JP4374620B2 - Transformer structure - Google Patents

Description

  The present invention relates to a transformer structure in which a primary winding and a secondary winding are wound around a core and an output can be freely taken out.

  As a conventional transformer structure, there is an inductance element disclosed in Patent Document 1. FIG. 17 specifically illustrates this. 101 is a transformer for transmitting power from the input side to the output side of the power supply device. This transformer includes a core 102 made of a magnetic member, and an electromagnetic wave on the core 102. A plurality of primary windings 103 and secondary windings 104 that are coupled to each other. The core 102 includes a first core member 105 having an E-shaped cross section and a second core member 106 having a I-shaped cross section. Reference numeral 107 denotes a synthetic resin core holder that accommodates and holds the core 102, and an elastic piece 110 that fits into the hole 109 of the printed circuit board 108 is integrally provided at the bottom thereof. The core 102 has a main leg 111 having a cylindrical shape at the center and a pair of side legs 112 on both sides of the main leg 111, and a first upper surface of the main leg 111 and the side leg 112 is formed. By closing the flat second core member 106 on the mating surface 113 of the core member 105, a closed magnetic circuit is formed. On the other hand, the primary winding 103 is composed of a disc-shaped bobbin body 114 made of synthetic resin and a wire rod 115 wound around the bobbin body 114, and the wire rod 115 expands radially between a pair of flanges 116. It is wound in a spiral shape with a diameter. The secondary winding 104 is configured by covering the conductive member 118 with a film-like insulating layer 119, and the base end portion of each secondary winding 104 is connected and fixed to an independent output side module (not shown). Is done.

  In manufacturing, a primary winding 103 in which a wire 115 is wound around a bobbin body 114 is prepared in advance, and both ends of the wire 115 of the primary winding 103 are soldered to predetermined positions on the printed circuit board 108 to both electrical Connect. Further, the elastic piece 110 of the core holder 107 is fitted into the hole 109 of the printed circuit board 108, and the core holder 107 is attached and fixed on the printed circuit board 108. Next, the printed circuit board 108 with the primary winding 103 and the core holder 107 is screwed in a state where a space (not shown) is interposed in a metal plate member 121 arranged to face the printed circuit board 108. . Through these operations, the printed board 108 and the core holder 107 of the transformer 101 are positioned and fixed with respect to the plate member 121, respectively.

Next, the process proceeds to a substantial manufacturing process of the transformer 101. First, the first core member 105 is accommodated in the core holder 107 with the mating surface 113 facing upward, and the primary winding 103 and the secondary winding 104 that are mechanically independent from each other are used as the main legs 111 of the core 102. Install sequentially. Then, the abutting surfaces 113 of the first core member 105 are aligned with the second core member 106, and both end portions of the elastic stopper 122 are locked to the upper portions on both sides of the core holder 107, so that all the components (cores) of the transformer 101 are 102, the primary winding 103 and the secondary winding 104) are accommodated and held in the core holder 107.
JP 2003-68532 A

  However, the conventional transformer structure has a problem that it cannot flexibly cope with various output voltage specifications required by the user. As general output voltage specifications required by the user, there are various output voltage specifications such as 5V system, 12V system, 24V system, 48V system, and the like. In the conventional transformer structure, in order to change the output voltage specification, it is necessary to rewind the primary winding 103 and the secondary winding 104 through a second winding process. A plurality of types of transformers with different output voltage specifications were prepared and manufactured in advance so that the turns ratio with the wire 104 conforms to these output voltage specifications. Therefore, various kinds of transformers have to be managed in manufacturing factories and dealers, and there is a problem that production management and inventory management become complicated. On the user side, once purchased transformers can only be used with the same output voltage specifications, so if there is a change in the specifications of the device, it will be necessary to purchase a transformer with a different specification, or divert it to another device It was uneconomical.

  In view of the above problems, an object of the present invention is to provide a transformer structure in which the turn ratio can be freely changed in accordance with user's required specifications afterwards.

A transformer structure according to claim 1 of the present invention includes a base having an insulating property, Ri Na by winding a conductor, a plurality of windings body having a first winding body and the second winding body outermost , Electrically connecting a core member that magnetically couples these winding bodies, and one arbitrarily selected from a start end portion, a termination end portion, and an external wiring of the winding body attached to the pedestal; It is composed of a detachable connector, and the connector connects all the start ends of the plurality of winding bodies and the external wiring, and all the end portions of the plurality of winding bodies and the external wiring, respectively. A first connector having one turn of the entire winding body, a starting end portion of the first winding body and the external wiring, a terminal end portion of the second winding body and the external wiring, and One end of the adjacent winding body between the first winding body and the second winding body The starting end of the other of the winding body and respectively connected, characterized by comprising attached to either of the second connector to the number of turns of the whole winding body 2 turns or more.

The transformer structure according to claim 2 of the present invention, the bobbin having a base and a winding portion made by combining split bobbin, Ri Na by winding a conductor, a first winding body and the second winding to the outermost A plurality of winding bodies having wire bodies, a core member that magnetically couples these winding bodies, a start end portion and a termination portion of the winding body wound around the winding portion, and external wiring It is composed of a detachable coupling that electrically connects arbitrarily selected ones, and the coupling includes all the start ends of the plurality of winding bodies, the external wiring, and the plurality of winding bodies. All of the terminal ends of the winding body and the external wiring are connected to each other, and the first winding body has a turn of one turn, the starting end of the first winding body, the external wiring, and the second wiring. Between the terminal end of the winding body and the external wiring, and between the first winding body and the second winding body. One of the second couplings that connects the end portion of the adjacent one of the winding bodies and the start end portion of the other winding body, and makes the number of turns of the whole winding body two turns or more is attached. to become Te said.

If it does in this way, it will consist of a plurality of winding bodies only by changing the connection tool prepared beforehand so that it may become various connection forms like the 1st connection tool and the 2nd connection tool. The number of turns of the entire winding body on the primary side or secondary side can be freely changed, so the turn ratio between the primary side winding body and the secondary side winding body is set so as to achieve the desired output voltage specification. By adjusting, an arbitrary output can be taken out from the secondary winding body.

  In a transformer structure according to a third aspect of the present invention, a mounting portion capable of mounting a component is provided in the connector.

  In this way, by using the connector as circuit wiring, the circuit wiring can be shortened as much as possible, and a circuit can be formed without using a substrate for mounting components.

  In the transformer structure according to a fourth aspect of the present invention, the pedestal is provided with a connecting portion to which the starting end portion or the terminal end portion is connected, and a mounting portion capable of energizing the connecting portion and mounting a component.

  In this case, by using the pedestal constituting the transformer as a substrate for mounting components, the circuit wiring can be shortened as much as possible, and a circuit can be formed without using the substrate.

  In the transformer structure according to a fifth aspect of the present invention, the pedestal is provided with an auxiliary terminal for connecting a start end portion and a terminal end portion of the winding body.

  In this way, a plurality of outputs can be taken out from the winding body.

  In a transformer structure according to a sixth aspect of the present invention, there is provided routing means for routing a part of the winding body away from the main body.

  If it does in this way, external parts, such as EMI countermeasure parts, can be easily attached to the winding body concerned, for example.

  In the transformer structure according to the seventh aspect of the present invention, another transformer is constituted by a winding body that is drawn away from the main body.

  If it does in this way, another transformers, such as a current transformer, can be added to this transformer structure using the winding object concerned, for example.

  According to the first and second aspects of the present invention, it is possible to provide a transformer structure capable of freely changing the turns ratio between the primary side and the secondary side according to the user's required specifications afterwards.

  According to the third aspect of the present invention, it is possible to reduce the number of components by enabling components to be mounted on the coupler, and it is possible to reduce the noise and heat loss by shortening the wiring pattern as much as possible. .

  According to the fourth aspect of the present invention, components can be mounted on the pedestal, so that the number of components can be reduced and the wiring pattern can be shortened as much as possible to reduce noise and heat loss.

  According to claim 5 of the present invention, a transformer structure with other outputs can be obtained.

  According to the sixth aspect of the present invention, the external part can be easily attached.

  According to claim 7 of the present invention, another transformer can be added to the transformer structure.

  Hereinafter, preferred embodiments of the transformer structure in the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same location as a prior art example, and since description of a common part overlaps, it abbreviate | omits as much as possible.

  FIG. 1 is an exploded perspective view of the transformer structure in the first embodiment, but the wire 115 constituting the primary winding 30 is omitted. The transformer 1 mainly includes a primary winding 30 as a primary winding body, a secondary winding 25 as a secondary winding body, and a combination of the primary winding 30 and the secondary winding 25. The pedestal 2 for mounting the assembly 45, the connecting metal fitting 40 attached to the pedestal 2, and the core 102 as a core member made of a magnetic member are included. The connection fitting 40 and the winding assembly 45 will be described later.

  The primary winding 30 is formed by winding a wire 115 around a cylindrical bobbin body 31 made of, for example, resin having a through hole 36. The bobbin body 31 is formed with annular plate-like flanges 32 and 33 at both ends so that the wire 115 does not slip out and fall off. The flange 33 is not a complete annular shape, and a part of the flange 33 is rectangular. A pair of notches 34 and 34 are formed symmetrically with each other at both ends in the longitudinal direction of the rectangular part. Since the flange 32 is formed slightly below the upper end edge of the bobbin body 31, the upper end of the bobbin body 31 is an annular protrusion 35 protruding from the flange 32. The annular protrusion 35 is provided as a fitting portion for connecting a plurality of bobbin bodies 31, and correspondingly recessed fittings that are recessed in steps on the inner periphery of the lower end of the bobbin body 31 on which the flange 33 is formed. A portion 37 is formed.

  The secondary winding 25 is made of, for example, a plate-like member such as aluminum, and a non-continuous annular winding portion 26 lacking a part, and a pair of legs serving as a start end portion or a termination portion of the secondary winding 25 It consists of parts 28 and 28. The leg portions 28 and 28 extend in one radial direction from both ends of the winding portion 26 so as to be parallel and linear to each other. Note that the center hole 27 of the winding portion 26 is large enough to fit the annular projection 35 of the bobbin body 31.

  The pedestal 2 is composed of a rectangular support portion 3 whose central portion swells in a circular shape and a wiring base 4, and is integrally formed with, for example, a resin or the like so as to be orthogonal to form an L shape. The support portion 3 is a ring-shaped plate-like placement portion 5 on which the winding assembly 45 is placed, and a rectangular parallelepiped mounting leg portion that is mounted on a substrate (not shown) by soldering or the like and supports the base 2 and thus the transformer 1 as a whole. 8 and 9. The mounting portion 5 has the same configuration as that obtained by separating the upper portion from the flange 32 of the primary winding 30, and an annular projection 7 surrounding the periphery of the through hole 6 in a wall shape is formed at the center portion thereof. Has been. The mounting legs 8 and 9 are integrally formed with the mounting portion 5 so as to be flush with each other at positions opposite to both sides of the mounting portion 5, and mounting terminals 12, 12, Mounting terminals 11 and 11 project from the bottom surface of the mounting leg 9. Further, on the side surface of the mounting leg portion 9, connection terminals 10 and 10 as a pair of connection portions are provided so as to protrude in the longitudinal direction from the tip of the support portion 3. The connection terminals 10 and 10 are connected to the mounting terminals 11 and 11 inside the mounting leg 9 so that the connection terminals 10 and 10 and the mounting terminals 11 and 11 are energized. Since the mounting terminals 11 and 11 are soldered and connected to the substrate, the end portions 115a and 115a serving as the start end portion or the end portion of the wire rod 115 constituting the primary winding 30 are connected to the connection terminals 10 and 10 by soldering in advance. If the base 2 is mounted on the board, the electrical connection between the board and the primary winding 30 is naturally achieved. This eliminates the trouble on the user side of separately soldering and connecting the wire 115 to the board. This saves the mounting work of the transformer 1.

  The wiring base 4 has a rectangular flat plate shape and is erected vertically from the upper end portion of the mounting leg portion 8 of the support portion 3. The wiring base 4 has a plurality of holes such as a secondary winding insertion hole 20, a wiring connection hole 21, and a metal fitting mounting hole 22. The secondary winding insertion hole 20 is a long hole into which the leg portion 28 of the secondary winding 25 can be inserted, and a pair of secondary winding insertion holes 20 and 20 corresponding to the distance between the leg portions 28 and 28 is a transformer. 1 are arranged in parallel according to the number of secondary windings 25 constituting one. In this embodiment, a total of eight secondary winding insertion holes 20 are provided in a 2 × 4 matrix at the center of the wiring base 4 connected to the support portion 3 so that four secondary windings 25 can be mounted. It has been. The wiring connection hole 21 is a round hole for avoiding the screw head when screwing external wiring such as a bus bar connected to the secondary side of the transformer 1, and in this embodiment, the secondary winding A total of four points are provided on the left and right sides of the wire insertion hole 20. The bracket mounting hole 22 is a square hole into which the locking piece 41 of the coupling bracket 40 is fitted when a coupling bracket 40 as a coupling tool to be described later is attached to the wiring base 4. It is scattered.

  In addition, a core 102 made of a magnetic member composed of a first core member 105 having an E-shaped section and a second core member 106 having an I-shaped section, and an annular projection 35 of the bobbin body 31 And an insulating sheet 39 in the form of an annular film having a center hole 38 of a size that can be fitted therein. As in the conventional example, the core 102 has a main leg 111 having a cylindrical shape in the center and a pair of side legs 112 on both sides of the main leg 111. By closing the flat second core member 106 on the mating surface 113 of the first core member 105 that forms the upper surface, a closed magnetic circuit is formed.

  Next, the connection fitting 40 and the winding assembly 45 will be described together with the assembly procedure of the transformer 1.

  First, as shown in FIG. 2, the primary winding 30 is assembled by connecting a plurality of bobbin bodies 31 (three in this embodiment) and winding the wire 115 around the bobbin body 31 through a winding process. To do. When connecting the bobbin body 31, an annular projection 35 of one bobbin body 31 is fitted to the fitting portion 37 by applying an addressing force from the flange 33 side to the through hole 36 of the other bobbin body 31. Link. At this time, align the direction of each bobbin body 31 so that the notches 34 of each bobbin body 31 are connected, and hook the wire 115 that has been wound around these notches 34, so that the wire 115 straddling between each bobbin body 31 can be Stabilize.

  A winding assembly 45 is completed by attaching the secondary winding 25 to the primary winding 30. FIG. 3 shows the winding assembly 45 removed from the base 2. The secondary winding 25 is mounted between the bobbin bodies 31 constituting the primary winding 30, and by inserting the annular projection 35 of each bobbin body 31 into the center hole 27 of the secondary winding 25, A winding part 26 is wound around each bobbin body 31. At this time, the leg portions 28 and 28 of the secondary winding 25 are located on the opposite side of the notch 34 of the bobbin body 31. The secondary winding 25 is also attached to the base 2. First, the leg portions 28, 28 of the secondary winding 25 are inserted into the secondary winding insertion holes 20, 20 provided in the wiring base 4, and the mounting portion 5 of the support portion 3 is the same as the winding assembly 45. The annular protrusion 7 provided in the second winding 25 is inserted into the center hole 27 of the secondary winding 25, and the winding portion 26 is placed on the placement portion 5. In this embodiment, three secondary windings 25 are mounted on the winding assembly 45 and one on the base 2.

For the substantial assembly procedure of the transformer 1, the winding assembly 45 is attached to the base 2 and the core 102 is attached. In order to attach the winding assembly 45 to the pedestal 2, the leg portions 28, 28 of the secondary windings 25 constituting the winding assembly 45 are connected to the secondary winding insertion holes 20, 20 provided in the wiring base 4. And inserting the annular projection 7 of the mounting portion 5 into the through-hole 36 of the bobbin body 31 which is the lowermost part of the winding assembly 45 from the flange 33 side and fitting it into the fitting portion 37 Let them connect. In this way, the winding assembly 45 is mounted and fixed on the mounting portion 5. Thereafter, the wire 115 extending from the winding assembly 45 is cut to an appropriate length, and the ends 115a and 115a are tangled to the connection terminals 10 and 10 and soldered and connected. Since the uppermost part of the winding assembly 45 is in a state where the conductive secondary winding 25 is exposed, insulation with the second core member 106 is ensured by attaching and covering the insulating sheet 39 to the winding part 26. As with the secondary winding 25, the insulating sheet 39 is attached by inserting the center hole 38 of the insulating sheet 39 into the annular protrusion 35 of the bobbin body 31. In the core 102, the main leg 111 of the first core member 105 is inserted into the through-hole 6 from below the mounting portion 5 with the mating surface 113 facing upward, and the main leg 111 penetrates the winding assembly 45. In this state, the mating surface 113 of the first core member 105 is aligned with the second core member 106, and the first core member 105 and the second core member 106 are fixed with, for example, an adhesive tape, etc., and the transformer 1 is almost completed. To do.

  FIGS. 4 and 5 show the connection bracket 40 attached thereto. The connection fitting 40 is attached by fitting a locking piece 41 into the fitting attachment hole 22 from the surface opposite to the winding assembly 45 of the wiring base 4. Hereinafter, the connecting metal fitting 40 will be described in detail with reference to FIGS. FIG. 6 shows how the connecting fitting 40 is attached when the output voltage of the transformer 1 is 5V. In FIG. 6, two substantially rectangular one-turn connecting fittings 40a are provided as the connecting fitting 40. The wiring base 4 is formed so as to be substantially divided into two, and the screw holes 42 and the two are formed at the same positions as the wiring connection hole 21 provided in the wiring base 4 and the secondary winding insertion hole 20 adjacent thereto. A next winding connection hole 43 is formed. The secondary winding connection hole 43 has substantially the same dimensions as the secondary winding insertion hole 20. On the other hand, the screw hole 42 has a smaller diameter than the wiring connection hole 21 so that a screw part 44 for screwing the bus bar can be inserted.

  The leg portion 28 of the secondary winding 25 protruding from the secondary winding insertion hole is inserted into the secondary winding connection hole 43 of the one-turn coupling fitting 40a and attached to the wiring base 4, for example by soldering. The one-turn coupling fitting 40a and the secondary winding 25 are electrically connected. The one turn connecting bracket 40a connects all the legs 28 of the secondary winding 25 to the external wiring, that is, all the secondary windings 25 constituting the transformer 1 are connected in parallel. The total number of turns of the secondary winding 25 is one turn.

  FIG. 7 shows how the coupling fitting 40 is attached when the output voltage of the transformer 1 is 12V. In this figure, the coupling fitting 40 is connected to an external wiring (not shown) connected to the wiring connection hole 21. ) And one of the leg portions 28 of the secondary winding 25, and an inter-winding connection fitting 40c for connecting the leg portions 28 of the two secondary windings 25 to each other. It is configured. Similarly to the one-turn coupling fitting 40a, the screw hole 42 and the secondary winding connection hole 43 are also provided at necessary positions. Two sets of external wiring connection fittings 40b are attached to the wiring base 4 side by side with one interwinding connection fitting 40c interposed therebetween, and the other set is attached so as to be vertically symmetrical. These connecting fittings 40 form two secondary windings 25 having a total number of turns of two, and two outputs can be taken out from the secondary side of the transformer 1.

  FIG. 8 shows how the connecting fitting 40 is attached when the output voltage of the transformer 1 is 24V. In FIG. 8, the connecting fitting 40 is connected between two external wiring connecting fittings 40b and three windings. It is comprised from the connection metal fitting 40c. Two external wiring connection fittings 40b are attached to the wiring base 4 on a diagonal line, and three inter-winding connection fittings 40c are attached in a line in the vertical direction between them. Since all the secondary windings 25 constituting the transformer 1 are connected in series by these connecting fittings 40, the total number of turns of the secondary winding 25 is four turns. By making the secondary winding 25 itself into a spiral structure, the number of turns can be further increased with the same configuration. Specifically, for example, a plate-shaped conductor wound in a spiral shape is used as a secondary winding 25, or a conductive pattern having a laminated spiral structure is formed using a solid pattern and a through hole on a printed circuit board. For example, the secondary winding 25 may be configured. For example, if the secondary winding 25 itself is wound for two turns, the output of the secondary winding 25 should be 48V even if the connecting bracket 40 is mounted in the same manner as the 24V specification. Can do.

  Thus, in the transformer 1, the number of turns of the entire secondary winding 25 formed by connecting the plurality of secondary windings 25 divided by one to several turns with the connecting metal fitting 40 determines the output voltage of the transformer 1. The number of turns on the secondary side. The number of turns of the secondary winding 25 as a whole requires a connection fitting 40 prepared in advance in various connection forms, such as a one-turn connection fitting 40a, an external wiring connection fitting 40b, and an interwinding connection fitting 40c. It is possible to change freely by simply changing according to. Therefore, for example, by adjusting the turn ratio of the primary winding 30 and the secondary winding 25 so that the desired output voltage specification such as 5V system, 12V system, 24V system, 48V system, etc. is achieved, the secondary winding 25 can be externally connected. Any output can be taken out via the wiring. Moreover, a plurality of outputs (for example, two outputs in FIG. 7) can be taken out depending on the connection form of the connecting bracket 40.

  By the way, in a transformer used for a large-capacity switching power supply or the like, a large current flows through a secondary circuit composed of electrical and electronic parts such as a rectifier / commutator diode and a smoothing circuit connected to the secondary winding, and a Joule Loss due to heat occurs. Currently, when mounting a transformer on a printed circuit board, the resistance component of the wiring pattern is reduced by connecting the secondary connection terminal of the transformer and each electrical / electronic component with multiple wiring patterns. Reduced and dealt with. In addition, if the loop formed by the wiring pattern of the electrical / electronic component or the printed circuit board on which the electrical / electronic component is mounted is large, noise is easily superimposed on the output. Therefore, in order to obtain a switching power supply with high efficiency and low noise, it is necessary to shorten the wiring pattern constituting the secondary circuit of the transformer as much as possible.

  The modification shown in FIG. 9 considers such a problem. In the figure, a connection fitting unit 56 is attached to the wiring base 4. The connection fitting unit 56 is arranged so as to bridge between the two external wiring connection fittings 40b, the three inter-winding connection fittings 40c, and the two external wiring connection fittings 40b and 40b arranged in the same manner as in FIG. The gap between the mounting connecting metal fitting 40d and the entire periphery thereof are solidified with an insulating resin 55 so as to be integrally formed in accordance with the shape of the wiring base 4.

  The mounting coupling bracket 40d is formed so as to be close to the two external wiring coupling brackets 40b and 40b, and through holes 51 and 51 are provided as mounting portions on which electrical and electronic components can be mounted in the adjacent portions. Yes. Correspondingly, each external wiring connecting bracket 40b is also provided with a through hole 50 as a mounting portion on which an electric / electronic component can be mounted. Of course, land for surface mounting may be provided in place of the through hole 50. The through-hole 50 of the external wiring connecting bracket 40b and the through-hole 51 of the mounting connecting bracket 40d are paired, and the lead of the diode 52 as the electric / electronic component is inserted into the pair, and soldered. Has been. Similarly to the external wiring connection fitting 40b, the mounting connection fitting 40d is also provided with a screwing hole 42 where external wiring such as a bus bar can be screwed.

  In this modification, the connection fitting unit 56 is used as a wiring pattern of a substrate by providing the through-holes 50 and 51 in the external wiring connection fitting 40b and the mounting connection fitting 40d, assuming the connection fitting unit 56 as a board. As a result, it is not necessary to provide a substrate for mounting the diode 52, and the wiring pattern of the secondary circuit can be shortened as much as possible. Therefore, the number of parts can be reduced, and the wiring pattern of the secondary circuit can be shortened as much as possible to reduce noise and heat loss.

  On the other hand, the primary winding 30 constituting the primary circuit of the transformer 1 is also connected to a switching element such as a MOSFET and an electric and electronic component such as a PWM control IC for controlling the switching element. As with the secondary side circuit, the primary side circuit has problems such as loss and noise, and a reduction in the number of components is desired from the viewpoint of cost and miniaturization. Since the end portions 115a and 115a of the primary winding 30 are soldered and connected to the connection terminals 10 and 10 provided in the mounting portion 5, a wiring pattern electrically connected to the connection terminals 10 and 10, for example, through If a mounting part (not shown) such as a hole or a land is formed on the mounting part 5 so that a bare chip or a surface mounting IC constituting the primary circuit can be directly mounted on the mounting part 5, these components There is no need to provide a substrate for mounting the circuit, and the wiring pattern of the primary circuit can be made as short as possible. Thereby, regarding the primary side circuit, the number of parts can be reduced, and the wiring pattern can be shortened as much as possible to reduce noise, heat loss, and the like.

As described above, in this embodiment, the pedestal 2 having insulating properties, the primary winding 30 and the secondary winding 25 as a plurality of winding bodies formed by winding a conductor, and the primary windings 30 and 2 A core 102 as a core member for magnetically coupling the secondary winding 25, and leg portions 28 and 28 (or a wire 115) corresponding to the start and end portions of the secondary winding 25 attached to the base 2; Connecting metal 40 (one turn connecting metal fitting 40a, external wiring connecting metal fitting 40b, winding) as a detachable connecting tool to the wiring base 4 of the pedestal 2 for electrically connecting one selected from the external wiring. The transformer 1 is composed of the line connecting fittings 40c), and the connecting fitting 40 has all the starting ends of the plurality of secondary windings 25 and external wiring, and all the terminal ends of the plurality of secondary windings 25 and external wiring. A one-turn coupling fitting 40a as a first coupling tool, each of which is connected to each other and the number of turns of the entire secondary winding 25 is one turn; The outer end of the secondary winding 25 on one side and the external wiring, the outer end of the secondary winding 25 on the other outer side and the external wiring, and the secondary winding 25 on the outermost side and the outermost side Between the secondary windings 25, the terminal part of one adjacent secondary winding 25 and the start part of the other secondary winding 25 are connected to each other, and the total number of turns of the secondary winding 25 is 2 turns or more. One of the external wiring coupling fitting 40b and the interwinding coupling fitting 40c as the second coupling tool is attached.

  By doing this, by replacing the connection fittings 40 prepared in advance so as to have various connection forms such as the one-turn connection fittings 40a, the external wiring connection fittings 40b, and the interwinding connection fittings 40c, Since the number of turns of the entire secondary winding composed of a plurality of secondary windings 25 can be freely changed, the turns ratio of the primary winding 30 and the secondary winding 25 to achieve a desired output voltage specification By adjusting, it is possible to take out an arbitrary output from the secondary winding 25 via an external wiring. Accordingly, it is possible to provide a transformer structure in which the turn ratio can be freely changed according to the user's required specifications afterwards.

  Further, in the transformer 1 of the present embodiment, through holes 50 and 51 as mounting portions on which a diode 52 as an electric / electronic component can be mounted are provided in the connection fitting 40 (external wiring connection fitting 40b, mounting connection fitting 40d). .

  In this case, by using the connecting metal fitting 40 as the circuit wiring, the circuit wiring can be shortened as much as possible, and a circuit can be formed without using a substrate for mounting the diode 52. Therefore, it becomes possible to mount electrical and electronic parts such as the diode 52 on the connecting bracket 40, so that the number of parts can be reduced and the wiring pattern can be shortened as much as possible to reduce noise and heat loss. .

  Furthermore, in the transformer 1 of the present embodiment, the connection terminals 10 and 10 as connection portions to which the end portions 115a and 115a corresponding to the start end portion or the end end portion of the primary winding 30 are connected, and the connection terminals 10 and 10 are energized. For example, a through hole or a land as a mounting portion on which a component can be mounted is provided on the mounting portion 5 of the base 2.

  In this way, the circuit wiring can be shortened as much as possible by using the pedestal 2 constituting the transformer 1 as a substrate for mounting electrical and electronic components, and a circuit can be formed without using a substrate. it can. Therefore, by making it possible to mount electrical and electronic components on the pedestal 2, the number of components can be reduced, and the wiring pattern can be shortened as much as possible to reduce noise and heat loss.

  FIG. 10 is an exploded perspective view of the transformer structure in the second embodiment, but the wire 115 constituting the primary winding 30 is omitted. The transformer 1 mainly includes a primary winding 30 as a primary winding body, a secondary winding 25 as a secondary winding body, and a bobbin 62 around which the primary winding 30 and the secondary winding 25 are wound. And a connecting fitting 40 attached to the bobbin 62 and a core 102 as a core member made of a magnetic member. The connection bracket 40 will be described later.

  The primary winding 30 is formed by winding a wire 115 around a cylindrical bobbin body 31 made of, for example, resin having a through hole 36. The bobbin body 31 is formed with annular plate-like flanges 32 and 33 at both ends so that the wire 115 does not slip out and fall off. The flanges 32 and 33 are not completely circular, but are partially rectangular, and a pair of notches 34 and 34 are formed so as to be symmetrical with each other at both ends in the longitudinal direction of the rectangular portion. Further, on the peripheral wall of the through hole 36 on the rectangular portion side (inside the bobbin body 31), a protruding strip portion 61 that is continuous along the axial direction is formed.

  The secondary winding 25 is made of, for example, a plate-like member such as aluminum, and a non-continuous annular winding portion 26 lacking a part, and a pair of legs serving as a start end portion or a termination portion of the secondary winding 25 It consists of parts 28 and 28. The leg portions 28 and 28 extend in one radial direction from both ends of the winding portion 26 so as to be parallel and linear to each other. The central hole 27 of the winding part 26 is sized so that a cylindrical part 65 of a bobbin 62, which will be described later, can be inserted, on the side opposite to the leg parts 28, 28 of the circumferential part of the central hole 27. Is formed with a protrusion 60 protruding in the center direction.

  Similarly to the first embodiment, the secondary winding 25 of the present embodiment can be a spirally wound plate-like conductor. Specifically, the notched portion of the winding portion 26 is deviated to form a leg portion 28a and a short connecting leg portion 28b instead of the leg portions 28, 28, and the connecting legs in the two secondary windings 25 facing each other. What is necessary is just to form so that the parts 28b may be connected. At this time, one leg portion 28a and the other leg portion 28a are staggered, and the leg portion 28a is located at the center thereof. The spiral secondary winding 25 a formed in this way can be wound around the bobbin 62 instead of the two secondary windings 25. In that case, the primary winding 30 is wound around the bobbin 62 in a state where the primary winding 30 is sandwiched between the two winding portions 26 constituting the spiral secondary winding 25a. Of course, two winding portions 26 may be brought into close contact with each other by using an insulating sheet or the like to replace one of the secondary windings 25. In this case, by using the spiral secondary winding 25a, substantially the same operations and effects as the secondary winding 25 having two turns are obtained.

  The bobbin 62 is configured by combining a divided bobbin 62a and a divided bobbin 62b which are divided into two. The divided bobbins 62a and 62b have substantially the same shape, and may have the same shape if there are no restrictions on mounting, for example. In other words, the divided bobbins 62a and 62b can have a common structure, and the manufacturing cost can be kept low. The divided bobbins 62a and 62b have a flange portion 63 that is congruent with the flanges 32 and 33, and a U-shape that is mounted on a substrate (not shown) by soldering or the like and supports the flange portion 63 and the transformer 1 as a whole. And a pedestal 68.

  A cylindrical portion 65 as a winding portion that surrounds the periphery of the through hole 64 like a wall is formed in the center portion of the flange portion 63 inwardly. The cylindrical portion 65 is formed with a guide groove 66 for fitting the protruding strip portion 61 and the protruding portion 60. Further, on the upper portion of the flange portion 63, a winding receiver 67 is projected from the outer surface thereof in a groove shape for receiving the wire body 115 and guiding it to the front side in the radial direction of the flange portion 63. A core stopper 69 is provided below the winding receiver 67, and a core stopper 69 is also provided above the pedestal 68 at a position facing the core stopper 69 through the through-hole 64. The core stoppers 69, 69 formed in the above are provided so that their apexes face each other vertically. These core stoppers 69, 69 are formed in accordance with the shape of the first core member 105, and in this embodiment, the core stopper 69 is provided at the constricted portion of the main body member constituting the first core member 105. 69 are fitted.

  A flange portion 63 is erected on the inner side of the center of the pedestal 68, and arm portions 80, 80 project inward from both sides of the pedestal 68 so as to surround the flange portion 63. On the distal end surfaces of the arm portions 80, 80, one arm portion 80 is provided with a fitting protrusion 81, and the other arm portion 80 is provided with a fitting hole 82. On the bottom surface of the pedestal 68, a plurality of mounting terminals 70, 70 that can be soldered to a board on which external wiring is disposed, and a plurality of positioning protrusions 85 that are inserted into the positioning holes 73 of the connecting bracket 40 are projected. Yes. In the divided bobbin 62a, a protruding portion 80a that protrudes outward from the end portion of the pedestal 68 on the near side and the base side surface of the arm portion 80 is formed. Winding locking grooves 76 and 76 are formed on the front end surface of the projecting portion 80a, and primary terminals 75 and 75 project from the bottom surface in the vicinity thereof corresponding to these. On the other hand, the divided bobbin 62b is formed with a protruding portion 80b in which the base side surface of the arm portion 80 on the front side protrudes, and tap terminals 71 and 71 as auxiliary terminals protrude from the bottom surface. In addition, a winding guide groove 86 is provided on the bottom surface of the projecting portion 80b so as to pass between the tap terminals 71 and 71 and cross the bottom surface of the arm portion 80 of the divided bobbin 62b in a straight line in the short direction. When the divided bobbin 62a and the divided bobbin 62b have the same shape, primary terminals 75, 75 are provided on one arm 80 side, and tap terminals 71, 71 are provided on the other arm 80 side. It will be.

  In addition, in this embodiment, the core 102 is configured by combining two first core members 105, 105 having the same shape. That is, a closed magnetic circuit is formed by abutting the abutting surfaces 113 of the pair of first core members 105, 105 having an E-shaped cross section.

  Next, the connection fitting 40 will be described together with the assembly procedure of the transformer 1.

First, for assembling the primary winding 30, the wire 115 is wound around the bobbin body 31 through a winding process. At this time, align the direction of each bobbin body 31 so that the notches 34 of each bobbin body 31 are connected, and hook the wire 115 that has been wound around these notches 34, so that the wire 115 straddling between each bobbin body 31 can be Stabilize. Further, the secondary winding 25 is sandwiched between the bobbin bodies 31, and the cylindrical portions 65, 65 of the divided bobbins 62a, 62b are inserted into the through holes 36 and the center hole 27 so as to be sandwiched from both sides, and the divided bobbins 62a, The arm portions 80 of 62b are brought together. At this time, the protrusions 61 of the bobbin bodies 31 and the protrusions 60 of the secondary windings 25 are fitted into the guide grooves 66 formed in the cylindrical portion 65, thereby preventing these rotations. Then, the fitting protrusion 81 and the fitting hole 82 provided on the distal end surface of the arm portion 80 are fitted together to assemble the bobbin 62 in which the divided bobbin 62a and the divided bobbin 62b are combined. The wire 115 extending from the bobbin body 31 is transmitted through the winding receiver 67 of the divided bobbin 62a, and is suspended from there to the winding locking grooves 76 and 76 formed at the tip of the protruding portion 80a. After that, the wire 115 is cut at an appropriate length, and is connected to the connection terminal primary side terminals 75 and 75 by soldering. Since the wire rod 115 which is a part of the primary winding 30 is routed away from the main body by the winding receiver 67 and the protruding portion 80a, these correspond to the routing means . It shows the state of this is shown in FIG 11. In the assembled state, the leg portions 28 and 28 of the secondary winding 25 are surrounded by the pedestal 68.

  The core 102 inserts the main legs 111, 111 of the first core members 105, 105 into the through holes 64 of the bobbin 62 from both sides, and brings together the mating surfaces 113, 113 of the first core members 105, 105, The first core members 105 and 105 are fixed with, for example, an adhesive tape, and the transformer 1 is almost completed.

  In addition, an auxiliary tap for synchronous rectification, for example, an external component such as an EMI countermeasure component, a current transformer, or the like can be provided as an option. As for the auxiliary tap for synchronous rectification, a wire rod different from the wire rod 115 constituting the primary winding 30 is wound around the bobbin body 31 near the tap terminal 71, and both ends thereof are provided on the bottom surface of the arm portion 80 of the divided bobbin 62b. What is necessary is just to solder to the tap terminals 71 and 71 through the winding guide groove 86, respectively. Examples of the EMI countermeasure parts include a bead core and a clamp core. However, since the wire 115 is stretched between the winding receiver 67 of the divided bobbin 62a and the winding locking grooves 76, 76, the wire 115 A space for attaching these EMI countermeasure parts to the routed portion is secured and can be easily attached. In addition, a current transformer can be provided by using the drawn portion of the wire 115. In this case, the projecting portion 80a of the divided bobbin 62a may be provided with a current transformer configuration such as a bobbin or a terminal.

  FIG. 12 shows the final attachment of the connecting metal fitting 40. FIG. The connecting fitting 40 is attached to the legs 28 and 28 of the secondary winding 25 from the bottom side of the bobbin 62 by soldering. Hereinafter, the connection fitting 40 will be described in detail with reference to FIGS.

  FIG. 13 shows how the connecting fitting 40 is mounted when the output voltage of the transformer 1 is 5V. In FIG. 13, two substantially rectangular one-turn connecting fittings 40a are provided as the connecting fitting 40. The bottom surface of the bobbin 62 is formed so as to be substantially bisected, and the secondary winding connection hole 43, which is a long hole into which one side of the leg portion 28 of the secondary winding 25 arranged in a row can be inserted, and the bottom surface of the bobbin 62 A provided positioning hole 73 is formed. The secondary winding connection holes 43 are arranged in parallel according to the number of secondary windings 25. In addition, the connection fitting 40a of the present embodiment is provided with mounting terminal portions 72, 72 extending from the end in the longitudinal direction to the outside of the bobbin 62 and then hanging down. The mounting terminal portions 72, 72 are directly connected to the substrate (external wiring). ) Is mounted by soldering. With the coupling bracket 40 attached to the bobbin 62, the end of the mounting terminal portion 72 is exposed to the outside of the bobbin 62, so that the mounting part is not hidden under the bobbin 62 even when mounted on the board. Therefore, the soldering state with the substrate can be easily confirmed from above.

  The leg portion 28 of the secondary winding 25 is inserted into the secondary winding connection hole 43 of the one-turn connection fitting 40a, and the positioning protrusion 85 is inserted into the positioning hole 73 so that the one-turn connection fitting 40a is connected to the bobbin. The one-turn coupling fitting 40a and the secondary winding 25 are electrically connected to each other by, for example, soldering. In this case, the number of turns of the secondary winding 25 is 1 turn as a whole. However, as described above, if the spiral secondary winding 25a is used instead of the secondary winding 25, the number of turns is 12V. It is also possible to make it a specification.

  FIG. 14 shows how the connecting fitting 40 is attached when the output voltage of the transformer 1 is 12 V. In FIG. 14, the connecting fitting 40 has two mounting terminals 72 arranged in the same row. A straddle connection fitting 40e for connecting one leg portion 28 of the secondary winding 25 in a single step, and an inter-winding connection fitting 40c for connecting the leg portions 28 of the two secondary windings 25 located in different rows to each other. It consists of and. Similarly to the one-turn coupling fitting 40a, the positioning hole 73 and the secondary winding connection hole 43 are also provided at necessary positions. Two straddling connecting fittings 40e are attached to the bobbin 62 diagonally, and a total of two interwinding connecting fittings 40c are attached to the legs 28 that remain in the state where the adjacent secondary windings 25 are overlaid. . These secondary fittings 40 form two secondary windings 25 having a total number of turns of 2 and are connected in parallel.

  FIG. 15 shows how the connecting fitting 40 is mounted when the output voltage of the transformer 1 is 24 V. In FIG. 15, the connecting fitting 40 has a mounting terminal portion 72 and is diagonal. It is composed of two external wiring connection fittings 40b connected to the leg portion 28 of the secondary winding 25 and three inter-winding connection fittings 40c. Two external wiring connection fittings 40b are attached to the bobbin 62 on a diagonal line, and three inter-winding connection fittings 40c are arranged in a line in a row therebetween. Since all the secondary windings 25 constituting the transformer 1 are connected in series by these connecting fittings 40, the total number of turns of the secondary winding 25 is four turns. Similar to the first embodiment, for example, if the secondary winding 25 itself is wound for two turns, even if the connecting metal fitting 40 has the same mounting manner as the previous 24V specification, the secondary winding 25 outputs can be 48V specification.

As described above, in this embodiment, the bobbin 62 having the pedestal 68 and the cylindrical portion 65 as the winding portion formed by combining the divided bobbins 62a and 62b, and a primary winding as a plurality of winding bodies formed by winding a conductor. Winding 30, secondary winding 25, core 102 as a core member for magnetically coupling these primary winding 30, secondary winding 25, and primary winding 30, wound around cylindrical portion 65, As a detachable coupling tool for electrically connecting a leg 28, 28 (or wire 115) corresponding to the start and end of the secondary winding 25 and an external wiring, which are arbitrarily selected. The transformer 1 is composed of the connecting bracket 40 (one-turn connecting bracket 40a, external wiring connecting bracket 40b, interwinding connecting bracket 40c, straddling connecting bracket 40e), and the connecting bracket 40 includes a plurality of secondary windings 25. The entire number of turns of the secondary winding 25 is connected by connecting all the start ends and external wiring, and all the terminations of the secondary windings 25 and external wiring. 1-turn coupling fitting 40a as a first coupling with one turn, the start and end of the secondary winding 25 on the outermost one, the external wiring, and the end of the secondary winding 25 on the outermost other Between the secondary winding 25 on the outermost side and the secondary winding 25 on the outermost side and the secondary winding 25 on the other outermost side, and the terminal portion of one adjacent secondary winding 25 and the other secondary winding 25 Are connected to each other, and any one of the external wiring coupling metal fitting 40b, the interwinding coupling metal fitting 40c, and the straddling coupling metal fitting 40e as a second coupling tool in which the total number of turns of the secondary winding 25 is two turns or more. Installed.

  In this way, the number of turns of the entire secondary winding composed of a plurality of secondary windings 25 can be freely changed by simply replacing the coupling tool 40 prepared in advance in various connection forms as necessary. Therefore, an arbitrary output can be taken out from the secondary winding 25 by adjusting the turn ratio of the primary winding 30 and the secondary winding 25 so as to achieve a desired output voltage specification.

  Further, in the transformer 1 of this embodiment, a tap terminal 71 is provided on the base 68 as an auxiliary terminal for connecting the starting end and the terminal end of the wire wound around the primary winding 30.

  In this way, a plurality of outputs can be extracted from the wire wound around the primary winding 30.

  Further, in the transformer 1 of this embodiment, a winding receiver 67 and a projecting portion 80a are provided as routing means for routing the wire 115 which is a part of the primary winding 30 away from the main body.

  If it does in this way, external parts, such as EMI countermeasure parts, can be easily attached to the wire 115 concerned, for example.

  Further, in the transformer 1 of this embodiment, another transformer is constituted by the wire material 115 constituting the primary winding 30 drawn away from the main body.

  In this way, another transformer such as a current transformer can be added to the transformer 1 by using the wire 115.

  FIG. 16 shows a transformer structure in the third embodiment. In this embodiment, the bobbin 62 is one piece that is not divided. The bobbin 62 includes a rectangular pedestal 68 having a mounting terminal 70, a tap terminal 71, and a primary side terminal 75 projecting from the bottom surface, and a cylindrical portion 65 extending upward from the pedestal 68. The primary winding 30 has the same structure as that of the second embodiment, and the secondary winding 25 has substantially the same configuration as that of the spiral secondary winding 25a described in the second embodiment. That is, in the third embodiment, the positional relationship between the primary winding 30 and the secondary winding 25 and the pedestal 68 in the second embodiment is changed, and the primary winding 30 and the secondary winding 25 are changed to the first embodiment. As an example, it is configured such that it is vertically stacked on the pedestal 68. An insulating sheet 39 is interposed between the winding portions 26 of the adjacent spiral secondary windings 25a in order to insulate them from each other.

  Accordingly, the leg portion 28a of the spiral secondary winding 25a is extended in an inverted L shape so as to hang down to the pedestal 68. The leg portions 28a, 28a constituting the spiral secondary winding 25a are bent so as to hang down after extending in opposite directions along the tangential direction of the winding portion 26. At this time, the bending distance of the leg portion 28a (distance from the base portion to the suspended portion in the leg portion 28a) is gradually decreased toward the lower side so that the leg portions 28a do not contact each other. The core 102 is also attached to the bobbin 62 so that the first core members 105 and 105 are sandwiched from above and below.

  Then, by attaching a connection fitting 40 (not shown) to the tip of the leg portion 28a, an arbitrary output can be taken out from the spiral secondary winding 25a as in the first and second embodiments.

  The present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention. Not only the secondary winding 25 but also the primary winding 30 is divided and the end portions 115a and 115a of the primary winding 30 are connected by the connecting fitting 40 in the same manner as the legs 28 and 28 of the secondary winding 25. The number of turns may be changed by freely connecting.

It is a disassembled perspective view which shows the transformer structure in 1st Example of this invention. It is a perspective view which shows a primary winding of a transformer structure same as the above. It is a perspective view which shows the state which removed the coil | winding assembly from the base of a transformer structure same as the above. It is a perspective view which shows the completion state of a transformer structure same as the above. It is the perspective view which looked at the completion state of the transformer structure from another angle same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 1 turn same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 2 turns 2 outputs same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 4 turns same as the above. It is a front view which shows the modification of a transformer structure same as the above. It is a disassembled perspective view which shows the transformer structure in 2nd Example of this invention. It is a perspective view which shows the state which assembled the bobbin of the transformer structure same as the above. It is a perspective view which shows the completion state of a transformer structure same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 1 turn same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 2 turns same as the above. It is a front view which shows the state which comprised the secondary winding of the transformer structure to 4 turns same as the above. It is a perspective view which shows the completion state of the transformer structure in 3rd Example of this invention. It is a disassembled perspective view which shows the transformer structure in a prior art example.

2 Pedestal 4 Wiring base (pedestal)
5 Placement (pedestal)
10 Connection terminal (connection part)
25 Secondary winding (winding body)
28 legs (start and end)
30 Primary winding (winding body)
40 Connecting bracket (connector)
40a 1-turn connection bracket (connector , first connector )
40b External wiring connector (connector , second connector )
40c Coil between windings (connector , second connector )
40d Mounting connection bracket (connector)
40e Cross connection fitting (connector , second connector )
50, 51 Through hole (mounting part)
52 Diode (component)
62 bobbins
62a, 62b Split bobbin
65 Tube (winding part)
67 Winding receiver (routing means)
68 pedestal
71 Tap terminal (auxiliary terminal)
80a Protruding part (drawing means)
102 Core (core member)
115a End (starting end, terminal end)

Claims (7)

An insulating pedestal;
Ri Na by winding the conductor, and a plurality of windings body having a first winding body and the second winding body outermost,
A core member for magnetically coupling these winding bodies;
It is composed of a detachable coupling that electrically connects one selected arbitrarily from the start and end of the winding body attached to the pedestal and external wiring ,
The coupling unit connects all of the start ends of the plurality of winding bodies to the external wiring, and all of the end portions of the plurality of winding bodies to the external wiring, so that the number of turns of the whole winding body is one turn. A first coupling tool,
Between the starting end of the first winding body and the external wiring, the terminal end of the second winding body and the external wiring, and between the first winding body and the second winding body, Connect one end of one of the adjacent winding bodies and the start end of the other winding body, and attach any one of the second coupling tools that has two or more turns of the entire winding body. trans structure characterized by comprising. A bobbin comprising a split bobbin and having a pedestal and a winding part;
Ri Na by winding the conductor, and a plurality of windings body having a first winding body and the second winding body outermost,
A core member for magnetically coupling these winding bodies;
It is composed of a detachable coupler that electrically connects one selected arbitrarily from the start and end portions of the winding body wound around the winding portion and external wiring ,
The coupling unit connects all of the start ends of the plurality of winding bodies to the external wiring, and all of the end portions of the plurality of winding bodies to the external wiring, so that the number of turns of the whole winding body is one turn. A first coupling tool,
Between the starting end of the first winding body and the external wiring, the terminal end of the second winding body and the external wiring, and between the first winding body and the second winding body, Connect one end of one of the adjacent winding bodies and the start end of the other winding body, and attach any one of the second coupling tools that has two or more turns of the entire winding body. trans structure characterized by comprising.   The transformer structure according to claim 1, wherein a mounting portion capable of mounting a component is provided in the connector.   The connection part to which the said start part or the said terminal part is connected, and the mounting part which can energize this connection part and can mount components are provided in the said base. The transformer structure described in 1.   The transformer structure according to any one of claims 1 to 4, wherein an auxiliary terminal for connecting a starting end and a terminal end of the winding body is provided on the base.   6. The transformer structure according to claim 1, further comprising routing means for routing a part of the winding body away from the main body.   7. The transformer structure according to claim 6, wherein another transformer is constituted by a winding body that is drawn away from the main body.

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