EP3987557A1

EP3987557A1 - Inductive component

Info

Publication number: EP3987557A1
Application number: EP20733954.0A
Authority: EP
Inventors: Johannes Hofbauer; Rainer Pilsl
Original assignee: Sumida Components and Modules GmbH
Current assignee: Sumida Components and Modules GmbH
Priority date: 2019-06-19
Filing date: 2020-06-18
Publication date: 2022-04-27
Also published as: WO2020254480A1; US20220223334A1; DE102019208884A1; JP7320632B2; JP2022537993A; CN113939887A; CN113939887B

Abstract

In one aspect of the invention an inductive component is provided which comprises a magnetic core (10), at least one winding (W), and a coil body (30) wound with the at least one winding (W). The coil body (30) has at least one contact element (50) attached to a contact strip (33) of the coil body (30) for electrical connection to the at least one winding (W), a magnetic core receptacle in which the magnetic core (10) is partially received, and an elongated depression (32) which is formed in the contact strip (33) and extends below the magnetic core (10) received in the magnetic core receptacle (31) and above the at least one contact element (50) and only partially extends in a longitudinal direction of the contact strip (33) along the contact strip (33). The inductive component further comprises a covering cap which is formed from an electrically insulating material and is attached to the contact strip (33) and by which a lateral surface (14) of the magnetic core (10) oriented towards the at least one contact element (50) is at least partially covered with respect to the at least one contact element (50). The covering cap (20) has a first wall portion (22) by which the lateral surface (14) of the magnetic core (10) oriented towards the at least one contact element (50) is at least partially covered by the covering cap (20) with respect to the at least one contact element (50). A second wall portion (23) of the covering cap (20) extending normally to the first lateral surface (14) of the magnetic core (10) is inserted into the depression (32) formed in the coil body (30), the second wall portion (23) extending between the magnetic core (10) and the at least one contact element (50) in the coil body (30).

Description

INDUCTIVE COMPONENT

The present invention relates to an inductive component and in particular to compliance with insulation requirements in the case of very compact inductive components.

Inductive components such as Transformers and chokes are used in a wide variety of applications. An application example for this is electronics in automobiles, in which inductive components, etc. For example, they can be used as ignition transformers for gas discharge lamps or filter chokes. The extensive developments in the automotive sector with regard to automotive electronics led to a sharp increase in the number of electronic components, for example for use in vehicles as instrument clusters that are used to display data in the car, for controlling the engine management system by activating the ignition system or the injection system , in anti-lock and driving dynamics control systems, in the control of airbags, in body control units, in driver assistance systems, in car alarm systems and multimedia devices such as Navigation systems, TV gymnasts, etc.

The number of electronic devices in automobiles, which is increasing with this development, necessitates, for example, further adjustments to the electronic components with regard to their structural size in order to adhere to the installation spaces specified in the automobile by the vehicle design despite the increasingly extensive and complex electronics in automobiles. In general, there are further requirements for the electronics in automobiles in terms of robustness, the temperature range (e.g. ensuring operability in a temperature range from -40 ° C to around 120 ° C), vibration and shock resistance (caused by vibrations in vehicle operation) , etc., whereby the reliability of the electronics should be guaranteed over the longest possible period with regard to the most varied of conditions and states.

In addition to the application-related conditions with regard to a component size, which is particularly aimed at a more compact design of electronic components in order to meet given installation spaces, for example as a predetermined maximum mounting surface that an electronic component on a carrier, such as a printed circuit board, on which the Electronic components are to be attached, at most they are allowed to take, it is imperative to adhere to the general safety standards, without in turn reducing the performance and quality of electronic components. For example be Insulation requirements specified by safety standards for the implementation of uniform minimum safety standards which electronic components should meet, such as compliance with specified air and creepage distances and compliance with a specified dielectric strength.

Here, an air gap is generally understood to mean the shortest distance between two conductive parts, especially the shortest possible connection via air, across recesses and crevices and across insulating attachments that are not fully connected to the subsurface and are free of crevices. The air gap depends, among other things, on the voltages applied, with electronic components being assigned to predetermined overvoltage categories. Both overvoltages that enter the electronic component from outside via connections (e.g. connection terminals of an electronic component) and are generated in the electronic component itself and occur at the connections must be taken into account. Predefined clearances are intended to rule out the possibility of a voltage breakdown through air via the shortest possible connections through air. In this sense, clearances limit the maximum possible electric fields in air so that no breakdown occurs.

In contrast, the creepage distance represents the shortest connection between two potentials over a surface of an insulating material which is arranged between the two potentials. The creepage distance generally depends on the effective operating voltage of an electronic component and is, among other things, influenced by the degree of soiling and / or degree of moisture on a surface of an insulation material. For example, the resistance to creep current of an insulating material is determined by the insulation strength of a surface of the insulating material under the influence of moisture and / or contamination and can be understood as indicating the maximum creepage current that can be set under standardized test conditions in a defined test arrangement. The creepage resistance depends largely on the water absorption capacity and the behavior of an insulating material under thermal stress.

Furthermore, the insulation distance is understood to mean the thickness of an insulation material, so that this variable is important for determining the dielectric strength of an insulation material. By means of safety standards that place requirements on air, creepage and insulation distances, depending on the dimensioning of an electronic component, there are mandatory conditions for sufficient insulation in order to avoid voltage breakdowns (e.g. light bottom or sparks) and / or creepage currents as a potential safety risk. For example, voltage breakdowns as arcs or sparks are to be avoided in the context of explosion protection, while leakage currents represent a safety risk for a user when they come into contact with a leakage current source.

Current approaches to a solution for the provision of compact inductive components propose to implement safety clearances over extended distances on the coil body or to encapsulate windings. However, this leads to the problems of increased space requirements if longer distances are to be provided, and to problems in reflow applications in potted systems.

In view of the above explanations, the object of the invention is to provide inductive components with a compact design for assembly in small installation spaces in compliance with specified safety standards, in particular without falling below specified clearances and / or creepage distances and / or insulation distances.

In a first aspect of the invention, the present invention provides an inductive component, comprising a magnetic core, at least one winding, a bobbin wound with the at least one winding, and a cover cap formed from an electrically insulating material. The bobbin comprises at least one contact element attached to a contact strip of the bobbin for electrical connection to the at least one winding, a magnetic core holder in which the magnetic core is partially accommodated, and an elongated recess formed in the contact strip, which is located under the magnetic core holder recorded magnetic core and only partially extends over the at least one contact element along a longitudinal direction of the contact strip. The cover cap is attached to the contact strip and at least partially covers a side surface of the magnet core that is tailored to the at least one contact element with respect to the at least one contact element, the cover cap having a first wall section through which the cover cap opens the side surface of the at least one contact element Magnetic core with respect to the at least one contact element at least partially covered, and one normal to the first side surface of the magnet core extending second wall portion which is inserted into the recess formed in the coil body. Thus, the second wall section between the magnetic core and the at least one contact element extends in the longitudinal direction only partially along the contact strip. The longitudinal direction of the contact strip is to be understood as a direction in which the contact strip has a largest dimension. An “elongated depression” is also to be understood as a depression, for example a groove or elongated notch, which has a direction of extension transverse to a depth direction (ie a direction along a depth of the depression into the material in which the depression is formed as a recess ), wherein the direction of extent is a direction along which the recess has a largest dimension. Since the recess extends only partially along the longitudinal direction of the contact strip, the recess has only one opening, which is only formed in one side surface of the contact strip. If a plurality of contact elements is provided on the contact strip, a longitudinal direction of the contact strip can additionally or alternatively be understood as a direction along which the plurality of contact elements are arranged along the contact strip.

As a result of the elongated recess in the contact strip, the coil body on the contact strip is designed as a counterpart to the cover cap and a very reliable connection between the cover cap and the coil body is achieved. It is possible because of the cover cap to meet existing requirements for clearances and creepage distances regardless of the dimensions of the inductive component, so that safety standards in this regard are complied with even with compact components with small dimensions.

In the various embodiments of the first aspect of the invention, the coil body on the contact strip is partially designed as a negative shape of the cover cap, which is a simple way in which the coil body and the cover cap are matched to one another. More precisely, the coil body on the contact strip is partially designed as a negative shape of at least one wall section of the cover cap, so that the coil body and the cover cap are simply matched to one another in order to enable a form-fitting connection. In particular, the form-fitting connection between the cover cap and the coil body is ensured in that the recess in the contact strip is designed as a negative shape with respect to the second wall section. In a second embodiment of the first aspect of the invention, the covering cap can furthermore have a third wall section and a fourth wall section, which are oriented perpendicular to the first wall section and the second wall section. The third wall section and the fourth wall section extend parallel to one another and each along an edge of the first wall section. In this embodiment, the third and fourth wall sections further increase the insulation and creepage distances between the magnetic core and the at least one additional contact element.

In a clearer configuration of this second embodiment, the recess in the coil body can be formed from three groove-shaped recess sections, each of which is designed to partially accommodate the second to fourth wall sections. This shape of the recess allows a very reliable plug connection between the cover cap and the coil body.

In a third embodiment of the first aspect of the invention, the first wall section of the cover cap can have at least one web section which extends away from the first wall section along a direction perpendicular to the side surface of the magnetic core towards the magnetic core. For example, the at least one web section can be in physical contact with the magnetic core, a position of the magnetic core in the coil body being fixed by the cover cap and displacement of the magnetic core in the coil body being prevented when the cover cap is attached. In addition, the at least one web section allows a distance between the side surface facing the contact element and the first wall section to be maintained, in particular the magnet core does not slide back in the direction of the first wall section of the cover cap in the coil body. Thus, a desired position of the core in the coil body is determined in a simple manner by means of the cover cap using the at least one web section. In addition, a labyrinth structure is provided by the at least one web section in the side of the first wall section of the cover cap facing the magnet core, which allows an extension of air and creepage distances corresponding to a length of the at least one web section in the direction perpendicular to the side surface of the magnet core.

In an exemplary configuration of this third embodiment, the at least one web section can be spaced apart from the second wall section by an air gap. Thus, the cap can be inserted into the recess until the first section of the wall abuts the contact strip. In a second aspect, the present invention provides an inductive component comprising a magnetic core, at least one winding, and a coil former wound with the at least one winding. The coil body has at least one contact element attached to a contact strip of the coil body for the electrical connection to the at least one winding and a magnetic core receptacle in which the magnetic core is partially received. The inductive component further comprises a cover cap formed from an electrically insulating material, which at least partially covers a side surface of the magnetic core that is facing the at least one contact elements through a first wall section of the cover cap with respect to the at least one contact element, the first wall section of the cover cap at least one web section which extends away from the first wall portion along a direction perpendicular to the side surface of the magnetic core toward the magnetic core. The at least one web section is in physical contact with the magnet core, so that a position of the magnet core in the coil body is determined by the cover cap. This prevents the magnetic core from shifting in the coil body when the cover cap is inserted. Furthermore, the cover cap makes it possible for requirements for air and creepage distances to be complied with regardless of the dimensions of the inductive component, so that safety standards in this regard are adhered to even with compact components with small dimensions. In addition, the at least one web section allows a distance to be maintained between the side surface facing the contact element and the first wall section, in particular the magnetic core does not slide back in the direction of the first wall section of the cover cap in the coil body. The cover cap allows a desired position of the core in the coil body to be determined in a simple manner on the basis of the at least one web section. In addition, a labyrinth structure is provided by the at least one web section in the side of the first wall section of the cover cap facing the magnet core, which allows an extension of air and creepage distances corresponding to a length of the at least one web section in the direction perpendicular to the side surface of the magnet core.

In an advantageous first embodiment of the second aspect, the coil body can have an elongated recess formed in the contact strip, which extends under the magnetic core received in the magnetic core and over the at least one contact element and extends in a longitudinal direction of the contact strip along the contact strip diglich partially extends into the recess a normal to the side surface of the Magnet core extending second wall portion of the cap is inserted. The longitudinal direction of the contact strip here is to be understood as a direction in which the contact strip has a largest dimension. An “elongated recess” is also to be understood as a recess, for example a groove or elongated notch, which has a direction of extension transversely to a depth direction (ie a direction along a depth of the recess into the material in which the recess is a recess is formed), wherein the direction of extent is a direction along which the recess has a largest dimension. Since the recess extends only partially along the longitudinal direction of the contact strip, the recess only has one opening which is only formed in one side surface of the contact strip. If a plurality of contact elements are provided on the contact strip, a longitudinal direction of the contact strip can additionally or alternatively be understood as a direction along which the plurality of contact elements are arranged along the contact strip.

This first embodiment ensures that the cover cap by means of the first and second wall sections surrounds the magnetic core on the side with the at least one contact element, so that here an advantageous partitioning or isolation of conductive parts without increasing the dimensions of the coil body to increase of safety distances between the at least one contact element and the magnetic core is achieved. Furthermore, a mechanically reproducible positioning of the cover cap on the bobbin is achieved by the recess, which e.g. an advantage for a mechanical assembly of wound and equipped with a core bobbins with cover cap allowed pen. Because the recess extends only partially along the longitudinal direction of the contact strip, in particular the contact strip is not completely penetrated and is open on more than one side, the cover cap can be reliably attached to the coil body by means of the second wall section through the recess. A positive connection between the cover cap and the coil body is ensured in that the recess in the contact strip is designed as a negative shape with respect to the second wall section.

In an advantageous embodiment of the first embodiment of the second aspect of the invention, the at least one web section can be spaced from the second wall section by an air gap. This can ensure that the magnetic core on a Page that is trimmed to the side with the at least one contact element, is sufficiently isolated by the cover cap from and the cover cap can be inserted sufficiently deep into the coil body independently of the Stegabschnit th.

In a further advantageous embodiment of the first embodiment of the second aspect of the invention, the cover cap can furthermore have a third wall section and a fourth wall section, which are oriented perpendicular to the first and second wall sections. Furthermore, the third wall section and the fourth wall section can extend parallel to the at least one web section and in each case along an edge of the first wall section. As a result, an advantageous partitioning of the winding and the magnetic core with respect to the at least one contact element on the coil body is achieved by the cap. Here, too, the cover cap can be provided as a pot-shaped or shell-shaped insulating body, which enables a mechanically stable covering of the core received in the coil body with respect to the at least one contact element. According to an illustrative example herein, the recess can be formed from three groove-shaped recessed sections which are each designed to partially accommodate the second to fourth wall sections. As a result, three wall sections of the covering cap can advantageously be partially received by the recess, which can enable the magnetic core to be reliably sealed off from the at least one contact element. As a result, compliance with safety standards with regard to the winding can also be ensured.

In an advantageous second embodiment of the second aspect of the invention and according to an advantageous embodiment of the third embodiment of the first aspect, more than one web section can be formed on the first wall section as a plurality of web sections. The plurality of web sections protrudes toward the magnetic core from the first wall section, at least one of the plurality of web sections being in physical contact with the magnetic core. This provides a labyrinth structure on the side of the first wall section of the cover cap facing the magnetic core, so that an extension of air and creepage distances is provided.

In an advantageous third embodiment of the second aspect of the invention and according to an advantageous embodiment of the third embodiment of the first aspect, the cover cap can be slipped onto the coil body so that the magnetic core is at least partially surrounded by the cover cap on at least three side surfaces. Here the Cover cap can be provided as a pot-shaped or shell-shaped insulation body, which enables a mechanically stable covering of the core received in the coil body relative to the at least one contact element.

In an advantageous embodiment of the third embodiment of the second aspect and according to an advantageous embodiment of the first aspect of the invention, the at least one contact element on the coil body can be designed as a Gull-wing contact pin. This allows a structural configuration of the contact element and cover cap that allows the inductive component to be implemented in an SMD (surface mounted device) design as an SMD component. A compliance with safety standards is ensured by the cover cap in these designs. Alternatively, the at least one contact element can be designed as a contact pin for THT (through hole technology) design, so that the inductive component for through-hole assembly is provided as a THT component. Here, through-hole mounting in THT (also referred to as “pin-in-hole” or PIH technology) is understood to mean the assembly of wired electronic components in assembly and connection technology, in which, in contrast to surface mounting according to SMD technology (also “ surface-mounting technology ”or SMT) components have wire connections and are designed as“ wired components ”that are inserted through contact holes in the circuit board during assembly and then by soldering (conventional hand soldering, wave soldering, selective soldering, etc.) with one or more Conductors are connected. In the case of SMD assembly, on the other hand, no wire connections are provided, instead SMD components are soldered directly onto a circuit board as flat modules using solderable connection surfaces.

In an advantageous fourth embodiment of the second aspect of the invention and according to an advantageous embodiment of the first aspect, the at least one contact element can be arranged on a high-voltage side of the coil body. This ensures on the high-voltage side of inductive components that safety standards are observed.

In an advantageous embodiment of the fourth embodiment of the second aspect of the invention and according to an advantageous embodiment of the third embodiment of the first aspect, the at least one contact element can be arranged on a high-voltage side of the coil body. This ensures sufficient safety distances on the high-voltage side of the bobbin. In an advantageous embodiment of the first and second aspect of the invention, the coil body can be designed for SMD assembly of a circuit board and the inductive component is provided as an SMD component. In this way, for example, compact chopper transformers can be implemented. Alternatively, the coil body can be designed for THD assembly of a circuit board and the inductive component is provided as a THD component. Corresponding components can be provided with small dimensions while maintaining the necessary air and creepage distances.

In the context of the invention, sufficient air and creepage distances are ensured in a safe and reliable manner regardless of the dimensions of the inductive component, without, for example, requiring potting. The cover cap is only attached to a point on the coil body where an improvement in creepage and insulation distances is required. It is also possible to easily retrofit existing components with caps or to replace existing caps, for example in the course of maintenance work, etc. Inductive components, as described above and below with regard to various embodiments, allow simple assembly and removal of the cap, with the Cover cap is only attached to a contact strip of the bobbin. As a result, the invention can advantageously be applied to SMT and THT without the design of a coil body having to be modified significantly.

In embodiments, the side surface section of the magnetic core which is trimmed to the contact elements is at least partially covered by a wall section of the cover cap, which means that leakage currents can be suppressed very efficiently. The cover cap allows an insulation body to be provided separately in addition to the coil body, which enables the inductive component to be modularized and air and creepage distances to be retrofitted. The cover cap and the coil body can be mechanically detachably coupled, which means that creepage distance extensions can be achieved in a simple manner in a ductile component and, if necessary, individual components can be replaced and retrofitted. An extension of the air and creepage distances can be specified via the number of web sections and their geometric configuration, with a labyrinth structure being implemented on a wall section of the cover cap facing the magnetic core. In addition, the web sections serve as Spacers that prevent the magnetic core from slipping back in the direction of the at least one contact element and, using this advantageous measure, also set a position of the core on the coil body. Furthermore, the cover cap can easily be produced by, for example, injection molding techniques and can be produced inexpensively in large numbers.

For example, at least in some of the embodiments described herein, it is advantageous that a reliable attachment of the cover cap 20 is made possible by inserting the cover cap into the recess in the coil body in a manner essentially normal to the side surface of the contact strip in which the recess is formed, so that the cover cap can be reliably and reproducibly attached to the coil body relative to the magnetic core. This attachment can be detachable, in that the cover cap is simply inserted, or the cover cap can also be permanently attached to the coil body by means of an adhesive or the like. It is also advantageous here that the cover cap can only be attached to a contact strip of the coil former, so that the cover cap can be arranged in a space-saving and compact form only on the contact strip or the at least one contact element on which an increase in creep - And isolation distances is desired, such as a con tact element to which a high voltage is applied during operation, or on a high-voltage side of the bobbin.

Further advantages and features of the invention are described in more detail below in connection with the accompanying figures, wherein:

FIG. 1 a shows a cover cap for an inductive component according to embodiments of FIG

Shows the invention in a perspective view schematically,

Fig. 1b schematically shows the cap from Fig. 1a in a top view,

2a shows a coil former for an inductive component according to embodiments of FIG

Shows the invention schematically in a perspective side view,

Fig. 2b schematically shows the coil body from Fig. 2a in a side view rotated relative to Fig. 2a,

FIG. 2c schematically shows the coil former from FIG. 2a in a view from below, and FIG Fig. 3 shows an inductive component according to embodiments of the invention in a view from above of the component schematically.

With reference to FIGS. 1 a and 1 b, a cover cap 20 for an inductive component according to some illustrative embodiments of the invention corresponding to the above first and second aspects of the invention is described below. The cover cap 20 is formed from an electrically insulating material. For example, the cover cap 20 can be produced by injection molding processes.

The cover cap 20 can be provided, for example, as a pot-shaped or bowl-shaped insulation body, the cover cap 20 being formed by a first wall section 22, a second wall section 23, a third wall section 25 and a fourth wall section 27, which are each connected to one another along edges , so that the cover cap 20 from, for example, geometrically represents a cuboid body with two adjacent open sides. The second to fourth wall sections 23, 25, 27 of the cover cap 20 are mechanically connected to the first wall section 22 along three side edges of the first wall section 22 and extend away from the first wall section 22 along a direction of the surface normal to the first wall section 22. The second wall section 23 is in each case to the first wall section 22, the third wall section 25 and the fourth wall section 27 oriented perpendicularly. The third wall section

25 and the fourth wall section 27 are oriented parallel to one another. As a result, a volume above the first wall section 22 is laterally surrounded by the second to fourth wall sections 23, 25, 27 on three sides.

As shown in FIGS. 1 a and 1 b, the cover cap 20 has two web sections 24,

26, which are formed on the first wall section 22 and extend away from the first wall section 22 along a direction of the surface normal of the first wall section 22. The web sections 24, 26 are parallel to one another, parallel to the third and fourth wall sections 25, 27 and perpendicular to the first and second wall sections 22, 23.

According to the illustration in FIG. 1 a, the web sections 24, 26 can be spaced from the second wall section 22 by an air gap S. In other words, the web sections 24, 26 can only be mechanically connected to the first wall section 22. Wei terhin, a length of the web sections 24, 26 along a direction in which the Stegab sections 24, 26 protrude from the first wall section, be less than or equal to a length of the second to fourth wall sections 23, 25, 27 along this direction. If the second to fourth wall sections 23, 25, 27 have unequal lengths along this direction, a length of the web sections along this direction can be less than or equal to a largest of the lengths of the second to fourth wall sections 23, 25, 27 along this direction be.

With reference to FIGS. 2a to 2c, a coil former 20 for an inductive component will now be described in accordance with some illustrative embodiments corresponding to the first and second aspects of the invention.

According to the illustration in FIGS. 2a to 2c, the coil body 20 has two contact strips 33, 35 which are connected to one another by a connecting section 31 '. The con tact strips 33, 35 are formed at opposite ends of the connecting portion 31,, which can for example have a hollow cylindrical shape. The contact strips 33, 35 are elongated elements of the coil body 30, which means that they each have a longitudinal direction in which the contact strips 33, 35 each have a largest dimension.

In some illustrative examples, the connecting section 31 'can have two openings at opposite ends of the connecting section 31', the contact strips 33, 35 each being arranged at one of these ends. As a result, a Magnetkernauf acquisition 31 is provided, through which a magnetic core (not shown in FIGS. 2a to 2c) can be partially received by the bobbin 30. For example, a leg of a magnetic core (not shown in Figs. 2a to 2c) in the Magnetkernauf acquisition 31 of the bobbin 30 are partially received.

With reference to FIG. 2b, the contact strip 33 is arranged on a high-voltage side HS of the coil body 30 and the contact strip 35 is arranged on a low-voltage side NS of the coil body. Furthermore, the bobbin 30 has at least one contact element 50 attached to the contact strip 33 on the HS side of the bobbin 30 for electrical connection with at least one winding (not shown in FIGS. 2a to 2c). On the contact strip 35 on the NS side of the coil former 30, at least one further contact element 52 for electrical connection to at least one winding (in 2a to 2c not shown). Additionally or alternatively, “the longitudinal direction” of the contact strip 33 can also be defined as follows with regard to contact elements on the contact strip 33. If, for example, a plurality of contact elements 50 are provided on the contact strip, a longitudinal direction of the contact strip 33 can be set as a direction along which the plurality of contact elements 50 are arranged along the contact strip 33.

According to some illustrative embodiments, the NS side of the bobbin 30 can represent a low-voltage side of an inductive component (not shown in FIGS. 2a to 2c) and the HS side of the bobbin 30 can represent a high-voltage side. A distinction between the low-voltage side on the NS side of the coil body 30 and the high-voltage side on the HS side of the coil body 30 can be made in that the contact strip 33 on the HS side of the coil body 30 relative to the contact strip 35 on the NS side of the coil body Has greater width (ie, a dimension of the contact strip 33 in a direction along which a magnetic core (not shown in FIGS. 2a to 2c) is received in the magnetic core receptacle 31 of the coil former 30 when the coil former 30 is fitted with a magnetic core, is in Compared to the contact strip 35 larger).

In exemplary embodiments of the invention, the coil body 30 is formed on the contact strip 33 of the coil body 30 as a counterpart to the cover cap 20. For example, the coil body 30 as shown in FIGS. 2a and 2c has an elongated recess 32 on the HS side. The elongated recess 32 can represent a groove-shaped recess which is formed in the contact strip 33 in such a way that it extends in the longitudinal direction only partially along the contact strip 33 and runs in the contact strip 33 over the at least one contact element 50. Here, an “elongated recess” is to be understood as a recess, for example a groove or elongated notch, which has a direction of extension transverse to a depth direction (ie a direction along a depth of the recess into the material of the contact strip 33, in which the recess 32 is formed as a recess), wherein the direction of extent is a direction along which the recess 32 has a largest dimension. Since the recess 32 extends in the longitudinal direction le diglich partially along the contact strip 33, the recess 32 in the longitudinal direction only has one opening that is only in one side surface of the contact strip 33 ge forms in which the at least one contact element 50 on Bobbin 30 is exposed. In embodiments of the invention, the recess 32 is designed in such a way that a cover cap, for example the cover cap 20 shown in FIGS. 1 a and 1 b, can be partially received therein, so that a form-fitting connection is formed between the cover cap and the coil body . In this case, the recess 32 can represent a negative shape of a section of the covering cap 20, so that the coil body 30 on the contact strip 33 is partially designed as a negative shape of the covering cap 20. For example, the second wall section 23 of the cap 20 shown in FIGS. 1a and 1b can be inserted into the recess 32, so that the second wall section 23 is partially received in the recess 32, the contact strip 33 partially as a negative shape of the second wall section 23 of the cap 20 is formed. For this purpose, according to some specific illustrative examples, the recess 32 can be designed as a longitudinal groove, for example only in the form of a longitudinal groove 32a, which is shown in FIG. 2a. The longitudinal groove 32a can run parallel to the longitudinal direction of the contact strip 33 over the at least one contact element 50, the longitudinal direction of the contact strip 33 being a longest geometric dimension of the contact strip 33 as described above. The longitudinal groove 32a extends in the longitudinal direction of the contact strip 33 only partially along the contact strip 33. There are no openings in the longitudinal groove 32a at the ends of the contact strip 33 along the longitudinal direction of the contact strip 33. This allows the covering cap 20 to be reliably attached by inserting the covering cap 20 into the longitudinal groove 32a, essentially normal to the side surface 14, so that the covering cap 20 can be attached reliably and reproducibly to the coil body 30 relative to the magnetic core 10. This attachment can be detachable by simply inserting the cover cap 20, or the cover cap 20 can also be permanently attached to the coil body 30 by means of an adhesive or the like. Here, it is also advantageous that the cap 20 can only be attached to a contact strip of the coil former 30, so that the cap 20 can be arranged in a space-saving and compact form only on the contact strip 33 or the at least one contact element 50 , on which an increase in creepage and insulation distances is desired, such as a contact element 50 to which a high voltage is applied during operation, or on a high-voltage side of the coil former 30.

With reference to Fig. 2a in connection with Fig. 1a, a special illustrative embodiment of the recess 32 is described, according to which the recess 32 is formed from three groove-shaped recess sections 32a, 32b, 32c, each of which is used to partially accommodate the second to fourth wall sections 23, 25, 27 of the cap 20 shown in FIG. 1a are, the contact strip 33 partially as a negative shape of the second to fourth Wandab sections 23, 25, 27 of the cap 20 is formed. For example, each of the three groove-shaped recess sections 32a, 32b, 32c is designed as a longitudinal groove, which are connected to one another and realize a single continuous recess corresponding to the recess 32 provided in FIG. 2a. The groove-shaped recess sections 32b and 32c are oriented perpendicular to the groove-shaped recess section 32a and the groove-shaped recess sections 32b and 32c run parallel to one another. By means of the three groove-shaped recess sections 32a, 32b, 32c, the recess 32 can be provided in such a way that the second to fourth wall sections 23, 25, 27 of the cover cap 20 shown in FIG. 1a can be inserted into the three groove-shaped recess sections 32a, 32b, 32c and in particular can be partially accommodated in the three groove-shaped recess sections 32a, 32b, 32c.

According to some illustrative embodiments, the cover cap 20 shown in FIGS. 1a and 1b can be mounted on the coil body shown in FIGS. 2a to 2c in such a way that the cover cap is inserted into the recess. The cover cap 20 is thus arranged on the HS side of the bobbin 30 between an opening in the magnetic core receptacle 31 of the bobbin 30 and the at least one contact element 50.

With reference to FIGS. 2 a to 2 c, the at least one contact element 50 can be designed as a gull wing contact pin and attached to the contact strip 33. Correspondingly, the at least one contact element 52 can also be designed as a gull wing contact pin and attached to the contact strip 35. The coil body 30 can thus be designed for SMD assembly of a circuit board (not shown in the figures). For example, the bobbin 30 is suitable for applications relating to a chopper transformer.

According to the illustration in Fig. 2c, the coil body 30 can have a labyrinth structure L on its underside. The labyrinth structure L is provided on the contact strip 33 and is formed by web sections L1, L2, L3, L4 and groove sections N1, N2, N3 formed on the underside of the contact strip 33. One of the groove sections N1, N2, N3 is formed between each two adjacent web sections of the web sections L1, L2, L3, L4, so that two adjacent web sections are spaced from each other by a groove section. In this case, the slot sections N1, N2, N3 can be provided to a wire section of a winding provided above the coil body (not shown in FIGS. 2a to 2c), the at least one contact element 50 to be supplied. In the case of more than one contact element, wire sections which are each fed to the contact elements can thus be separated from one another by the web sections L1 and L3. A corresponding labyrinth structure can also be provided on the underside of the contact strip 35.

With further reference to Fig. 2c, an offset of the at least one contact element 50 is shown relative to the grooves N1 to N3 and the at least one contact element is formed in one of the web sections L1 to L4.

With reference to the plan view shown in FIG. 3, an inductive component 100 according to embodiments of the present invention is described below in accordance with the first and second aspects of the invention. The inductive component 100 comprises the cover cap 20, which is described above with reference to FIGS. 1 a and 1 b, and the coil body 30, which is described above with reference to FIGS. 2a to 2c.

According to the illustration in FIG. 3, the inductive component 100 further comprises a magnet core 10 and at least one winding W which is provided above the coil former 30. In some illustrative embodiments, the magnetic core 10 of the inductive component 100 can be designed as a modular magnetic core. For example, the magnet core 10 can be a U-core, double-U-core or U-I-core, which is partially received in the Magnetkernauf 31 (FIGS. 2a and 2b) of the bobbin 30. Alternatively, the Mag netkern 10 can only be an I-core which is inserted into the magnetic core receptacle 31 of the bobbin. According to another alternative, not shown, an E-core or a double-E-core can be provided, wherein the coil body can be designed accordingly to accommodate the central piece and with contact surfaces for the side legs.

As described above with reference to FIGS. 2a to 2c, the coil former 30 has the at least one contact element 50 which is attached to the side HS of the coil former 30. The at least one contact element is provided for electrical connection to the at least one winding W.

As described above with reference to FIGS. 1 a and 1 b, the cover cap 20 is formed from an electrically insulating material. The cover cap 20 is attached to the coil body 30 by being pushed onto it, the second wall section 23 being inserted into the recess is. The cap 20 covers a side surface 14 of the magnetic core 10 received in the coil body 30 with respect to the at least one contact element 50 on the HS side of the coil body 30. In particular, the cap 20 is between the side surface 14 of the magnet core 10 and the at least one contact element 50 arranged on the coil body. Furthermore, the magnetic core 10 can be shielded on the HS side of the coil body 30 with respect to the at least one contact element 50 by the third and fourth Wandab sections 25, 27 of the cap 20. In some illustrative embodiments, the third and fourth wall sections 25, 27 of the cover cap 20 can be partially received in the recess 32, as described above with regard to FIG. 2a.

According to the illustration in Fig. 3, the side surface 14 of the magnetic core 10, which is the side HS of the bobbin 30 and thus the contact strip 33 with the at least one contact element 50, is at least partially covered by the first wall section 22 of the cap 20 at least.

As described above with regard to FIGS. 2a to 2c, the HS side of the coil former 30 can represent a high-voltage side of the inductive component 100 in some illustrative embodiments of the invention, and the NS side of the coil former 30 can represent a low-voltage side of the inductive component 100. A distinction between tween the low voltage side on the NS side of the bobbin 30 and the high voltage side on the HS side of the bobbin 30 can be made to the effect that the cover cap 20 on the HS side of the bobbin 30 in the inductive component 100 is angeord net and the side surface 14 of the magnetic core 10, ie the side of the magnetic core 10 which is trimmed to the HS side of the bobbin is covered by the cap 20 with respect to the at least one contact element 50 on the contact strip 33 of the HS side of the bobbin 30.

According to illustrative examples, the at least one contact element 50 can extend away from the coil body 30 in a direction normal thereto with respect to the first wall section 22.

With reference to FIGS. 1 a, 2 a and 3, the cover cap 20, as described above with regard to FIG. 1 a, has an air gap S which separates the web sections 24 and 26 from the second wall section 23. The air gap is made sufficiently large, see above that the cap 20 can be attached to the coil body 30 independently of the web sections 24 and 26 by inserting the second wall section 23 into the recess 32 until the first wall section 22 below the web sections 24, 26 hits the contact strip 33. A distance between the first wall section 22 and the side surface 14 of the magnet core 10 can thus be set by the web sections 24 and 26.

The inductive component 100 shown in FIG. 3 can be manufactured by a method that involves winding the coil bobbin 30 with the at least one winding W, taking the magnetic core 10 into the bobbin 30 and attaching the cover cap 20 to the bobbin 30 includes. The magnetic core 10 is partially received in the magnetic core receptacle 32 of the bobbin 30. The winding of the bobbin 30 can take place independently of the magnetic core 10 and the fitting of the Spulenkör pers 30 with the magnetic core 10 can, for example, take place separately or simultaneously with it. The magnetic core 10 can also be received in the bobbin 20 in that e.g. individual core segments in the case of a modular magnetic core 10 are received in the coil body 30. This makes it possible to provide an automated production method for producing the inductive component 100. A position of the magnetic core 10 on the coil body 30 can be set by means of the cover cap 20, the cover cap 20 being attached to the coil body 30 before, during or after the magnetic core 10 is fitted to the coil body 30.

With reference to FIG. 3, the inductive component 100 described above is disclosed in some illustrative embodiments of the invention, wherein the at least one contact element 50 on the coil body 30 can be designed as a Gull-wing contact pin. However, this is not a limitation, and other contact pins can be provided.

With reference to FIG. 3, the inductive component 100 described above is disclosed in some illustrative embodiments of the invention, wherein the at least one contact element 50 can be arranged on a high-voltage side of the coil former 30. This does not represent a limitation of the present invention and, additionally or alternatively, at least one contact pin can be arranged on a low-voltage side of the coil former 30. With reference to FIG. 3, the inductive component 100 described above is disclosed in some illustrative embodiments of the invention, wherein the coil body 30 can be designed for SMD assembly of a circuit board (not shown). This is not a restriction and, alternatively, the inductive component 100 can be designed for THT assembly.

With reference to the figures, two web sections 24, 26 are shown on the cover cap 20. This is not a limitation and, alternatively, only one web section or more than two web sections can be provided on the cover cap.

With reference to the figures, it is described that the cover cap 20 can be plugged onto the contact strip 33 on the HS side of the coil former 30 through the recess 32. This does not constitute a limitation of the present invention and alternatively a recess corresponding to the recess 32 can also be formed on the NS side of the coil body, so that the cover cap 20 can additionally or alternatively be plugged onto the coil body 30 on the NS side.

With reference to the figures, the covering cap 20 is described in such a way that it is formed by four wall sections. This is not a limitation of the invention and a cover cap can only be formed by the first and second wall sections 22 and 23 or by a total of five wall sections, with a fifth in addition to the first to fourth wall sections 22, 23, 25, 27 described Wall section can be provided which is arranged opposite the second wall section on the first wall section 22 and extends parallel to the second wall section 23.

With reference to FIGS. 1 to 3, some specific exemplary embodiments with the inductive component 100 shown in FIG. 3 are described. The inductive component 100 comprises the illustrated magnetic core 10, the at least one illustrated winding W and the illustrated bobbin 30, which is wound with the at least one winding W. The coil body 30 comprises the illustrated at least one contact element 50, which is attached to the illustrated contact strip 33 of the coil body 30 for electrical connec tion with the at least one winding W, the illustrated Magnetkernauf acquisition 31 in which the magnetic core 10 is partially received, and the Depicted recess 32 under the magnetic core 10. The inductive component 100 also has the illustrated Cover cap 20, which is formed from an electrically insulating material and attached to the contact strip 33 Kon. The cap 20 covers the at least one Kontak telement 50 trimmed side surface 14 of the magnetic core 10 with respect to the at least egg NEN contact element 50 at least partially. The cap 20 has the first Wandab section 22 through which the cap 20 at least partially covers the side surface 14 of the magnet core 10 facing the at least one contact element 50 with respect to the at least one contact element 50, and which extends normal to the side surface 14 of the magnet core 10 extending second wall section 23 which is inserted into the recess 32. The first wall section 22 of the cap 20 has the illustrated at least one web section 24 which extends along a direction perpendicular to the side surface 14 of the magnet core 10 towards the magnet core 10 and away from the first wall section 22. In this case, the at least one web section 24 is spaced apart from the second wall section 22 by an air gap S.

In other special exemplary embodiments, in addition or as an alternative to the above embodiments, the inductive component 100 shown in FIGS. 1 to 3 comprises the magnetic core 10 shown, the shown at least one winding W and the shown bobbin 30, which is connected to the at least one Winding W is wound. The coil body 30 comprises the illustrated at least one contact element 50, which is attached to the illustrated contact strip 33 of the coil body 30 for electrical connection to the at least one winding W, and the illustrated magnetic core receptacle 31 in which the magnetic core 10 is partially received. The inductive component 100 also has the illustrated cover cap 20, which is formed from an electrically insulating material and which covers the illustrated side surface 14 of the magnetic core 10, which is aligned with the at least one contact element 50, through the illustrated first wall section 22 of the cover cap 20 the at least one contact element 50 is at least partially covered. The first wall section 22 of the cover cap 20 has the illustrated at least one web section 24 which extends away from the first wall section 22 in a direction perpendicular to the side surface 14 of the magnet core 10 towards the magnet core 10. According to these specific exemplary embodiments, the coil former 30 is designed for SMD mounting or for THD mounting on a printed circuit board. This means that the at least one contact element 50 is correspondingly designed as a THT contact element or SMT contact element. In other words, the at least one contact element 50 is designed as a through-hole contact pin or as a gull wing contact. In summary, within the scope of the invention, a labyrinth-like air and creepage distance extension is proposed, for example in U-core, double-U-core, I-core and U-core applications. This is achieved according to illustrative embodiments using a combi nation of a cover cap and a coil body, which is designed on a contact strip of the coil body as a counterpart to the cover cap, for example, the coil body is partially formed on a contact strip as a negative shape of the associated cover cap. If the cover cap, which is designed to be closed on the back of the core, is placed in the intended negative mold as a counterpart, the air and creepage distance increases from the at least one contact element assigned to the contact strip to the magnetic core sealed off by the cover cap. This principle can also be applied on both sides. In illustrative examples, the cover cap is designed with web sections on the inner side. These can be used as spacers and can prevent the magnetic core in the inductive component from slipping back in the direction of the rear wall of the cover cap. Using this measure, which defines the position of the magnetic core on the coil body, the air and creepage distances can also be lengthened according to the length of the web sections.

One effect of the subject matter of the present invention is that the size of inductive components while maintaining the required safety distances for basic insulation or reinforced insulation according to EN 61558-2-16 + A1 cannot be increased and preferably can be reduced. Furthermore, the safety clearances to the chassis are observed.

Although some embodiments are described in relation to an application of SMD components, this is not a limitation and by designing the contact elements on the contact strips of the coil body as contact pins for THT assembly, embodiments of the invention can also be used in connection with THT applications the.

Claims

Expectations

1. An inductive component (100) comprising: a magnetic core (10), at least one winding (W), one with the at least one winding (W) wound bobbin (30), comprising at least one on a contact strip (33) of the bobbin (30) attached contact element (50) for electrical connection with the at least one winding (W), a magnetic core receptacle (31) in which the magnetic core (10) is partially received, and an elongated recess formed in the contact strip (33) (32), which extends under the magnetic core (10) received in the magnetic core receptacle (31) and above the at least one contact element (50) and only partially extends in a longitudinal direction of the contact strip (33) along the contact strip (33), and a cover cap (20) formed from an electrically insulating material, which is attached to the contact strip (33) and a side face (14) of the magnetic core (10) facing the at least one contact element (50) the at least one contact element (50) at least partially covered, the cover cap (20) having a first wall section (22) through which the cover cap (20) the side surface (14) of the magnetic core (10) facing the at least one contact element (50) with respect to the at least one contact element (50) we are at least partially covered, and has a normal to the first side surface (14) of the magnet core (10) extending second wall section (23) into the recess (32) formed in the coil body (30) is plugged in, and wherein the second wall section (23) extends between the magnetic core (10) and the at least one contact element (50) in the coil body (30).

2. Inductive component (100) according to claim 1, wherein the cover cap (20) further comprises a third wall section (25) and a fourth wall section (27) which are oriented perpendicular to the first and second wall sections (22, 23), and wherein the third wall section (25) and the fourth wall section (27) extend parallel to one another and each along an edge of the first wall section (22).

3. Inductive component (100) according to claim 2, wherein the recess (32) in the coil body (30) is formed from three groove-shaped recess sections (32a, 32b, 32c), each of which is used to partially accommodate the second to fourth wall sections (23, 25, 27) are formed.

4. Inductive component (100) according to one of claims 1 to 3, wherein the first wall portion (22) of the cover cap (20) has at least one web portion (24) which extends along a side surface (14) of the magnetic core (10) perpendicular direction to the magnetic core (10) away from the first wall portion (22).

5. Inductive component according to claim 4, wherein the at least one web section (24) is spaced from the second wall section (22) by an air gap (S).

6. Inductive component (100) comprising: a magnetic core (10), at least one winding (W), one with the at least one winding (W) wound bobbin (30), comprising at least one on a contact strip (33) of the bobbin (30) attached contact element (50) for electrical connection to the at least one winding (W), and a magnetic core receptacle (31), in which the magnetic core (10) is partially accommodated, and a cover cap (20) formed from an electrically insulating material, which has a side surface (14) of the magnetic core (10) that is designed for the at least one contact element (50) ) at least partially covered by a first wall section (22) of the cover cap (20) with respect to the at least one contact element (50), the first wall section (22) of the cover cap (20) having at least one Stegab section (24) extending along a extends away from the first wall section (22) in the direction perpendicular to the side surface (14) of the magnetic core (10) and is physically in contact with the magnetic core (10).

7. Inductive component (100) according to claim 6, wherein the coil body (30) has an elongated recess (32) formed in the contact strip (33), which is below the magnetic core (10) and above the magnetic core receptacle (31) we at least one contact element (50) extends and extends in a longitudinal direction of the contact strip (33) along the contact strip (33) only partially, with a normal to the side surface (14) of the magnetic core (10) in the recess (32) extending second wall section (23) of the cap (20) is inserted.

8. Inductive component (100) according to claim 7, wherein the at least one Stegab section (24) from the second wall section (22) by an air gap (S) is spaced.

9. Inductive component (100) according to claim 7 or 8, wherein the cap (20) further has a third wall section (25) and a fourth wall section (27) aufwei sen, which is oriented perpendicular to the first and second wall sections (22, 23) and wherein the third wall section (25) and the fourth wall section (27) extend parallel to the at least one web section (24) and in each case along an edge of the first wall section (22).

10. Inductive component (100) according to claim 9, wherein the recess (32) is formed from three groove-shaped recess sections (32a, 32b, 32c), each of which is designed to partially accommodate the second to fourth wall sections (23, 25, 27) are.

11. Inductive component (100) according to one of claims 4 to 10, wherein more than one web section (24, 26) is formed as a plurality of web sections on the first wall section (22).

12. Inductive component (100) according to one of claims 1 to 11, wherein the cover cap (20) is attached to the coil body (30) so that the magnetic core (10) on at least three side surfaces at least partially from the cover cap (20) is around.

13. Inductive component (100) according to one of claims 1 to 12, wherein the least one contact element (50) is designed as a gull wing contact pin and the inductive component (100) is provided as an SMD component.

14. Inductive component (100) according to one of claims 1 to 12, wherein the least one contact element (50) is designed as a TH D contact pin and the inductive component (100) is provided as a THD component.

15. Inductive component (100) according to one of claims 1 to 14, wherein the cover cap (20) is only on a high-voltage side (HS) of the coil former (30) is arranged.