JPH0612737B2 - Trance - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer which can easily fix a core to be inserted in the transformer.

[0002]

2. Description of the Related Art Conventionally, a transformer has a core through which magnetic flux passes,
It consists of primary and secondary coils that induce electromotive force, and an outer box that houses these coils.The AC voltage and current flowing through the primary winding is increased or decreased depending on the number of times each coil is output, and the output from the secondary winding is output. It is what makes me.

Further, as one form of the above transformer, there is one in which a primary bobbin is housed in a secondary bobbin around which a coil is wound and a core is inserted into the primary bobbin in order to make the transformer compact. . Further, the transformer is housed in an outer box, and an insulating resin is filled in the outer box to insulate the transformer.

Therefore, in order to make the transformer compact, a primary bobbin having a core insertion hole is housed in the secondary bobbin, the core is inserted into the insertion hole, and a transformer case is attached to the secondary bobbin. Further, there has been one in which a split core is attached outside the core insertion hole of the primary bobbin and the case.

[0005]

However, the above-mentioned transformer has the following problems.

That is, when the core is attached to the outside of the transformer case, it does not have a member for supporting the core.
The core could not be easily supported.

Further, in order to ensure safety, the core of the transformer is grounded and connected to the circuit board.
The transformer must be separately provided with a ground mounting portion, and in this case, it was necessary to secure the ground mounting portion and to mount the ground.

An object of the present invention is to provide a transformer which can solve the above problems.

[0009]

According to the present invention, a primary bobbin having a core insertion hole is housed in a secondary bobbin, a core is inserted into the insertion hole, and a transformer case is attached to the secondary bobbin. Further, in a transformer in which a ring-shaped core is mounted outside the core insertion hole of the primary bobbin and the case, the other end of the core inserted into the core insertion hole is supported on the outer peripheral surface of the transformer case. The present invention provides a transformer, which is characterized by being provided with a core support.

Further, according to the present invention, in the above-mentioned transformer, upper and lower core support members are provided on the outer peripheral surface of the transformer case at regular intervals so as to be inserted into the core insertion holes between the support members. The other end of the core is arranged.

According to the present invention, in the above transformer, a metal core connector for integrally sandwiching the core and the core support is mounted, and further, the connector is extended downward to form a circuit board. It is characterized in that it can be connected to, and the connecting tool is grounded.

[0012]

According to the present invention, the primary bobbin is housed in the secondary bobbin, and the transformer case is fitted around the secondary bobbin in a fitted state to assemble the transformer. Furthermore, when mounting the core in the core insertion hole of the primary bobbin, the core is supported by the core supporting body provided on the outer peripheral surface of the transformer case, and moreover, the core connecting tool is mounted on the core and the core supporting body, The core is clamped and fixed integrally, and the cores are easily connected.

Further, the lower part of the metallic core connector for sandwiching and fixing the core is extended, the extended part is connected to the circuit board, and the connector is used as a ground.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail with reference to the drawings. In the perspective view of FIG. 1, reference numeral 1 denotes a transformer, which is mounted on a substrate and used in a copying machine or the like. The transformer 1 includes a small-diameter primary coil 2, a large-diameter secondary coil 3 capable of accommodating the same primary coil 2, and a split core 4 inserted into each coil 2, 3. , And a transformer case 5 that houses the coils 2 and 3.

As shown in FIGS. 7 to 9, the primary coil 2 is formed by winding a winding a on the outer peripheral surface of a small-diameter cylindrical primary bobbin 6, and inside thereof, a part of the core 4 is formed. A core insertion hole 7 for inserting is provided. A core holding base 8 communicating with the core insertion hole 7 is projectingly provided on one side of the primary bobbin 6, and a plurality of primary coil pins connected to the circuit board are provided on the lower surface of the holding base 8. 9 is projected,
The winding a is connected to each pin 9.

Further, the outer peripheral surface of the primary bobbin 6 is notched in the upper and lower sides thereof so that the bobbin 6 has an elliptical shape to maintain a distance from the secondary bobbin 10.

As shown in FIG. 6, the secondary coil 3 is formed by winding a winding a around an outer peripheral surface 10a of a large-diameter cylindrical secondary bobbin 10 and accommodating the primary bobbin 6 therein. A bobbin insertion hole 11 is provided. Further, the transformer case 5 is fitted to both ends of the secondary bobbin 10 so that the outer wall 1 having a slightly large diameter is fitted.
2 and 12 are installed and winding a is formed between the outer walls 12 and 12.
Is wound.

In this embodiment, as shown in FIG. 6, the outer peripheral surface 10a of the secondary bobbin 10 is gradually thickened in one direction along the axis and a plurality of partition walls 13 are provided in a protruding manner. Then, the number of windings of the winding a is increased between the respective partition walls 13, and furthermore, each partition wall 13 is provided with a coil communicating notch 14 so that the respective partition walls 13 are communicated in a flush manner. Winding a is continuously wound.

Further, an overhanging case 15 having a curved surface 15a in FIG. 10 is provided on one side of the secondary bobbin 10, and the lower surface of the case 15 is opened and the case 15 is opened.
A secondary coil pin 16 is provided so as to project therein, and one end of the winding a is connected to the pin 16 so that the winding a is wound around the secondary bobbin 10.

In this embodiment, as shown in FIGS. 4 and 12, the overhanging case 15 is provided with a guide groove 17 extending from the secondary coil pin 16 to the outer peripheral surface 10a of the secondary bobbin 10, and along the guide groove 17. The winding a is arranged so that smooth winding can be performed. Reference numeral 15b denotes a coil conduction hole provided in the overhanging case 15 to the secondary coil pin 16.

Further, on one side of the secondary bobbin 10, FIG.
At the outer wall 12, the primary bobbin connecting projection 18 is projected, and the primary bobbin 6 and the secondary bobbin 10 are connected by inserting the projection insertion hole 19 provided in the primary bobbin 6 into the projection 18. . Further, on the other side of the secondary bobbin 10, as shown in FIG. 10, a longitudinal bobbin support base 20 having an open lower surface is provided, and the circular arc surface 20a formed on the support base 20 is The secondary bobbin 10 is supported by applying an L-shaped claw-shaped projection 21 projecting from one end of the secondary bobbin 10.

In this embodiment, as shown in FIG. 4, a resistor 22 is provided in the bobbin support 20, and one end of the resistor 22 is
A lead wire 23 that connects one end of the winding a wound around the secondary bobbin 10 to the other end of the resistor 22 and connects to the substrate.
Are connected. Reference numeral 24 represents a resistance mounting pin provided in the bobbin support base 20. 10 and 12, a lead wire hole 25 for projecting the lead wire 23 outward is provided on one side of the bobbin supporting base 20, and the lead wire hole 25 is also provided.
A fixing claw 25a is provided on the inner peripheral surface of 25, and the fixing wire 25a prevents the lead wire 23 from rotating.

In the present invention, as shown in FIGS. 6 and 10, a plurality of communication holes 26 for filling the insulating resin are provided on the outer peripheral surface 10a of the secondary bobbin 10 for connecting the secondary bobbin 10 and the primary bobbin 6. And the transformer 1 assembled by the communication hole 26.
When the insulating resin is filled in, the insulating resin is filled in the bobbin insertion hole 11 to insulate the primary coil 2.

Next, the transformer case 5 is shown in FIGS.
As shown in FIG. 3, the hook 27 is formed in a substantially U shape in a side view, and the lower end thereof is provided with a hook 27 for connecting to the substrate, and the outer walls 12, 12 of the secondary bobbin 10 are provided at the left and right peripheral portions thereof. A fitting wall 28 for fitting is provided. Then, as shown in FIG. 5, the transformer case 5 is mounted on the outer side walls 12, 12 of the secondary bobbin 10 to cover the front and rear portions and the upper portion of the secondary bobbin 10. Further, in FIG. 6, the transformer case 5
When mounting the secondary bobbin 10 on the upper edge of the mating wall 28
28a fits into the grooves 29 at both ends of the primary bobbin 6 housed in the secondary bobbin 10, and the primary bobbin 6 and the secondary bobbin 10
Also, the transformer case 5 is integrally fixed.

Further, on the peripheral surface of the transformer case 5, as shown in FIG.
Also, in FIG. 5, upper and lower core support members 30 and 31 for supporting the core 4 attached to the outside thereof are provided in a protruding manner, and one side portion of the core 4 is provided between the core support members 30 and 31. It is arranged.
In this embodiment, the upper core support 30 is provided with a mounting recess 30a for mounting the lead wire 23. The lead wire 23 is mounted in the recess 30a and the lead wire 23 is arranged along the transformer 1. It is possible to install and change the direction of the lead wire 23.

In the present invention, the core 4 is divided into two parts on the left and right sides, and when the transformer 1 is assembled, one end of the core 4 is inserted into the core insertion hole 7 of the primary bobbin 6 to support the upper and lower cores. The other side portions of the core 4 are joined between the bodies 31. Further, in this state, as shown in FIG. 1, the core connector 32 is attached to the left and right lower core support members 31 and the upper side surface of the core 4 in a sandwiched state, and the core connector 32 is divided into two parts. The core 4 is fixed.

In this embodiment, the core connector 32 is provided in the U-shaped right and left holding bodies 33, the extension portion 34 in which the lower portion of the holding body 33 is extended downward, and the middle portion of each holding body 33. In addition, the distal end portion of the extension portion 34 is connected to the substrate, and the connection tool 32 also serves as the ground. further,
The lower core support 31 is formed in an inverted U-shape having an opening at the bottom, and the extension part 34 of the core connector 32 is provided in the support 31.
Have been inserted.

The core connecting tool 32 is mounted on the connecting portion of the core 4 and holds each part of the core 4 between the left and right winding holding bodies 33 for reliable connection.

With such a configuration, the primary bobbin 6 is housed in the secondary bobbin 10, the transformer case 5 is mounted around the secondary bobbin 10 in a fitted state, the transformer 1 is assembled, and the core of the primary bobbin is inserted. When mounting the split core 4 in the hole 7, the core 4 is supported between the upper and lower core supports 30 and 31 provided on the outer peripheral surface of the transformer case 1, and the core 4 and the lower core support are supported. 31 and 31 are integrally sandwiched and fixed by a core connecting tool 32, and the core 4 is easily connected.

Further, the lower portion of the metal core connector 32 for holding and fixing the core 4 can be extended, and the extension portion 33 can be connected to the circuit board to use the connector 32 as ground.

Next, the winding structure of the winding a on the primary bobbin 6 will be described in detail. In this embodiment, as shown in FIGS. 8 and 9, the left and right hooking protrusions 3 are provided on the front surface of the core holding base 8.
6 and 36 are provided, and a winding guide groove 37 is provided between the protrusions 36 and 36 from the lower surface of the primary bobbin 6, and the protrusions 36 and 36 and the winding guide groove 37 provided on the primary bobbin 6 are provided. The winding a is wound by using the claw-shaped projection 21.

Moreover, the winding a is connected to the three primary coil pins 9 provided on the primary bobbin 6, and the number of windings of the winding a in the primary coil 2 is changed by selecting each pin 9. .

Further, the pins 9 and 16 provided on the primary bobbin 6 and the secondary bobbin 10 are formed in a quadrangular cross section, and when the winding a is wound, it is pulled by a constant force to The winding a is cut at the corners of the pins 9 and 16.

In this embodiment, in the transformer 1 having the above-mentioned structure, the insulating resin is filled from the lower surface of the transformer 1,
The space between the secondary bobbin 10 and the transformer case 5, and the secondary bobbin
The space between the secondary bobbin 10 and the primary bobbin 6 is filled through a communication hole 26 provided in the secondary bobbin 10 to insulate the space.

[0035]

Therefore, according to the present invention, when the core is mounted in the core insertion hole of the primary bobbin, the other end of the core is supported by the core support provided on the outer peripheral surface of the transformer case. The core and the core support can be integrally clamped and fixed to easily connect the cores. Also, extend the bottom of the metal core connector that holds and fixes the core,
By connecting the extension portion to the circuit board and using the connecting tool as a ground, it is possible to secure the ground mounting portion and eliminate the complexity of the mounting work.

[Brief description of drawings]

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

FIG. 2 is a plan view of the transformer.

FIG. 3 is a side view of the transformer.

FIG. 4 is a bottom view of the transformer.

FIG. 5 is an explanatory diagram showing a disassembled state of the transformer.

6 is a cross-sectional view taken along line I-I of FIG.

FIG. 7 is a side view of the primary bobbin.

FIG. 8 is a front view of a primary bobbin.

FIG. 9 is a bottom view of the primary bobbin.

FIG. 10 is a plan view of a secondary bobbin.

11 is a sectional view taken along line II-II of FIG.

12 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 transformer 2 primary coil 3 secondary coil 4 core 5 transformer case 6 primary bobbin 10 secondary bobbin 30 upper core support 31 lower core support 32 core connector

Claims (3)

[Claims] 1. A primary bobbin 6 having a core insertion hole 7 is housed in a secondary bobbin 10, a core 4 is inserted in the insertion hole 7, and a transformer case 5 is mounted on the secondary bobbin 10. Furthermore, the core insertion hole 7 of the primary bobbin 6 and the same case
In the transformer 1 in which the ring-shaped core 4 is attached to the outside of the core 12, a core support 30 that supports the other end of the core 4 inserted into the core insertion hole 7 is provided on the outer peripheral surface of the transformer case 5. A transformer characterized by being provided. 2. In the above-mentioned transformer 1, upper and lower core support members 30 and 31 are provided on the outer peripheral surface of the transformer case 5 at regular intervals, and a core is inserted between the support members 30 and 31. The transformer according to claim 1, wherein the other end of the core 4 inserted into the hole 7 is provided. 3. In the above transformer 1, a metal core connector 32 for integrally sandwiching the core 4 and the core support 31.
2. The transformer according to claim 1, wherein the transformer 32 is attached, and the connector 32 is extended downward to be connectable to a circuit board, and the connector 32 is grounded.