WO2012123203A1 - Start-current limiting device - Google Patents

Abstract

The invention relates to a start-current limiting device comprising a first electric connection part (26) which is associated with a motor vehicle battery pol (9), a second electric connection part (24) which is associated with a starter (10), and a current strength control device (12) which electrically connects the first connection part (26), at least temporarily, to the second connection part (24). A first current path extends from the first connection part (26) to the second connection path (24) by means of the current strength control device (12). In order to protect the current strength control device (12) from overloads, a resistor (14) which is electrically connected in parallel to the current strength control device (12) and which connects the first connection part (26) to the second connection part (24) is connected to the connection parts (24, 26) in such a manner that the resistor (14) is in contact with the first connection part (26) by means of a first web and is in contact with the second connection part (24) by means of a second web and one surface of the web which faces one connection part (24, 26) extends parallel in relation to a surface of the connection parts (24, 26) facing the resistor (14).

Description

 Start current limiting device

The subject matter relates to a starting current limiting device having a first electrical connection part associated with a motor vehicle battery pole, a second electrical connection part assigned to a starter, and one of the first

Connecting part with the second connection part at least

Temporarily electrically connecting current control device, wherein a first current path from the first connection part via the current strength control device extends to the second connection part.

In the context of the discussion about saving potentials at the

Fuel consumption of motor vehicles is often the

Start / stop automatic mentioned. In this is the

The vehicle's internal combustion engine automatically shuts off during prolonged idle periods. If the user wants to continue, he simply presses the accelerator pedal and the engine starts automatically again. When such a warm start process called the

 Electric starter motor of the internal combustion engine, short starter or starter called, with a very high performance

are driven. If in a vehicle only a single battery, e.g. a lead-acid battery or a lithium-ion battery is built in, it comes through the high

Power requirement of the starter to a voltage drop at the battery poles. This voltage dip can cause comfort consumers are no longer supplied with enough power and work incorrectly. The starter is activated in a warm start with the armature in the down position. The starter is usually a series-wound motor, it comes to a short circuit on the armature winding. This leads to a very high starting current, which can be several 100 A. However, the battery voltage at the battery poles usually breaks down at this moment. This is also described, for example, in DIN 40839, which shows the voltage curve of the vehicle electrical system voltage in a starting curve.

In order to prevent it to function losses in the

Comfort consumers, such as navigation systems, car radios, telecommunications systems, air conditioners and the like, is already known in the art

suggested that the starting current for a warm start too

limit. In particular, it is already proposed that

Comfort consumers to operate over a so-called backup battery. This technology is known for example from DE 10 2007 062 955 AI. However, it is necessary both the backup battery and the main battery

head for. The backup battery also increases that

Weight of the entire vehicle.

It is also proposed to direct the starting current through a current-control device. This circuit limits the energy transferred to the battery by pulse width modulating the current.

In the known starting current limiting devices

However, in the case of pulsed start current limiting via the amperage control device, large

Power fluctuations. These can be disadvantageous, in particular These can lead to high induced voltages in the starting current limiting devices.

For the above reason, the object of the present invention was to provide a starting current limiting device in which the effects of induced

Tensions are reduced.

This task is accomplished by a

Starting current limiting device according to claim 1 solved.

As already explained at the beginning, it is necessary to provide consumers of comfort within the motor vehicle with sufficient voltage even in the case of a warm start. Especially in the warm start case, it can lead to voltage drops in the

 Motor vehicle battery come that lead to a malfunction of the comfort consumers. To avoid this

Voltage dips are different

 Current limiting devices possible. One way of limiting the current is to switch a resistor in parallel with a current control device.

Immediately at the beginning of the boot process, just when the highest current flows from battery to starter, is the

Amperage control device opened. That is, immediately at the beginning of the starting operation, no current flows through the current-controlling means. As a result, the high current spikes at the beginning of the starting process can not lead to the destruction of the amperage control device.

In particular, when the amperage control device is formed of semiconductor devices, it may be at these high To avoid this, the proportion of material in the

 Semiconductor devices are inappropriately high. This resulted in increased costs. To avoid this, the resistance is suggested.

Above the resistor flows immediately at the beginning, i. in the first 10 to 50ms of the starting process the starting current. The resistor leads to a current limit, so that the

Voltage on the battery does not completely collapse.

After the starting process has started, especially when the armature winding of the starter is no longer in the short circuit

is operated, in particular after 10 to 50 ms after the start of the boot process, the current-strength control device can be switched on. The amperage control device may, as mentioned, be formed of semiconductor devices. In particular, transistors as well as thyristors can be used. The amperage control device may regulate the current along a first current path via the connection parts, in particular in a pulsed operation. The pulsed turning on and off of the amperage control means can regulate which energy is transferred from the battery to the starter. The resistor arranged in parallel with the current-intensity control device continues to carry a certain part of the total current between the battery and the starter along a second current path. Due to the pulsed switching on and off of the starter current by means of the current-intensity control device, large current fluctuations occur within the switching circuit which increases leads to very high induced voltages within the circuit.

To avoid this, the inductance should be off

Resistance and amperage control means formed resonant circuit should be as low as possible. A first measure for reducing the inductance of the resonant circuit may be that a resistor connected in parallel to the current-strength control device and connecting the first connection part to the second connection part is arranged on connection parts in such a way that the resistor with a first leg is connected to the first connection part

is contacted and contacted with a second leg with the second connector part and a one

Connecting part facing surface of a leg parallel to a surface facing the resistance of the

Connecting part runs.

It is also proposed that the legs of the resistor span a surface which extends parallel to a surface of the resistor facing at least one connection part. In this way it can be achieved that the resistor can be guided as close as possible to the connection part. By reducing the gap between the legs and the respective terminal part, it is possible to reduce the magnetic flux between the resistor and the terminal part, resulting in a reduced inductance.

It is also proposed that at least one connection part is formed as a flat part and that through the legs

spanned surface parallel to the wide, the resistance-facing surface of the flat part runs. run Resistance and terminations substantially plane-parallel also allow this to reduce a gap between the components, which reduces the inductance of the device.

For this purpose, it is also proposed that the surface spanned by the legs extends parallel, preferably plane-parallel, to a surface spanned between the connection parts.

Particularly favorable is an arrangement in which the legs encompass at least two, preferably three sides of the current-strength control device. The legs of the resistor can rewrite a unilaterally open rectangle or triangle. The opening may point away from connection contacts -1-7 .Ais ch.1ULS StQ- 1 IL 6 or in the direction of the connection contacts of the

Have connecting parts.

It is also proposed that a second current path from the first connection part via the resistor to the second

Connecting part runs. Thus, in the case of starting current, current initially flows over the second current path until the current-strength control device is switched on. Then current flows over both current paths.

It is also proposed that the current flow direction in the first current path is at least partially opposite to the current flow direction in the second current path. If the current flow directions are opposite, then the induced voltage within the resonant circuit can be reduced. The first rung runs between the Connecting parts on the amperage control device. That is, current can flow from the battery to the first terminal part, from there via the amperage control means to the second terminal part and then from the second terminal part

Connecting part out in the direction of the starter. This may be the first rung.

The second current path also leads from the battery into the first connection part. From there, the current passes through the resistor to the second connector and further out of the second connector to the starter. It should be mentioned that purely by way of example the direction of current flow in the technical current direction, namely from the positive pole of

Motor vehicle battery to the starter has been described, but also the opposite direction of current flow is possible and also leads to the two current paths.

It is possible that the current paths at least partially

are opposite. In particular, in the field of

Connecting parts of an opposite current path can be realized such that the electron movement within the legs of the resistor opposite to the

Electron movement within the shots is. In the case of opposite current flow directions

be spoken within the current paths. In this case, in the gap between the legs of the resistor and in the gap between the connecting parts to opposite B field lines, which leads to a reduction of the inductance. But it is also possible that the current paths at least

are partially rectified. In particular, in the region of the connection parts, a rectified current path can be such be realized that the electron movement within the legs of the resistor rectified to the

Electron movement within the shots is. In the case of rectified current flow directions

be spoken within the current paths. In this case, it comes in the gap between the respective legs of the

Resistance and the respective connection parts too

opposite B field lines, which also leads to a reduction of the inductance.

In order to minimize the induced voltages in the event of a start, it is proposed that the resistor be arranged spatially in such a way to the connection parts, that in a gap between the connection parts and the resistor, the B field lines generated by the currents in the first and the second current paths at least partially opposite each other are at least partially rectified. The B fields generated by the electron movement around the connection parts or around the resistance can be such that the spatial arrangement of the resistor leads to the connection parts such that the B field lines are opposite in a gap between resistor and connection parts. This leads to a reduction in the inductance of the resonant circuit of amperage control device, connection parts and

Resistance. But it is also possible that in a gap between the legs of the resistor and in a gap between the connecting parts, the B-field lines are opposite. Since the resistance is in parallel with the current

Control device is connected and the resistor with the amperage control device via the connection parts is electrically contacted, formed between the resistor and the amperage control device, an electrical resonant circuit. Its inductance must be as low as possible in order to keep the induced voltages as low as possible. If the B field lines are opposite to each other, the inductance of this resonant circuit can be kept low.

It is particularly advantageous if the B-field lines run at least partially antiparallel. Just then, the B-fields can at least partially cancel each other around the resistor or the connecting parts. Because in the

Connecting parts higher currents can flow than in

Resistance, especially as part of the current in the

Connecting parts via the current control device flows and a second part on the resistance, the amounts of B fields around the resistor and the connecting parts are not always the same size. Nevertheless, the inductance of the oscillation circuit can be reduced as long as the B field lines are opposite to each other.

In order to keep the inductance of the resonant circuit as low as possible, it is proposed that the resistor be at least partially parallel to at least one connection part

is arranged. If the resistor runs at least parallel to the connection part, can by a suitable

Contacting the resistor can be achieved at the connection part, that the current directions within the resistor and the connection part are opposite.

According to an advantageous embodiment is

suggested that the resistance to at least one Connecting part is arranged that one out of resistance,

Connecting parts and amperage control device

formed electrical resonant circuit has an inductance of less than 500mH, preferably less than 200mH, more preferably less than lOOmH. The smaller the inductance of the resonant circuit, the lower it is

indicated voltage due to the pulsed by the current control device current.

According to an advantageous embodiment is

suggested that a gap between at least one

Connecting part and the resistor is formed and

in particular that the resistance is spaced apart from at least one connection part at a distance of less than 2 mm, preferably less than 1 mm, in particular less than 0.5 mm. In order to keep the inductance of the resonant circuit as low as possible, the resistance must be as close as possible to the

Be arranged connecting part. This is a gap

suggested that is less than 2mm in size. The gap is preferably isolated. For this purpose, the connection part with an insulator powder-coated, spray painted, painted, steamed, printed, in particular by screen printing or extruded. According to an advantageous embodiment is

proposed that the resistor and / or at least one of the connecting parts is formed as a flat part. This has the advantage that the resistance and the connection parts can be made as simple as possible. In addition, the resistor can be arranged very close to the connection part, if this as well as the resistor is formed as a flat part. Then all you have to do is connect the connector to an insulator be coated and the resistor can be placed directly on the insulator. In this case, distances of less than 1mm are possible. According to an advantageous embodiment is

proposed that at least one connection part a

rectangular flat part with a resistance-facing surface with a larger dimension in the direction of current flow in the second current path than transverse to the direction of current flow in the second current path. The connection part is thus

formed elongated elongated tongue. Preferably, the resistor is arranged over the wide, the resistance-facing surface of the flat part and separated only by an insulator of the connecting part.

According to an advantageous embodiment is

proposed that at least one connection part at a first end has a contact region for the resistor and at a second end has a connection contact. Since the contact area for the resistor is at an end other than the terminal contact, the current must first flow through the entire terminal to the contact area to flow into the resistor. If the resistor then again runs in the direction of the terminal contact, there is an opposite current flow direction in the resistor. Are the shots then synonymous with each other over the

Current control device contacted so flowing from the terminal contact a current in the connection part. From there, part of the current flows via the amperage control device to the second connection part and from there out of the connection part. The current flows along the first connector and then branches in each case existing component of the amperage control device. Finally, the current reaches the contact area and flows to the resistor. The current flows via the resistor to the second connection part. The current flow direction in the resistor is then preferably opposite to

 Current flow direction in the connection part, when the resistor is parallel to the connection part, but is contacted only at the end of the connection part with this. According to an advantageous embodiment is

proposed that at least one terminal part at a first end has a contact area for the resistor and the same end has a terminal contact. Since the contact area for the resistor is at the same end as the terminal contact, the current flows directly from the contact area into the resistor and, in parallel, via the terminal part to the amperage control device. If the resistor then runs parallel to the connection part, the result is a rectified one

Current flow direction in the resistor and in the connection part. If the connecting parts are then also in contact with one another via the current-strength control device, then flows from

Connection contact a current in the connection part. From there, part of the current flows via the amperage control device to the second connection part and from there out of the connection part. The current flows along the first connection part and then in each case branches off into an existing component of the current-strength control device. The current flows to the second via the resistor

Connector. The current flow direction in the resistor is preferably then rectified to the direction of current flow in the connection part when the resistance is parallel to the Connecting part runs, and already at the end of the

Terminal contact of the connector is contacted with this. According to an advantageous embodiment is

proposed that the resistance extends from the contact area parallel to the connector in the direction of the terminal contact. According to an advantageous embodiment is

suggested that the resistor is U-shaped. The long legs of the U can parallel to the respective

Connection parts run. The short leg extends transversely to the connecting parts and thus bridges a gap formed between the connecting parts.

It is also possible that the resistor is formed V-shaped. In this case, the two legs can run at an angle to the respective connection parts. However, it is also achieved in the V-shape that the current flow directions in the

Connection parts or the resistance are substantially opposite to each other.

According to an advantageous embodiment is

suggested that the resistor is a shunt. With the help of the shunt, it is possible to accurately measure the voltage across the resistor and thus accurately determine the current across the resistor. With the aid of such a measurement, it is possible to detect a short-circuit condition within the battery starter circuit. In particular, if no terminal 50 signal, thus no start signal is present and

even though a high current is measured across the resistor, can be assumed by a short circuit and a

Separator between the battery and the

Starting current limiting device is arranged can

to be activated. This separator can be activated pyrotechnically, for example.

According to an advantageous embodiment is

suggested that the resistance along with the

Connecting parts is arranged in a housing. In this case, a secure insulation of the resistor and the connection parts is guaranteed.

On the other hand it is also suggested that the

Resistor is arranged outside a housing of the connection parts. This leads to better heat dissipation via the resistor. especially the

Current control device having semiconductor components generates high heat loss. This heat must be dissipated. With the help of the resistor heat dissipation is possible, especially when the resistor is arranged outside of a housing.

The resistance also leads to the connection parts being thermally coupled to one another. The thermal coupling ensured by means of the resistor makes it possible to achieve a thermal symmetrization of the connection parts. That means the temperature in the two

Connection parts is symmetrized as possible, especially at high losses within the amperage control device. Especially in the case of starting high currents of several 100A arise in the current control device high temperatures due to electrical losses. These high temperatures must be dissipated and it is advantageous if this happens over the largest possible area. By a thermal symmetrization of the connection parts, the thermal discharge area is increased, since both connection parts can be used for heat dissipation.

According to an advantageous embodiment, the

Connecting parts parallel flat parts. Between the parallel flat parts, a gap may be formed, which may be filled with an insulator. The gap between the connection parts is advantageously bridged by the resistor as well as the amperage control device. The connection parts are then both the current control device as well as over the

Resistance contacted each other. In the starting case, after the lapse of a waiting time of a few milliseconds, a pulsed current flows through the current-intensity control device, whereas a continuous current flows through the resistor.

According to an advantageous embodiment, the

Connecting parts in the region of the resistor electrically

isolated. This means that the resistor can lie as close as possible to the connection parts, but does not make electrical contact with them. Only in the region of a contact region can an electrical contact between resistor and

Connection part allows his. It is possible that the contact area in the manufacturing process with a solder paste, for example, in a screen printing process and the resistor is then soldered to the contact area.

According to an advantageous embodiment is

proposed that the connection parts are electrically contacted with the amperage control device, and preferably that the connection parts mechanically carry the amperage control device. The connection parts can take on both electrical and mechanical tasks. For a highly integrated design, the connection parts can serve as a mechanical support for the components, preferably semiconductor components, such as transistors and thyristors of the amperage control device. The features described above and in particular also the features of the independent and the dependent claims can be freely combined with each other, even bypassing the features of the independent claims, and justify an invention as it were.

Subsequently, the object is determined by a

 Embodiments drawing showing explained. In the drawing: FIG. 1 shows an electrical equivalent circuit diagram of a

 Starting current limiting device according to a

 Embodiment;

Fig. 2 is a schematic view of a

Starting current limiting device with a separating device; Fig. 3 is a further schematic view of a

Starting current limiting device with a separator; Fig. 4 is an exploded view of a

 Starting current limiting device according to a

 Embodiment;

Fig. 5 is a starting current limiting device in

 assembled condition;

6 shows a detailed view of a separating device;

7a is a view of two connecting parts during the

 Manufacturing process according to an embodiment;

7b connecting parts equipped with a current-strength control device and a resistor according to an embodiment;

8a is a view of two connecting parts during the

 Manufacturing process according to an embodiment;

8b connecting parts equipped with a current-strength control device and a resistor according to an embodiment;

Fig. 8c another possible arrangement of a resistor to the connecting parts after a

Embodiment; Fig. 9a an additional way of connecting the resistor to the connecting parts after a

 Embodiment;

Fig. 9b an additional way of connecting the

 Resistance to the connecting parts after one

 Embodiment;

10 is a view of connecting parts with resistance,

 Starting current control device and

 Evaluation device;

Fig. 11 is a schematic sectional view through the

 Connecting parts and the resistor of Figure 7a showing the current directions and the B-field lines.

Fig. 12 is a schematic sectional view through the

 Connection parts and the resistor of FIG. 8a to illustrate the current directions and the B-field lines.

Fig. 1 shows an electrical equivalent circuit diagram of a

Starting current limiting system 2 with a

Starting current limiting device 2a and a

Separator 2b. It is also shown that the

Starting current limiting device 2a a first

Terminal contact 4 and a second terminal contact 6 has. The first connection contact 4 is assigned to an electric battery 8. The second connection contact 6 is assigned to an electric starter motor 10. Thus, Fig. 1 shows an electrical starter circuit. The starter current flows in the starting case of the

Motor vehicle battery 8, in particular from the positive pole of

Battery 8 via the starting current limiting system 2 to the starter 10th

The starter 10 requires a high electric power in the starting case, both the warm start and the cold start. As a result, the current in the shown circuit from the battery 8 to the starter 10 is very high. Especially in warm start, so if comfort consumers already

are turned on, it must be prevented that the voltage across the battery terminals of the battery 8 collapses. This could lead to comfort consumers losing functionality. In order to prevent this voltage dip, the starting current limiting device 2a is proposed.

The starting current limiting device 2a is made of a

Amperage control device 12 and a resistor 14 is formed.

The amperage control device 12 is preferably formed from a parallel connection of a plurality of semiconductor components, in particular a plurality of semiconductor switches, in particular a plurality of transistors operated as switches.

The resistor 14 is preferably a low impedance

Resistance, which can also be suitable as a shunt for measurement purposes.

Between the connection contacts 4 and 6 forms the

Parallel connection of amperage control device 12 and resistor 14 a resonant circuit 13. The induced voltage in the resonant circuit 13 is dependent on the one of the current fluctuation within the resonant circuit 13 and the inductance L of the resonant circuit 13. The voltage U dl

follows the equation U = ~ L-, where L is the inductance of the

Resonant circuit 13 represents and di / dt the gradient of the current.

Particularly in the case of a pulsed current control by the current-strength control device 12, there are great

 Current fluctuations that induce high voltages in the resonant circuit 13, which must be avoided. Therefore, the inductance of the resonant circuit 13 is as low as possible

form as will be shown below.

The starting current limiting system 2 also has the separating device 2b, which is preferably formed as a pyrotechnic separation device. The separator can also be used as a fuse or as a semiconductor switch

be formed. The separator 2b serves to

Battery 8 completely from the

 Start current limiting device 2a and separate from the starter 10. The separating device 2b is preferably

pyrotechnic or formed as a semiconductor switch and is controlled by a trigger signal 29. The trigger signal 29 may originate from an airbag control unit. It is too

possible that the trigger signal is triggered depending on a voltage across the resistor 14. For example, a control circuit 28 may measure the voltage drop across the resistor 14. Via an external connection 30 can be checked, for example, whether a starter signal, in particular a terminal 50 signal is present or not. Only in the case of the start signal, a current may flow through the resistor 14, since only then the starter 10 must be supplied with power. If no start signal is detectable at the terminal 30, it can be assumed that no startup procedure

is present. If in this case a current flows through the resistor 14 and thus a voltage drop is detected by the control circuit 28, a trigger signal 29 can be given to the separator 2b. The separator 2b separates the electrical connection between the battery 8 and the

Starter 10, so that no electricity can flow.

Fig. 2 shows a possible arrangement of the separator 2b within the starter circuit. Fig. 2 shows schematically the motor vehicle battery 8. At the positive pole of

Motor vehicle battery 8, a battery terminal 9 may be connected. Immediately to the battery terminal 9, for example, also integrally formed with the battery terminal 9, the separator 2b may be provided.

In this case, the separating device 2b can be formed from a first, pyrotechnic part and a second, movable part, as will be explained below. As can be seen, the starter line 16, which the

Battery 8 connects to the starter 10, thus directly to the battery terminal 9 through the separator 2b

be separated. In the case of separation, therefore, the entire starter line 16 is voltage and de-energized.

The starting current limiting device 2a can both

directly on the separator 2b and the Batteriepolklemme 9 as well as anywhere else in the starter line 16 may be arranged, as shown in Fig. 3. Fig. 3 shows another possible arrangement of

 Detecting device 2b in the starter line 16. It can be seen that the separator 2b not directly to the battery terminal 9, but in the starter line 16 between battery terminal 9 and

Starting current limiting device 2a is arranged. Then, in the case of disconnection, only the starter line 16 between the separator 2b and the starter 10 is flowing and

energized. The starter line 16 in the region between the battery pole terminal 9 and the separator 2b remains contacted with the battery. As long as this area lies in a non-critical area of the vehicle, this is

unproblematic.

4 shows an exploded view of a possible embodiment of a starting current limiting system 2 with a starting current limiting device 2 a and a

Separator 2b. It can be seen that the

Separator 2b is integrally formed with the battery terminal 9. As can be seen, the separator 2b may be equipped with a pyrotechnic squib 34. The squib 34 is in a firing channel 36 in the

Separating device 2b arranged. On the other side of the firing channel 36, the connection contact 4 can be shaped as a pot or cup 38 and introduced into the firing channel 36. In the case of a triggering condition, an ignition signal is transmitted via the line 29 to the squib 34. The squib 34 explodes then and in the shot channel 36 is formed

Overpressure. As a result of this overpressure, the tab of the connection contact 4, which is formed at right angles to the connection part 26, is pressed out of the firing channel and bent with the pot 38.

This results in an electrical separation of the battery 9 from the terminal 4. It can also be seen that the terminal 4 opens in a first connection part 26. The first connection part 26 is encapsulated with a second connection part (not shown here) 24 in a housing of the starting current limiting device 2 a. Furthermore, it can be seen that the second

Connecting part 24 in the terminal contact 6. Der

 Terminal contact 6 protrudes out of the housing 19 just like the terminal 30. The connection contact 6 is used for

electrical contacting of the starter line 16 with the starting current limiting device 2a. The starter line 16 can be welded to the terminal contact 6, soldered or screwed.

The entire starting current limiting system 2 can be encapsulated with a housing 18, as shown in FIG.

Furthermore, it can be seen in FIG. 5 that an electrical support point 20 is led out of the housing 18. The electrical base 20 is used to connect the electrical system of the motor vehicle to the battery terminal 9 and thus the battery 8. The base 20 is not through the

Separator 2b secured against the battery terminal 9, so that even in the case of release of the separator 2b of the base 20 with the battery terminal 9 in electrical contact remains. This means that when the disconnecting device 2b is triggered in the event of a short circuit on the starter line 16, the rest of the vehicle can remain in contact with the battery 8 and a separate fuse can be made here.

The structure of a separator 2b is shown in more detail in FIG. In Fig. 6, the battery terminal 9 is shown with the separator 2b in a partially cutaway state.

It can be seen that the pyrotechnic squib 34 is arranged in a firing channel 36. The firing channel 36 is closed on the other side by the pot 38 of the terminal 4. Preferably, the firing channel is sealed at least in the region of the squib 34 by a housing 40. The housing 40 may be molded around the firing channel 36. It can also be seen that the support point 20 from the

 Housing 40 is led out and not over the

Separator 2b is secured relative to the battery terminal 9. Finally, it can be seen that over an electrical

Control line 29 an igniter 32 can be ignited. The ignition device 32 can be activated either via a signal of an airbag control unit or by a signal from the evaluation circuit 28, as already explained above. In the case of igniting the squib, the pot 38 of the

Terminal 4 pressed in the direction X from the firing channel 36. An electrical connection between battery terminal 9 and terminal 6 is interrupted.

The Figs. FIGS. 7 to 10 show semi-finished components during a manufacturing process for a

Start current limiting device 2a arise. First, two flat parts, preferably copper plates are arranged side by side as stamped and bent parts, as shown in Fig. 7a. Between the flat parts, the first

Form terminal 26 and the second terminal part 24, a gap may be filled with an insulator 25. The first

Connecting part 26 may be bent so that the

 Terminal contact 4 angled, preferably perpendicular to the course of the first connection part 26 extends. At the first connection contact 4, a pot 38 can be formed in the stamping bending process.

The terminal contact 6 may at one end of the second

Connecting part 24 may be formed.

It can also be seen that on the surface A of the

Connection parts 24, 26, except for the connection contacts 4, 6 and the contact regions 27a, 27b, an insulator 15a,

preferably applied in a screen printing process. The insulator 15 a is used to insulate the connection parts 24, 26 from the resistor 14.

The surface A is that surface of the flat part which will face the resistor 14. 7a shows the first connection part 26, which has the connection contact 4 with the pot 38 at its first end and the contact region 27b at its second end. Furthermore, FIG. 7 a shows the second connection part 24, which has the connection contact 6 at its first end and the contact region 27 a at its second end.

Preferably, a solder paste can be applied to the contact regions 27a, b by means of a screen printing process.

Subsequently, in the insulator 15a, on the

Connecting parts 24, 26 is applied, a

Connection possibility for a current control device 12 may be provided. For this purpose, contact areas can be milled, drilled or etched into the insulator 15a at various locations.

Subsequently, first, as shown in Fig. 7b, the resistor 14 on the connecting parts 24, 26, and the

 Isolator 15a are placed. The resistor 14 is in the example shown U-shaped, and the long legs of the resistor 14 are parallel to the respective

Connecting part 24, 26 and the short leg extends

perpendicular to it. It can also be seen that the resistor 14 rests on the insulator 15a of the connecting parts 24, 26. The resistor 14 is formed as a flat part. The legs of the resistor 14 span a surface which is plane-parallel to the surface A.

It can also be seen that the resistor 14 on the

Connecting parts 24, 26 in the contact areas 27a, 27b rests. By means of a soldering process, for example in a reflow oven, the resistor 14 with the

Contact areas 27 are soldered. This creates an electrical connection between the resistor 14 and the connection parts 24, 26 in the region of the contact regions 27.

A cross section through the construction of connection parts 24, 26 and resistor 14 is shown in FIG. 11. In FIG. 11 it can be seen that the resistor 14, separated by a gap 15 filled with an insulator 15a, rests on the connection parts 24, 26 spaced from the connection parts 24, 26. Furthermore, the current flow directions in the

Connection parts 24, 26 and the resistor 14 shown. It can be seen that the current flow directions in the

Resistor 14 and the respective connection part 24, 26 is opposite. The current flow direction in the

Connecting part 26 is an example in the plane of the drawing and in the resistor 14 in the region of the connection part 26 from the drawing level out. Conversely, this is in the region of the connection part 24, where the direction of current flow in the region of the resistor 14 points into the plane of the drawing and points out of the plane in the region of the connection part 24. This is due to the fact that the current, as can be seen in Fig. 7b, from the terminal contact 4 at one end of

Connecting part 26 to the contact portion 27 b at the other end of the connecting part 26 flows. Of the

Contact area 27b then flows the current through the resistor 14 in the opposite direction, first to the short

Leg and from there to the contact area 27a. from

Contact area 27a, the current flows from one end of the Connecting part 24 to the arranged at the other end of the connecting part 24 terminal contact. 6

By the opposite directions of current flow 15 rectified B fields 17, 21 and in the gap filled by the insulator 25 opposite B fields 17, 21 are formed in the region of the gap. It can be seen that the B field 17 a by the current in the resistor 14 left while the B-field 21a is dextrorotatory. The B field 17b through the current in the resistor 14 is dextrorotatory and the B field 21b again turns left. Thus, the B field lines of the B fields 17, 21 are rectified in the region of the gap 15, preferably parallel, and in the region of the insulator 25, the B fields 17a, 21b and 17b, 21a are opposite, preferably

antiparallel.

Since the current in the resistor 14 can be temporarily slightly lower than in the connecting parts 24, 26, which is because a part of the current over the

Current control device 12 can flow from the connector 26 to the connector 24, the B-fields are not always the same strength. However, the small gap 15 of preferably less than 1mm despite the opposite

Current flow direction in the resistor 14 and the

Connecting parts 24, 26 to the fact that the resonant circuit 13 has a low inductance, preferably less than 500mH.

8a shows the first connection part 26, which has the connection contact 4 with the pot 38 at its first end and also the contact region 27b at this end. Furthermore, Fig. 8a shows the second connection part 24, which at its first end has the terminal contact 6 and also at this end the contact portion 27a.

Likewise, as in FIG. 7a, the insulator 15a is applied and the contact region 27 is formed.

As shown in Fig. 8b, the resistor 14 on the

Connecting parts 24, 26, and the insulator 15 a are placed. The resistor 14 is U-shaped in the example shown, and the long legs of the resistor 14 are parallel to the respective connection part 24, 26 and the short leg is perpendicular thereto. The opening of the resistor points in the direction of the connection contacts 4, 6. This is exactly the opposite according to the example in FIG. 7b. There, the opening of the profile of the resistor of the connection contacts 4, 6 away. It can be seen in FIGS. 7b and 8b that the profile of the resistor 14 surrounds the amperage control device 12 on three sides. A cross section through the construction of connection parts 24, 26 and resistor 14 according to FIG. 8b is shown in FIG. In FIG. 12 it can be seen that the resistor 14 is separated by a gap 15 filled with an insulator 15a

spaced from the connecting parts 24, 26 on the

Connecting parts 24, 26 rests. As also shown in Fig. 11, a surface B of the resistor 14 in the direction of

Surface A of the connecting parts 24, 26. The

 Current flow directions in the connection parts 24, 26 and the resistor 14 are shown in FIG. 12.

It can be seen that the current flow directions in the

Resistor 14 and the respective connection part 24, 26th are rectified. The current flow direction in the connection part 26 is, for example, out of the plane of the drawing and in the resistance 14 in the region of the connection part 26 also out of the plane of the drawing. Conversely, this is in the area of the connection part 24, where the

 Current flow direction in the region of the resistor 14 in the

Pointing into the drawing plane and also points in the plane of the connecting part 24 in the plane of the plane. This is because the current, as can be seen in Fig. 8b, from the terminal contact 4 at one end of

Connecting part 26 to the contact portion 27 b at the same end of the connecting part 26 flows. In addition, the current flows along the connection part 26 into the current intensity control device 12. From the contact region 27b, the current also flows through the resistor 14 in the same direction as in the connection part 26 first to the short leg and from there to the contact region 27a. From the contact region 27a, the current flows from the resistor to the terminal contact 6. In the connection part 24, the current of the current-intensity control device 12 also flows in the direction of the

Terminal 6 and thus also in the same

Direction . By the rectified current flow directions arise in the region of the gap 15 opposite B fields 17, 21 and in the filled gap 25 through the insulator 25 rectified B fields 17, 21. It can be seen that the B field 17a by the current in the resistor 14 and the B-field 21a are turning to the left. The B-field 17b by the current in the resistor 14 and the B-

Field 21b are dextrorotatory. Thus, the B field lines of the B fields 17, 21 are in the region of the gap of the insulator 25, preferably parallel and in the region of the gap 15, the B-fields 17a, 21b and 17b, 21a are opposite, preferably antiparallel. Fig. 8c shows a similar construction as Fig. 8b, but it can be seen that the current-strength control device 12 is encapsulated with the connection parts 24, 26 in the housing 19 and the resistor 14, contacted via the

Contact areas 27 is arranged outside of the housing 19.

Fig. 9a shows a similar structure as in Fig. 8b, but here is the resistor 14 on the current-strength control device 12 facing away from the surface A '

Connecting parts 24, 26 arranged.

Fig. 9b shows a similar construction as Fig. 8b, wherein the resistor 14 is formed here but not by a U-shaped plate, but rather as a between the

Contact areas 27 arranged cable is formed.

Fig. 10 shows the structure of the starting current limiting device 2a at a further advanced stage. It can be seen that the control circuit 28 is provided above the resistor 14. The control circuit 28 may on the one hand serve to evaluate the voltage across the resistor 14 and thus via the terminal 30, a drive signal 29 for

Activation of the separator 2b generate.

In addition, via the terminal 30, a control signal can be received in the control circuit 28, with the aid of which the semiconductor switches in the amperage control device 12 of the starting current limiting device 2a can be controlled. In particular, a pulsed operation of the semiconductor switches can take place. With the aid of a pulse width modulated start current, it is possible to regulate the electrical energy transferred from the battery 8 to the starter 10, so that the starting process of the starter 10 can be controlled.

On the other hand, it is possible to open completely through the control circuit 28 current control device 12, so that in particular at the beginning of a startup, preferably in the first 10, 20, 30, 40 or 50ms of the current

flows exclusively through the resistor 14. First

subsequently, a closing of the semiconductor switch

Amperage control device 12 take place, wherein the semiconductor switches pulsed, in particular in a

pulse width modulated methods are opened and closed, so that the power also partially over the

Amperage control device 12 can flow. With the help of the device shown it is possible to

 Starter line and the starter in the event of a crash to de-energize and de-energized. Furthermore, it is possible to

Limit starting current while protecting the semiconductor of a start current limiting device from overcurrents. Moreover, it is possible to keep the induced voltages in the starting current limiting system as low as possible, and finally, a thermal symmetrization and thus a good heat dissipation can be realized.

Claims

 Pat ent to sp rüche Starting current limiting device with a first electrical connection part associated with a vehicle battery terminal, a starter associated second electrical connection part, and one the first connection part with the second  Connecting part at least temporarily electrically connecting amperage control device, wherein a first current path extends from the first connection part via the current-strength control device to the second connection part, characterized , that is electrically connected in parallel with the current-strength control means, the first Connection part is arranged with the second connection part connecting resistor such connection parts, that the resistor is contacted with a first leg with the first connection part and with a second leg with the second connection part is contacted and a connection part facing surface of a leg parallel to a the Resistance-facing surface of the connection part runs. Starting current limiting device according to claim 1, characterized in that the legs span a surface parallel to a resistor facing surface of at least one Anscl runs. Starting current limiting device according to claim 1 or 2, characterized in that at least one connecting part is formed as a flat part and the plane spanned by the legs surface parallel to the wide, the Resistance-facing surface of the flat part runs. Starting current limiting device according to one of preceding claims, characterized in that the surface spanned by the legs parallel, preferably plane-parallel to one between the Connecting parts spanned surface runs. Starting current limiting device according to one of preceding claims, characterized in that the legs engage around at least two, preferably three sides of the current-controlling device. Starting current limiting device according to one of Claims 1 to 4, characterized in that a second current path extends from the first connection part via the resistor to the second connection part. Starting current limiting device according to one of preceding claims, characterized in that the current flow direction in the first current path is at least partially opposite to the current flow direction in the second current path or that the Current flow direction in the first current path at least is partially rectified to the current flow direction in the second current path. Starting current limiting device according to one of the preceding claims, characterized in that the resistor is arranged spatially in such a way to the connection parts that in a gap between the  Connection parts and the resistance of the B-field lines generated by the currents in the first and the second current path are at least partially opposite or at least partially rectified. Starting current limiting device according to one of  preceding claims, characterized in that the resistor is arranged to at least one connection part that a formed of resistor, connection part and amperage control device  electrical resonant circuit has an inductance of less than 500mH, preferably less than 200mH, more preferably less than 100mH. Starting current limiting device according to one of  preceding claims, characterized in that a gap between at least one connecting part and a leg of the resistor is formed and  in particular that at least one leg of the resistor is spaced apart from at least one end part at a distance of less than 2 mm, preferably less than 1 mm, in particular less than 0.5 mm. 11. starting current limiting device according to one of  preceding claims, characterized the resistor is formed as a flat part. 12. Starting current limiting device according to one of the preceding claims, characterized in that at least one connection part is a rectangular flat part with a resistance facing surface having a larger dimension in the current flow direction in the second current path than transverse to the direction of current flow in the second current path. Starting current limiting device according to one of  previous claims, characterized in that a contact area for the resistor with a  Connecting part to a connection contact of the  Connecting part facing the end of the connection part ode or at a terminal contact of the connection part facing away from the end of the connection part is arranged. Starting current limiting device according to claim 9,  characterized in that the resistance is  starting from the contact area parallel to  Connecting part runs. Starting current limiting device according to one of  preceding claims, characterized in that the resistor is U-shaped, wherein the long legs at least partially parallel to the respective Run connecting parts and the short leg transverse to the connecting parts or the resistance is V-shaped, wherein the legs extend at an angle to the respective connection parts. Starting current limiting device according to one of  preceding claims, characterized in that the resistor is a shunt. Starting current limiting device according to one of  preceding claims, characterized in that the resistor is arranged together with the connection parts in a housing or that the resistance  is arranged outside a housing of the connecting parts. Starting current limiting device according to one of preceding claims, characterized in that at least one connection part is electrically insulated in the region of the resistor. Starting current limiting device according to one of preceding claims, characterized in that the connection parts are electrically contacted with the current-strength control means, and preferably that the connection parts mechanically carry the current-strength control means.