Ring-core transformer

Abstract

A ring-core transformer, in particular having a toroidal ring core, wherein the transformer has a ring winding, in particular wherein the ring axis of the ring winding is oriented coaxially to the ring axis of the ring core, wherein the transformer has a toroidal winding on the ring core, in particular wherein the toroidal winding has a primary winding and a secondary winding, which are wound in particular on the ring core, wherein the ring winding is arranged between the ring core and the toroidal winding.

Description

[0001] Transformer with toroidal core

[0002] Description:

[0003] The invention relates to a transformer with a toroidal core.

[0004] From WO 2020 / 001811 A1, a toroidal transformer is known as the closest prior art.

[0005] An orthogonal winding is known from US4210 859 A.

[0006] A toroidal winding with an internal winding is known from CA 3009929 A1.

[0007] A transformer is known from EP 2 603 920 B1.

[0008] A transformer with a toroidal core is known from US 2008 / 0 204 180 A1.

[0009] An inductive component with a toroidal core is known from US 2002 / 0 017 976 A1.

[0010] A transformer with a toroidal core is known from JP 4 523 389 B2.

[0011] The design of ferrite layers is known from DE 10 2012 202 472 A1.

[0012] Components having a toroidal core are known from EP 1 933 339 A2.

[0013] A hollow toroidal magnetic power unit is known from EP 3 428 937 A1.

[0014] A controllable transformer is known from US 2005 / 0 110 605 A1.

[0015] A toroidal coil is known from JP 2001-167 935 A.

[0016] A toroidal coil is also known from JP S60-32 313 A. A magnetic core is also known from JP S60-32 313 A.

[0017] A transformer with a toroidal core is known from DE 10 2019 003 843 A1.

[0018] The invention is therefore based on the object of designing a toroidal core transformer and a system for supplying electricity to a load in a compact manner.

[0019] According to the invention, the object is achieved in the transformer according to the features specified in claim 1.

[0020] Important features of the invention in the transformer, in particular with a toroidal toroidal core, are that the transformer has a toroidal winding, in particular wherein the ring axis of the toroidal winding is aligned coaxially to the ring axis of the toroidal core, wherein the transformer has a toroidal winding on the toroidal core, in particular wherein the toroidal winding has a primary winding and a secondary winding, in particular which are wound on the toroidal core, wherein the toroidal winding is arranged between the toroidal core and the toroidal winding, in particular is arranged radially between the toroidal core and the toroidal winding, in particular wherein the toroidal core is made of ferrite, in particular wherein the radial direction is related to the ring axis.

[0021] The advantage here is that the toroidal core can be utilized efficiently. Because the toroidal winding and the toroidal winding are orthogonal to each other, they can be operated without interference from each other, as long as the toroidal core is not operated in saturation.

[0022] The toroidal winding can be used in a gyrator. The ring winding can be used as an inductor in an electronic circuit that includes the gyrator. The two ring windings are arranged within easy reach of a cooling airflow, thus ensuring efficient heat dissipation.

[0023] In an advantageous embodiment, the toroidal core is designed as a rotary body which is produced from a U-shaped basic structure, in particular wherein the rotational symmetry axis of the rotary body is aligned coaxially to the ring axis of the toroidal winding, in particular wherein the U is aligned so as to be open radially outwards and / or the legs of the U are arranged radially outside the yoke of the U connecting the legs of the U, in particular wherein the toroidal winding is received in a radially directed recess of the toroidal core and / or wherein the toroidal winding is received in the recess produced by the U, in particular wherein the toroidal winding is arranged radially outside the toroidal core, in particular at least in the axial region covered by the toroidal winding in the axial direction, in particular wherein the toroidal winding is axially delimited on both sides by the legs of the U. The advantage here is that simple production can be achieved.Furthermore, the toroidal core can be split into two parts, so that the two toroidal core components are structurally identical and / or identical to each other. The toroidal winding is axially limited by the toroidal core.

[0024] In an advantageous embodiment, the toroidal core is designed as a rotating body produced from a T-shaped or E-shaped basic structure, in particular wherein the rotational symmetry axis of the rotating body is aligned coaxially to the ring axis of the toroidal winding, wherein a first winding part of the toroidal winding is axially spaced from a second winding part of the toroidal winding by means of a leg of the T or by means of the middle leg of the E. It is advantageous in this case that the toroidal winding can be designed in two spaced-apart partial windings, in particular winding parts, which can be spaced apart from one another by means of the ferrite material of the toroidal core. In the T-shaped design, the holding parts axially delimit the partial windings. In the E-shaped design, the toroidal core itself axially delimits the partial windings.

[0025] In an advantageous embodiment, the winding wire of the toroidal winding extends perpendicular to the direction of extension of the nearest winding wire section of the toroidal winding. This is advantageous because efficient utilization of the toroidal core is achieved.

[0026] In an advantageous embodiment, the main magnetic field generated by the toroidal winding is oriented perpendicular to the main magnetic field generated by the toroidal winding. This has the advantage of allowing efficient utilization of the toroidal core.

[0027] In an advantageous embodiment, the toroidal winding comprises partial windings, in particular, the primary winding and the secondary winding each comprise partial windings, wherein the partial windings are spaced apart from one another in the circumferential direction, in particular relative to the ring axis of the toroidal core, in particular are regularly spaced apart from one another. It is advantageous that the voltage gaps are sufficiently large.

[0028] In an advantageous embodiment, the transformer has a flux guide body which is arranged outside the space wrapped by the primary winding and the secondary winding, in particular outside the toroidal core. The advantage here is that the flux guide body concentrates the stray flux and thus increases the stray inductance. Furthermore, the escape of field lines is thus reduced, thus achieving magnetic shielding. This in turn means that electrically conductive materials, such as aluminum housing parts, in the vicinity of the transformer only reduce its stray inductance to a very small extent. In an advantageous embodiment, the flux guide body is designed as a single piece, in particular as a single piece, or as multiple pieces, in particular as multiple pieces. The advantage here is that simple, cost-effective production is possible.

[0029] In an advantageous embodiment, the flux guide body has a second ferrite ring which is arranged coaxially to the toroidal core, wherein the second ferrite ring is axially spaced from the toroidal core including the primary winding and the secondary winding, in particular the axial region covered by the toroidal core including the primary winding and the secondary winding is spaced from the axial region covered by the second ferrite core, and / or wherein the wall thickness of the second ferrite ring is smaller in the axial direction than in the radial direction, and / or wherein the radial spacing region covered by the second ferrite core is encompassed by the region covered by the toroidal core including the primary winding and the secondary winding.

[0030] Radial distance range or overlaps with it. The advantage here is that the stray flux is further concentrated.

[0031] In an advantageous embodiment, the flux guide body comprises a first ferrite ring arranged coaxially with the toroidal core, wherein the wall thickness of the first ferrite ring is smaller in the radial direction than in the axial direction and / or wherein the radial spacing region covered by the first ferrite core is spaced from the radial spacing region covered by the toroidal core including the primary winding and secondary winding, and / or wherein the axial region covered by the first ferrite core is encompassed by or overlaps with the axial region covered by the toroidal core including the primary winding and secondary winding. This has the advantage that the stray flux is further concentrated.In an advantageous embodiment, the flux guide body has a further ferrite ring which is arranged coaxially to the toroidal core and is arranged on the side of the toroidal core facing away from the second ferrite ring, wherein the further ferrite ring is axially spaced from the toroidal core including the primary winding and secondary winding, in particular the axial region covered by the toroidal core including the primary winding and secondary winding is spaced from the axial region covered by the further ferrite core, in particular.

[0032] - wherein the wall thickness of the further ferrite ring is smaller in the axial direction than in the radial direction and / or wherein the radial spacing area covered by the further ferrite core is encompassed by or overlaps with the radial spacing area covered by the toroidal core including the primary winding and secondary winding.

[0033] The advantage here is that the stray flux is bundled even further.

[0034] In an advantageous embodiment, the first ferrite ring is composed of a plurality of ferrite plates, in particular which are each aligned tangentially.

[0035] In an advantageous embodiment, the ferrite plates are arranged, in particular, by means of double-sided adhesive tape on flat surface areas, in particular contact surfaces, of a carrier part. This is advantageous because it enables simple production.

[0036] In an advantageous embodiment, the carrier part, in particular the first plastic injection-molded part, has a radially projecting collar region on its axial end region facing away from the first ferrite ring, which collar region is connected to a holding plate, in particular by means of screws. This has the advantage that simple production is enabled. In an advantageous embodiment, the carrier part, in particular the first plastic injection-molded part, surrounds the toroidal core including the primary winding and secondary winding radially, in particular in a hood-like manner, wherein a dome section of an air guiding part, in particular of a second plastic injection-molded part, projects into the spatial region radially surrounded by the toroidal core, such that an air flow conveyed by a fan is guided along the primary winding and secondary winding, in particular wherein the air guiding part is connected to the holding plate, in particular by means of a screw.The advantage here is that the toroidal core can be efficiently cooled with a cooling air stream. This cooling air stream flows around the toroidal winding and the toroidal winding.

[0037] In an advantageous embodiment, holding parts are arranged on the end faces of the toroidal core, each having axially projecting support posts. The windings of the toroidal winding, in particular the primary winding and the secondary winding, are guided and / or held in recesses formed in the circumferential direction between the support posts. In particular, the holding parts are formed as plastic ring parts with axially projecting support posts, which are connected to the air guide parts or the support part with the fan cover. It is advantageous that the toroidal winding is wound in a guided manner.

[0038] In an advantageous embodiment, the retaining plate is trough-shaped and / or trough-shaped and has continuous slots on its side surfaces, in particular wherein the bottom of the trough or trough deflects the air flow towards the side surfaces, in particular having no continuous recesses that allow the air flow to pass through. The advantage here is that stable reception and fastening can be achieved. In an advantageous embodiment, a fan shroud is formed on the support part or connected to the support part at the axial end region of the support part facing away from the collar region, wherein the fan shroud concentrates, in particular directs, the air flow conveyed by a fan radially inwards. The advantage here is that the cooling air flow can be efficiently passed between the support part and the toroidal core and thus both windings can be cooled.In addition, a partial air flow is passed radially inside the toroidal core in order to also cool the radially innermost winding areas of the toroidal winding.

[0039] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0040] The invention will now be explained in more detail using schematic illustrations:

[0041] Figure 1 shows an exploded oblique view of a toroidal transformer according to the invention with primary winding 21 and secondary winding 22.

[0042] In Figure 2, in contrast to Figure 1, both the primary winding 21 and the secondary winding 22 are hidden so that the ring winding 20 becomes visible.

[0043] In Figure 3, the windings (20, 21, 22) of the toroidal core winding are shown exploded.

[0044] Figure 4 shows a cross-section through the toroidal transformer.

[0045] Figure 5 shows a corresponding top view.

[0046] Figure 6 shows another cross-section.

[0047] As shown in the figures, a toroidal core of the toroidal transformer according to the invention is composed of two toroidal core parts 30 and 31 and wound with a toroidal winding 20 whose ring axis is aligned coaxially with the ring axis of the toroidal core.

[0048] The toroidal core formed from the two toroidal core parts 30 and 31 has a radial recess in which the toroidal winding 20 is received.

[0049] A holding part 8 is placed on each of the two axial end regions of the toroidal core, which holding part is preferably made of plastic, in particular as a plastic injection-molded part.

[0050] The respective holding part 8 has circumferentially spaced, in particular evenly spaced, radially and / or axially directed recesses that serve as guides for a winding arrangement of the toroidal transformer. The winding arrangement comprises a primary winding 21 and a secondary winding 22, the turns of which are circumferentially separated from each other. In particular, the two windings 21 and 22 do not overlap.

[0051] Preferably, the secondary winding 22 is spaced from the primary winding 21 in the circumferential direction and counter to the circumferential direction.

[0052] In further embodiments according to the invention, the primary winding 21 and the secondary winding 22 are each designed as partial windings, which are then spaced apart from one another in the circumferential direction and counter to the circumferential direction.

[0053] On the holding part 8, a radially outwardly projecting eyelet 32 ​​is formed, which is used as an axial boundary or contact surface during the manufacture of the toroidal core transformer to define the adhesive gap between the two toroidal core parts 30 and 31, so that the adhesive gap can then be filled with adhesive and, after the adhesive has hardened, the axial length of the toroidal core including the attached holding parts 8 corresponds as closely as possible to a target value. In this way, the axial length of the winding arrangement can be manufactured very precisely, in particular with a high level of manufacturing accuracy.

[0054] The winding arrangement is radially surrounded by a first ferrite ring 24, which is preferably composed of individual ferrite plates that are placed, in particular glued, on flat contact surfaces 5 of a carrier part 6.

[0055] The support part 6 is hood-shaped and is connected at its first axial end region to a fan cover 7, in particular with a square pyramid section. An electric motor-driven fan can be accommodated in the fan cover 7, so that the air flow conveyed by the fan is guided by the fan cover 7 in such a way that the air flow flows in the axial direction, in particular in the direction of the ring axis of the toroidal transformer, through the support part 6 and through the toroidal core. In this way, the heat dissipation of the toroidal core is ensured. Furthermore, on the side of the toroidal core facing away from the fan cover 7, an air guide part 2 is arranged, on which air guide part 2 a dome section 3 projects axially towards the fan cover 7, the dome section 3 projecting into the interior region of the toroidal core.

[0056] The dome section 3 is formed as a rotational body whose rotational symmetry axis is aligned coaxially to the ring axis of the toroidal core.

[0057] Thus, the conveyed air flow is driven between the toroidal core and the dome section 3, so that the air flow is guided as completely as possible past the toroidal core and thus efficient heat dissipation can be achieved.

[0058] The dome section 3 is arranged on a perforated disc-shaped base section which has axially continuous recesses 9 which are irregularly, in particular unevenly, spaced from one another in the circumferential direction, so that the elevations on the holding part 8 project into the recesses 9 and thereby carry out the positioning and fixing of the holding part 8 relative to the air guide part 2 in a form-fitting manner.

[0059] The air guide element 2 is housed in a trough-like retaining plate 1, which also has axially protruding pin areas for positive positioning and / or circumferential limitation of the air guide element 2. For this purpose, the maximum outer radius is not constant but depends on the circumferential angle. In this way, the pin area secures the air guide element 2 in a positive fit.

[0060] The toroidal winding 20 is thus wound on the toroidal core and the winding arrangement is arranged radially outside the toroidal winding 20.

[0061] All windings, i.e., the toroidal winding 20 and the winding arrangement, especially the primary and secondary windings, are surrounded by the airflow driven by the fan, as they are arranged radially on the outside of the toroidal core and not inside the toroidal core. This enables efficient heat dissipation of all windings.

[0062] However, the winding wires of the winding arrangement run in the axial direction, i.e., perpendicular and / or orthogonal to the ring winding 20, whose winding wire extends essentially in the circumferential direction. The winding arrangement is a toroidal winding, in contrast to the ring winding 20.

[0063] Likewise, the field lines are essentially orthogonal to each other, especially in the toroidal core and the first ferrite ring 24. The toroidal core is made of ferrite. Therefore, as long as the ferrite material does not saturate, the windings can operate without interference.

[0064] In addition, a second ferrite core 23 is provided, which is preferably axially spaced from the first ferrite core 24 and arranged radially inside the first ferrite core 24.

[0065] The second ferrite core 23 is shaped like a perforated disc and is preferably formed in two parts, in particular from two parts that are identical to one another.

[0066] Thus, the winding arrangement is also loaded with ferrite material on the front side, i.e. on the front side of the winding arrangement facing away from the air guide part 2.

[0067] As shown in Figure 4, the toroidal winding 20 is arranged in a radial recess of the toroidal core formed from the toroidal core parts, in particular ferrite parts, 30 and 31. The toroidal winding 20 is preferably arranged symmetrically.

[0068] The two toroidal core parts (30, 31) are identical to each other.

[0069] Therefore, the toroidal core, i.e. the coil core of the toroidal winding 20, resembles a rotating body whose generating basic structure is U-shaped.

[0070] The toroidal winding 20 is bounded in the axial direction by the first toroidal core part 30 and, opposite to the axial direction, by the second toroidal core part 31.

[0071] In particular, the leakage flux is amplified by the first ferrite core 24 and the second ferrite core 23.

[0072] Thus, by arranging additional ferrite material outside the windings, in particular outside the space wrapped by the windings, the leakage flux can be specifically increased and thus a desired value can be achieved even for a stray field inductance concentrated on the secondary side.

[0073] The first ferrite ring 24 is designed with a greater wall thickness in the radial direction than in the axial direction.

[0074] In contrast, the second ferrite ring 23 is designed with a greater wall thickness in the radial direction than in the axial direction.

[0075] The toroidal core and each of the two ferrite rings (24, 23) are coaxially aligned with each other, in particular, they share the same ring axis. The composition of the first ferrite ring 24 from individual plates enables cost-effective production. Another advantage is that the resulting mechanical stresses do not lead to the destruction of the ferrite plates during temperature fluctuations during operation.

[0076] The fan cover 7 is preferably shaped as a square pyramid section.

[0077] The fan cover 7 is therefore funnel-shaped and concentrates the air flow conveyed by the fan into the fan cover 7 radially inwards, so that the air flow is directed onto the toroidal core.

[0078] Thus, the windings (20, 21, 22) are arranged on the toroidal core in the air flow and can be cooled.

[0079] The centrally raised, axially extending dome section 3 of the air guide part 2 is secured to the retaining plate 1 with a screw extending through the dome section 3 in such a way that the dome section extends into the space surrounded by the toroidal core. This directs the air flow more effectively along the windings (21, 22). The second ferrite ring 23, which also guides the stray flux in sections, is arranged on the side of the air guide part 2 facing away from the toroidal core.

[0080] The retaining plate 1 is made of aluminum. Improved magnetic shielding is also achieved by means of the additional ferrite material, in particular by means of the first, second, and third ferrite rings (22, 23, 41). Eddy currents in the vicinity of electrically conductive parts can therefore be reduced. This reduces the heating of such parts and thus also the risk of fire.

[0081] The retaining plate 40 is trough-shaped and has slots on its sides, in particular the side walls of the trough, so that the air flow conveyed by the fan 50 can be directed radially outwards.

[0082] The radial direction and the circumferential direction are always related to the ring axis of the toroidal core 30, which indicates the axial direction.

[0083] As shown in Figure 6, the secondary winding has a first and a second partial winding which are spaced apart from one another in the circumferential direction relative to the toroidal core, wherein turns of the primary winding are arranged in the spacing region.

[0084] It is therefore important that the partial windings of the secondary winding are circumferentially spaced from each other, electrically connected in series or parallel, and that the intermediate areas formed by the spacing contain turns of the primary winding. The additional ferrite cores bundle the field lines emerging outward.

[0085] In further embodiments according to the invention, the secondary winding is not formed from two, but from more than two partial windings which are connected in series and / or parallel to one another.

[0086] The number of turns of the partial windings is preferably the same. The partial windings are arranged symmetrically with respect to the primary winding.

[0087] Both holding parts 8 have eyelets 32 on their outer circumference, to which winding wires leading from the windings are attached, in particular, a respective winding wire is passed through the respective eyelet 32. During the manufacture of the toroidal core, before winding the toroidal core 30 and before adhesively bonding the toroidal core parts and / or holding parts 8, the eyelets 32 are used to attach spacers that axially space the toroidal core parts or the holding parts 48 from each other. During the adhesive bonding process, in particular during the curing of an adhesive, the spacing is thus secured and fixed.

[0088] After the adhesive connection has been made, the spacers are removed and then the winding is carried out, whereby the end regions of winding wires are fastened to the eyelets 32.

[0089] The holding parts 8 also each have a circumferentially extending channel into which winding wire is inserted to connect partial windings in the circumferential direction. In further embodiments of the invention, a different flux-conducting material is used instead of ferrite.

[0090] In further embodiments of the invention, a third ferrite core is arranged on the other end face. However, other positioning of the ferrite rings (24, 23) is also possible.

[0091] In further embodiments according to the invention, a third ferrite ring, which is preferably structurally identical to the first ferrite ring 24, is arranged on the side of the toroidal core facing away from the first ferrite ring 24, in particular symmetrically to the plane of symmetry and / or ring plane of the toroidal core.

[0092] As shown in Figure 7, a T-shaped basic structure can also be advantageously used, in which case the ring winding 20 is divided into two parts. A first winding part 72 of the ring winding 20 is thus axially delimited by the first holding part 8, and the second winding part 73 of the ring winding 20 is axially delimited by the second holding part 8.

[0093] In this alternative embodiment, the radial recess according to Figure 4 is divided into two parts, so that each winding part (72, 73) is accommodated in the respective part of the recess. In the embodiment according to Figure ?, the toroidal core is composed of the two toroidal core parts 70 and 71, which each have the respective part of the recess at the axially outer end region of the toroidal core instead of at their axial end region facing the respective other toroidal core part (70, 71).

[0094] In further embodiments of the invention, an E-shaped basic structure is used instead of the T-shaped basic structure, in which the parts of the two-part recess are spaced apart from the axial end of the respective toroidal core part (70, 71). Thus, a partial winding (72, 73) is each accommodated, particularly and axially limited, in the two parts of the two-part recess.

[0095] List of reference symbols

[0096] 1 retaining plate

[0097] 2 air guide part

[0098] 3 Cathedral section

[0099] 4 Collar area

[0100] 5 flat contact surfaces

[0101] 6 support part

[0102] 7 Fan cover, especially square pyramid section

[0103] 8 Holding part

[0104] 9 recesses

[0105] 20 ring winding

[0106] 21 Primary winding

[0107] 22 Secondary winding

[0108] 23 second ferrite ring

[0109] 24 first ferrite ring

[0110] 30 first toroidal core part

[0111] 31 second toroidal core part

[0112] 32 Eyelet, especially for positioning

[0113] 70 first toroidal core part

[0114] 71 second toroidal core part

[0115] 72 first winding part of the ring winding

[0116] 73 second winding part of the ring winding

Claims

Patent claims:

1. Transformer with a toroidal core, in particular with a toroidal core, wherein the transformer has a ring winding, in particular wherein the ring axis of the ring winding is aligned coaxially to the ring axis of the toroidal core, wherein the transformer has a toroidal winding on the toroidal core, in particular wherein the toroidal winding has a primary winding and a secondary winding, in particular which are wound on the toroidal core, wherein the ring winding is arranged between the toroidal core and the toroidal winding, in particular radially between the toroidal core and the toroidal winding, in particular wherein the toroidal core is made of ferrite, in particular wherein the radial direction is relative to the ring axis.

2. Transformer according to claim 1, characterized in that the ring core is designed as a body of revolution generated from a U-shaped base structure, in particular wherein the axis of rotational symmetry of the body of revolution is aligned coaxially to the ring axis of the ring winding, in particular wherein the U is oriented radially outwards and / or the legs of the U are arranged radially outside the yoke of the U connecting the legs of the U, in particular wherein the ring winding is received in a radially directed recess of the ring core and / or wherein the ring winding is received in the recess generated by the U, in particular wherein the ring winding is arranged radially outside the ring core, in particular at least in the axial area covered by the ring winding in the axial direction, in particular wherein the ring winding is bounded axially on both sides by the legs of the U.

3. Transformer according to claim 1, characterized in that the ring core is designed as a body of revolution which is generated from a T-shaped or E-shaped base structure, in particular wherein the axis of rotational symmetry of the body of revolution is aligned coaxially to the ring axis of the ring winding, wherein a first winding part of the ring winding is axially spaced from a second winding part of the ring winding by means of a leg of the T or by means of the middle leg of the E.

4. Transformer according to at least one of the preceding claims, characterized in that the winding wire of the ring winding extends perpendicular to the direction of extension of the nearest winding wire section of the toroidal winding, and / or that the main magnetic field generated by the ring winding is oriented perpendicular to the main magnetic field generated by the toroidal winding.

5. Transformer according to at least one of the preceding claims, characterized in that the toroidal winding has partial windings, in particular wherein the primary winding and the secondary winding each have partial windings, wherein the partial windings are spaced apart from each other in the circumferential direction, in particular with respect to the ring axis of the ring core, and in particular are spaced apart from each other regularly.

6. Transformer according to at least one of the preceding claims, characterized in that the transformer has a flux guide body which is arranged outside the area of ​​space wrapped by the toroidal winding, in particular by the primary winding (21) and by the secondary winding (22), and in particular outside the ring core.

7. Transformer according to at least one of the preceding claims, characterized in that the flux guide body is designed in one piece, in particular as a single unit, or in multiple parts, in particular as a multi-part unit.

8. Transformer according to at least one of the preceding claims, characterized in that the flux guide body has a second ferrite ring (23) which is arranged coaxially to the toroidal core, wherein the second ferrite ring (23) is axially spaced from the toroidal core together with the toroidal winding, in particular the primary winding (21) and secondary winding (22), in particular the axial area covered by the toroidal core together with the primary winding (21) and secondary winding (22) is spaced from the axial area covered by the second ferrite core, and / or wherein the wall thickness of the second ferrite ring (23) is smaller in the axial direction than in the radial direction, and / or wherein the radial spacing area covered by the second ferrite core is encompassed by or overlaps with the radial spacing area covered by the toroidal core together with the toroidal winding, in particular the primary winding (21) and secondary winding (22).

9. Transformer according to at least one of the preceding claims, characterized in that the flux guide body has a first ferrite ring (24) which is arranged coaxially to the toroidal core, wherein the wall thickness of the first ferrite ring (24) is smaller in the radial direction than in the axial direction and / or wherein the radial spacing area covered by the first ferrite core is spaced apart from the radial spacing area covered by the toroidal core together with toroidal winding, in particular primary winding (21) and secondary winding (22), and / or wherein the axial area covered by the first ferrite core (24) is encompassed by or overlaps with the axial area covered by the toroidal core together with toroidal winding, in particular primary winding (21) and secondary winding (22).

10. Transformer according to at least one of the preceding claims, characterized in that the flux guide body has a further ferrite ring which is arranged coaxially to the toroidal core and is arranged on the side of the toroidal core facing away from the second ferrite ring (23), wherein the further ferrite ring is axially spaced from the toroidal core together with the toroidal winding, in particular the primary winding (21) and secondary winding (22), in particular the axial area covered by the toroidal core together with the primary winding (21) and secondary winding (22) is spaced from the axial area covered by the further ferrite core, in particular - wherein the wall thickness of the further ferrite ring is smaller in the axial direction than in the radial direction and / or wherein the radial spacing area covered by the further ferrite core is encompassed by or overlaps with the radial spacing area covered by the toroidal core including toroidal winding, in particular primary winding (21) and secondary winding (22).

11. Transformer according to at least one of the preceding claims, characterized in that the first ferrite ring (24) is composed of a plurality of ferrite plates, in particular which are each tangentially aligned, and / or that the ferrite plates are arranged in particular by means of double-sided adhesive tape on each flat surface area, in particular contact surfaces, of a carrier part (6).

12. Transformer according to at least one of the preceding claims, characterized in that the support part (6), in particular the first plastic injection molded part, has a radially projecting collar area (4) at its axial end area facing away from the first ferrite ring (24), which is connected to a retaining plate, in particular by means of screws.

13. Transformer according to at least one of the preceding claims, characterized in that the support part (6), in particular the first injection-molded plastic part, radially surrounds the toroidal core including the toroidal winding, in particular the primary winding (21) and the secondary winding (22), in particular in a hood-like manner, wherein a dome section (3) of an air guide part, in particular of a second injection-molded plastic part, projects into the space area radially surrounded by the toroidal core, so that an airflow conveyed by a fan is guided along the toroidal winding, in particular the primary winding (21) and the secondary winding (22), in particular wherein the air guide part (2) is connected to the retaining plate, in particular by means of a screw.

14. Transformer according to at least one of the preceding claims, characterized in that retaining parts (8) are arranged on the end faces of the toroidal core, each having axially projecting support posts, wherein the turns of the toroidal winding, in particular the primary winding (21) and the secondary winding (22), are guided and / or held in recesses formed in the circumferential direction between the support posts, in particular wherein the retaining parts are formed as plastic ring parts with axially projecting support posts thereon, which are connected to the air guide parts or the carrier part (6) with fan hood (7).

15. Transformer according to at least one of the preceding claims, characterized in that the retaining plate is shaped in a trough and / or basin shape and has continuous slots on its side surfaces, in particular wherein the bottom of the trough or basin deflects the airflow towards the side surfaces, and in particular has no continuous recesses allowing the airflow to pass through.

16. Transformer according to at least one of the preceding claims, characterized in that a fan hood (7) is formed on the support part (6) or connected to the support part (6) at the axial end region of the support part (6) facing away from the collar region (4), wherein the fan hood (7) concentrates, in particular directs, the airflow conveyed by a fan radially inwards.

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