JPH0612738B2 - Transformer primary bobbin - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a transformer primary bobbin.

[0002]

2. Description of the Related Art Conventionally, a transformer has an iron 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-mentioned transformer, there is one in which a primary bobbin is housed in a secondary bobbin around which a coil is wound and an iron 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, in the transformer, the winding is wound around the outer peripheral surface of the primary bobbin and housed in the secondary bobbin, both ends of the windings of the primary and secondary coils are connected to the circuit board, and the same. The cord wire was extended from the circuit board.

However, a plurality of primary coil pins are provided on one end of the primary bobbin so that they can be easily connected to the circuit board, and moreover, the plurality of primary coil pins connect the windings to the respective pinners. By doing so, the capacity of the primary coil can be changed by energizing each pin.

For this reason, the winding is wound around the primary bobbin only in one direction, but in order to connect the winding to each pin, the direction of the winding must be changed. The primary bobbin was not configured to change the winding direction or the like.

It is an object of the present invention to provide a transformer primary bobbin which can solve the above problems.

[0010]

According to the present invention, a primary bobbin having a core insertion hole is accommodated in a bobbin insertion hole provided in a secondary bobbin, and a core is inserted into the core insertion hole. A plurality of primary coil pins that connect windings to the same bobbin are projected on one end of the primary bobbin, and left and right claw-shaped projections that lock the winding are projected on the other end of the same bobbin. A primary bobbin for the transformer, which is characterized by being installed.

Further, according to the present invention, in the above-mentioned primary bobbin of the transformer, a pin holder is provided at one end of the primary bobbin, and a plurality of primary coil pins are projectingly provided on a lower surface of the holder.
The holding body is characterized in that a protrusion for locking the winding for connecting the winding to the primary coil pin is projected.

Further, according to the present invention, in the above-described primary bobbin of the transformer, the outer peripheral surfaces of the left and right claw-shaped projections provided on the primary bobbin are formed in a curved shape, and the bobbin insertion hole 11 of the secondary bobbin is formed.
It is characterized in that the primary bobbin can be supported on the inner peripheral surface of the so as to be spaced apart.

[0013]

According to the present invention, when the winding is wound around the primary bobbin, one end of the winding is connected to the primary coil pin, the winding is wound around the bobbin, and the other end is left and right. The winding is locked to the claw-shaped protrusion to change the direction of the winding to connect with each coil pin, and moreover, the winding locking protrusion provided on the primary bobbin is used to connect the same. The winding wound around the bobbin is connected to each primary coil pin.

Further, since the outer peripheral surface of the claw-shaped projection provided on the primary bobbin is formed in a curved shape, when the primary bobbin is inserted into the bobbin insertion hole of the secondary bobbin, the claw-shaped projection is the bobbin insertion hole. It abuts the inner peripheral surface of to support the primary bobbin in a stable state.

[0015]

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. 4 to 6, 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 the core a part of the core 4 is wound. A core insertion hole 7 for inserting is provided. In addition, a pin holder 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 holder 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 FIGS. 2 and 3, the secondary coil 3 is formed by winding a winding a on the outer peripheral surface of a large-diameter cylindrical secondary bobbin 10, and the primary bobbin 6 is provided therein. A bobbin insertion hole 11 for accommodating the is provided. Further, outer walls 12 and 12 having a slightly larger diameter to which the transformer case 5 is fitted are attached to both ends of the secondary bobbin 10, and a winding a is wound between the outer walls 12 and 12.

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 partition walls 13, and each partition wall 13 is provided with a coil communication notch so that the space between the partition walls 13 is communicated with each other. a is continuously wound.

Further, on one side of the secondary bobbin 10, as shown in 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. . On the other side of the secondary bobbin 10, as shown in FIG. 3, an elongated bobbin support base 20 having an open lower surface is provided, and an arc surface 20a formed on the support base 20 has An L-shaped claw-shaped projection 21 is provided on one end of the secondary bobbin 10 to support the primary bobbin 6.

As shown in FIGS. 3 and 7, the claw-like projection 21 has a curved outer peripheral surface 21a, and the inner peripheral surface of the bobbin insertion hole 11 of the secondary bobbin 10 and the bobbin support base. 20
The outer peripheral surface of the circular arc surface 20a is brought into contact with the circular arc surface 20a.

In this embodiment, in FIG. 3, a plurality of communication holes 26 for filling the insulating resin are provided on the outer peripheral surface of the secondary bobbin 10 for connecting the secondary bobbin 10 and the primary bobbin 6. Through the communication hole 26, when the assembled transformer 1 is filled with the insulating resin, the bobbin insertion hole 11 is filled with the insulating resin to insulate the primary coil 2.

Next, as shown in FIG. 2, the transformer case 5 is formed in a substantially U-shape in a side view, a hook 27 for connecting to the substrate is provided at the lower end portion thereof, and the left and right peripheral portions thereof are provided. Fitting walls 28 for fitting the outer walls 12, 12 of the secondary bobbin 10 are provided. Then, the transformer case 5 is attached to 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, as shown in FIGS. 1 and 3, when the transformer case 5 is mounted on the secondary bobbin 10, the upper edge portion 28a of the fitting wall 28 is housed in the secondary bobbin 10. The primary bobbin 6 is fitted into the groove portions 29 at both ends to integrally fix the primary bobbin 6, the secondary bobbin and the transformer case 5.

In addition, as shown in FIG.
In FIG. 2, 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.
Furthermore, the upper core support 30 is provided with a mounting recess 30a for mounting the lead wire 23, and the lead wire 23 is mounted in the recess 30a.
Can be mounted and the lead wire 23 can be arranged along the transformer 1 to change the direction of the lead wire 23.

In this embodiment, 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 and the upper and lower cores are inserted. The other side portions of the core 4 are joined between the supports 31. Further, in such a state, as shown in FIG. 1, on the left and right lower core support members 31 and the upper side surfaces of the core 4,
Attach the core connector 32 that also serves as the ground in a sandwiched state,
The connecting piece 32 fixes the split core 4 into two pieces.

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. 5 and 6, the left and right windings are locked on the front surface of the pin holder 8. The projections 36, 36 for winding are provided, and the guide groove 37 for winding is provided between the projections 36, 36 over the lower surface of the primary bobbin 6,
The same protrusions 36, 36 provided on the primary bobbin 6 and the guide groove for winding
The winding a is wound by using 37 and the claw-shaped projection 21.

That is, in FIG. 8, first, one end of the winding a is connected to the primary coil pin 9 on the left side, and is engaged with the winding locking projection 36 on the left side, and passed through the winding guide groove 37. Along the left side wall 37a of the groove 37, the outer peripheral surface of the primary bobbin 6 is reached, and the winding a is wound around the outer peripheral surface of the primary bobbin 6 to the other end. Further, in FIG. 9, at the other end of the primary bobbin 6, the winding a is locked to the claw-shaped projection 21 on the left side, the winding a is turned, and it is connected to the central primary coil pin 9. When the figure
As shown in FIG. 10, the winding a is passed through the winding guide groove portion 37 and is also locked by the winding locking protrusion 36 on the right side to be connected to the central primary coil pin 9.

When connected to the central primary coil pin 9, as shown in FIG. 11, the winding a reaches the claw-shaped projection 21 on the right side of the primary bobbin 6 through the guide groove portion 37, and the winding a is attached to the projection 21.
And the winding a is wound again from the other end of the primary bobbin 6 toward the one end. Then, as shown in FIG.
The winding a is passed through the winding guide groove portion 37 again, and
It extends to one end of the bobbin 6 along the right side wall 37b of the guide groove 37 and is connected to the right side primary coil pin 9 via the right side winding locking protrusion 36.

With this structure, the winding a is locked to the left and right claw-shaped projections 21 provided on the primary bobbin 6, and the direction of the winding a wound around the bobbin is changed so that the coil a The winding a that can be connected to the primary bobbin 6 is wound on the bobbin 6 via the winding locking protrusion 36 provided on the primary bobbin 6.
Can be easily connected to each primary coil pin 9.

In the present embodiment, the winding a is connected to the three primary coil pins 9 provided on the primary bobbin 6, and each of the pins 9 is connected.
The number of turns of the winding a in the primary coil 2 is changed by selecting

The pins 9 and 16 provided on the primary bobbin 6 and the secondary bobbin 10 are formed in a quadrangular shape in cross section. The winding a is cut at the corners of the pins 9 and 16.

[0033]

As described above, according to the present invention, when the winding wire is wound around the primary bobbin, the winding wires are locked to the left and right claw-shaped projections provided on the primary bobbin and wound around the bobbin. By changing the direction of the winding, it is possible to connect with each coil pin, and further, through the winding locking protrusion provided on the primary bobbin, the winding wound around the bobbin and the primary coil pin Can be easily connected.

Further, since the outer peripheral surface of the claw-shaped projection provided on the primary bobbin is formed in a curved shape, when the primary bobbin is inserted into the bobbin insertion hole of the secondary bobbin, the claw-shaped projection is formed on the bobbin insertion hole. The primary bobbin can be easily supported by contacting the inner peripheral surface of the.

[Brief description of drawings]

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

FIG. 2 is an exploded view of the transformer.

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

FIG. 4 is a side view of the primary bobbin.

FIG. 5 is a front view of a primary bobbin around which a winding is wound.

FIG. 6 is a bottom view of the primary bobbin wound with a winding wire.

FIG. 7 is an explanatory diagram showing a stored state of the secondary bobbin in the primary bobbin.

FIG. 8 is an explanatory diagram of winding a winding on a primary bobbin.

FIG. 9 is an explanatory diagram of winding a winding on a primary bobbin.

FIG. 10 is an explanatory diagram of winding a winding on the primary bobbin.

FIG. 11 is an explanatory diagram of winding a winding on the primary bobbin.

FIG. 12 is an explanatory diagram of winding a winding on the primary bobbin.

[Explanation of symbols]

 1 transformer 2 primary coil 3 secondary coil 4 core 6 primary bobbin 8 pin holder 9 primary coil pin 10 secondary bobbin 21 claw-shaped projection 36 winding locking projection

Claims (3)

[Claims] 1. A transformer 1 in which a primary bobbin 6 having a core insertion hole 7 is housed in a bobbin insertion hole 11 provided in a secondary bobbin 10 and a core 4 is inserted into the core insertion hole 7. A plurality of primary coil pins 9 for connecting the windings a to the same bobbin 6 are projectingly provided at one end of the bobbin 6, and the other end of the same bobbin 6 is provided with left and right windings for locking the winding a. A primary bobbin for a transformer, which is provided with a claw-shaped projection 21. 2. The primary bobbin 6 of the transformer 1 described above, wherein a pin holder 8 is provided at one end of the primary bobbin 6, and a plurality of primary coil pins 9 are provided on the lower surface of the holder 8 so as to project therefrom. The primary bobbin of the transformer according to claim 1, further comprising a winding locking protrusion (36) for connecting the winding (a) to the primary coil pin (9). 3. The outer bobbin 21 of the left and right claw-shaped projections 21 provided on the primary bobbin 6 in the primary bobbin 6 of the transformer 1 described above.
The transformer according to claim 1, wherein a is formed in a curved shape, and the primary bobbin 6 can be supported on the inner peripheral surface of the bobbin insertion hole 11 of the secondary bobbin with a space therebetween. Primary bobbin.