JPH0624994Y2 - High frequency transformer - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application This invention relates to the structure of a high frequency transformer used in various electronic devices, and has a very good insulation between a ferrite core and a coil wound around a bobbin. Is.

(B) Conventional technology A high frequency transformer using a combination of E-type and I-type cores or a combination of E-type and E-type cores, which are generally made of ferrite, or a core obtained by slightly deforming these, has a hollow portion, After winding the bobbin provided with the collar to form a coil, and winding an insulating tape around the coil to insulate the coil and the ferrite core, place the middle leg of the E-type core in the hollow part of the bobbin. It was inserted and assembled.

(C) Problems to be solved by the invention However, when the insulating tape is wound around the outer circumference of the coil, it is necessary to thicken the winding layer of the insulating tape in order to ensure good insulation between the coil and the core. Therefore, there is a drawback that the structure of the high frequency transformer becomes large. Further, the winding of the insulating tape is often done by hand, resulting in poor work efficiency and high manufacturing cost.

Also, by attaching the terminal pins horizontally to the terminal plates provided at the lower end portions of both ends of the bobbin and inserting the middle leg of the E-shaped core into the hollow portion of the bobbin, the E-shaped core and the terminal pin become parallel to each other. In the structure, since the E-shaped core and the terminal pin are arranged close to each other, there is a possibility that they may come into contact with each other and cause insulation failure.

(D) Means for solving the problems The present invention improves the above-mentioned drawbacks and ensures the insulation between the coil and the ferrite core or between the coil and the ferrite core and the terminal pin, and the assembly is easy and the workability is good. The present invention provides a high-frequency transformer structure that can be manufactured at low cost, and that is small and thin.

The present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 and FIG.
FIG. 4A is a side sectional view and a front sectional view at the time of assembly.

In each of the above figures, 1 is an E-type ferrite core, 2 is its middle leg, and 3 and 3'are side legs.

Reference numeral 4 is a synthetic resin bobbin having a plurality of collars 5 provided on the outer circumference of the body, and terminal plates 7 having terminal pins 6 are provided at the lower ends of both ends. Reference numeral 8 is a hollow portion for inserting the middle leg 2 of the ferrite core 1, and 9 is a coil wound between the collars.

Reference numeral 10 denotes an insulating cover made of synthetic resin, which covers a side peripheral portion of the bobbin 4 and a frame-shaped portion 12 provided with a through window 11 at a position corresponding to the hollow portion 8 of the bobbin, and upper and lower ends of the frame-shaped portion. This is a structure in which projecting portions 13 and 13 'that project to the outer periphery and cover the upper surface and the lower surface of the ferrite core 1 are integrally formed.

With the above configuration, the through window 11 of the insulating cover 10 and the bobbin 4
The insulating cover 10 is attached to the bobbin 4 so that the hollow portion 8 of the bobbin 4 and the hollow leg 8 of the bobbin 4 are inserted into the hollow leg 8 of the E-type ferrite core 1 from both sides of the bobbin 4. When combined, the outer legs 3, 3 ′ of each E-type ferrite core and the inner surface of the yoke portion are formed by the frame-shaped portion 12 of the insulating cover 10.
Further, the outer leg of the E-type ferrite core and the upper and lower surfaces of each of the yoke portions are formed on the protruding portions 13, 1 of the insulating cover 10.
3 ', respectively, so that electrical insulation between the coil 9 and the E-type ferrite core 1 is ensured.

FIG. 4 shows an example of mounting a high frequency transformer using a bobbin in which the terminal pins 6 are horizontally implanted in the terminal plate 7. The terminal plate 7 of the transformer is such that the terminal pins 6 contact the conductive portion 15 of the circuit board 14. It is housed in a mounting hole 16 formed in the substrate.

Further, the protruding portion 13 ′ at the lower end of the insulating cover 10 has the protruding portion 1 at the upper end so that the protruding portion of the terminal pin 6 is covered.
It is formed longer than 3.

With this configuration, the height when mounted on the circuit board can be further reduced, and the ferrite core 1 and the coil 9 or the coil 9, the ferrite core 1 and the terminal pin 6 are simultaneously insulated. be able to.

(E) Operation and effect As described above, the present invention applies the insulating cover from above the bobbin around which the coil is wound, and then passes the middle leg of the E-type ferrite core through the through window of the insulating cover to form the hollow portion of the bobbin. It is possible to easily and reliably perform insulation between the coil and the ferrite core, or between the coil and the ferrite core and the terminal pins, simply by inserting and combining.

Therefore, there is no need to wind an insulating tape to insulate the coil from the ferrite core, and the assembling work is facilitated, so that there is an advantage that the work efficiency is improved and the size can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 and FIG.
Is a side sectional view and a front sectional view at the time of assembly, and FIG. 4 is an example of mounting the high frequency transformer of the present invention on a circuit board. 1 ... E-shaped core, 2 ... Middle leg 3, 3 '... Side leg, 4 ... Bobbin 5 ... Tsuba, 6 ... Terminal pin 7 ... Terminal plate, 8 ... Hollow part 9 ... Coil 10 ... Insulating cover 11 ... Through window, 12 ... Frame-shaped part 13, 13 '... Overhang part

Claims (1)

[Scope of utility model registration request] 1. A terminal plate having terminal pins planted at both ends,
A high frequency transformer comprising a bobbin formed by winding a coil between a collar provided on a hollow body and a pair of E-type ferrite cores obtained by inserting middle legs into the hollow of the bobbin and combining the bobbin with the bobbin. A frame-shaped portion that covers the side peripheral portion and is provided with a through window at a position corresponding to the hollow portion of the bobbin, and a protruding portion that extends from the upper and lower ends of the frame-shaped portion to the outer periphery and covers the upper and lower surfaces of the ferrite core. A high frequency transformer comprising an integrally formed insulating cover, wherein the insulating cover is attached to a bobbin so that the insulating cover is interposed between the ferrite core and the bobbin.