EP3133897B1 - Electric heating device and control electronics - Google Patents

Description

The present invention relates to a control electronics for driving an electric heating element of an electric heater, in particular an auxiliary heater of a motor vehicle. The invention further relates to such an electric heater.

Electric heaters are used in numerous applications and serve to heat or heat a fluid. For this purpose, such heaters usually have heating elements which supply heat to a fluid to be heated, in particular a gas. Such heaters are for example from the EP 1 523 225 B1 as well as the EP 1 522 439 A1 known.

To control the heating elements and thus to control the heat supplied to the fluid such heaters usually have a control electronics. Such a control electronics usually includes a printed circuit board made of plastic, in particular composite plastic, for example FR4, are arranged on the electrical switch, such as power semiconductors, for controlling the heating elements. In order to achieve the desired heating of the fluid to be heated usually high electrical power is necessary, which pass through said electrical switch to the heating elements. The high electrical powers lead to a heat development of the switch, which can lead to damage to the control electronics.

To avoid or at least reduce such damage, it is for example from the DE 10 2011 089 539 B3 or the EP 1 521 499 A1 known to provide the control electronics mounted on the circuit board cooling elements, which are exposed to a flow of the fluid to be heated.

The provision of the heater or the control electronics with such cooling elements, however, requires additional manufacturing steps in the production of the control electronics and the heater. In addition, additional components are necessary. As a result, in particular, the production costs of the control electronics or the heater increase. Also, the drive electronics and / or the heater thereby become more susceptible to malfunction.

From the DE 20 2005 019 094 U1 is an electrical circuit with a at least two mutually electrically insulated metal cores metal core layer known, wherein the metal cores are electrically contacted with connecting elements of a power device, which also electrically contact the metal cores. A housing of the line component is arranged on one of the metal cores and electrically contacted with the core.

The present invention therefore deals with the problem of providing for a control electronics of a heater of the type mentioned and for such a heater improved or at least specify other embodiments, which are characterized in particular by a simple production and / or increased stability.

This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea to use a core of an electrically conductive, metal-containing material for a circuit board of a control electronics for driving an electric heating element of an electric heater. The use of such a printed circuit board leads, in particular compared to conventionally used printed circuit boards Plastic, for improved heat dissipation of an attached to the circuit board electrical switch for controlling the said electrical heating element. As a result, there is an improved cooling of the switch, so that the control electronics and the associated heating simplified can be produced. In particular, this can be dispensed with the use of additional cooling elements. As a result, the production of the control electronics or the heating device is further simplified. Due to the elimination of such cooling elements as additional components, the control electronics is also less susceptible, so that the control electronics can be made more stable overall or more robust.

According to the idea of the invention, the drive electronics thus have the printed circuit board which has the electrically conductive core made of the metal-containing material. The core is preferably made of a metal or a metal alloy. In particular, the core may be made of aluminum and / or copper. The electrical switch serves to drive the heating element and is arranged on the core, wherein the switch has an electrical output connection for electrical connection to the heating element. By means of the electrical output connection thus takes place the driving of the heating element. Here, the output terminal of the switch is electrically isolated from the core. The switch further includes an input terminal through which the switch is electrically powered, wherein the input terminal is also electrically isolated from the core. By placing the switch on the core, heat is dissipated from the switch across the core of the circuit board. This leads to said improved heat dissipation and improved cooling of the switch.

The switch can in principle be designed as desired, provided that it is possible to control the heating element. The switch may be, for example, a power switch, in particular a semiconductor such as a power semiconductor.

It is preferred if the switch is arranged directly on the core, in particular bears directly on the core. This causes the heat exchange between increased the switch and the core and improves the heat dissipation from the switch

As a heating element, in principle, any heating element can be used. Preference is given to heating elements are used, which are designed as a PTC thermistor or have such a PTC thermistor. This means that the heating element used is in particular a PTC element, where PTC stands for Positive Temperature Coefficient.

In advantageous embodiments, the electrical input terminal of the switch is electrically connected to an input track. The input conductive line is arranged between the input terminal and the core, wherein an electrically insulating layer is provided between the input conductive line and the core. That is, the electrical isolation of the input terminal from the core is realized via said electrically insulating layer, wherein the input terminal is electrically connectable to other components of the heater and / or external components via the input wiring. The electrically insulating layer further electrically insulates the input trace from the core.

In this case, it is preferable if the input interconnect runs between the input connection and a first supply connection, which runs during operation of the control electronics or the heating device for electrical connection to a first electrical potential. That is, the switch is electrically connectable to said first electrical potential via the input trace. The first electrical potential is preferably the potential of an electrical source, for example a battery, a rechargeable battery and the like. In particular, it is conceivable that the first electrical potential is a positive pole of the electrical source.

In further preferred embodiments, the output terminal is electrically connected to an output conductive line disposed between the output terminal and the core. In this case, an electrically insulating layer is provided between the core and the output conductor track. That is, the electrical isolation of the output terminal is realized with respect to the core via said electrically insulating layer. The electrically insulating layer also electrically insulates the output trace from the core. Via the output conductor track, the output terminal can be electrically connected to other components, in particular to the heating element.

Input trace and output trace are suitably electrically isolated from each other. For this purpose, the input conductor track and the output conductor track are preferably spaced apart from one another.

The output conductor track advantageously runs between the output terminal and a connection region of the printed circuit board or of the core, which serves for electrical connection to the heating element. That is, the output terminal is electrically connectable to the heating element via the output wiring. In this case, the first connection region and the first supply connection are advantageously arranged at a distance from one another.

Advantageous variants provide an electrical control terminal of the switch for controlling the switch, which is electrically connected to a control track. The control trace is disposed between the control terminal and the core, wherein an electrically insulating insulating layer is provided between the control trace and the core. That is, the control trace and the control terminal are electrically isolated from the core via the electrically insulating layer.

In preferred embodiments, at least one thermally conductive component is provided in at least one of the electrically insulating layers. This results in an improved heat exchange between the core and the switch, which leads to improved cooling of the switch in operation. It is particularly advantageous here if all electrically insulating layers have such thermally conductive constituents. In particular, the respective electrically insulating layer may be a thermal paste or contain such a thermal paste. Alternatively or additionally, at least one such electrically insulating layer is a dielectric.

The core of the printed circuit board can have no further electrical insulation except said electrical insulation with respect to the conductor tracks. This means that the core can be exposed outside of the tracks.

Advantageous embodiments provide for the use of the electrically conductive core for the electrical supply of the switch and / or the heating element. For this purpose, the core is preferably connectable via a second supply connection with a second electrical potential. Here, the second electric potential is other than the first electric potential. This means in particular that the second supply connection and thus the core in operation are at a second electrical potential, while the input conductor track and thus the input terminal of the switch are at a first electrical potential. The second electrical potential may be, in particular, a ground connection or a negative pole or negative pole.

For electrically contacting the core with the heating element, the core has a second connection region, via which the core can be electrically connected to the heating element. This means that the electrical connection of the heating element can be made via the core and via the switch. The connection with the core lying on the second electrical potential takes place in the second Connection area, while the electrical connection with the switch, via the output track, in the first connection area. In this case, the first connection region and the second connection region are advantageously spaced apart from one another.

The respective conductor track can in principle have any desired shape. Preferably, at least one such track, preferably all tracks, web-shaped or band-shaped. That is, the track is not formed as a wire or a wire, but in the form of a track or a belt.

The core or the printed circuit board can in principle have any desired shape. In particular, it is conceivable that the core and thus the circuit board flat or flat.

It is also conceivable that the core has a switch section, a connection section and a supply section, wherein the switch section and the connection section extend inclined relative to one another. In this case, the switch is arranged on the switch portion of the core, while the supply portion is spaced from the connection portion and also inclined to the switch portion. The connection section is used for the electrical and / or mechanical connection of the heating element to the control electronics. This means in particular that the first connection region and the second connection region are arranged in the connection section. The supply section serves for the electrical supply of the control electronics. That is, the first connection area and the second connection area are preferably arranged in the service section.

It is conceivable here that the first connection region and the supply section are inclined in opposite directions from the switch section.

In preferred embodiments, the core is in one piece, in particular formed of the same material. In particular, it is conceivable to manufacture the core as a plate or from a plate.

If the core is formed in one piece, then the switch section, the connection section and the supply section can be realized by a corresponding forming, in particular bending, of such a plate. It is possible to introduce cuts into the core in order to be able to reshape regions differently and / or to separate them from one another.

The switch can be of any desired design, in particular of any shape. In particular, it is conceivable that the switch has a switch housing which at least partially surrounds the switch. It is preferred if the switch housing rests flat on the core. Due to the flat contact of the switch housing on the core, this results in an improved heat exchange of the switch with the core and thus to an improved cooling of the switch. In this case, the housing can be electrically insulated from the core, for example via such an electrically insulating layer.

The electrical heating device having the connection electronics can be used in any application for heating a fluid. In particular, it is conceivable to use the heating device in a motor vehicle, for example as an auxiliary heater. In this case, the heating device is used for heating a gas, in particular for heating air.

The heating device preferably has a flow housing which has a flow space which can be flowed through by the gas to be heated. In the flow space is such an electric heating element for heating or heating arranged the gas. The driving of the heating element takes place via such a control electronics.

During operation of the heating device or in the assembled state of the heating device in the associated application, in particular in the motor vehicle, the supply connections are connected to corresponding potentials, in particular an electrical energy source, for example a rechargeable battery. It is conceivable, in particular, to connect the core to ground and to connect the input track with a positive potential of said electrical source, in particular of the accumulator.

In preferred embodiments, an electronics box or an electronics housing is provided, in which the control electronics is arranged. In this case, the electronics box has an open towards the flow space opening, which is closed by the core. As a result, the core is in heat exchanging contact with the fluid to be heated, in particular with the air to be heated. Preferably, the core is in direct contact with the gas. This leads to an increased heat exchange between the core and the fluid and thus to an improved cooling of the heat exchanging with the core switch.

In particular, it is conceivable to use such a core with a switch section, a connection section and a connection section. In this case, the switch section closes the opening of the electronics box, the switch being arranged on the side of the switch section facing away from the flow space and thus being fluidly isolated from the flow space.

The connection section with at least one such connection region protrudes in the direction of the flow space from the switch section. This can the electrical and / or mechanical connection of the heating element with the control electronics in the flow space and thus made easier.

It is further preferred if the supply section is oriented away from the flow space. This means that the supply section is arranged with the at least one supply connection outside the flow space, in particular in the electronics box.

Advantageously, the electronics box is designed to be electrically insulating. It is conceivable, for example, to produce the electronics box made of plastic. Due to the electrically insulating design of the electronics box, a separate electrical insulation of the control electronics with respect to the electronics box is not necessary.

It is also conceivable to produce the electronics box from an electrically conductive material. Here, the Elektronilbox is advantageous against the circuit board electrically isolated.

Of course, it is possible to provide the control electronics, in particular the core, with cooling elements, in particular with cooling fins, for improved heat exchange of the core with the fluid. In this case, said cooling elements are advantageously arranged on the side facing the flow space, in particular in the switch section. As cooling elements, for example, cooling fins are used.

The electrical connection between the heating element and the control electronics is advantageously carried out via contact plates. It is particularly conceivable that the heating element via a first contact plate with the output conductor track, in particular in the first connection region, is electrically contacted. It is also conceivable that the heating element via a second contact plate, in particular in the second connection region, is electrically contacted with the core. Through the use of such contact plates, a mechanical connection between the heating element and the control electronics is realized in addition to the electrical contacting of the heating elements. In such cases, the core is thus additionally used as a mechanical support of the heating element or as a busbar.

The connection of the respective contact plate with the control electronics can be done in any way. In particular, it is conceivable to glue the respective contact sheet to the control electronics.

Of course, the heater may also have a plurality of such heating elements. In this case, at least one such switch can be assigned to the respective heating element. Accordingly, the control electronics may comprise a plurality of such switches. In this case, the respective switch is preferably associated with such an output conductor track, wherein the output conductor tracks of the different switches are preferably electrically insulated from one another.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components.

Fig. 1 - 3

drei unterschiedliche räumliche Ansichten einer Ansteuerungselektronik,

Fig. 4

einen Schnitt durch die Ansteuerungselektronik,

Fig. 5

eine räumliche Ansicht einer elektrischen Heizeinrichtung mit der Ansteuerungselektronik bei einem anderen Ausführungsbeispiel,

Fig. 6

eine andere räumliche Ansicht der Heizeinrichtung aus Fig. 5,

Fig. 7

eine räumliche Ansicht der Heizeinrichtung bei einem weiteren Ausführungsbeispiel,

Fig. 8

die Ansicht aus Fig. 7 bei einem anderen Ausführungsbeispiel.

It show, each schematically

Fig. 1-3

three different spatial views of a control electronics,

Fig. 4

a section through the control electronics,

Fig. 5

a spatial view of an electric heater with the control electronics in another embodiment,

Fig. 6

another spatial view of the heater Fig. 5 .

Fig. 7

a spatial view of the heater in a further embodiment,

Fig. 8

the view Fig. 7 in another embodiment.

In the Fig. 1-3 a control electronics 1 is shown, which extends in a first direction 2, a second direction 3 and a third direction 4, which are orthogonal to each other and for better illustration in the respective Fig. 1-3 are shown. The control electronics 1 has a printed circuit board 5 with a core 6. The core 6 is made of an electrically conductive metal-containing material, for example of aluminum or copper. The control electronics 1 also has at least one electrical switch 7, wherein the control electronics 1 shown has three such switches 7. The respective switch 7 is designed as a power semiconductor 7 '. The switches 7 are arranged, in particular directly, on the core 6 of the printed circuit board 5. The respective switch 7 has an electrical input terminal 8 via which the switch 7 is electrically supplied. The respective switch 7 also has an output terminal 9, via which at least one heating element 10 of an electric heating device 11 is activated (compare, for example Fig. 6 ). In the exemplary embodiment shown, the respective switch 7 also has a control connection 12 via which the switch 7 is controlled, for example by means of a control device (not shown). The respective output terminal 9 and control terminal 12 each have two pins 13 in the example shown. In this case, the respective connection 8, 9, 12 is electrically isolated from the core 6.

The electrical input terminals 8 of the switches 7 are electrically connected to an input conductor 14, which is arranged between the respective input terminal 8 and the core 6. The output terminals 9 of the switches 7 are each electrically connected to an associated output conductor 15, which is arranged between the associated output terminal 9 and the core 6. In this case, the output conductor tracks 15 are arranged at a distance from one another and are electrically insulated from one another. The control terminals 12 of the respective switch 7 are electrically connected to a respectively associated control track 16, wherein the respective control track 16 between the core 6 and the associated control port 12 is arranged. The control tracks 16 are electrically isolated from each other and from the output tracks 15 and the input track 14. In addition, in particular in the Fig. 1 and 2 to recognize that the output interconnects 15 are spaced from each other and to the control tracks 16 and the input track 14.

The respective conductor track 14, 15, 16 in this case is an electrical conductor for electrically connecting the associated terminal 8, 9, 12. In addition, the respective conductor track 14, 15, 16 on a web-like or ribbon-like shape.

As in Fig. 4 is shown for electrically insulating the respective terminal 8, 9, 12 and the respective conductor track 14, 15, 16 with respect to the electrically conductive core 6 between the respective conductor track 14, 15, 16, and the core 6, an electrically insulating layer 17 is arranged which also attaches the respective conductor track 14, 15, 16 to the core 6. The electrically insulating layer 17 in this case has thermally conductive constituents and is in particular realized as heat-conducting paste 18 or has such a thermal paste 18.

The core 6 is made by cutting and forming a flat plate and has a switch portion 19, a projecting from the switch portion 19 and thus inclined to the switch portion 19 extending supply portion 20 and on the opposite side of the supply portion 20 of the switch portion 19 in the supply portion 20 opposite direction from the switch portion 19 projecting connection portion 21. The respective switch 7 is arranged on the switch section 19 of the core 6. The same applies to the terminals 8, 9, 12 of the respective switch 7, which are likewise arranged on the switch section 19. In this case, the respective switch 7 has a switch housing 22, which rests flat on the core 6 in the switch section 19. By using the core 6 of a metallic material, there is an improved heat exchange between the respective switch 7 and the core 6. As a result, there is an improved cooling of the respective switch. 7

In the example shown, the input interconnect 14 extends over the entire side of the supply section 20 facing the switches 7. In addition, the input interconnect 14 extends into the switch section 19 to the input connections 8 of the switches 7. The respective output interconnect 15 extends between the associated output terminal 9 in the switch section 19 and a first connection region 23 in the connection section 21, wherein the first connection regions 23 along the third direction 4 spaced from each other are. The core also has second connection regions 24 in the connection section 21, which are arranged in the third direction 4 between adjacent second connection regions 23 and spaced therefrom. The connection regions 23, 24 are in the same direction from the switch section 19. The core also has third connection regions 25 arranged between adjacent first connection regions 23 and second connection regions 24 and in opposite directions to the first connection regions 23 and second connection regions 24 and thus projecting from the switch section 19 parallel to the supply section 20. In this case, the respective control interconnect 16 extends between the associated control connection 12 and such an associated third connection region 25. The electrical connection to the respective control connection 12 can thus take place via the third connection region 25.

From the Fig. 1-3 It is also apparent that the core 6 is exposed on the side away from the printed conductors 14, 15, 16 and in the second connecting regions 24.

In Fig. 5 the heater 11 is shown with the control electronics 1. The electric heater 11 is, for example, an auxiliary heater 11 'of an otherwise not shown motor vehicle. When in Fig. 5 shown embodiment of the control electronics 1, a first supply terminal 26 is provided in the supply section 20, which is electrically connected via a supply connection 27 to the input conductor 14. Via the first supply connection 26, the input conductor 14 is electrically connected to a first potential of an energy source, not shown, for example, a rechargeable battery. In particular, the input track 14 may be connected to a positive pole of the electrical source. Thus, the respective switch 7 is connected to the first potential, in particular the positive pole of the electrical source.

Accordingly, the respective switch 7 delivers corresponding potentials via the output terminal 9 to the respectively associated output conductor track 15.

A second supply connection 28 is electrically connected to the core 6 via a second supply connection 29 on the side of the supply section 20 facing away from the input conductor 14. The core 6 is connected via the second supply connection 28 to a second electrical potential, in particular to a ground. Thus, the core 6 is grounded.

From the Fig. 5 and 6 shows that the heating elements 10 are electrically contacted via electrically conductive contact plates 30, 31 with the control electronics 1 and is mechanically connected to the control electronics 1. In this case, such a first contact plate 30 is mechanically connected in the first connection region 23 to the first connection region 23 and is electrically connected to such an associated output conductor 23. Such a second contact plate 31 is mechanically and electrically connected to the core 6 in such a second connection region 24. First contact plates 30 and second contact plates 31 alternate in the third direction 4, wherein between adjacent contact plates 30, 31, the heating elements 10 are arranged, which lie on the associated second contact plate 31 to ground and via the associated first contact plate 30 via the associated output Conductor 23 are connected to the output terminal 9 of the associated switch 7 and thus controlled by the associated switch 7. The respective contact plate 30, 31 in this case has a protruding, parallel to the associated connection region 23, 24 extending arm 32 which bears flat against the associated connection region 23, 24. The connection between the contact plates 30, 31 and en connecting portions 23, 24 takes place via said arms 32, wherein the arms 32 via the connecting portions 23, 24 attached to the core 6, in particular glued, are. The arms 32 are in Fig. 5 for better understanding, spaced apart from the associated connection regions 23, 24.

The respective contact plate 30, 31 has a U-shaped course, wherein between legs of the respective contact plate 30, 31 are arranged through flow-through heat conduction 33.

The heating elements 10 can be configured as desired. The respective heating element 10 may be formed as a PTC thermistor 10 ', in particular as a PTC element 10 ". The heating elements 10 are clamped between the adjacent contact sheets 30, 31.

The heating elements 10 and the heat-conducting ribs 33 are arranged in a flow space 34 of the heating device 11, which can be flowed through by a fluid to be heated, in particular by a gas to be heated, for example by air. The fluid to be heated flows through the heat-conducting fins 33, which are in heat-exchanging contact with the heating elements 10, and past the heating elements 10. As a result, the fluid is heated.

In the Fig. 5 and 6 It can be seen that the first connection region 23 and the second connection region 24 and the side of the switch section 19 facing away from the switches 7 are exposed to the flow of the fluid to be heated. This results in an improved heat exchange between the fluid and the core 6 and thus to an improved heat exchange between the core 6 and the switches 7. As a result, there is an improved cooling of the switch. 7

In Fig. 7 is a further embodiment of the control electronics 1 shown in such a heater 11. Compared to that in the Fig. 5 and 6 illustrated embodiment, the control electronics 1, an electronics box 35 and an electronics housing 35, which has an interior space 36. The electronics box 35 also has an open towards the flow space 34 Opening 37, which is completely closed by the core 6, such that the flow space 34 is fluidly separated from the interior 36. The electronics box 35 is made of an electrically insulating material, for example of plastic. The circuit board 5 is arranged such that the supply portion 20 and the third connection portions 25 protrude into the inner space 36, while the first connection portions 23 and the second connection portions 24 protrude into the flow space 34. Accordingly, the first connection regions 23, the second connection regions 24 and the side of the switch section 19 of the core 6 facing away from the switches 7 are in direct contact with the fluid flowing through the flow chamber 34. As a result, the heat exchange between the core 6 and the fluid and thus between the core 6 and the switches is increased and thus the cooling of the switch 7 is improved.

In Fig. 8 another embodiment is shown, which differs from the in Fig. 7 shown embodiment in particular differs in that the flow space 34 facing side of the switch portion 19 is provided with protruding from the switch portion 19 cooling elements 38. The cooling elements 38 lead to an increased heat exchange between the fluid and the core 6 and thus to an improved cooling of the switch 7 Fig. 8 the electronics box 35 is not shown.

Claims (15)

1. Control electronics (1) for activating an electric heating element (10) of an electric heating device (11), in particular an auxiliary heater (11') of a motor vehicle,

   - with a printed circuit board (5) comprising an electrically conductive core (6) made from a material containing metal,

   - with an electric switch (7) for activating the heating element (10), which is arranged on the core (6),

   characterised in that

   - the switch (7) comprises an electric output terminal (9) for electrical connection to the heating element (10), which is electrically insulated from the core (6),

   - the switch (7) comprises an electric input terminal (8), which is electrically insulated from the core (6).
2. Control electronics according to claim 1,
   characterised in that
   the electric input terminal (8) is electrically connected to an input printed circuit board track (14), which is arranged between the input terminal (8) and the core (6), wherein an electrically insulating layer (17) is provided between the input printed circuit board track (14) and the core (6).
3. Control electronics according to claim 2,
   characterised in that
   the input printed circuit board track (14) runs between the input terminal (8) and a first supply connection (27) for electrical connection to a first electric potential.
4. Control electronics according to any one of claims 1 to 3,
   characterised in that
   the output terminal (9) is electrically connected to an output printed circuit board track (15), which is arranged between the output terminal (9) and the core (6), wherein an electrically insulating layer (17) is provided between the output printed circuit board track (15) and the core (6).
5. Control electronics according to claim 4,
   characterised in that
   the output printed circuit board track (15) runs between the output terminal (9) and a first connecting region (23) of the core (6) for electrical connection to the heating element (10).
6. Control electronics according to any one of claims 1 to 5,
   characterised in that
   the switch (7) has an electric control connection (12) for controlling the switch (7), which is electrically connected to a control printed circuit board track (16), which is arranged between the control connection (12) and the core (6), wherein an electrically insulating layer (17) is provided between the control printed circuit board track (16) and the core (6).
7. Control electronics according to any one of claims 2 to 6,
   characterised in that
   at least one such electrically insulating layer (17) comprises heat-conducting components.
8. Control electronics according to any one of claims 1 to 7,
   characterised in that
   the core (6) can be connected to a second electric potential via a second supply connection (29) and has a second connecting region (24) for electrical connection to the heating element (10).
9. Control electronics according to any one of claims 1 to 8,
   characterised in that

   - the core (6) comprises a switch portion (19) on which the switch (7) is arranged,

   - the core (6) comprises a terminal portion (21) inclined relative to the switch portion (19),

   the core (6) comprises a supply portion (20) at a distance from the terminal portion (21) and inclined relative to the switch portion (19).
10. Control electronics according to claim 9 and any one of claims 2 to 8,
    characterised in that
    at least one such connecting region (23, 24, 25) is arranged in the terminal portion (21).
11. Control electronics according to any one of claims 3 to 8 and 9 or 10,
    characterised in that
    at least one such supply connection (27, 29) is arranged in the supply portion (20).
12. Control electronics according to any one of claims 9 to 11,
    characterised in that

    - the control electronics (1) comprise an electronics box (35) with an interior compartment (36),

    - the electronics box (35) comprises an open aperture (37),

    - the core (6) closes the aperture (37) and the switch is arranged in the interior compartment (36),

    - the terminal portion (21) protrudes facing away from the interior compartment (36) at least partially.
13. Control electronics according to any one of claims 1 to 12,
    characterised in that
    the switch (7) comprises a switch housing (22) which rests flat on the core (6).
14. Electric heating device (11), in particular auxiliary heater (11') of a motor vehicle,

    - with a flow-through flow chamber (34) for a gas to be heated,

    - with an electric heating element (10) arranged in the flow chamber (34),

    - with control electronics (1) according to any one of claims 1 to 13 for activating the heating element (10).
15. Heating device according to claim 14,
    characterised in that
    the heating element (10) is in electrical contact with the output printed circuit board track (15) via a first contact plate (30), and/or is in electrical contact with the core (6) via a second contact plate (31).

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