch of a motor vehicle, comprising: a first bus bar; a second bus bar; and a first semiconductor switch with a control connection and a first transmission connection and a second transmission connection, the first transmission connection being directly electrically contacted with the first bus bar and the second transmission connection being directly electrically contacted with the second bus bar.

2. The high current switch according to claim 1, further comprising a second semiconductor switch that is connected in parallel to the first semiconductor switch.

3. The high current switch according to claim 1, wherein each bus bar is formed by a cuboid stamped and bent part that has a width greater than 1 mm, a height greater than 1 mm and a length greater than 10 mm.

4. The high current switch according to claim 1, wherein, each bus bar is formed by a plate-shaped stamped and bent part, which are arranged parallel to each other, and wherein the first semiconductor switch is arranged between the two stamped and bent parts.

5. The high current switch according to claim 1, wherein the first semiconductor switch is attached to the first bus bar and to the second bus bar.

6. The high current switch according to claim 1, wherein the first control connection is fixed to a printed circuit board and electrically contacted therewith.

7. The high current switch according to claim 6, wherein the first bus bar has a contact point with which the first transmission connection is in direct mechanical contact and which is arranged in a first recess of the printed circuit board.

8. The high current switch according to claim 7, wherein the contact point is flush with the circuit board.

9. The high current switch according to claim 6, wherein the first bus bar and the second bus bar is fixed on the printed circuit board via beads.

10. The high current switch according to claim 1, wherein the control connection is directly electrically contacted with an electrical line.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:

[0034] FIG. 1 in perspective, illustrates an embodiment of a high current switch, having cuboid bus bars,

[0035] FIG. 2 in perspective, illustrates an embodiment of the high current switch,

[0036] FIG. 3 in perspective, illustrates an embodiment of the high current switch,

[0037] FIG. 4 in perspective, illustrates an embodiment of the high current switch, having cylindrical bus bars,

[0038] FIG. 5 in perspective, illustrates a printed circuit board,

[0039] FIG. 6 in a plan view, illustrates a first semiconductor switch which is contacted with an embodiment of the first bus bar,

[0040] FIG. 7 in perspective, illustrates the first bus bar as shown in FIG. 6, and a second bus bar,

[0041] FIG. 8 in perspective, illustrates an embodiment of the high current switch with the bus bars according to FIG. 7, and

[0042] FIG. 9 in perspective, illustrates an embodiment of the high current switch with the bus bars according to FIG. 7.

DETAILED DESCRIPTION

[0043] FIG. 1 shows a first embodiment of a high current switch 2 in perspective. The high current switch 2 has a first bus bar 4 and a second bus bar 6, which are identical. In other words, the first bus bar 4 and the second bus bar 6 do not differ. The first bus bar 4 has a cuboid stamped and bent part of a tinned copper. The height 8, that is, the thickness of the first bus bar 4, is 3 mm, the width 10 is at least 3 mm, and the length 12, that is, the expansion of the first bus bar 4 along a longitudinal direction 14, is 50 mm. The first bus bar 4 and the second bus bar 6 are parallel to the longitudinal direction 14 and disposed spaced from one another in the direction of the width 10.

[0044] The high current switch 2 furthermore comprises a first semiconductor switch 16 and another semiconductor switch 18, which are each designed as a MOSFET and also identical. Thus, each semiconductor switch 16, 18 has a first transmission connection 20 and a second transmission connection 22 which are each designed cap or cup-like. In between, a center piece 24 made of a semiconductor material is arranged, respectively. The center piece 24 also has a control connection 26, by means of which the electrical conductivity of each semiconductor switch 16, 18 can be adjusted.

[0045] At each of the control connections 26, an electrical line 28 is soldered, thus, directly electrically contacted to the control connection 26. The electrical line 28 is electrically connected to an electronics, not illustrated, and is acted upon during operation of the high current switch 2 with a control signal that is an electric voltage. Each first transmission connection 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 from each other in the longitudinal direction 14. Along the width 10 of the bus bars 4, the first transmission connections 20 make full contact over the entire surface of the first bus bar 4. In the same manner, the second transmission connections 22 are attached to the second bus bar 6 and thus electrically contacted therewith. As a consequence of the arrangement, the two semiconductor switches 16, 18 are connected in parallel. The first semiconductor switch 16 is disposed at the free end of the first and the second bus bar 4, 6, that is, in an end portion in the longitudinal direction 14 of the two bus bars 4, 6.

[0046] The high current switch 2 is part of a vehicle electrical system of a motor vehicle, wherein by means of the high current switch 2, an air conditioning system is turned on or off. During operation of the high current switch 2, an electric voltage of 24 V is applied between the first bus bar 4 and the second bus bar 6. Provided that no electric voltage is applied at the electric line 28 by the not-shown electronics, 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. When the electric line 28 is acted upon with an electrical voltage by means of the electronics, both the first semiconductor switch 16 and the further semiconductor switch 18 are transferred to the conductive state. As a result, an electric current with a current of 280 A flows from the first bus bar 4 through the semiconductor switch 16, 18 to the second bus bar 6, and the air conditioning system of the utility vehicle is in operation. Due to the parallel connection of the two semiconductor switches 16, 18, in this case, only a current with a current strength of substantially 140 A flows through each of the semiconductor switches 16, 18.

[0047] FIG. 2 illustrates a further embodiment of the high current switch 2, wherein the two bus bars 4, 6 correspond to those shown in the previous example. The semiconductor switches 16, 18 and their attachment and electrical contact with the two bus bars 4, 6 also correspond to those of the preceding embodiment. Only the control connection 26 is modified. Instead of running essentially at points, the control connection 26 is an L-shaped bent conductor. Here, the control connection 26 of the first semiconductor switch 16 is electrically contacted with a first conductive trace 30 and the control connection 26 of the further semiconductor switch 18 with a second conductive trace 32 of a printed circuit board 34. The first conductive trace 30 is electrically isolated from the second conductive trace 32 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 or a non-conductive state. The circuit board 34 is arranged at a distance to the two bus bars 4, 6, wherein the second bus bar 6 is located between the circuit board 34 and the first bus bar 4. Also, the orientation of the printed circuit board 34 is perpendicular to the plane within which the two bus bars 4, 6 are arranged. In this way, a relatively simple inspection of the individual components of the high current switch 2 is possible.

[0048] FIG. 3 also shows a further embodiment of the high current switch 2 in perspective. The configuration of the two bus bars 4, 6 as a stamped and bent part and their dimensions correspond to the ones already known. Only the material of which the two bus bars 4, 6 are made is modified to aluminum. Further, the positioning of the two bus bars 4, 6, parallel-aligned to one another in the longitudinal direction 14, is modified. The second bus bar 6 is offset parallel to the height 8 with respect to the first bus bar 4 in a first direction 36. In the first direction 36 between the first bus bar 4 and the second bus bar 6, the first semiconductor switch 16 and two other semiconductor switches 18 are positioned, wherein their respective cup-shaped transmission connections 20, 22 make contact with the entire surface of the respective pot base on the associated bus bar 4, 6. 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 bus bars 4, and are welded to the respective bus bars 4, 6. With the exception of the design of the control connections 26, the semiconductor switches 16, 18 correspond to those shown in FIG. 2. The control connections 26 are in fact not formed L-shaped, but only realized by means of an unbent wire to which the electric line 28 is soldered. Due to the use of three semiconductor switches 16, 18, the electric current flowing through each of the semiconductor switches 16, 18 is reduced to a current of less than 100 A, which increases the service life of the semiconductor switches 16, 18 and reduces the thermal load as well as the heating of the environment of the high current switch 2.

[0049] FIG. 4 shows a further embodiment of the high current switch 2. The high current switch 2 includes the first semiconductor switch 16 as well as two further semiconductor switches 18, which with the exception of the configuration of the control connection 26, correspond to the semiconductor switches 16, 18 shown in FIG. 3. The control connections 26 and the contact with the electric line 28 correspond to the embodiments shown in FIG. 1. The first bus bar 4 and the second bus bar 6 are in each case designed plate-like as a round disk and are produced by stamping from a sheet. The thickness 38 of the two identical bus bars 4, 6 is 2 mm. The two bus bars 4, 6 are arranged parallel to one another, wherein the semiconductor switches 16, 18 are positioned between the bus bars 4, 6. In the direction perpendicular to the plane of arrangement of the two bus bars 4, 6, the two bus bars 4, 6 overlap and are spaced apart from each other. Within the gap formed in this way, the semiconductor switches 16, 18 are positioned and are soldered with their respective transmission connections 20, 22 at the two bus bars 4, 6.

[0050] Here, the semiconductor switches 16, 18 are arranged star-shaped and rotationally symmetrical with respect to a straight line defined by the two center points of the circular bus bars 4, 6. On the side of the two bus bars 4, 6 disposed opposite the semiconductor switches 16, 18, a cylindrical connection 40 is concentrically formed to the respective bus bar 4, 6. Each connection 40 has a not-shown external thread for fastening. The connections 40 are made of the material of the bus bars 4, 6, so that an electric current can flow via one of the connections 40 to the first bus bar 4, from there via the parallel-connected semiconductor switches 16, 18 to the second bus bar 6, and then to the remaining connection 40, provided that the semiconductor switches 16, 18 are suitably controlled via the control connections 26.

[0051] FIG. 5 illustrates a circuit board 42 in a further embodiment of the high current switch 2, with eight square-shaped second recesses 44, eight square-shaped first recesses 46, and a number of circular openings 48. By means of the openings 48, a rectangular shape is formed, within which the parallel-arranged second recesses 44 and the first recesses 46 are arranged. The recesses 44, 46 extend through the circuit board 42.

[0052] FIG. 6 shows the first semiconductor switch 16 and in part, the first bus bar 4 in a plan view. The first bus bar 4 in this case has eight rectangular contact points 50 which are integrally formed on a supporting body 52 (FIG. 7). At one of the contact points 50, the first transmission connection 20 of the first semiconductor switch 16 is soldered in the form of five pins. The control connection 26 also formed by means of a pin is electrically contacted with a conductive trace of the printed circuit board 42 in the assembled state (FIG. 8). The second transmission connection 22 of the first semiconductor switch 16 is created by means of a square connection plate, which dimensions are smaller than those of the second recess 44 of the circuit board 42.

[0053] FIG. 7 shows the first bus bar 4 as well as the second bus bar 6 as they correspond to the mounting position of the high current switch 2 shown in FIG. 8. Each of the bus bars 4, 6 includes the supporting body 52, which extends in the longitudinal direction 14. Here, eight cuboid contact points 50 are integrally formed on the supporting body 52 of the first bus bar 4, which respective dimensions correspond to the first recess 46. On the supporting body 52 of the second bus bar 6, eight contact points 50 are also formed, these being designed 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, seven extensions 54 are integrally formed with a thickened free end on each supporting body 52, which are directed away from the respective, other bus bar 4, 6. At each of the extensions 54, there is a bead 56.

[0054] FIG. 8 shows the high current switch 2 with the components shown in FIGS. 5-7. The high current switch 2 includes the first semiconductor switch 16 and seven other semiconductor switches 18, which are identical to the first semiconductor switches 16. Each semiconductor switch 16, 18 is applied to the printed circuit board 42 and is fixed 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 connection 22. Within the first recesses 46, the contact points 50 of the first bus bar 4 are disposed, at each of which the first transmission connection 20 of the semiconductor switches 16, 18 is soldered.

[0055] The circuit board 42 is located between the semiconductor switches 16, 18 and the supporting bodies 52 of the two bus bars 4, 6, which bear against the entire surface of the printed circuit board. Within the openings 48, the beads 56 of the bus bars 4, 6 are arranged non-positively and positively, so that the bus bars 4, 6 are attached to the printed circuit board 42. Each supporting body 52 comprises at one of the free ends a circular opening 58, within which a threaded bolt for fastening a cable lug is disposed partially in each case in the assembled state. Here, the two openings 58 are located on opposite ends in the longitudinal direction of the high current switch 2.

[0056] FIG. 9 shows a further embodiment of the high current switch 2 in perspective, which with the exception of the design of the first bus bar 4, corresponds to the embodiment shown in FIG. 8. This first bus bar 4 also includes the supporting body 52, which bears against the printed circuit board 42. The circuit board 42 is located, however, between the first bus bar 4 and the second bus bar 6, so that the supporting body 52 is positioned on the side of the semiconductor switches 16, 18. On the supporting body 52, the extensions 54 are also integrally formed with the beads 56, which protrude into the corresponding opening 48.

[0057] The invention is not limited to the embodiments described above. Rather, other variations of the invention to those skilled in the art can be derived therefrom without departing from the scope of the invention. In particular, further, all individual features described in relation to the individual embodiments can be combined in a different way with each other without departing from the scope of the invention.

[0058] The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.