JPH05101941A - Bobbin for switching regulator transformer - Google Patents

Abstract

PURPOSE:To prevent temperature from being raised by effectually achieving internal heat radiation of a transformer coil winding. CONSTITUTION:Coil winding 10-12 are prevented from temperature rising at 3-8 deg.C by providing many holes in flanges 2, 3 located at opposite ends of a cylindrical winding core body of a bobbin 1 for a switching regulator transformer. There is realized a high performance miniature bobbin with improved reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin used for a transformer of a power supply using a switching regulator, and more specifically, it forms a wind hole in a flange of the bobbin to enhance a heat radiation effect and suppress a temperature rise of a coil winding. By
The present invention relates to a bobbin having an improved power supply capacity.

[0002]

2. Description of the Related Art As is well known, in a resonance type switching power supply transformer, a primary winding and a secondary winding are wound around a magnetic core forming a common magnetic circuit to prevent an electromagnetic induction phenomenon between them. It is used to perform a transformer action. In recent years, with the miniaturization and weight reduction of various electronic devices, a highly efficient switching power supply has rapidly progressed as a power supply device, and the frequency thereof has been increased, so that the power supply transformer has been remarkably downsized.

As for the high speed switching power supply,
In many cases, an EI type ferrite core, an EE type ferrite core, or the like is used as the magnetic core, and a coil winding is applied to the central leg portion thereof. In general, each of the primary and secondary windings is wound on a bobbin made of synthetic resin and having flanges formed on both ends, and is inserted into the leg portion of the ferrite core.

[0004]

However, in the conventional transformer in which the coil winding is wound around the bobbin, as the number of turns increases, the heat inside does not easily radiate to the outside, and the temperature of the winding rises. This is because the surface of the outer winding is in contact with air, so it is easy to dissipate the heat, but the inner winding is surrounded by a bobbin made of synthetic resin, which has poor thermal conductivity, so the heat is not transferred to the outside. There is no choice but to transmit it to the winding of the coil and dissipate heat, and as a result, the internal temperature rises. Moreover, again
Since the outer winding has to radiate both self-generated heat and heat from the inner side, the winding temperature becomes high.

Therefore, when the upper limit of the temperature is regulated from the reliability of the power transformer, the limit value of the power supply of the transformer must be lowered, and as a result, a one-size larger transformer is used or a load is increased. There is a problem that the load power must be suppressed by lowering the performance on the side.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a bobbin for a switching regulator transformer which can secure a sufficient heat dissipation of the coil winding and occupies a small area. To do.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a transformer bobbin having an excellent heat dissipation effect, and a bobbin main body having a tubular winding core and a flange having a waterside plate at both ends. A bobbin for a switching regulator transformer in which a wind hole is provided in the flange.

[0008]

In the above structure, the coil winding wound around the tubular core of the bobbin body not only comes into contact with air on the outside, but also has air holes formed in the flanges formed at both ends of the bobbin body. The side surfaces of the coil windings piled up by will also come into contact with air. Therefore, the heat generated from the inner winding is also radiated from this air hole, the temperature rise inside the coil winding is effectively suppressed, and the transformer can be miniaturized by improving the heat radiation effect. ..

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Needless to say, the embodiments are merely examples, and various modifications and improvements can be made without departing from the spirit of the present invention. In addition, corresponding portions in FIGS. 1 to 3 are denoted by the same reference numerals.

FIG. 1 shows an embodiment of a bobbin for an FZ power source PRT among bobbins for a switching regulator transformer according to the present invention. A coil bobbin 1 has flanges 2 and 3 at both ends, A core 20 composed of a winding wire 10, a primary winding wire 11 and a secondary winding wire 12, and intermediate flanges 4 and 5 interposed between them. The core 20 is made of an EE-type or EI-type ferrite magnetic core. , And prepare the coil base 6 with the pin terminals 7 embedded.
The stove bobbin 1 incorporating the above-mentioned magnetic core 20 is adhesively attached with a resin, and the winding ends of the secondary winding 12 are entangled with pin terminals and soldered to complete a transformer coil. A large number of air holes 8 are formed in the flanges 2 and 3 of the bobbin 1 which are horizontal plate portions, and the middle flanges 4 and 5.
Has been drilled.

FIG. 2 shows a bobbin for a Z power source PIT which is another embodiment of the present invention. The coil bobbin 1 has flanges 2 and 3 at both ends thereof, and has a primary winding 11 and a secondary winding. A coil bobbin in which the wire 12 is mounted and the intermediate collar 4 is interposed between them, the core 20 is mounted on the wire 12, and the coil base 6 in which the pin terminals 7 are embedded is prepared, and the core 20 is incorporated. 1 is attached by resin,
After that, the transformer coil has a completed structure similar to the FZ power source PRT. Then, in the same manner as described above, a large number of air holes 8 are formed in the flanges 2 and 3 of the bobbin 1 and the middle collar 4.
Has been drilled.

FIG. 3 shows a bobbin for a general switching regulator transformer according to still another embodiment of the present invention, which has flanges 2 and 3 at both ends of a coil bobbin 1 and comprises a tubular winding core. The coil winding 13 is wound around the body of the bobbin, the core 20 is mounted on the coil winding 13, and the coil base 6 in which the pin terminals 7 are embedded is prepared.
The coil bobbin 1 incorporating the above-mentioned core 20 is adhesively attached with a resin, and thereafter, a transformer coil is completed in the same manner as described above. And as before,
A large number of air holes 8 are formed in the flanges 2 and 3 of the bobbin 1.

[0013]

As described above, according to the present invention, a large number of air holes are formed in the flange of the coil winding bobbin to efficiently dissipate the heat inside the coil winding of the transformer. Therefore, the temperature of the coil winding is lowered by 3 to 8 ° C. as compared with the conventional coil. As a result, the operating cost can be reduced by suppressing the temperature rise, the reliability can be reduced, the weight and space can be reduced, and the bobbin for the switching regulator transformer that is smaller than the conventional transformer can be provided. Is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a structure of a bobbin for an FZ power source PRT according to the present invention.

FIG. 2 is an explanatory view showing a structure of a Z power source PIT bobbin according to the present invention.

FIG. 3 is an explanatory view showing the structure of a bobbin for a general switching regulator transformer according to the present invention.

[Explanation of symbols]

 1 bobbin 2 flange 3 flange 8 wind hole

Claims (1)

[Claims] 1. A bobbin for a switching regulator transformer having a bobbin main body made of a tubular winding core, and flanges made of horizontal plate portions formed at both ends of the bobbin main body. Bobbin.