JP3008243U - High frequency transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] In a small high frequency transformer in which a secondary coil is coaxially mounted on the outer circumference of the primary coil, a short circuit between the high potential side lead wire of the secondary coil and the winding body Prevent accidents. [Structure] In a high frequency transformer in which a secondary coil L2 is coaxially mounted on the outer circumference of a primary coil L1, a flexible bending piece 4 is formed integrally with a collar 3 of a bobbin 2 for the secondary coil, and the bending is performed. The free end of one piece is housed and fitted in the recessed fitting portion 6 provided in the other collar, and the high potential side lead wire L2a of the secondary coil is inserted into the cut groove or the through hole 5 and the upper surface of the bent piece. The lead wire on the high potential side of the secondary coil was prevented from coming into direct contact with the winding body portion by being led out to and connected to the terminal pin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small high frequency transformer.

[0002]

[Prior art and its problems]

 In general, high-frequency transformers tend to be downsized as electronic devices are downsized or the frequencies are increased. When downsizing a high-frequency transformer, not only should the insulation between the primary coil and the secondary coil be ensured, but also the insulation performance between the high potential side lead wire of the secondary coil and the winding body part Need to consider. That is, in a small-sized high-voltage high-frequency transformer, since the diameter of the electric wire used is small and the number of windings is large, there is a short-circuit accident between the high-potential-side lead wire of the secondary coil and the winding body. Was easy to cause. For this reason, conventionally, by winding an insulating tape around the winding body of the secondary coil or by covering the high potential side lead wire with an insulating tube, the high potential side lead wire and the winding body portion directly contact with each other. I was trying not to. However, such a structure in which the insulating tape is wound or the insulating tube is covered has a drawback that the manufacturing process is complicated, the workability is poor, and the cost is high.

[0003]

[Means to solve the problem]

 In order to solve the above conventional problems, the present invention forms a flexible bending piece integrally with a secondary coil bobbin in a high frequency transformer in which a primary coil and a secondary coil are coaxially mounted. By fitting the free end of the bending piece into the recessed fitting portion provided on the other collar, and guiding the high-voltage side lead wire of the secondary coil to the terminal pin through the upper surface of the bending piece, the secondary coil. It is intended to prevent the high-potential-side lead wire from directly contacting the winding body, simplify the manufacturing process, and provide a high-frequency transformer with a reduced external dimension.

[0004]

【Example】

 Embodiments of the present invention will be described below. FIG. 1 is a completed assembly view of a high frequency transformer of the present invention, FIG. 2 is an exploded perspective view for explaining the assembly process, and FIG. 3 is a top view of a secondary coil bobbin. In the figure, 1 is a bobbin for a primary coil in which a primary coil L1 is wound, and a drum-shaped ferrite core is used in this embodiment. 2 is a bobbin for the secondary coil around which the secondary coil L2 is wound, 3 is a flange provided on the outer circumference of the body of the bobbin for the secondary coil, and 4 is a bending piece integrally formed with the uppermost flange, which is flexible. In the vicinity of the bent portion, a kerf or through hole 5 for leading the high potential side lead wire L2a to the upper surface of the bent piece 4 is provided. A recessed fitting portion 6 having substantially the same width as that of the bent piece is formed at a position of the other flange corresponding to the bent piece, and the bent piece is provided at a position facing the recessed fitting portion in the width direction. A protrusion 7 is formed to prevent the free end of 4 from coming off. Reference numeral 8 is a guide ridge formed on both sides of the upper surface of the bending piece 4, and forms a guide groove for preventing the high potential side lead line L2a from falling off the upper surface of the bending piece 4. Reference numeral 9 is a base in which a plurality of terminal pins 10 are planted. Next, the assembly process of the above configuration will be described. First, the primary coil bobbin 1 around which the primary coil L1 is wound is fixed to the center of the base 9, and the terminals L1a and L1b of the primary coil L1 are connected to predetermined terminal pins. Next, the high-potential-side lead wire L2a of the secondary coil L2 wound around the secondary coil bobbin 2 is inserted into the cut groove or the through hole 5 and led out to the upper surface of the bending piece 4, and the guide ridge 8 After passing through the gap, the free end of the bending piece 4 is fitted and locked to the recessed fitting portion 6 of the collar 3 by utilizing its elasticity. Next, the bobbin 2 for the secondary coil is coaxially attached to the outer circumference of the bobbin 1 for the primary coil, and is fixed to the base 9 to fix the terminal L2a of the lead wire on the high potential side of the secondary coil L2 and the lead wire on the low potential side. Each of the terminals L2b of the above is connected to a predetermined terminal pin 10.

[0005]

As described above, according to the present invention, in the high frequency transformer in which the primary coil and the secondary coil are coaxially mounted, the bending piece is formed integrally with the flange of the bobbin for the secondary coil, and the bending piece is free. After the end is housed and fitted in the recessed fitting part provided on another flange, the lead wire on the high potential side of the secondary coil is inserted into the cut groove or through hole and led out to the upper surface of the bent piece. Since it is connected to a predetermined terminal pin, the lead wire on the high potential side of the secondary coil and its intermediate winding can be insulated with a simple structure.

[0006]

【effect】

 Therefore, it is possible to easily and reliably insulate the high potential side lead wire of the secondary coil and the intermediate winding thereof without using an insulating tape or an insulating tube, which simplifies the manufacturing process. Since the free end of the bent piece fits into the recessed fitting part provided on the other flange and is locked, it does not project from the outer circumference of the bobbin for the secondary coil, and the external dimensions can be reduced. is there.

[Brief description of drawings]

1 is a completed assembly view of a high frequency transformer of the present invention, FIG. 2 is an exploded perspective view for explaining the assembly process, and FIG. 3 is a top view of a secondary coil bobbin.

[Explanation of symbols]

1 ... Primary coil bobbin, 2 ... Secondary coil bobbin, 3 ... Tsuba 4 ... Bending piece, 5 ... Cut groove or through hole, 6 ...
Recessed fitting part, 7 ... Protrusion, 8 ... Guide ridge,
9 ... Base, 10 ... Terminal pin

Claims (2)

[Scope of utility model registration request] 1. A base having terminal pins, a primary coil fixed to the upper surface of the base, and a secondary coil coaxially mounted on the outer periphery of the primary coil. In a high-frequency transformer in which each terminal of the next coil is connected to a terminal pin, it has flexibility integrally with one of the collars of the bobbin for the secondary coil, and a cut groove or a through hole is formed near the bent portion. A bending piece is provided, and the free end of the bending piece is fitted and locked in a recessed fitting portion formed corresponding to another brim, and the high potential side lead wire of the secondary coil is inserted into the cut groove or the through hole. A high-frequency transformer characterized by being inserted and led out to the upper surface of the bent piece and connected to a terminal pin. 2. The guide strips are provided on both sides of the upper surface of the bending piece in the longitudinal direction so that the lead wire on the high potential side of the secondary coil does not drop off from the upper surface of the bending piece. High frequency transformer described in.