JP2002343651A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an assembling process and reduce the occurrence of mechanical and electrical noise in a transformer. SOLUTION: The transformer includes a transformer body 2, comprising core members 3 and 4 which are assembled confronting each other and a primary coil 10a and a secondary coil 10b respectively having the different number of turns, and a holder member 6 formed integrally by holding chips 6b and 6c for holding the assembled state of the core members 3 and 4 on a main surface section 6a, having an approximately equal outline to the transformer body 2 and a mounting chip 6d, fixed to a wiring board 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer device having a first core member and a second core member which are combined in an opposed state.

[0002]

2. Description of the Related Art As is well known, a transformer device is used as an electric component having a function of matching voltage, current or impedance, a function of inverting a polarity, a function of distributing power, or a function of converting a balanced circuit into an unbalanced circuit. For example, in electronic devices and the like, it is possible to use by connecting to a different power supply such as a commercial power supply or various battery power supplies,
A transformer device is built in or externally connected in order to transform these power supply voltages to a specified rated voltage for use.

[0003] A transformer device generally combines a first core member and a second core member in a state of facing each other, and has a number of turns on the first core member and the second core member or one of the core members. The transformer main body is configured by mounting a primary coil and a secondary coil different from each other. In the transformer device, the core member is formed of a metal material such as permalloy or a silicon steel plate, or a ferrite material having a high magnetic permeability of Mn-Zn or Ni-Zn.

As shown in FIGS. 9 to 11, various transformer bodies are formed by combining core members having different shapes. That is, the transformer main body 50 shown in FIG. 9 is called a so-called EE type, in which the first core member 51 and the second core member 52 are symmetrical with each other.
It is shaped and formed. The first core member 51 has a pair of side core portions 54 and 55 erected at both ends of a rectangular base portion 53 so as to face each other. A center core portion 56 is provided upright, and has an overall E-shape. The first core member 51 has a center core portion 56 slightly shorter than the side core portions 54 and 55, and a first core member
Is mounted.

[0005] Similarly, a second core member 52 is also provided at both ends of a rectangular base portion 58 so as to face each other.
9 and 60 are erected and these side core portions 5
A center core portion 61 is provided upright at a central portion of each of the components 9 and 60 so as to have an overall E-shape. The second core member 52 has a center core 61 slightly shorter than the side cores 59 and 60, and a second coil 6
2 is attached.

The transformer body 50 includes a first core member 51.
And the second core member 52 are opposed to each other by the side core portion 5.
4, 55 and the side core portions 59, 60 are assembled by abutting each other. In the transformer body 50, the distal end surfaces of the opposing side core portions 54, 55 and the distal end surfaces of the side core portions 59, 60 are joined by an adhesive to be integrated. In this state, the transformer main body 50 is opposed to the center core 5.
An air gap is formed between the distal ends of 6, 61.

The first coil 57 and the second coil 6
The number 2 is such that the coil wire is wound with a different number of turns around the outer periphery of the bobbin 63 having an axial length substantially equal to the length of the side core of the first core member 51 and the second core member 52, although the details are omitted. Thereby, it is comprised as an integral member. Of course, the first coil 57 and the second coil 62 may be configured by winding a coil wire around a bobbin that is a separate member.

The transformer main body 70 shown in FIG. 10 has the same basic structure as that of the EE type transformer main body 50 described above, and a first core member 71 and a second core member 72 each exhibiting an E shape are combined. Be done. Transformer body 7
0 is the first core member 71 and the second core member 72
Is characterized in that the center core portions 73 and 74 formed in are formed in a circular cross section. The transformer main body 70 is called an EER type from such a configuration. The other configuration of the transformer main body 70 is the same as that of the transformer main body 50.
Since these parts are almost the same, the same reference numerals are given for convenience, and the description is omitted.

The transformer body 80 shown in FIG. 11 is formed by combining a first core member 81 formed in an E shape with a second core member 82 formed in an I shape. It is called the so-called EI type. The first core member 81 has a pair of side core portions 84 and 85 erected at both ends of a rectangular base portion 83 so as to face each other, and a center core portion 86 is located at the center of the side core portions 84 and 85. Are formed upright to form an entire E-shape. The first core member 81 includes side core portions 84 and 85
Are slightly shorter than the center core portion 86 and have different numbers of turns.
8 are mounted respectively.

[0010] The second core member 82 is connected to the first core member 8.
The side core portions 84 and 85 are formed in a rectangular shape having a length substantially equal to the interval between the side core portions 84 and 85. The second core member 82 is provided on the side core portion 8 with respect to the first core member 81.
It is combined so as to bridge over 4,85. The transformer body 80 is provided with the center core portion 86 of the first core member 81.
And the inner surface of the second core member 82 are integrated by bonding with an adhesive. The transformer body 80 forms an air gap between the distal end surfaces of the side core portions 84 and 85 of the first core member 81 and the inner surface of the second core member 82.

The above-mentioned transformer bodies 50, 7
At 0 and 80, each core portion is formed to have the same cross-sectional shape. However, for example, the center core portion may be formed to have a smaller cross-sectional shape than the side core portion. The transformer body uses a first core member and a second core member having appropriate shapes and dimensions based on required specifications, and a first coil having a different number of turns and a different specification of a coil wire. A second coil is used.

Each of the above-mentioned transformer bodies is combined with a terminal member to constitute a transformer device. The transformer device 30 shown in FIGS. 6 to 8 is formed by combining the terminal member 31 with the EE type transformer main body 50 described above. The transformer body 50 is provided with side core portions 54, 5 of the first core member 51.
5 and the side core portions 59 and 60 of the second core member 52 are joined to each other by the adhesive 32 at their opposing end surfaces, so that they are integrated in a substantially Japanese character shape. As shown in FIG. 6, the transformer body 50 has an air gap formed between opposing end surfaces of the center core portion 56 and the second center core portion 58 of the first core member 51.

As shown in FIGS. 7 and 8, the transformer device 30 is combined with the terminal member 31 while the transformer body 50 is laid on its side, and is integrated by, for example, an adhesive. A plurality of terminals such as a pair of input terminals 33 to which the first coil 57 is connected, a pair of output terminals 34 to which the second coil 62 is connected, or a ground terminal 35 are provided on the bottom surface of the terminal member 31. Have been. Transformer 3
No. 0 is mounted on a wiring board (not shown) by soldering these terminal groups to lands or the like.

When the transformer 30 is energized to obtain a transformed output from, for example, the second coil 62 by energizing the first coil 57, the transformer main body 50 is charged and the transforming characteristics are degraded. For this reason, the transformer device 30 includes:
An earth plate 36 is attached to the transformer body 50, and the earth plate 36 is connected to an earth terminal 35 of the terminal member 31 by an earth wire 37. The transformer device 30
In this way, the configuration is such that the potential of the transformer main body 50 is kept constant in a use state and a stable operation is performed.

[0015]

A conventional transformer device 3
In the case of No. 0, the bonding step with the adhesive 32 was necessary to integrate the first core member 51 and the second core member 52 as described above. Conventional transformer device 30
, A ground plate 36 for keeping the ground potential of the transformer body 50 constant, a process for attaching the ground plate 36, and a ground plate 36 with a ground wire 37.
And a step of connecting the ground terminal 35 to the ground terminal 35 is required. Therefore, the conventional transformer device 30 has a problem that the number of manufacturing steps increases and the cost increases.

Further, in the conventional transformer device 30, the transformer main body 50 is configured by being combined with the terminal member 31, as described above, and mounted on a wiring board via the terminal member 31. The transformer device 30 has a relatively large weight, and the mounting state between the transformer main body 50 and the terminal member 31 or the wiring board tends to vary.
When the transformer device 30 is mounted on the main device, when the vibration or the like is applied, for example, the transformer body 50 and the terminal members 31 or the core members 51 and 52 and the bobbin 63 collide with each other, and a rattling sound is generated. was there.

Further, in the conventional transformer device 30, a switching function in which an air gap is formed between the center core portion 56 of the first core member 51 and the center core portion 61 of the second core member 52 as described above. , An electromagnetic wave is generated between the center core portions 56 and 61. For this reason, the conventional transformer device 30 has a problem in that electric noise is generated, thereby affecting other electronic components and circuits mounted on the wiring board.

Accordingly, the present invention has been made in view of the above-mentioned problems of the conventional transformer device, and aims to streamline the assembly process and reduce the occurrence of mechanical rattling noise and electrical noise. The purpose is to provide.

[0019]

According to the present invention, there is provided a transformer for achieving the above object, comprising a first core member and a second core member.
And a transformer body composed of a primary coil and a secondary coil, and a holder member assembled to the transformer body to integrate the first core member and the second core member. The first core member and the second core member are combined so as to face each other, and a primary coil and a secondary coil having different numbers of turns are mounted on each or one of them. The holder member has a main surface portion having substantially the same outer shape as the side surface of the transformer main body, and a side surface corresponding to a combined portion of the first core member and the second core member from the opposite side edge of the main surface portion. It comprises at least one pair of bent holding pieces and a mounting piece bent from the main surface and soldered to the wiring board.
The transformer device is configured such that, in a state where the holder member is combined with the transformer body, the first core member and the second core member are sandwiched by the holding pieces and the combined state is held.

In the transformer device, an opening is formed in the holder member so that the primary coil and the secondary coil face outward, and each coil bobbin is held by the inner wall surface facing the opening. You.

According to the transformer device of the present invention configured as described above, the first core member and the second core member are integrated by the holder member by being sandwiched by the holding pieces. This eliminates the need for an adhesive bonding step. Further, according to the transformer device, since the mounting piece of the holder member is fixed to the land formed on the wiring board by soldering, the transformer body has a mounting portion for directly mounting to the wiring board. A stronger attachment will be made. Furthermore, according to the transformer device, the mounting piece functions as a ground terminal, and the ground plate, the ground wire, and the mounting process thereof are not required. further,
According to the transformer device, since the holder member covers the transformer main body and constitutes an electromagnetic shield case, problems caused by electromagnetic noise are reduced, and reliability is improved.

Further, according to the transformer device, since the holder bobbin has a structure in which the bobbin of the coil is made to face the opening, the bobbin is held between the core of each core member and the inner hole of the bobbin. Even if there is a clearance, the occurrence of rattling noise due to collision of these with vibration and the like is suppressed. According to the transformer device, the rattling noise between the transformer body and the terminal member is suppressed even from the structure in which the transformer body is directly attached to the wiring board via the above-described attachment piece.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. A transformer device 1 shown as an embodiment includes a transformer main body 2 in which a pair of E-shaped core members 3 and 4 having a symmetrical shape on the front and back are combined and a coil member 5 is mounted, a holder member 6 and a terminal member 7. And is directly mounted on the wiring board 8 for use. The present invention can be applied not only to the transformer body 2 formed by combining the E-shaped core members 3 and 4 but also to the above-mentioned EER-type or EI-type transformer device.

In the transformer main body 2, the core members 3, 4 and the coil member 5 have the same configuration as the core member and the coil member of the above-described conventional transformer device. The core members 3 and 4 are made of, for example, a ferrite material having high magnetic permeability such as Mn—Zn or Ni—Zn, and a pair of side core portions 3b opposed to both ends of the rectangular base portions 3a and 4a, respectively. , 3c, 4b, and 4c, and the center core portion 3 is located at the center of the side core portions (3b, 3c) and (4b, 4c).
d and 4d are formed so as to present an overall E-shape in which they are integrally erected. Each of the core members 3 and 4 is connected to each of the side core portions (3
b, 3c) and (4b, 4c) for the center core 3
d and 4d are slightly shorter axes. The core members 3 and 4
Opposing side core portions (3b, 3c), (4b, 4c)
Are combined.

The coil member 5 comprises a bobbin case 9 and a coil 10. Although not described in detail, the bobbin case 9 has an axial length substantially equal to the length of the center core portions 3d, 4d of the core members 3, 4, and has a core hole having an inner diameter sufficient to penetrate the center core portions 3d, 4d. It comprises a bobbin main body and flange portions 9a and 9b integrally formed around both ends of the bobbin main body. Coil 10
Are a primary coil 10a having a different number of turns and a secondary coil 1
0b. The primary coil 10a is formed by winding a coil wire from an end of the bobbin main body in a range slightly smaller than the length of the center core 3d. Secondary coil 10b
Is formed by winding a coil wire in a range from the other end of the bobbin main body to a region slightly smaller than the length of the center core portion 4d.

The holder member 6 is made of a metal plate having conductivity and elasticity, and a pair of holding pieces 6b and 6c and a mounting piece 6d are formed integrally with the main surface 6a.
As shown in FIGS. 1 and 3, the holder member 6 includes a main surface portion 6.
a is made substantially equal to the interval between the base portions 3a, 4a of the core members 3, 4 whose widths are combined, and the length thereof is set to the side core portions (3b, 3c) of the core members 3, 4.
It is formed substantially equal to the interval of (4b, 4c). In other words, the main surface 6a of the holder member 6 has a rectangular shape having an outer shape substantially equal to the planar shape of the transformer body 2 in which the core members 3 and 4 are combined.

The holder member 6 has a rectangular opening 6e in the main surface 6a. The opening 6e is formed with an opening dimension sufficient to allow the coil member 5 combined with the core members 3 and 4 to face outward as described later. The opening 6e holds the flanges 9a and 9b of the coil member 5 with the inner peripheral wall as described later.

The holder member 6 has holding pieces 6b and 6c.
The main surface portions 6a are integrally bent downward along the widthwise side edges of the main surface portion 6a so as to face each other in parallel. Each holding piece 6b, 6c is attached to each core member 3, 4
The length is slightly shorter than the thickness of the main surface portion 6a, and is bent so that each end portion is located inward with respect to the side edge of the main surface portion 6a. Therefore, each holding piece 6b,
6c, the interval between the tip portions is equal to the base portion 3 of the core members 3, 4.
The distances a and 4a are slightly smaller. The holding pieces 6b, 6c abut on the side surfaces of the base portions 3a, 4a of the combined core members 3, 4, as described later, and hold the combined state.

The holder member 6 has a mounting piece 6d integrally bent downward at one side edge in the length direction. The attachment piece 6d is a rectangular piece having a longer axis than the thickness of each of the core members 3 and 4, and a narrow connection terminal portion 6f is continuously provided at the tip end.

The terminal member 7 is the same as the terminal member 31 of the conventional transformer device 30 described above, and includes a main body 7a to which the transformer main body 2 is combined and a terminal 7b provided with a plurality of terminals. . The terminal members 7 are combined by, for example, bonding with an adhesive in a state where the transformer main body 2 is laid on the main body 7a in a horizontal state, and integrated. The terminal member 7 is provided with a pair of input terminal pins 7c to which the primary coil 10a of the coil member 5 is connected and a pair of output terminal pins 7d to which the secondary coil 10b is connected, on the bottom surface of the main body 7a. Have been.

On the wiring board 8, a predetermined circuit pattern is formed, and various electronic components and electric components constituting a power supply circuit portion are mounted. The wiring board 8 has a terminal hole in which each terminal pin of the terminal member 7 fits and a terminal hole in which the connection terminal portion 6f of the holder member 6 fits. A ground pattern is formed on the wiring board 8 corresponding to the fitting terminal hole into which the connection terminal portion 6f is fitted.

In the transformer device 1, the core members 3, 4 are combined by abutting the respective side core portions (3b, 3c) and (4b, 4c). In the transformer device 1, the transformer body 2 is configured by inserting the center core portions 3d, 4d to be abutted into the core holes, and combining the coil members 5 with the core members 3, 4. The transformer device 1 includes a holder member 6 with respect to the transformer body 2.
Is assembled, the combined state of the core members 3, 4 and the coil member 5 is maintained.

In the transformer device 1, the holding pieces 6b,
The holder member 6 is combined with the coil main body 2 with the base member 6c corresponding to the base portions 3a, 4a of the core members 3, 4. In the transformer device 1, when the holder member 6 is pushed into the coil main body 2 in this state, the holding pieces 6b, 6c
Is opened outward and accumulates elastic force while the base portion 3a,
It moves downward along the side surface 4a. Transformer device 1
In, the holder member 6 is pushed until the main surface portion 6a comes into contact with the surface of the coil body 2. In the transformer device 1, in this state, the holding pieces 6b, 6c press the side surfaces of the base portions 3a, 4a by the accumulated elastic force, so that the combined state of the core members 3, 4 is firmly held.

In the transformer device 1, the coil member 5
Are made to face outward from the opening 6e of the holder member 6, and the flanges 9a, 9b of the bobbin case 9 as shown in FIG.
Is held by the inner wall surface of the opening 6e. In the transformer device 1, the core members 3, 4 are held by the holder member 6 by being held by the holding pieces 6 b, 6 c, and the coil member 5 is also held by the holder member 6. Therefore, in the transformer device 1, even if vibration is applied due to clearance between the center core portions 3d and 4d of the core members 3 and 4 and the coil member 5, rattling noise generated by collision of these members is generated. It will be suppressed.

In the transformer device 1, as described above, the transformer body 2 held by the holder member 6 is combined with the terminal member 7, and the primary coil 10a of the coil member 5 is connected to the input terminal 7c of the terminal member 7. And the secondary coil 10 of the coil member 5 is connected to the output terminal 7d.
b is connected. In this state, in the transformer device 1, the connection terminal portion 6 f connected to the mounting piece 6 d of the holder member 6 in this state.
However, as shown in FIG. 2 and FIG.
And protrudes toward the bottom surface of the terminal member 7 with substantially the same length.

The transformer device 1 configured as described above
Is a wiring board 8 with the terminal portion 7b of the terminal member 7 being the mounting side.
Implemented in In the transformer device 1, each terminal of the terminal member 7 is fitted into each terminal hole formed in the wiring board 8, and the connection terminal portion 6f of the holder member 6 is also fitted into the terminal hole. In the transformer device 1, the lower end of the mounting piece 6 d connecting the connection terminal portions 6 f abuts on the main surface of the wiring board 8.
The transformer device 1 is mounted and fixed on the wiring board 8 by, for example, performing flow soldering, thereby performing soldering between each land projecting from each terminal hole to the back surface of the wiring board 8 and a land. .

In the transformer device 1, since the mounting pieces 6d are also soldered to the lands of the wiring board 8, the holder member 6 holding the transformer main body 2 is mechanically fixed to the wiring board 8. Therefore, in the transformer device 1,
The transformer main body 2 is held firmly mechanically, and even when vibration or the like is applied, generation of rattling noise or the like from each part is suppressed, and a firm mounting is performed. In the transformer device 1, the transformer main body 2 is assembled without requiring the bonding step of the transformer main body 2 with an adhesive, so that the assembling process can be greatly rationalized.

The transformer device 1 is energized from the wiring board 8 side to the coil member 5 to perform a predetermined voltage changing operation. When the transformer device 1 is mounted on the wiring board 8 described above, the holder member 6 is connected to the ground pattern via the connection terminal 6f. Therefore, in the transformer device 1, the transformer main body 2 is charged during the voltage changing operation, but the connecting terminal portion 6f connected to the mounting piece 6d is provided.
The potential is kept constant by grounding via. As a result, in the transformer device 1, a reduction in the transforming characteristics is suppressed, and a stable operation is performed.

As described above, the transformer device 1 has a structure in which the surface of the transformer main body 2 is covered by the main surface portion 6a of the holder member 6 formed of a conductive material. Therefore, in the transformer device 1, the holder member 6 electromagnetically shields the transformer main body 2 to reduce electromagnetic noise generated from the air gap between the core members 3 and 4, and the electronic components mounted on the wiring board 8 The reliability is improved so as not to adversely affect each circuit unit.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements can be made within the technical scope described in the claims. For example, as described above, the transformer device 1 is formed by integrally bending the attachment piece 6d on one side edge of the holder member 6 in the longitudinal direction, but it is a matter of course that the present invention is not limited to such positions and numbers. . In the transformer device 1, when the holder member 6 is combined with the transformer body 2, the holding pieces 6 b and 6 c are attached to the base portions 3 a and 4 of the core members 3 and 4.
There is a fear that the side surface a may be damaged by sliding while being pressed. The holder member 6 is provided with a holding piece 6b for this purpose.
The tip of 6c may be formed in an arc shape.

[0041]

As described in detail above, according to the transformer device of the present invention, the first core member and the second core member are integrated by the holder member by being held by the holding piece. This eliminates the need for the bonding step of bonding the first core member and the second core member with an adhesive, thereby streamlining the assembly process. Further, according to the transformer device, the mounting piece of the holder member is soldered and fixed to the land formed on the wiring board, so that the transformer body is directly mounted on the wiring board via the holder member, so that a strong mounting is achieved. Will be done. further,
According to the transformer device, since the mounting piece functions as the ground terminal, the ground plate, the ground wire, and the mounting process thereof are not required. Further, according to the transformer device, since the holder member covers the transformer main body and forms an electromagnetic shield case, problems caused by electromagnetic noise are reduced and reliability is improved.

Further, according to the transformer device, since the bobbin of the coil whose holder member faces the opening is held, the transformer device is provided between the core of each core member and the inner hole of the bobbin. Even if there is a clearance, the occurrence of rattling noise due to collision of these components against vibration or the like is suppressed, and breakage of the core member is also prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a transformer device shown as an embodiment of the present invention.

FIG. 2 is a front view of a main part of the transformer device.

FIG. 3 is a side view of a main part of the transformer device.

FIG. 4 is a perspective view of a holder member provided in the transformer device.

FIG. 5 is a side view of the holder member.

FIG. 6 is a plan view of a main part of a conventional transformer device.

FIG. 7 is a front view of a main part of the transformer device.

FIG. 8 is a side view of a main part of the transformer device.

FIG. 9 is a perspective view of an EE-type coil provided in the transformer device.

FIG. 10 is a perspective view of an EER coil provided in the transformer device.

FIG. 11 is a perspective view of an EI coil provided in the transformer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer device 2 Transformer body 3 Core member 4 Core member 5 Coil member 6 Holder member 6a Main surface 6b Holding piece 6c Holding piece 6d Mounting piece 6e Opening 6f Connection terminal part 7 Terminal member 8 Wiring board 9 Bobbin case 10 Coil

Claims (2)

[Claims] A first core member and a second core member are combined in a state where they face each other, and the number of turns mounted on the first core member and the second core member or one of the core members is provided. A main body comprising a primary coil and a secondary coil different from each other; a main surface having substantially the same outer shape as a side surface of the transformer main body; and a first core member and a second main member which extend from opposite side edges of the main surface. At least one pair of holding pieces bent respectively corresponding to the side faces opposite to the combination part of the core member, and formed from the main surface part and soldered to the land of the wiring board to form an attachment part. A holder member comprising a mounting piece, wherein the holder member sandwiches the first core member and the second core member with the holding piece and holds the combined state thereof, Trans and wherein the combined in Nsu body. 2. The transformer device according to claim 1, wherein an opening for holding the bobbin of the primary coil and the secondary coil is formed in the holder member by opposing inner wall surfaces.