JPH10241959A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent short circuit between a primary coil and a closed magnetic path magnetic core by providing an engagement groove for engagement of the primary coil between primary terminals on the side surface of terminal plate on the back surface side of a bobbin, and providing the engagement groove which stepwise becomes deeper as it approaches the inside part from the outside part. SOLUTION: A primary terminal 31 and a primary coil 18, and, a secondary terminal 21 and a secondary coil 17 are electrically connected with a solder 23, respectively. Further, on the side surface of a terminal plate 22 on the back surface side (Y) of a bobbin 26, an engagement groove 25 for primary coil engagement is provided between primary terminals 31, while the engagement groove 29 is provided so as to stepwise become deeper as it approaches the inside part from the outside part. On the back surface side (Y) of the terminal plate 22 of the bobbin 16, a cut recess 32 is provided in the orientation from the outside part toward the inside part. Thus, a short circuit between the primary coil 18 and a closed magnetic path magnetic core 15 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for use in various consumer appliances.

[0002]

2. Description of the Related Art A conventional transformer will be described below with reference to the drawings.

FIG. 6 is a partially cutaway perspective view of a conventional transformer, FIG. 7 is a side sectional view of the transformer, and FIG. 8 is a plan sectional view between an intermediate flange and a terminal plate of the transformer.

In FIGS. 6 to 8, 1 is a sun-shaped closed magnetic circuit core, 2 is a bobbin, 3 is a primary winding made of a three-layer insulated copper wire, and 4 is a secondary winding made of a copper wire. 5 is a lead portion of the primary winding 3, 6 is a lead portion of the secondary winding 4, 7 is a primary,
A secondary terminal, 8 is a terminal plate on which the primary and secondary terminals 7 are implanted, 9
Is solder, 10 is insulating paper, 11 is an upper end flange, and 12 is an intermediate flange.

A conventional transformer has a bobbin 2 having an upper end flange 11 at an upper end, a terminal plate 8 at a lower end, an intermediate flange 12 between the upper end flange 11 and the terminal plate 8, and a through hole 13 from the upper end to the lower end. A plurality of secondary terminals 7 implanted on the terminal board 8 on the front side X of the bobbin 2 and the terminal board 8 on the rear side Y of the bobbin 2
Primary terminals 7 implanted in the upper end flange 11 and intermediate flange 1
And wound around the bobbin 2 from the front side X to the back side Y via the intermediate flange 12 and the terminal plate 8,
While being wound between the primary winding 3 connected to the primary terminal 7, the upper end flange 11 and the intermediate flange 12, the secondary winding 4 connected to the secondary terminal 7 and the through-hole 13 of the bobbin 2, , A closed magnetic circuit core 1 penetrating the terminal plate 8 on both sides Z of the bobbin 2.

[0006] A locking groove 14 for locking the primary winding is provided between the primary terminals 7 on the side surface of the terminal plate 8 on the rear side Y of the bobbin 2.

[0007]

In the above-mentioned conventional configuration,
Since the depth of the locking groove 14 for locking the primary winding provided between the primary terminals 7 is the same from the outer portion to the inner portion, the primary winding 3 is connected to the intermediate flange 12 and the terminal. Through between the plates 8,
When it is routed from the front side X to the back side Y and connected to the primary terminal 7, if the depth of the locking groove 14 is deep, the primary winding 3 and
When the distance from the closed magnetic circuit core 1 penetrating through both side surfaces of the terminal plate 8 is reduced, short-circuit prevention cannot be achieved, and miniaturization in the direction between the primary terminals 7 (Z direction) results in a primary winding. The space between the locking grooves 14 for locking becomes narrower, and the primary winding 3 is soldered to the primary terminal 7.
When the solder connection or the like is performed, the solder 9
However, there is a problem that the contact causes a short circuit.

The present invention has been made to solve the above-mentioned problems, and is intended to prevent a short circuit between a primary winding and a magnetic core of a closed magnetic circuit, and to reduce the size in the direction between primary terminals. It is an object of the present invention to provide a transformer capable of preventing a short circuit in a transformer.

[0009]

In order to achieve the above object, the present invention comprises an upper end flange at an upper end, a terminal plate at a lower end, an intermediate flange between the upper end flange and the terminal plate, and further comprising an intermediate flange between the upper end and the lower end. A bobbin having a through-hole, a plurality of secondary terminals planted on the terminal plate on the front side of the bobbin, a plurality of primary terminals planted on the terminal plate on the back side of the bobbin; A primary winding connected to the primary terminal while being wound between the flange and the intermediate flange, and routed from the front side to the rear side of the bobbin via the space between the intermediate flange and the terminal plate; And a secondary winding connected between the secondary terminal and the secondary terminal, and a closed magnetic circuit that is inserted into the through hole of the bobbin and penetrates the terminal plates on both side surfaces of the bobbin. A terminal on the back side of the bobbin A configuration in which a locking groove for locking the primary winding is provided between the primary terminals on the side surface of the step, and the depth of the locking groove is provided in a step shape so as to be deeper from an outer portion toward an inner portion. It is.

According to the above construction, the depth of the locking groove for locking the primary winding provided on the side surface of the terminal plate on the back side of the bobbin is made stepwise so as to increase from the outer side toward the inner side. Since the primary winding is routed from the front side to the rear side of the bobbin via the intermediate flange and the terminal plate and connected to the primary terminal, the depth of the outer side locking groove is shallow, so the primary winding Lines and,
The distance between the core and the closed magnetic path core that penetrates the terminal board is not shortened, and a short circuit between the primary winding and the closed magnetic path core can be prevented.

Further, in order to reduce the size in the direction between the primary terminals, even if the space between the locking grooves for locking the primary winding is narrowed, the depth of the locking groove is made deeper on the inner side than on the outer side. In addition, since the locking groove is provided in a step shape, the distance between the primary windings can be maintained, and a short circuit between the primary windings which is likely to occur at the time of solder connection between the primary terminal and the primary winding is also prevented. be able to.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
A bobbin having an upper end flange at an upper end, a terminal plate at a lower end, an intermediate flange between the upper end flange and the terminal plate, and having a through hole from the upper end to the lower end, and a terminal plate on the front side of the bobbin. A plurality of secondary terminals provided, a plurality of primary terminals planted on the terminal plate on the back side of the bobbin, and wound between the upper end flange and the intermediate flange, and between the intermediate flange and the terminal plate. Through the bobbin from the front side to the back side, a primary winding connected to the primary terminal, and a secondary winding connected to the secondary terminal while being wound between the upper end flange and the intermediate flange. A winding, and a closed magnetic circuit core inserted through the through-hole of the bobbin and penetrating the terminal plate on both side surfaces of the bobbin; A locking groove for locking the primary winding is provided between terminals. Both the depth of the locking groove is a structure in which a stepped shape to be deeper toward the outer portion to the inner portion.

With the above construction, the depth of the locking groove for locking the primary winding provided on the side surface of the terminal plate on the back side of the bobbin is made stepwise so as to increase from the outer side toward the inner side. Since the primary winding is routed from the front side to the back side of the bobbin via the intermediate flange and the terminal plate and connected to the primary terminal, the primary The distance between the winding and the closed magnetic path core that penetrates the terminal board is not shortened, and a short circuit between the primary winding and the closed magnetic path core can be prevented.

Further, in order to reduce the size in the direction between the primary terminals, even if the space between the locking grooves for locking the primary winding is narrowed, the depth of the locking groove is made deeper on the inner side than on the outer side. In addition, since the locking groove is provided in a step shape, the distance between the primary windings can be maintained, and a short circuit between the primary windings which is likely to occur at the time of solder connection between the primary terminal and the primary winding is also prevented. be able to.

The second aspect of the present invention is the first aspect.
In the described invention, on the back side surface of the terminal plate of the bobbin,
In this configuration, a cut recess is provided from the outer portion to the inner portion.

According to the above configuration, since the side surface of the terminal plate on the back side of the bobbin is cut toward the inner side to form a recess, the primary winding is connected to the front surface of the bobbin via the intermediate flange and the terminal plate. When the wire is routed from the side to the back side and connected to the primary terminal, the connection to the primary terminal is facilitated, and the production can be improved.

Hereinafter, a transformer according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is a perspective view of the transformer before winding a primary winding thereof, FIG. 3 is a side sectional view of the transformer, and FIG. FIG. 5 is a perspective view of a transformer in which an intermediate flange of the transformer is modified.

1 to 4, a transformer according to an embodiment of the present invention has an upper end flange 25 at an upper end, a terminal plate 22 at a lower end, an intermediate flange 26 between the upper end flange 25 and the terminal plate 22, and The bobbin 16 having a through hole 30 at its lower end, a plurality of secondary terminals 21 planted on a terminal plate 22 on the front side X of the bobbin 16, and a terminal plate 22 on the rear side Y of the bobbin 16 A plurality of primary terminals 31 and upper end flange 25
A plurality of layers are wound and wound between the intermediate flange 26 and the intermediate flange 26 via the insulating paper 24, and the intermediate flange 26 and the terminal plate 22 are rotated about halfway, and the front surface of the bobbin 16 is From the side X to the back side Y, the primary winding 18 of the copper wire connected to the primary terminal 31, the upper end flange 25 and the intermediate flange 26
A secondary winding 17 of a three-layer insulating copper wire connected between the secondary terminal 21 and a through-hole 30 of the bobbin 16.
And a closed magnetic circuit core 15 penetrating the terminal plate 22 on both side surfaces Z of the bobbin 16.

The primary terminal 31 and the primary winding 18 and the secondary terminal 21 and the secondary winding 17 are electrically connected by solder 23, respectively.

Further, the terminal plate 2 on the rear side Y of the bobbin 16
A locking groove 29 for locking the primary winding is provided between the primary terminals 31 on the side surface of the locking member 29, and the locking groove 29 is formed in a step shape so that the depth of the groove increases from the outer side toward the inner side. Provided.

The bobbin 16 also has a concave portion 32 cut from the outer side toward the inner side on the rear Y side surface of the terminal plate 22.

The operation of the transformer having the above configuration will be described below. Terminal plate 2 on the rear side Y of bobbin 16
Since the depth of the locking groove 29 for locking the primary winding provided on the side surface of the step 2 is stepped so as to increase from the outer side to the inner side, the primary winding 18 is Between the front side X and the rear side Y of the bobbin 16 through
When connecting to the primary terminal 31, since the depth of the locking groove 29 on the outer side is shallow, the primary winding 18 and the terminal plate 22
Therefore, the distance between the closed magnetic path core 15 and the closed magnetic path core 15 that penetrates the primary winding 18 can be prevented, and a short circuit between the primary winding 18 and the closed magnetic path core 15 can be prevented.

Further, in order to reduce the size in the direction (Z direction) between the primary windings 18, even if the space between the locking grooves 29 for locking the primary windings is narrowed, the depth of the locking groove 29 is not reduced. Since the inner portion is deeper than the outer portion and the locking groove 29 is provided in a step shape, the distance between the primary windings 18 can be maintained, and the connection of the solder 23 between the primary terminal 31 and the primary winding 18 can be improved. Primary winding 1
It is also possible to prevent short circuit between them.

Further, the terminal board 2 on the rear side Y of the bobbin 16
2 is cut toward the inner side to form a concave portion 32, so that the primary winding 18 is moved from the front side X to the rear side Y of the bobbin 16 via the intermediate flange 26 and the terminal plate 22. When connecting to the primary terminal 31, even if an automatic winding or the like is used, the wiring nozzle of the automatic winding or the like can be easily inserted into the locking groove 29, and the connection to the primary terminal 31 can be easily performed. Improvement can be achieved.

As described above, according to the embodiment of the present invention, it is possible to prevent a short circuit between the primary winding 18 and the closed magnetic circuit core 15 at the time of electrical conduction and to connect the solder 23. At this time, it is also possible to prevent a short circuit between the primary windings 18.

Furthermore, since the connection to the primary terminal 31 is easy, the production can be improved. Note that, in one embodiment of the present invention, the through hole 30 of the bobbin 16 is
However, as shown in FIG. 5, it may be provided on the intermediate flange 26 as well.

[0028]

As described above, according to the present invention, the depth of the locking groove for locking the primary winding provided on the side surface of the terminal plate on the back side of the bobbin is increased from the outer side to the inner side. Because it has a step shape so that it becomes deep, the primary winding is routed from the front side to the back side of the bobbin via the intermediate flange and the terminal plate, and when connecting to the primary terminal, the locking groove of the outer part is Since the depth is small, the distance between the primary winding and the closed magnetic circuit core penetrating through the terminal plate does not become short, and short circuit between the primary winding and the closed magnetic circuit core can be prevented.

Further, in order to reduce the size in the direction between the primary terminals, even if the space between the locking grooves for locking the primary winding is narrowed, the depth of the locking groove is made deeper on the inner side than on the outer side. In addition, since the locking groove is provided in a step shape, the distance between the primary windings can be maintained, and a short circuit between the primary windings which is likely to occur at the time of solder connection between the primary terminal and the primary winding is also prevented. be able to.

[0030] Thus, a transformer capable of preventing a short circuit between the primary winding and the magnetic core of the closed magnetic circuit, and also capable of preventing a short circuit between the primary windings even if the size is reduced in the direction between the primary terminals. Can be provided.

Further, since the side surface of the terminal plate on the back side of the bobbin is cut toward the inside to form a concave portion, the primary winding is connected to the front side of the bobbin via the intermediate flange and the terminal plate. When connecting to the primary terminal from
Connection to the primary terminal is facilitated, and production can be improved.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the transformer before a primary winding is wound.

FIG. 3 is a side sectional view of the transformer.

FIG. 4 is a cross-sectional plan view of the transformer.

FIG. 5 is a perspective view of a transformer in which an intermediate flange of the transformer is modified.

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

FIG. 7 is a side sectional view of the transformer.

FIG. 8 is a plan cross-sectional view between the intermediate flange and the terminal plate of the transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 15 Closed-magnetic-path core 16 Bobbin 17 Secondary winding 18 Primary winding 21 Secondary terminal 25 Upper end flange 26 Intermediate flange 29 Locking groove 30 Through hole 31 Primary terminal

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI H01F 31/00 EH (72) Inventor Hiroshi Hirooka 1006 Ojidoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A bobbin having an upper end flange at an upper end, a terminal plate at a lower end, an intermediate flange between the upper end flange and the terminal plate, and having a through hole from the upper end to the lower end; A plurality of secondary terminals planted on the terminal plate, a plurality of primary terminals planted on the terminal plate on the back side of the bobbin, and wound between the upper end flange and the intermediate flange, and the intermediate flange And between the terminal board and the front side of the bobbin from the front side to the back side, the primary winding connected to the primary terminal, and wound between the upper end flange and the intermediate flange, the secondary terminal And a closed magnetic circuit core inserted into the through hole of the bobbin and penetrating the terminal plate on both sides of the bobbin, and the terminal plate on the back side of the bobbin. Between the primary terminals on the side surface of A transformer having a stop groove and a step-like shape in which the depth of the locking groove increases from the outer side toward the inner side. 2. A concave portion cut from an outer portion to an inner portion on a rear side surface of a terminal plate of a bobbin.
The transformer described.