EP1430491A1 - Planar transformer comprising plug-in secondary windings - Google Patents

Planar transformer comprising plug-in secondary windings

Info

Publication number
EP1430491A1
EP1430491A1 EP20020760033 EP02760033A EP1430491A1 EP 1430491 A1 EP1430491 A1 EP 1430491A1 EP 20020760033 EP20020760033 EP 20020760033 EP 02760033 A EP02760033 A EP 02760033A EP 1430491 A1 EP1430491 A1 EP 1430491A1
Authority
EP
European Patent Office
Prior art keywords
winding
planar transformer
characterized
coil
transformer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20020760033
Other languages
German (de)
French (fr)
Other versions
EP1430491B1 (en
Inventor
Joachim Peck
Jürgen PILNIAK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DET International Holding Ltd
Original Assignee
Delta Energy Systems Switzerland AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE10148133 priority Critical
Priority to DE2001148133 priority patent/DE10148133A1/en
Application filed by Delta Energy Systems Switzerland AG filed Critical Delta Energy Systems Switzerland AG
Priority to PCT/CH2002/000536 priority patent/WO2003030189A1/en
Publication of EP1430491A1 publication Critical patent/EP1430491A1/en
Application granted granted Critical
Publication of EP1430491B1 publication Critical patent/EP1430491B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/2847Sheets; Strips

Abstract

The invention aims to prevent the disadvantages of printed circuit board transformers with respect to their quality and safety, in particular in a performance range of greater than 150 VA with output voltages of less than 12 V. This is achieved by a planar transformer comprising a ferrite core (1a, 1b, 21a, 21b), at least one primary coil and at least one secondary coil, which can be connected on a printed circuit board and a coil body (3, 23), which encompasses part of the ferrite core (1a, 1b, 21a, 21b) and carries at least one secondary coil. According to the invention, each of the secondary coils (3, 23) carried by the coil body is configured from at least one winding metal sheet (2, 22), which is open on one side and can be plugged into the coil body (3, 23) and connected to the printed circuit board.

Description

"The planar transformer with inserted secondary windings"

The invention relates to a flat transformer with a ferrite core, at least one primary coil and at least one secondary coil, which can be connected on a circuit board, and a coil body, which surrounds a portion of the ferrite core and carrying at least one secondary coil.

With increasing demands on the volumetric power density (VA / in 3) of a pulsed power supply and the demands on their inductive components, in particular on the or the main transformers. Therefore, PCB transformers in all conceivable types of construction, as a separate component or in the motherboard of a power supply, are increasingly being used for about 20 years integrated.

An example of such a PCB transformer is known from US 5,010,314. Its primary and secondary coils are etched on circuit cards, which have a recess at its center, so that the boards can be stacked plugged onto the ferrite core of the transformer, wherein an insulating layer is provided between adjacent printed circuit boards. The printed circuit cards are held together by a two-halves bobbin, said circuit card is positioned between the two halves of the primary coil and the secondary windings are arranged at the opposite sides of the halves of the bobbin. All printed circuit boards be of webs which circulate on both sides of the halves of the bobbin, comprising. The ferrite core consists of two E-shaped halves, with which the printed circuit boards plugged carrying bobbins on the central web of one of the halves of the ferrite core and the other half of the ferrite core is placed from the other side of the bobbin.

This type of circuit card technology is used primarily for signal transformers, chokes and transformers in the power range up to about 150 VA.

In the power range over 150 VA at outputs with low voltages (<12V) and correspondingly high output currents to considerable quality problems in the production of PCB transformers result. Thus, the copper thickness of the boards at high currents must be correspondingly large and no longer meets the standard of PCB industry.

At high output levels relatively expensive circuit boards with special thicknesses are required, any existing standard copper thicknesses must be copper-plated. PCBs are used with special of copper thicknesses, the etched gap between tracks is required to guarantee with optimal process settings. Even the smallest variations in the process or impurities cause tiny little copper bridges between the tracks. Such a bridge between two conductor paths results in a too small number of windings to a Windungskurzschluß or a conductive connection between conductor track and the outer edge towards even safety clearances between the windings or between winding and a ferrite core. Such a conductive connection between two conductor tracks can be detected during the PCB manufacturing only directly after each process step by complicated measurement method, or it is detected only during the final functional test of the completely assembled transformer. The value, however, is nullified and much of the material used can not be reused.

Alternatively, a plurality of thin copper layers of multilayer printed circuit boards can be connected in parallel. However, the total thickness of such printed circuit board because of the insulating layers between the conductor layers is comparatively high. Also there is the disadvantage that the exact connecting the parallel conductive layers in the PCB-consuming and subject to compliance with specified safety standards is only possible with concealed by climbers.

Another problem, especially for stationary PCB transformers that mechanically stable and solid stream contacting the circuit board with all the required inner layers of the printed circuit board such as a motherboard power supply, represents.

The object of the invention is to provide a flat transformer in which the aforementioned disadvantages do not exist.

This object is achieved with a flat transformer of the type mentioned above in that each of the secondary coils carried by the coil former is formed by at least one open on one side winding sheet, which can be plugged and can be connected to the circuit board on the bobbin.

A basic idea of ​​the invention is to dispense with circuit cards and their limitation to the thickness of the conductor layer entirely, and to use a conductor plate, instead, that is designed as a winding, and can be plugged onto the ferrite core. The coil plate is then connected directly to the printed circuit board, for example, on the motherboard of the power supply unit. As a result, the winding carries due to a sufficient rigidity of the conductor plate itself, while PCB transformers, the windings are all applied to a substrate and are held by this, the substrate must be contacted with the motherboard in addition itself, for example by angle connector or bus bar, and the terminal pins have to be mechanically stabilized.

Through the use of simple winding sheets as secondary windings, which are connected directly via a circuit board, instead of printed circuit cards, in which conductor layers one or more windings are etched and which are interconnected via terminal bars and connected to the circuit board, there are unexpected number of advantages over the above- PCB transformers described.

First, the design and production of such flat transformers is independent of standard circuit boards and their copper thicknesses. Since no circuit boards with special copper thicknesses are no longer required, the production cost of the planar transformer can be significantly reduced, and that the time to a quarter of the cost of comparable PCB transformers or even lower. For the same reason there is no problem regarding the availability of good-quality printed circuit boards.

The production of such PCB transformers is simplified, as they are standard manufacturable against PCB transformers with relatively little effort almost everywhere and, in particular, there are no single-source dependencies of manufacturers of printed circuit boards with special conductor layer thickness.

On the other hand account for all the disadvantages with regard to possible qualitative impairments of circuit boards in a non-precision manufacture. security-related risks, such as insufficient separation of the primary and secondary coils also can be safely excluded from each other due to possible creepage distances and clearances for air inclusions or impurities which exist in printed circuit cards.

A further considerable advantage consists in that the inserted and / or soldered to the circuit board of a device terminals of the or of the winding sheets serve as mechanical fixing, so that an additional gluing, stapling, bolting the planar transformer on the device or on the circuit board is not required is.

Furthermore, the planar transformer according to the invention in terms of its environmental performance over PCB transformers considerable advantages. So fall in the method for producing printed circuit cards, unlike in the manufacture of winding sheets to a considerable extent on waste and there is a large amount of energy required. In addition, in the manufacture of printed circuit boards in special thickness, the rejection rate is high due to quality defects, while the metal conductor elements are extremely easy to manufacture, where they are punched out, for example, from a full-surface conductor material, so that the rejection rate is comparatively low in the production of winding sheets , Furthermore, the planar transformer according to the invention can be better recycle because it is easy to remove and less composite materials are used, which is especially important in light of imminent electronic waste regulations, is where to expect that manufacturers will be obliged to take back the delivered device.

As a result, there is provided an opposite PCB transformers technically similar, but considerably cheaper solution available with the inventive planar transformer in particular for use in the power range of about 150 - can be used 400VA.

In a particular embodiment, the planar transformer according to the invention at least two winding sheets on the circuit board to a secondary coil are connected together. It is possible to equip the planar transformer according to the invention with a plurality of individual winding sheets, which are interconnected via the printed circuit boards either to a high-current winding or several high-current windings with the same or mutually different number of windings on the printed circuit board. When the connection of the individual winding sheets via a driver or one or more relay is controlled so that either single winding sheets of the or one of the secondary coils can be connected or disconnected, it is even possible to use a provided with several winding sheets flat transformer flexible ,. Also can be shortly realized samples, prototypes and small series with modified or adapted turns based on the principle of the flat transformer according to the invention over comparable PCB transformers, development time can thus be shortened. If an inventive planar transformer equipped with two winding sheets, they may be arranged on both sides of the primary coil, whereby a sufficient insulation must be provided between the secondary windings and the primary coil. If a plurality of winding sheets arranged next to one another, they can either be coated in each case with an insulating layer, or it is preferably arranged an insulating intermediate layer between two adjacent winding sheets. The latter version is advantageous when the respective winding sheet consists solely of a conductive material and can be recycled more easily.

punched or eroded copper sheets are preferred as the winding sheets used. Copper is a preferred conductor material that can be easily processed. The winding sheets are preferred - particularly in the area of ​​their connection ends - tin plated, so that the sheets soldered simple and can be stored better.

Further, the coil body of the planar transformer according to the invention to a guide for at least one of the winding sheets into which the sheet metal coil is inserted. Thereby, the winding sheet is fixed in position to the ferrite core, so that no quality or safety losses due to wrong inserted winding sheets. For the same purpose, at least one of the winding sheets and / or at least one of the insulating intermediate layers may have a recess, which cooperates with a latching lug of the bobbin. Another possibility of fixing of winding sheets consists, for example, that the circuit board slot-shaped receptacles, into which the winding sheets can be used and are thus fixed equally.

In a further preferred embodiment of the planar transformer of the coil bobbin has a winding chamber for the primary coil, the primary coil may be formed from one or more wound conductor wires. While it is possible in principle, similar to the PCB transformers to arrange the primary coil on a circuit board and be placed between two halves of a bobbin. If one wants to do completely without PCBs, this preferred embodiment offers, the bobbin may then be in one piece, designed for example as an injection molding from a suitable insulating plastic. In this case, the coil body has a coat on the coated part of the ferrite core, and two vertically projecting to the central axis of the shell to the outside, perimeter walls. The conductor wire can be wound between the walls on the mantle then, during the winding for the secondary winding sheets are placed on the side opposite to the winding side of the chamber walls. The width and height of the winding chamber formed by the casing and the walls can be adjusted such that for a given wire diameter, a uniform winding structure with a constant number of turns per layer, and - in mass-produced transformers - a constant number of layers is reached and the winding chamber is optimally filled.

A particular advantage of this embodiment is that a secure primary-secondary separation is always guaranteed, as provided by the construction of the coil bobbin, when installed correctly, the required distance between the primary and Sekuπdärspule (s) can never be exceeded. The required approvals for various clearances and creepage distances between the primary and secondary windings (mostly> 6.4mm) are far exceeded (thickness of the walls), depending on the configuration of the Spritzugßkörpers. A further considerable advantage is that with the use of a coiled wire conductors may be omitted entirely as the primary winding on circuit cards within the planar transformer, so that, depending on the material used are possible for the coil bobbin higher operating temperature. In contrast, with PCB transformers is the max. Operating temperature is limited by the Tg (glass transition point) of the carrier material and a corresponding admission of PCB transformers to about 130 ° C.

In a further refinement of this embodiment of the bobbin are each primary coil at least two receptacles for terminal pins, to which the beginning and the end of at least one conductor wire are connected to a primary märspulenwicklung provided. The advantage is in ease of manufacture, the ends of the primary coils may be first soldered to the pins, before the flat transformer is simply placed with the inherently rigid pins on the printed circuit board and the terminal pins are soldered to the printed circuit board.

The bobbin can be advantageously configured in addition with at least one from the bottom of the winding chamber to one of the terminal pins, running obliquely to the axis of the wire guide groove Aπschlußstiftes. This is on the one hand achieved that the windings of one layer may completely flat and parallel to each other rest on the bottom of the winding chamber, without that these windings must be led terdrahtes to the tail of the managerial or one of the windings resting on that end. Thus, a pressure relief of the windings of all winding layers is achieved since each winding lies exactly on the winding of the underlying layer. On the other strain relief of the end of the conductor wire to the terminal pin in the winding of the primary coil is reliably ensured with the wire guide groove.

As mentioned earlier, the bobbin is preferably in one piece, in particular as an injection molded part is formed.

The planar transformer of the present invention is preferably formed with a ferrite core, which is composed of two E-shaped core halves, wherein the coil body sits on the middle of the three mutually parallel webs core. It may be formed with an ETD, EFD, ELP or PQ core particular. It is also possible for the flat transformer instead of such a doubly closed ferrite core, with a simple closed ferrite core (U-core) to be formed, wherein the primary coil (s) on one leg and the plug-in winding sheets of the secondary coil (s) on the other limb sit. but there are also versions in principle conceivable in which the planar transformer is formed with a ring core. In this case, it would offer, for example, two-piece form the bobbin such that each portion comprises a casing half, said casing halves are assembled to form a jacket around the ring core.

The invention is based on figures which preferred embodiments of the planar transformer according to the invention, show explained. Show it

Fig. 1 is an exploded view of a first preferred exporting approximate shape of the planar transformer,

Fig. 2 is an isometric bottom view of the flat transformer shown in Figure 1 with inserted winding sheets,

Fig. 3 is an exploded view of a second preferred embodiment of the planar transformer, and

Fig. 4 is an isometric bottom view of the flat transformer shown in Figure 3 with the inserted winding sheets.

1 shows essential components of an embodiment of the planar transformer according to the invention, namely a two halves la, lb, three-legged ferrite core, two a secondary coil constituting the winding sheets 2 and a coil former 3. The primary winding is not shown for clearer illustration.

The winding sheets 2 consist of a conductive material and are preferably stamped from a copper sheet or eroded and are tinned. They have a substantially U-shaped, that is to one side open, profile. The upper leg 4 of the U-shaped profile has a small rectangular notch 5 substantially at the center of the outer edge. At both ends of the web is free leg 6 7 close to.

The thickness of the winding sheets 2 is small compared to the width of their webs 4 and the leg 6, seventh The width of a predominant part of the legs 6, 7 substantially corresponds to the width of the web 4 in the region of the notch 5. The free ends of the legs 6, 7 are as soldering or plug-in contacts 8, 9 are formed with a width slightly less than half as is large as that of the majority of the legs 6, 7. the ends may also be designed as insulation-displacement contacts by being chamfered.

The coil bobbin 3 is a one-piece injection-molded part with a Mantelflä- before 10 enclosing the central leg of the ferrite core in the mounted state of the flat transformer. Onto the outer surface 10, two close perpendicular thereto and extending in the circumferential direction of the walls 11, 12 which together with the circumferential surface 10 in a circumferential direction outwardly open roll chamber 13 for the primary coil. Width and height of the winding chamber are coordinated so that achieved with a selected wire diameter of the lead wire for the primary coil, a uniform winding structure with a constant number of conductors per winding location and the chamber may be filled optimally. This makes it possible to optimize the winding structure of the primary coil in electric and magnetic aspects, particularly with regard to skin and proximity effects.

On each of the walls 11, 12 are on their side facing away to the winding chamber 13 side of each free legs 6, 7 of the winding sheets 2 each two lateral guide slots 14a, 14b, 14c, 14d, whereby the arranged at the outer edge of the walls 11, 12 guide slots 14a, 14d of the outer edges of the legs 6, 7 of the winding sheets over the entire edge length of the walls 11, 12 extend and the guide slots 14b, 14c for the inner edges of the free legs 6, 7 of the upper lateral surface 10 to the lower edge of the bobbin 3 extend. In addition to the two outer sides of the walls 11, 12 an impact ridge 15 is formed on the inner side of the webs 4 of the winding sheets 2 and at the upper edges of the walls 11, 12 in the center a locking tab 16a, 16b on the upper peripheral surface 10, so that the , 16b are completely fixed at the outer sides of the walls 11, 12 inserted into the bobbin 3 winding sheets 2 through the guide slots 14a, 14b, 14c, 14d, the abutting edges 15 and cooperating with the notches 5 detents 16a, with the solder or plug-in contacts 8, 9 of the winding sheets 2 on the lower edge of the bobbin 3 protrude. This fixation is ensured that always a defined distance from the later inserted ferrite core la, lb is what is imperative to comply with existing safety and licensing requirements. At the same time, a sufficiently large surface portion of the winding sheets 2 is directly detected by the forced air current of the device, so that a sufficient cooling of the transformer can be ensured.

As well as Figure 2, in which the planar transformer with inserted winding plates 7 in bottom view shown can be inferred in particular, the walls 11, thickened 12 in its lower region between the guide slots 14a, 14b and 14c, 14d of the inner leg edges formed and have at least one downwardly open hole as a receptacle for the terminal pins 17a, 17b that have a square cross-section for connecting the ends of the primary windings respectively. The diameter of the holes is slightly smaller than the cross-sectional diagonal of the terminal pins 17a, 17b, so that the terminal pins 17a, must be pressed into the bores 17b and are sufficiently fixed due to the interference fit. The pressed into the bores connecting pins 17a, 17b are provided in about the same distance beyond the lower edge of the coil former 3 via the solder or as plug-in contacts 8,. 9

In one of the thickened portions formed of the walls 11, 12 is a to the axis of the terminal pins 17a, 17b extending obliquely, to open the bottom wire guide groove 18 by the pin 17b to the winding chamber 13 is provided. By this wire guide groove 18, an unnecessary mechanical pressure on the wire of the winding beginning by the following turns is avoided, which could possibly result in adjacent high primary voltages may flashovers and Windungskurzschlüssen in the coil in operation.

For the joining of the flat transformer shown, the bobbin 3 is first fitted to the terminal pins 17th After pressing in the pins 17 the desired number of turns of the primary winding is wound in a conventional manner using a winding machine in the winding chamber 13 of the bobbin. 3 Depending on insulation requirements the device, the lead wire for the primary winding can be configured for example as a mono- or poly-insulated copper wire or round as nylon-braided litz. For winding the beginning of the lead wire is stripped of the primary coil in the required length and wound around one of the terminal pins 17th From this pin 17 from the lead wire is guided by the inclined wire guide groove to the bottom of the winding chamber 13, wound in the winding chamber for the primary coil and then fed the corresponding stripped portion of the conductor wire to the other terminal pin and is wound therearound. Thereafter, the terminal pins 17 are soldered to the stripped wire ends, for example by dipping Schwallötbecken. After the soldering of the winding sheets 2 as secondary windings in the guide slots 14a, 14b, 14c, 14d are inserted on both sides of the winding chamber. 13 Upon insertion the winding sheets 2 have in the detents 16a, 16b engage the bobbin 3 to prevent subsequent sliding back of the winding sheets 2, for example during transport or during assembly of the entire transformer on a circuit board. Finally, the two ferrite core halves la, lb are inserted with their center legs on both sides in the bobbin 3 and bonded together. Alternatively, the ferrite core halves la, lb with clips or a wound around the entire ferrite core tape can be held together.

The composite thus flat transformer can then be mounted on a not shown circuit board and soldered on this. The circuit board is formed so that the winding sheets 2 are then connected together as a secondary coil.

Finally done, the function and safety testing of the complete transformer.

3 shows essential components of another preferred embodiment of the planar transformer according to the invention are shown. It comprises a two halves 21a, 21b, dreischenk- time ferrite core, four winding sheets 22, which may be combined into one or more secondary windings through an unillustrated printed circuit board, and a bobbin 23. PCB and primary winding are not shown here for better presentation. The coil laminations 22 are different to those of the previously described embodiment in that each winding plate 22 are formed of four mutually perpendicular webs 24, 25, 26, 27 the same width, the lower web 27 is not continuous but broken through towards one side , On both sides of the opening 28des lower bridge 27 close to the lower web 27 downwardly soldering or plug-in contacts 29, 30, where one of the soldering or plug-in contacts 29 is located in the center of the lower edge of the sheet winding 22nd

In addition, two insulating sheets 31 are provided, the profile are formed by four circumferential ridges which are slightly wider than the lands of the winding sheets 22, so that two winding sheets 22 between which such an insulating sheet 31 are arranged, are completely electrically isolated from each other. At its upper edge, the insulating layers each have a notch 32nd

Also in this embodiment, the bobbin 23 is a one-piece injection-molded part with an outer surface 33, enclosing the central leg of the ferrite core in the mounted state of the flat transformer. Onto the outer surface 33 close two perpendicular thereto and extending in the circumferential direction of the walls 34, 35, which together with the circumferential surface in a circumferential direction outwardly open winding chamber 36th Width and height of the winding chamber 36 are coordinated so that at a selected wire diameter, a uniform winding structure with a constant number of conductors per position is reached and the winding chamber can be optimally filled 36th On each of the walls 34, 35 a guide frame for winding sheets 22 is at its side facing away to the winding chamber 36 side is provided, the guide slots 37a, 37b for the outer edges of the lateral webs 24, 26 of the winding sheets 22, which extends over the entire edge length of the walls 34, extend 35, and a lower web

38, which forms an abutment edge for the lower edge of the inserted into the guide slots 37a, 37b winding sheets 22nd The guide slots 37a, 37b are dimensioned so that two winding sheets 22 between which an insulating layer 31 is disposed can be inserted. The lower web 38 of the guide frame has openings

39, 40, 41 for the passage of solder or plug contacts 29, 30 of the winding sheets 22, wherein a central breakthrough 40 is provided by which the two central soldering or plug-in contacts 29 of both adjacent winding sheets can be inserted, and both sides of the central opening two further openings 39, 41 are provided for each of the other plug contact 30 of the winding sheets 22nd

35 centrally a latching lug 42a, 42b as in the embodiment described above is at the upper edges of the walls 34 is formed. Two winding sheets 22 are stacked together with an intermediate insulating layer 31 such that the central solder or plug contacts 29 adjacent to each other and the lateral soldering or plug-in contacts 30 to respective different sides of the central Lötbzw. Plug contacts 29 are, they can be inserted into the guide frame, so that it from the lead frame and the latching lug 42a, 42b are completely fixed in position on the bobbin 23rd On the outer edge of a respective one of the guide slots 37a of the guide frame extending - as, in particular, figure 4 refer leaves - each in the direction of the roll chamber away receiving blocks 43a, 43b, 44a with holes for receiving two respective terminal pins 45a, 44b, 45b for two separate primary coil windings. The underside of the blocks 43 close off the lower edge of the bobbin 23rd The terminal pins inserted into the holes 44a, 45a, 44b, 45b are provided in about the same distance beyond the lower edge of the bobbin 23 about how the set-through through the apertures 39, 40, 41 of the guide frame soldering or plug-in contacts 29, 30th

From the position shown in figure 4 bottom view of the planar transformer with windings inserted apparent that also wire guiding grooves 46a, 46b extend from the winding chamber 36 towards the bottom of the wall. The or the ends of the conductor wire or conductor wires of one or more primary coils may here on the bottom of the winding chamber 36 away over the bottoms of the receiving blocks 43a, 43b, one of the terminal pins 44a, 45a, 44b, 45b or to both pins 44a, 45a 44b, 45b are made of a receiving block 43a, 43b.

At the bottom of the bobbin four positioning feet 47a, 47b, 47c, 47d protrude, which can be used for positioning of the fully assembled planar transformer on a printed circuit board when these are provided on corresponding recesses.

This embodiment of the planar transformer according to the invention is just as assembled as the previously described embodiment, with the exception of the other kind of the plug, the winding sheets 22, together with insulation layer 31 in the guide frame and the possibility of having two primary windings in the winding chamber winding 22 and to connect to the terminal pins 44, 45th

For both embodiments, that the connections of the plates have to be interconnected to the mother board of the device by conductor tracks according to obtain the desired for the particular topology of the circuit turns, for example, on the secondary side a winding number of 1 or 2 with a two sheet variant or 2 or 4 possible in a four plates variants of this invention.

The conditionally wide by high secondary currents and thick traces to the winding sheets also provide nor for heat removal from the transformer, In addition, results from the 4, 8 or solder joints (start and end of each winding plate), an extremely stable connection between the transformer and the main circuit card of the device. Other fixtures are not required.

Claims

claims
1. A planar transformer comprising a ferrite core (la, lb, 21a, 21b), at least one primary coil and at least one secondary coil, which can be connected on a circuit board, and a coil former (3, 23) (a portion of the ferrite core la, lb, 21a, 21b) encloses and the at least one secondary coil carries, characterized in that each of the (from the bobbin 3, 23) carried by the secondary coils by at least one open on one side winding sheet (2, 22) is formed, which (on the bobbin 3, 23) can be plugged and can be connected to the circuit board.
2. A planar transformer according to claim 1, characterized in that at least two winding sheets (2, 22) are connected together via the circuit board to a secondary coil.
3. A planar transformer according to claim 2, characterized in that between two on the coil former (3, 23) arranged side by side winding sheets (2, 22), an insulating intermediate layer (31) is arranged.
4. A planar transformer according to one of claims 1 to 3, characterized in that the winding sheets (2, 22) punched or eroded copper sheets are.
5. A planar transformer according to claim 4, characterized in that the winding sheets (2, 22) are tin-plated.
6. A planar transformer according to one of claims 1 to 5, characterized in that the coil former (3, 23) for at least one of the winding sheets (2, 22) has a guide, is inserted into the winding sheet (2, 22).
7. A planar transformer according to claim 6, characterized in that at least one of the winding sheets (2, 22) and / or at least one of the insulating intermediate layers (31) has a notch (5, 32), which (with a latching lug 16a, 16b, 42a , 42b) cooperating of the bobbin (3, 23).
8. A planar transformer according to one of claims 1 to 7, characterized in that the coil former (3, 23) a winding chamber (13, 36) for the primary coil and the primary coil of at least one wound conductor wire.
9. A planar transformer according to claim 8, characterized in that the coil former (3, 23) at least two receptacles for terminal pins (17, 44, 45) to which the beginning and the end are connected at least one conductor wire having.
10. A planar transformer according to claim 9, characterized by at least one from the bottom of the winding chamber (13, 36) to at least one of the terminal pins (17, 44, 45) and to the axis of this terminal pin (17, 44, 45) inclined wire guide groove.
11. A planar transformer according to one of claims 1 to 10, characterized in that the coil former (3, 23) is one piece.
2. A planar transformer according to one of claims 1 to 11, characterized in that the ferrite core consists of two E-shaped core halves (la, lb, 21a, 21b) is composed and the bobbin (3, 23) on the middle of the three mutually parallel core webs sitting.
EP20020760033 2001-09-28 2002-09-26 Planar transformer comprising plug-in secondary windings Active EP1430491B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10148133 2001-09-28
DE2001148133 DE10148133A1 (en) 2001-09-28 2001-09-28 Flat transformer with inserted secondary windings
PCT/CH2002/000536 WO2003030189A1 (en) 2001-09-28 2002-09-26 Planar transformer comprising plug-in secondary windings

Publications (2)

Publication Number Publication Date
EP1430491A1 true EP1430491A1 (en) 2004-06-23
EP1430491B1 EP1430491B1 (en) 2006-01-04

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EP20020760033 Active EP1430491B1 (en) 2001-09-28 2002-09-26 Planar transformer comprising plug-in secondary windings

Country Status (4)

Country Link
US (1) US7091817B2 (en)
EP (1) EP1430491B1 (en)
DE (2) DE10148133A1 (en)
WO (1) WO2003030189A1 (en)

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US7091817B2 (en) 2006-08-15
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DE50205532D1 (en) 2006-03-30
DE10148133A1 (en) 2003-04-24

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