JPH0563025U - Transformer structure - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Ensure electrical insulation and mechanical protection of the winding part,
Ensure electrical insulation between the bobbin winding or magnetic core and the input / output terminals. A winding frame main body in which a magnetic core insertion hole is formed and a winding is wound outside, a mounting frame for narrowing the winding frame main body at both ends, an intermediate mounting frame, and In a transformer structure in which a coil bobbin supporting both ends and an intermediate fitting frame and having a base provided with input / output terminals 41 and 42 respectively is wound and magnetic cores 71 and 75 are combined, A side wall portion provided so as to surround the covering flat surface portion, an embossed cover portion having a magnetic core fitting hole in the side wall portion, a magnetic core mounting portion 61 of the embossed cover portion, and the mounting member. Input / output terminals 41, 42 projecting from a base supporting the frame
A shield portion 6 extended to the side surface of the magnetic core mounting portion so as to cover the
6 and 68, and a transformer cover is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a thin transformer (choke coil and choke coil) in which a coil bobbin having an intermediate fitting frame with windings is fitted with a cover configured to cover the coil bobbin, and a magnetic core made of a magnetic material is fitted therein. (Including noise filters, etc.) structure.

[0002]

[Prior Art]

 Generally, in a transformer or the like, a winding is divided into a primary side and a secondary side, and a magnetic path is formed by a magnetic core in the winding part, so that the primary side and the secondary side are By transmitting electromagnetic energy corresponding to the turns ratio, the voltage is boosted, or the circuit functions such as increase / decrease of current are expressed.

An example of a conventional general transformer structure will be described in detail with reference to FIGS. 4 to 8.

In FIG. 5, a thin coil bobbin 1 used in a conventional thin transformer is formed by molding a synthetic resin or the like with a die or the like. That is, a winding portion 4 around which a winding such as an enamel wire is wound is provided on the outer peripheral portion of the winding frame main body 2 having a quadrangular prism shape, and has an E-shaped inside, for example. The insertion hole 3 into which the central magnetic leg of the magnetic core is inserted is formed so as to penetrate therethrough.

A first fitting frame 5 and a second fitting frame 6 are provided at the front end and the rear end of the winding frame main body 2 so as to sandwich the winding frame main body 2, respectively. The bobbin body 2, the first fitting frame 5 and the second fitting frame 6 form a substantially bobbin shape.

At this time, the fitting insertion hole 3 is also formed in the first fitting frame 5 and the second fitting frame 6 by, for example, integrally molding the coil bobbin 1.

Further, the first fitting frame 5 and the second fitting frame 6 are provided with a first base 7 on the front side and a second base 8 on the rear side, respectively. An input / output terminal 11 is provided on a side surface 9 of the one base 7 in the direction of the fitting insertion hole so as to project at a position parallel to the fitting insertion hole 3 at a right angle to the side surface.

Further, the input / output terminal 11 is formed so that the tip end portion is bent in an S-shape from the twisting portion to the position of the bottom surface of the coil bobbin so as to come into contact with the substrate during mounting.

Input / output terminals 13 are similarly provided on the rear side surface 10 of the second base 8 in a protruding manner, and the tip portion is bent and formed from the twisting portion.

Next, referring to FIG. 6, in the conventional thin transformer 20, after winding the winding wire 26 around the coil bobbin 1 and twisting the winding wire 26 to the input / output terminal 11, the central magnetic leg 22 of the E-shaped magnetic core 21 is fitted. It is fitted in the mounting hole 3 to form a magnetic path together with the side magnetic legs 23 and 24 and the I-shaped magnetic core 25.

In the above conventional transformer structure, generally, the wound winding portion or the like is not provided with any electrical insulation and mechanical protection from the external environment and the like. In particular, on the side of inputting / outputting a high voltage or a large current, there is a possibility that the transformer function may be physically damaged or an electrical short circuit with another electronic component may occur.

Further, the transformer 20 generally has only a winding portion of the coil bobbin exposed to the external environment, or simply an insulating tape or the like adhered thereto. Even if an attempt is made to suck the winding part by the suction part of the automatic component mounting device, the action is difficult and the winding part may be damaged. Was not suitable for automatic implementation of.

[0013] Furthermore, in response to a demand for miniaturization and thinning of electronic equipment having the transformer 20 built therein, a magnetic core that mediates magnetic energy is connected to a winding end portion derived from a winding portion of a coil bobbin. The input and output terminals are close to each other, and especially on the side that inputs and outputs high voltage or large current, the magnetic core and the input and output terminals or the magnetic core and the winding section There is a risk that an electrical short circuit may occur, and once the electrical short circuit occurs, there is an inherent risk that the transformer or the like may be destroyed or the safety in use may be threatened.

Therefore, in the conventional transformer, particularly in the transformer that generates a high voltage, in view of the above-described usage pattern, in order to improve the characteristics and ensure safety in use, electrical insulation of the winding portion as shown in FIG. 7 is ensured. A transformer having a structure as shown in FIG. 8 in which a magnetic core is fitted after a cover 29 made of synthetic resin covering the side surface and the upper surface of the coil bobbin on which the winding is wound is mounted. 30 have been devised.

In addition to improving the structural characteristics, reliability, safety, etc. of the transformer, in order to further reduce the height of the thin transformer in combination with the demand for smaller and thinner coil parts. As shown in FIG. 4, a winding frame main body 34 in which a fitting insertion hole 33 into which a magnetic core is inserted and a winding is wound outside is formed, and both ends of the winding frame main body 34. The mounting frames 35 and 36, which are narrowed by the intermediate frame, the intermediate mounting frame 32 disposed at the outer intermediate portion of the winding frame main body, the both ends and the intermediate mounting frames 38, 39, and 37. And a coil bobbin 31 having bases 38, 39 and 37 provided with input / output terminals 41, 43 and 42, respectively, is wound, and a magnetic core made of a magnetic material is combined. A transformer structure has been devised.

In the coil bobbin 31, it is not necessary to wind the primary winding and then fold it back to connect it to the input / output terminals 41 and 43 on both sides of the winding frame, and to connect it to the intermediate fitting frame base. Since it can be connected to the protruding input / output terminal 42, it is possible to prevent the winding portion from becoming taller due to being folded back, which contributes to further height reduction of the thin transformer.

[0017]

However, in the thin transformer using the type having the intermediate fitting frame 32 such as the coil bobbin 31 of FIG. 4, in the side surface of the intermediate fitting frame base 37, the input / output terminals are provided. Since 42 is a structure projecting from the side magnetic leg at a close distance, it requires electrical insulation and mechanical protection more than the conventional thin transformer 20, but a structure like a transformer 30 still equipped with a cover 29. There was nothing.

In the transformer 30 with the cover 29 shown in FIG. 8, the insulating property is improved because the distance between the input / output terminal 11 and the magnetic core 25 is separated by the thickness of the cover mounted on the base. It cannot be said that the perfect insulation has been secured yet.

The present invention has been made in view of the above circumstances, in which a coil bobbin having an intermediate fitting frame with a winding is attached with an insulating cover configured to cover the coil bobbin. , As a transformer structure (including choke coil and noise filter) in which a magnetic core made of a magnetic material is fitted, electrical insulation of the input / output terminals of the coil bobbin or the gap between the magnetic core and the winding of the transformer By ensuring the above, it is possible to provide a thin transformer configured so as to improve the characteristics such as the transformer and achieve safety in use.

[0020]

[Means for Solving the Problems]

 The present invention provides a winding frame main body having an insertion hole into which a magnetic core is inserted and an external winding being wound, and a fitting frame for narrowing the winding frame main body at both ends. The coil bobbin is wound around a coil bobbin having an intermediate fitting frame arranged at an outer middle part of the winding frame main body, and a base supporting the both ends and the intermediate fitting frame and having input / output terminals respectively provided therein. In a transformer structure configured by combining magnetic cores made of a magnetic material, a covering flat surface portion, a side wall portion surrounding the covering flat surface portion, and a magnetic core fitting on the side wall portion. In order to cover the embossed cover portion having the insertion hole, the magnetic core mounting portion provided around the edge portion of the embossed cover portion, and the input / output terminals projectingly provided on the base supporting the fitting frame. A transformer cover having a shield portion extending from a side surface of the magnetic core mounting portion is attached. By providing a transformer structure characterized is for achieving the above object.

[0021]

[Action]

 In the present invention, a transformer cover includes a cover plane portion, a side wall portion provided so as to surround the cover plane portion, an embossed cover portion having a magnetic core insertion hole in the side wall portion, and the embossed shape. Since the magnetic core mounting part is provided around the edge of the cover part, the embossed cover part or the magnetic core mounting part allows the winding part of the transformer or the like to be connected to another electronic device or the like. Electrical and mechanical protection from the external environment.

In the transformer cover, since the shielding portion is arranged at the edge of the magnetic core mounting portion, the magnetic core and the input / output terminal portion of the coil bobbin and the magnetic core and the winding portion of the transformer are provided. Electrical insulation can be secured by the shield.

Further, after the board is mounted, the shielding portion prevents the human body from being in contact with the input / output terminal, so that the safety is improved.

[0024]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings.

The coil bobbin used in this embodiment is the same as the coil bobbin 31 of FIG. 4, and as described above, the insertion hole 33 into which the magnetic core is inserted is formed and the winding is wound on the outside. A winding frame main body 34 having a wound winding portion 46, fitting frames 35 and 36 for narrowing the winding frame main body 34 at both ends, and an outer intermediate portion of the winding frame main body 34. An intermediate mounting frame 32, bases 38, 39, 37 for supporting the mounting frames 35, 36 at both ends and the intermediate mounting frame 32 and having input / output terminals 41, 43, 42 respectively. I / O terminals 41 and 43 provided on the fitting frame bases 38 and 39 at both ends are projected in parallel with the magnetic core fitting direction, and further provided on the intermediate fitting frame base 37. The input / output terminals 42 at right angles to the magnetic core fitting direction and It has a structure that protrudes in the running direction.

The coil bobbin 31 is made of phenolic resin or the like, and is integrally formed by molding the synthetic resin with a die or the like. The bottoms of the bases 38 and 39 are provided with a reel main body and leads. A cut groove (for example, 47 in FIG. 4) for leading the winding between the terminals is provided between the input and output terminals.

In the coil bobbin 31, the primary winding can be connected to the input / output terminals 42 protruding from the intermediate fitting frame base 37 without returning to the fitting frames at both ends of the winding frame. At this time, even when the secondary winding is wound over both ends of the winding frame, the thickness of the frame portion of the intermediate mounting frame is made equal to that of the winding, so that the influence of the intermediate mounting frame on the thickness of the transformer is not affected. Absent. The input / output terminal 42 can also be used as an intermediate tap for the secondary winding.

FIG. 2 shows a state in which the coil 48 is wound around the coil bobbin 31 and the input / output terminals are covered as described above.

The starting winding portion, the final winding portion, the intermediate lead-out portion, and the like of the primary winding and the secondary winding are twisted to the input / output terminals 41, 43, 42 via the respective base portions. It is fixed by soldering if necessary.

Next, the transformer cover used in this embodiment has a structure as shown in FIG. That is, an embossed cover portion 59 extruded upward in an embossed manner so as to cover the winding portion is formed at a substantially central portion of the flange-shaped magnetic core mounting base material 65 by using a synthetic resin material as a material. ing.

The embossed cover portion 59 has a substantially quadrangular shape, and a flat cover plane portion 53 is formed on an upper portion thereof. The front side wall is forwardly supported so as to support the cover plane portion 53 in a ceiling shape. A part 55, a rear side wall part 56 on the rear side, a left side wall part 57 on the left side, and a right side wall part 58 on the right side are erected.

Further, the embossed cover portion 59 has a magnetic leg shape so that a central magnetic leg of a magnetic core, which will be described later, is fitted and inserted into substantially the centers of the base end portions of the front side wall portion 55 and the rear side wall portion 56. A regular insertion hole 67 is formed.

Around the base end portion of the side wall portion, the I-type magnetic core mounting portion 61 is from the front side wall portion 55, the E-type magnetic core yoke portion mounting portion 62 is from the rear side wall portion 56, and the E-type magnetic core left side magnetic portion. The leg mounting portion 63 extends from the left side wall portion 57, and the E-shaped magnetic core right side magnetic leg mounting portion 64 extends from the right side wall portion 58 in a brim shape.

Further, a shielding portion 69 is provided at a position above the front input / output terminal of the I-shaped magnetic core mounting portion 61 so as to cover the input / output terminal. Similarly, a shielding portion 68 is also provided at a position above the rear input / output terminal 62 of the E-type magnetic core yoke portion mounting portion.

Further, at a position above the input / output terminal 42 projecting from the intermediate fitting frame base of the coil bobbin 31, a shielding portion 66 is provided so as to cover the input / output terminal, and the E-type magnetic core side magnetic leg board is installed. It extends from the mounting portions 64 and 63.

A state in which the transformer cover 50 configured as described above is fitted to the winding portion 46 of the coil bobbin 31 and the magnetic core is mounted will be described with reference to FIG.

In FIG. 1, a magnetic core fitting hole is provided with a central magnetic leg 71 made of a magnetic material such as ferrite, and a pair of side magnetic legs 72 and 73 arranged to face each other so as to sandwich the central magnetic leg. , An E-shaped magnetic core 75 molded so as to have one end of the central magnetic leg and one end of each of the pair of side magnetic legs connected to each other is fitted from the rear side wall portion 56 side of the transformer cover 50. Each magnetic leg and yoke portion are mounted on each mounting portion of the transformer cover so as to be inserted and connected to the I-shaped magnetic core 76 mounted on the I-shaped magnetic core mounting portion 61.

Thereafter, the E-shaped magnetic core 75, the I-shaped magnetic core 76, the coil bobbin 31, and the like are fixed by a fixing tool or the like (not shown) to form the transformer 70.

The transformer 70 expresses the transformer function and the like by transmitting and receiving electromagnetic energy corresponding to the turns ratio of the primary side and the secondary side via the E-type magnetic core and the I-type magnetic core.

Although there is only one intermediate fitting frame 32 for the coil bobbin in this embodiment, the coil bobbin according to the present invention is not limited to this, and the coil bobbin having two or more intermediate fitting frames is provided. May be Further, in this case, the shielding portion of the transformer cover that covers the input / output terminals protruding from the intermediate fitting frame base may be extended to each input / output terminal, and two or more input / output terminals may be provided. It may be a shielding part having a structure that covers the terminals.

Further, the magnetic core in the present embodiment is a magnetic path formed by combining the E-shaped magnetic core and the I-shaped magnetic core, but the present invention is not limited to this, and for example, the E-shaped magnetic core is used. A magnetic path may be formed by connecting two magnetic cores facing each other and connecting them.

[0042]

[Effect of the device]

 Since the transformer structure according to the present invention is configured as described above, it has the effects described below.

(1) Since the winding portion of the coil bobbin having the intermediate fitting frame is capped with the embossed cover portion of the transformer cover, it is electrically and mechanically protected from the external environment such as other electronic devices. Moreover, it has an excellent effect that the winding portion can be protected and the reliability such as the transformer function can be improved.

(2) The left side wall portion and the right side wall portion of the transformer cover are respectively positioned between the winding portion and each side magnetic leg of the E-type magnetic core to ensure electrical insulation. Therefore, there is an excellent effect that it is possible to prevent an electrical short circuit from occurring in each of the parts.

(3) A shield portion is extended at a position corresponding to above the input / output terminal at the end of the flange-shaped magnetic core mounting portion of the transformer cover mounted on the coil bobbin around which the winding is wound. Therefore, since the input / output terminals are shielded and protected from the external environment and other components of the transformer, electrical insulation can be ensured, and therefore, especially on the side of inputting / outputting high voltage or large current. The electrical insulation is effective, and therefore, there is an excellent effect that the reliability and safety of an electronic device or the like in which the transformer or the like is incorporated can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a transformer according to the present invention.

FIG. 2 is a perspective view showing a state in which a coil is wound around a coil bobbin in the example.

FIG. 3 is a perspective view of a transformer cover according to the embodiment.

FIG. 4 is a perspective view of a coil bobbin in the same embodiment.

FIG. 5 is a perspective view of a coil bobbin used in a conventional transformer.

FIG. 6 is a perspective view of a conventional transformer.

FIG. 7 is a perspective view of a transformer cover mounted on a conventional transformer.

FIG. 8 is a perspective view of a transformer equipped with a conventional transformer cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coil bobbin 2 winding frame body 3 fitting insertion hole 4 winding part 5 1st fitting frame 6 2nd fitting frame 7 1st base 8 2nd base 9 side surface in the fitting hole direction of 1st base 10th 2 Side surface of the base in the insertion hole direction 11 Input / output terminal 13 Input / output terminal 20 Transformer 21 E-type magnetic core 22 Central magnetic leg 23, 24 Side magnetic leg 25 I-type magnetic core 26 Winding 29 Transformer cover 30 Transformer 31 Coil bobbin 32 Intermediate fitting frame 33 Fitting hole 34 Winding frame body 35, 36 Fitting frame 37 Intermediate fitting frame base 38, 39 Fitting frame base 41, 42, 43 Input / output terminal 46 Winding part 47 Cut groove 48 Winding 50 Transformer Cover 53 Covering Plane Part 55 Front Side Wall Part 56 Rear Side Wall Part 57 Left Side Wall Part 58 Right Side Wall Part 59 Embossed Cover Part 61 I-type Magnetic Core Mounting Part 62 E-type Magnetic Core Yoke Part Mounting Part 63 E Type magnetic core Left magnetic leg mounting part 64 E Magnetic core Right magnetic leg mounting portion 65 Collar-shaped magnetic core mounting base material portion 66 Shielding portion 67 Fitting hole 68 Rear input / output terminal shielding portion 69 Front side input / output terminal shielding portion 70 Transformer 71 Central magnetic leg 72, 73 Side magnetic leg 74 E-type magnetic core yoke portion 75 E-type magnetic core 76 I-type magnetic core

Claims (1)

[Scope of utility model registration request] 1. A winding frame main body having an insertion hole into which a magnetic core is inserted and an external winding being wound, and a mounting frame for narrowing the winding frame main body at both ends. A coil bobbin having an intermediate fitting frame disposed in an outer intermediate portion of the winding frame main body, and a base supporting the both ends and the intermediate fitting frame and having input / output terminals respectively provided therein. And
In a transformer structure formed by combining magnetic cores made of a magnetic material, an embossing having a covering flat surface portion, a side wall portion provided so as to surround the covering flat surface portion, and a magnetic core fitting hole in the side wall portion. -Shaped cover portion, a magnetic core mounting portion that is provided around the edge portion of the embossed cover portion, and the magnetic core mounting portion so as to cover the input / output terminals that project from the base that supports the fitting frame. A transformer structure including a transformer cover having a shielding portion extending on a side surface.