DE102017202597A1 - Control electronics with a magnetic flux guide element - Google Patents

Abstract

The invention relates to control electronics (1) for controlling a load (5) in a vehicle, comprising a printed circuit board (20) and a rod core choke (10), the rod core choke (10) having a rod core (12) and an electrical conductor (14). having, wound around the rod core (12) forms a winding, wherein the circuit board (20) has a recess (24). It is proposed that within the recess (24) the rod core choke (10) is at least partially disposed, wherein on the Stabkerndrossel (10) a magnetic flux guide element (50a, 50b, 50c) is arranged, which by the rod core choke (10) generated magnetic Flow leads, and which is at least partially disposed within the recess (24).

Description

The invention relates to an electronic control system for controlling a consumer in a vehicle with a printed circuit board, a rod core choke and a magnetic flux guide element. The invention also relates to a method for producing the control electronics.

State of the art

It is known for caching of energy, for impedance matching or filtering to use a throttle. Also, various types of chokes with different properties are known. The rod core choke is a very cost-effective throttle, but must be contacted very expensive electrically and mechanically. Rod core chokes, for example, welded to a substrate or held by push-through mounting on a support. There are thus more components or intermediate steps in the production necessary, which lead to an increase in costs.

Disclosure of the invention

An advantage of the control electronics according to the invention is that the control electronics has a magnetic flux guide element, which can be easily arranged on a printed circuit board or a rod core choke. The magnetic flux guide element is designed to receive and guide the magnetic flux generated by the rod core choke. An advantageous reduction of stray fields is achieved. Depending on the design of the magnetic guide element, a large number of limit values for magnetic field emission can be met without requiring several variations of the printed circuit board or variations of the electrical components. It is advantageous that the magnetic flux guide element causes a reduction of the radiated magnetic field emission after being arranged on the printed circuit board or on the rod core choke. Further, the magnetic flux guide reduces the magnetic field emission without an increase in the filter damping, which can be achieved for example by increasing the rod core choke. Furthermore, no closed core corresponding to a storage throttle is necessary.

The measures listed in the dependent claims, advantageous refinements and improvements of the main claim features.

It is particularly advantageous that the rod core choke protrudes through the recess or the characteristic in the printed circuit board. The recess is preferably formed continuously. The rod core choke is arranged within the recess, or introduced so that it protrudes at least partially on both sides of the circuit board, in particular in the direction perpendicular to the surface of the circuit board, out of the circuit board out.

It is advantageous that the electrical conductor of the rod core choke has at least two connection regions, wherein each connection region has at least one connection surface. The pads allow an electrical and mechanical connection, in particular by means of soldering, of the electrical conductor to the printed circuit board.

It is particularly advantageous that the magnetic flux guide element is U-shaped, L-shaped or I-shaped.

It is advantageous that the magnetic flux guide element has a base element. The base element extends in particular parallel to the longitudinal direction of the rod core choke, in particular to the rod core of the rod core choke. There is an advantageous leadership of the magnetic flux.

It is advantageous that the magnetic flux guide element has at least one leg. The at least one leg extends at least starting from the base element to an end face of the rod core. Optimal absorption and / or delivery of the magnetic flux through the magnetic flux guide element is given.

It is considered to be advantageous that the recess is open to the edge of the circuit board. It is a simple assembly allows, for example, a sliding of the rod core choke and / or the magnetic flux guide element, in particular parallel to the surface of the circuit board allowed.

Furthermore, it is advantageous that the magnetic flux guide element extends on both sides of the printed circuit board. The magnetic flux guide element extends over a larger area, in particular the entire longitudinal side, of the rod core, as a result of which the magnetic flux guide element can better absorb and release the magnetic flux from the rod core.

It is particularly advantageous that a leg and / or the base element, a particular continuous, has groove. The groove runs parallel to the surface of the circuit board. The circuit board is at least partially, in particular after assembly, disposed within the groove. It is possible to guide the magnetic flux guide element when pushed onto the printed circuit board. The printed circuit board guides the magnetic flux guide element by means of the groove. Furthermore, the range of motion of the Limited magnetic flux guide element relative to the circuit board.

Advantageously, the magnetic flux guide element has a maximum extent perpendicular to the surface of the printed circuit board, which corresponds to the expansion of the rod core choke in the same direction. As a result, the magnetic flux can be recorded, guided and released as best as possible.

It is advantageous that between at least one of the end faces of the rod core choke and the magnetic flux guide element, an air gap is formed. Advantageously, the variation of the air gap at the end allows adaptation of the magnetic field emission.

It is advantageous that the control electronics has a housing element. The housing element has a U-shaped cross-section. The housing element is arranged rotated by 90 degrees relative to the magnetic flux guide element on the magnetic flux guide element. The housing element covers the rod core choke perpendicular to the surface of the circuit board on at least one side of the circuit board. The magnetic field emission is reduced and / or the rod core choke protected against damage.

It is considered to be advantageous that the magnetic flux guide element is fixed by means of a heat conducting element, in particular thermal paste on the circuit board and / or the rod core choke. A simple assembly is given.

Furthermore, the invention relates to a method for producing an inventive control electronics. An advantage of the method according to the invention is that the control electronics can be easily and inexpensively produced by pushing the magnetic flux guide element.

Furthermore, it is advantageous that the housing element can be easily arranged by sliding on the magnetic flux guide element.

It is advantageous that the attachment of the magnetic flux guide element is effected by means of the heat-conducting element. The heat-conducting element also dissipates the heat from the rod core choke.

• 1 ein Blockschaltbild einer erfindungsgemäßen Steuerelektronik,
• 2 einen Ausschnitt der Steuerelektronik,
• 3 eine Seitenansicht des in 2 gezeigten Ausschnitts der Steuerelektronik,
• 4 eine Stirnansicht des in 2 gezeigten Ausschnitts der Steuerelektronik,
• 5 eine erste Ausführungsform mit einem I-förmigen Magnetflussführungselement,
• 6 eine zweite Ausführungsform mit einem L-förmigen Magnetflussführungselement,
• 7 eine dritte Ausführungsform mit einem U-förmigen Magnetflussführungselement,
• 8 eine Seitenansicht des montierten Magnetflussführungselements an der Leiterplatte und 9 ein Blockschaltbild des Verfahrens.

Embodiments and the method sequence are illustrated in the figures and explained in more detail in the following description. Show it:

• 1 a block diagram of an inventive control electronics,
• 2 a section of the control electronics,
• 3 a side view of the in 2 shown section of the control electronics,
• 4 an end view of the in 2 shown section of the control electronics,
• 5 a first embodiment with an I-shaped magnetic flux guide element,
• 6 a second embodiment with an L-shaped magnetic flux guide element,
• 7 a third embodiment with a U-shaped magnetic flux guide element,
• 8th a side view of the mounted magnetic flux guide element on the circuit board and 9 a block diagram of the method.

This in 1 illustrated block diagram shows an inventive control electronics 1 for controlling and / or regulating a consumer 5 , The control electronics 1 is used in particular in a vehicle for driving and / or regulating a motor, preferably a small motor, such as a pump motor, a fan motor, a steering drive motor, a windscreen wiper motor, an engine for adjusting seats, a sunroof engine, a motor for adjusting the boot lid. Under control electronics is also a control, control, electronics or regulation understood.

The control electronics 1 has a coil, which forms in particular a throttle. The throttle is as a bar core choke 10 educated. Preferably, the rod core choke acts 10 as input filter.

Furthermore, the control electronics 1 a circuit board 20 on. The circuit board 20 is a carrier for electronic components, such as the rod core choke 10 , Circuit breakers, capacitors and / or resistors. The circuit board 20 is used for mechanical attachment and electrical connection of the electronic components, such as the rod core choke 10 , The circuit board 20 includes an electrically insulating material and conductive traces extending on or in the electrically insulating material. Furthermore, the circuit board 20 solder pads 22 on, which are formed on the surface of the circuit board. The solder pads 22 serve the electrical and mechanical connection of electronic components 10 with the circuit board 20 , The solder pads are part of the tracks. The conductor tracks serve to establish an electrical connection between the rod core choke 10 and other electrical components.

In 2 is a section of the control electronics 1 shown in perspective. 2 shows the rod core choke 10 and part of the circuit board 20 , The circuit board 20 has a recess 24 on. The recess 24 is exemplary throughout the circuit board 20 educated. Under the recess 24 can also be a recess, a hole, an opening to be understood, as long as these, in particular completely, by cross-cutting, or continuously through the circuit board 20 runs. The recess 24 is to the edge of the circuit board 20 open. The recess 24 is open in the circumferential direction and not completely from the circuit board 20 surround. The recess 24 can be produced in particular by means of a stamping process or by means of a milling process. Also, the recess already in the production of the circuit board 20 be omitted.

According to one embodiment of the invention, the recess is only a depression. Such a configuration is particularly useful if the circuit board 20 in relation to the rod core choke 10 is very thick. In particular, when the radius of the rod core choke 10 smaller than the thickness of the circuit board 20 is.

Inside the recess 24 is the rod core choke 10 arranged. The rod core choke 10 protrudes on both sides of the circuit board out of the recess. The rod core choke 10 protrudes in particular between 30 to 70% of the diameter of the rod core choke 10 on each side of the circuit board 20 from the recess 24 out.

The rod core choke 10 has a rod core 12 and an electrical conductor 14 on. The rod core 12 comprises a ferrite material and / or a ferromagnetic material. In particular, the bar core is 12 made of, in particular laminated, metal sheets with a thickness of for example 100 microns, a solid metal core or a powder core together. The sheets are in particular punched Trafo sheets or rapidly solidified metal strips. The rod core 12 comprises or consists of a ferrite material, such as MnZn, NiZn, Fe, Co and Ni based soft magnetic alloys. Ferromagnetic materials in polymers are also used as rod core 12 possible.

Around the bar core 12 is the electrical conductor 14 wound, which forms a winding, in particular a coil. The rod core choke 10 forms a coil, or an inductance for limiting currents in electrical lines, for intermediate storage of energy in the form of a magnetic field, for impedance matching or for filtering.

The electrical conductor 14 has in particular a circular cross-section. The diameter of the electrical conductor is in particular at least 1.3 mm, preferably at least 2.2 mm or 2.24 mm.

Furthermore, the electrical conductor 14 at least two connection areas 16 on. The connection areas 16 serve the electrical contacting of the electrical conductor 14 with the solder pads 22 the circuit board 20 ,

According to 2 each has connection areas 16 two diametrically opposite bonding surfaces. The connecting surface, which is in the direction of the printed circuit board 20 shows, as a connection surface 15a . 15b referred to as. The other interface shows from the PCB 20 path. This allows the rod core choke 10 from both sides into the recess 24 introduced and with the circuit board 20 get connected. Exemplary is in 2 the rod core choke 10 inserted from above into the recess and accordingly also at the top of the circuit board 20 electrically connected to this. The following are called pads 15a and 15b denotes the connecting surfaces, which after mounting in contact with the circuit board 20 stand.

According to one embodiment of the invention, each has connection areas 16a and 16b only one connector on which the pad 15a and 15b forms.

The electrical conductor 14 points in the connection areas 16a and 16b one opposite the remaining electrical conductor 14 deviating cross-section on. In particular, the cross section of the electrical conductor 14 in the connection areas 16a and 16b at least one straight area leading to a flat connection surface 15 leads. The connection surfaces 15 allow an electrical connection of the circuit board 20 with the rod core choke 10 , The electrical connection is made in particular by means of soldering.

Preferably, the two pads are 15 in a first imaginary level 40 , The normal vectors of the pads 15a and 15b pointing in the same direction, especially in the direction of the circuit board 20 , The connection areas 16 in particular through the ends of the electrical conductors 14 educated. The ends are parallel to the axial axis of the rod core 12 ,

In 3 is the side view of the section of the control electronics 1 out 2 shown. Is exemplary in the 3 shown that the rod core choke 10 with about 30% on the connection areas 16a and 16b opposite side of the circuit board 20 protrudes. The larger portion of the rod core choke 10 protrudes on the side of the circuit board 20 from the recess 24 on which also the connection areas 15a and 15b lie.

Further shows 3 that the connection surfaces 15 in the first imaginary level 40 lie. A second level 45 extends parallel to the first level 40. The second level 45 is through the radially centered longitudinal axis of the rod core 12 and by the radially centered longitudinal axis of the electrical conductor 14, in one of the terminal region 16 , stretched. Preferably, the second level 45 through the radially centered longitudinal axes of the electrical conductors 14 in both connection areas 16 and the radially centered longitudinal axis of the rod core 12 educated. As a centered longitudinal axis is referred to a cross-section through the center extending longitudinal axis. The second level 45 divides the bar core 12 in two, in particular substantially equal, segments, in particular in cross section considered in two equal-sized semicircular segments.

The second level 45 forms the mirror plane of the rod core 12 ,

The second level 45 and the first level 40 have a distance. The distance corresponds essentially to the radius of the electrical conductor 14 in the connection areas 16 , Preferably, the distance additionally comprises the thickness of the solder between the printed circuit board and the electrical conductor 14 ,

4 shows the in the recess 24 rod core choke 10 from the front of the rod core choke 10 , The rod core 12 has a circular cross section with a center viewed from the front side. The rod core 12 is wrapped by the electrical conductor 14 ,

The first level 40 extends parallel across the surface of the circuit board 20 , or has a minimum distance, which corresponds in particular to the thickness of the solder on. The first level 40 divides the circular bar core 12 and thus the rod core choke 10 into two segments, in particular two circle segments. The first circle segment has a circle segment height h1, which is smaller than the circle segment height h2 of the second circle segment. Furthermore, the circle segment height h1 is smaller than the radius R of the rod core 12 , The first circle segment is located partly within the recess 24 , Another part protrudes on the connecting surfaces 15 of the electrical conductor 14 opposite side of the circuit board 20 from the recess 24 out.

Viewed in cross section, an imaginary straight line passes through the center of the rod core 12 and the center of the electrical conductor 14 in the connection area 16 parallel to the surface of the circuit board 20 , The straight line is part of the second level 45 , The connection areas 16 of the electrical conductor 14, or the ends of the electrical conductor 14 run parallel to the axial direction of the rod core 14 , The connection areas 16 lie according to 4 and 3 next to the rod core 12 the rod core choke 10 ,

According to a development, the circle segment height h1 is greater than the circle segment height h2 and / or the radius R of the rod core 12 ,

According to one embodiment of the invention, the circle segments, starting from the first level 40 , the same size. Preferably, the circle segments may be outgoing from the first level 40 conditions 4 / 7 to 3 / 7 exhibit. In particular, other ratios such as 2/3 to 1/3 or ¾ to 1/4 are possible.

The 5 to 7 show a section of the control electronics 1 with a magnetic flux guide element according to the invention. The magnetic flux guide element is designed to be that of the rod core choke 10 generated magnetic flux leads. The magnetic flux guide element has a permeability greater than 1, preferably greater than 100. In particular, the magnetic flux guide element is composed of, in particular laminated, metal sheets with thicknesses of, for example, 100 μm, a solid metal core or a powder core. The sheets are in particular punched Trafo sheets or rapidly solidified metal strips. The magnetic flux guide member comprises or consists of a ferrite material such as MnZn, NiZn, Fe, Co and Ni based soft magnetic alloys. Also, ferromagnetic materials in polymers are possible as a magnetic flux guide element.

The arrow 70 shows the mounting direction 70 , According to the mounting direction 70 the magnetic flux guide element is pushed onto the circuit board, or on the circuit board 20 or the rod core choke 10 arranged.

5 shows a first embodiment of the control electronics 1 with a magnetic flux guide element 50a , The magnetic flux guide element 50a is I-shaped. The magnetic flux guide element 50a has a base member 52. The basic element 52 is adjacent to the rod core choke 12 arranged. The basic element 52 extends at least over the length of the rod core 12 longitudinal. Preferably, the base member extends 52 over the length of the rod core 12 out. The basic element 52 extends parallel to the surface of the circuit board 20 , The magnetic flux guide element 50a, in particular the base element 52 , has at least one groove 60 on. In particular, the magnetic flux guide element 50a on each of the two end faces a groove 60 on.

The groove 60 runs parallel to the printed circuit board 20 , The groove 60 has at least the thickness of the circuit board 20 on. Advantageously, the groove has the thickness of the printed circuit board 20 and the electrical conductor 14 in the connection area 16 on.

6 shows a second embodiment of the control electronics 1 with a magnetic flux guide element 50b , The magnetic flux guide element 50b is L-shaped. The magnetic flux guide element 50b points next to the base element 52 according to the I-shaped magnetic flux guide element 50b according to 5 a thigh 54 on. The thigh 54 extends from the base member 52 in the direction of the rod core choke 10 , The magnetic flux guide element 50b extends parallel to the surface of the circuit board 20 , The thigh 54 extends from the base element 52 to the front of the rod core 12 , The thigh 54 can according to an embodiment of the invention also on the front side of the rod core 12 , even the rod core choke 10 extend beyond. Preferably, the leg 54 and the base element 52 arranged at right angles to each other. Further, the base element 52 and the thigh 54 firmly connected to each other, in particular formed in one piece. The magnetic flux guide element 50b has at least one groove 60 on. The magnetic flux guide element 50b , in particular the base element 52 and the thigh 54 , have at least one groove 60 on. The groove 60 sits down from the groove 61 of the base element 52 and the groove 62 of the thigh 54 together. At the opposite end of the magnetic flux guide element 50b is also a groove 60 formed, but only on the base element 52 extends. In particular, the magnetic flux guide element 50b on each of the two end faces a groove 60 on. Preferably, the groove extends 60 parallel to the mounting direction over the entire length of the magnetic flux guide element 50b ,

7 shows a third embodiment of the control electronics 1 with a magnetic flux guide element 50c , The magnetic flux guide element 50c is U-shaped. The magnetic flux guide element 50c points next to the base element 52 and the first leg 54 corresponding to the L-shaped magnetic flux guide element 50b according to 6 a second leg 56 on. The second leg 56 is parallel to the first leg 54 educated. The thigh 56 extends from the base element 52 up to the front side, the front side up to which the first leg 54 extends, lies opposite. The basic element 52 has a minimum length, the length of the rod core 12 plus the thickness of the first leg 54 and the second leg 56 plus the air gaps between bar core 12 and legs 54, 56 corresponds. Preferably, the leg 54 , the thigh 56 and the base element 52 arranged at right angles to each other. Further, the base element 52 , the first leg 54 and the second leg 56 firmly connected to each other, in particular formed in one piece. The magnetic flux guide element 50c has at least one groove 60 on. The magnetic flux guide element 50c , in particular the base element 52 and the thigh 54 , have a groove 60 on. The groove 60 sits down from the groove 61 of the base element 52 and the groove 62 of the thigh 54 together. Another groove 60 is formed on the opposite end face of the magnetic flux guide member 50c. The groove 60 on the opposite side is made up of a groove 61 of the base element 52 and the groove 62 of the thigh 56 together. The groove 60 of the base element 52 goes into the groove 62 of the thigh 54 above. The groove 61 of the base element 52 goes into the groove 62 of the thigh 54 , respectively. 56 above.

In particular, the magnetic flux guide element 50c on each of the two end faces a groove 60 on.

8th shows the side view of an electronic control system 1 with a magnetic flux guide element according to one of the embodiments 2 to 3 , It is in particular the basic element 52 and the thigh 54 according to the embodiments 2 and 3 shown. The thigh 56 is hidden. The magnetic flux guide member according to the embodiment 1 has no thighs 54 on.

In 8th is a part of the base element 52 and a thigh 54 of the magnetic flux guide element shown. The thigh 54 includes two parts that pass through a groove 62 are separated. The groove 62 is a completely continuous groove.

According to a development, the groove 62 not completely trained. The groove 60 gets through the grooves 61 and 62 educated. The groove 60 , 62 has a smaller depth than the thickness of the legs 54 . 56 on.

The height HN of the groove 60 corresponds to the thickness of the printed circuit board 20 , Preferably, the height HN corresponds to the groove 60 the thickness of the circuit board 20 and the thickness of the electrical conductor 14 , in particular at the connection areas 16 , Preferably, the height HN is greater than the thickness of the printed circuit board 20 , The circuit board 20 forms a spring which, in the groove 60 is introduced. The grooves 60 formed to the outside. The grooves 60 run parallel to each other.

The thigh 54 . 56 has a leg length SL. The thigh 54 extends from the base element 52 beyond the cross-section of the center of the rod core 12 , According to a development of the embodiment extends the thigh 54 over the entire rod core 12 , preferably beyond the bar core.

If the magnetic flux guide element is U-shaped, the leg lengths SL of both legs are preferably 54 . 56 of equal length.

The magnetic flux guide member extends over both sides of the circuit board 20 , A connecting element 59 is part of the base element 52 , It connects the two parts of the base element 52 on each side of the circuit board 20 are formed. The connecting element 59 is the part of the base member of the, in particular after assembly, in the recess 24 is arranged.

In particular, the magnetic flux guide element has a height H which corresponds to the diameter of the rod core choke 10 equivalent. Preferably, the height H can also correspond to the bar core. Preferably, the height of the magnetic flux guide element 6 up to 20mm, especially 6.5 to 13 mm.

The thickness of the magnetic flux guide element is dependent on the leading to magnetic flux and thus dependent on the rod core choke 10 and its field of application. Advantageously, a cross section is smaller than / equal to that of the rod core 12 the rod core choke 10 , A thickness of 2 to 7 mm, in particular 3 to 5.7 mm, is advantageous.

Between the end faces of the rod core choke 10 and the magnetic flux guide element are formed air gaps. Preferably, additional air gaps are between the electrical conductors 14 and the magnetic flux guide element is formed. The length L of the base element 52 corresponds to the length L of the magnetic flux guide element plus the thickness of the air gaps between the magnetic flux guide element and the end face of the rod core choke 10 ,

An example is a housing element 80 in 8th shown. The housing element 80 is part of the housing, which the control electronics 1 at least partially surrounds.

The magnetic flux guide element has raster elements. The locking elements are provided for attachment of the magnetic flux guide element to the circuit board 20 to enable. The locking elements engage in correspondingly formed holding elements which are formed in the printed circuit board or arranged on the printed circuit board, a. According to one embodiment of the invention, the magnetic flux guide element can also be soldered to the printed circuit board 20, clipped, glued, screwed, riveted, etc.

According to one embodiment of the invention, the magnetic flux guide element by means of a heat conducting element 100 , in particular thermal compound (TIM) on the circuit board 20 and / or the rod core choke 10 and / or the housing member 80 is attached. The heat-conducting element 100 is in the space between the magnetic flux guide member and the rod core choke 10 educated. It transports the heat from the rod core choke 10 path.

According to a development, the space between the housing element 80 , the rod core choke 10 and the magnetic flux guide member with the heat conduction member 100 at least partially filled.

According to a further development of the embodiments, the magnetic field guiding elements have indentations, recesses, roundings or bends.

9 shows the procedure of the method according to the invention for the production of control electronics 1 ,

The procedure 200 includes arranging 210 the rod core choke 10 inside the recess 24 , The rod core choke 10 becomes perpendicular to the surface in the recess 24 inserted. Optionally, the rod core choke 10 aligned so that the symmetrically in the recess 24 lies. The rod core choke 10 can also be parallel to surface in the recess 24 be inserted. The rod core choke 10 will be according to the arrow 70 , in particular in the mounting direction, in the recess 24 introduced. The connection surfaces 15 be opposite the circuit board 20 aligned.

In the process step 230 the magnetic flux guide element is pushed. This is where the circuit board engages 20 in the groove 60 . 62 one. The circuit board 20 guides the magnetic flux guide element. The circuit board 20 becomes a small part of the groove 60 of the magnetic flux guide element introduced.

In an optional process step 240 becomes the heat element 100 appropriate. In particular, the area between the magnetic flux guide element and rod core choke becomes 10 filled with the heat element 100. Preferably, the heat element is formed as a liquid, in particular as a paste. The paste creates a mechanical connection. In particular, it acts like an adhesive. It adheres the magnetic flux guide element to the circuit board 20 and the rod core choke 10 , step 240 can also before process step 230 be performed

It is generally postponed to attach the magnetic flux guide element to the printed circuit board 20 by means of pushing, in particular guiding, gliding, pushing, pushing, moving, understanding. The magnetic flux guide element is moved in the mounting direction. In this case, the circuit board engages according to a tongue and groove connection in the groove 60 of the magnetic flux guide element. The magnetic flux guide element is moved in the mounting direction, in particular pushed, preferably on the circuit board 20 postponed.

Claims (10)

Control electronics (1) for controlling a load (5) in a vehicle, in particular an electric motor, comprising a printed circuit board (20) and a rod core choke (10), the rod core choke (10) comprising a rod core (12) and an electrical conductor (14 ), which forms a winding around the rod core (12), wherein the printed circuit board (20) has a recess (24) characterized in that inside the recess (24) the rod core choke (10) is arranged at least partially, wherein at Rod core choke (10) a magnetic flux guide element (50a, 50b, 50c) is arranged, which guides the magnetic flux generated by the rod core choke (10), and which is at least partially disposed within the recess (24). Control electronics (1) according to the preceding claim, characterized in that the magnetic flux guide element (50a, 50b, 50c) has a base element (52) which extends parallel to the longitudinal direction of the rod core choke (12). Control electronics (1) according to the preceding claim, characterized in that the magnetic flux guide element (50a, 50b, 50c) has at least one limb (54, 56) extending at least as far as an end face of the rod core (12) starting from the base element (52 ). Control electronics (1) according to one of the preceding claims, characterized in that the recess (24) to the edge of the printed circuit board (20) is open. Control electronics (1) according to one of the preceding claims, characterized in that the magnetic flux guide element (50a, 50b, 50c) extends on both sides of the printed circuit board (20). Control electronics (1) according to one of the preceding claims, characterized in that at least one of the legs (54, 56) and / or the base element (52), in particular a continuous, groove (60, 61, 62), wherein the groove ( 60, 61, 62) runs parallel to the surface of the printed circuit board (20) and the printed circuit board (20) is at least partially disposed within the groove (60, 61, 62). Control electronics (1) according to one of the preceding claims, characterized in that the magnetic flux guide element (50a, 50b, 50c) has a maximum extent perpendicular to the surface of the printed circuit board (20), in particular in the region of the legs (54, 56) Extension of the rod core choke (10) perpendicular to the surface of the circuit board (20) corresponds. Control electronics (1) according to one of the preceding claims, characterized in that the magnetic flux guide element (50a, 50b, 50c) by means of a heat-conducting element (100), in particular thermal paste on the circuit board and / or the rod core choke is attached. Method (200) for producing an electronic control unit (1) according to one of the preceding claims, comprising the steps of the rod core choke (10) at least partially disposed within the recess (24), and that the rod core choke (10) mechanically and / or electrically is connected to the circuit board (20), characterized in that the magnetic flux guide element (50a, 50b, 50c) from the outside, in particular along the recess (24) by means of sliding (210) on the rod core choke (50a, 50b, 50c) is arranged , Method (200) according to the preceding claim, characterized in that a heat-conducting element (100), in particular a thermal paste, is attached to the rod core choke and / or the printed circuit board.

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