JPH0745938Y2 - Transformer cover - Google Patents

Description

[Detailed description of the device]

[0001]

The present invention relates to a transformer (including a choke coil and a noise filter) in which a magnetic core (hereinafter also referred to as a core) made of a magnetic material is mounted on a coil bobbin provided with a winding. More specifically, the present invention relates to a transformer cover for covering a coil bobbin, in which the heat radiation efficiency of the winding portion of the coil bobbin is improved and the directionality of the transformer (for example, the primary side and the secondary side) is made clear.

[0002]

2. Description of the Related Art Generally, a transformer (generally including a choke coil, a noise filter, etc.) that exhibits a circuit function by transmitting electromagnetic energy is covered with a cover for the purpose of insulating and protecting the circuit function from the external environment. I cover it and use it.

This will be described with reference to the drawings. In FIG. 6, a coil bobbin 20 made of synthetic resin or the like is used.
The winding winding column 30 having a substantially prismatic shape, around which a winding is wound, is arranged in the central portion, and the winding stopping column having a winding stopping action is provided at both ends of the winding winding column 30. The frames 21 and 22 are arranged so as to sandwich the winding winding column 30.

In particular, a magnetic core fitting hole 33 for fitting a central magnetic leg of a set of E-shaped cores, which will be described later, is formed in series at the center of the winding winding column 30. Also, the winding winding column 3
Winding frames 27, 28, and 29 for winding the winding wire on the primary side and the secondary side are arranged on the outer circumference of 0, respectively.

From both ends of the winding winding column 30,
Magnetic core mounting bases 23 and 24 for mounting the respective yoke portions of a pair of E-shaped cores, which will be described later, are extended substantially horizontally. Further, pin terminals 25 and 26 provided for electrical connection with an external electronic circuit and mounting of the transformer body are provided on the outer end surfaces of the magnetic core mounting base materials 23 and 24. The pin terminals 25, 26 are generally formed by forming copper or the like into a pin shape and plating the surface with tin or the like.

On the other hand, in the winding winding column 30, a winding 31 such as an enamel-coated conductor wire in which a fine wire made of a good conductor such as copper is baked with enamel, which is a heating and drying system varnish, exhibits a function as a transformer. The primary winding (P) and the secondary winding (S) are separately wound to form a winding portion 32. The winding start portion, the winding end portion, and the intermediate lead-out portion of each of the primary side (P) and the secondary side (S) are tangled to the pin terminals 25 and 26, respectively.

In the coil bobbin 20 thus constructed, the E-shaped cores 37 and 38 made of a magnetic material such as ferrite are fitted into the magnetic core fitting hole 33 from both sides. The E-shaped cores 37 and 38 are each composed of a central magnetic leg, a pair of side magnetic legs arranged to face each other so as to sandwich the central magnetic leg, and one end of the central magnetic leg and a pair of side magnetic legs. A yoke portion that connects one ends of the two to each other. Further, the coil bobbin 20 is covered with the transformer cover 10 made of synthetic resin or the like from above, and thus the transformer 35 is configured. The transformer cover 10 has a side wall portion 15 that forms a bottomless box shape and a flat surface portion 13 that closes the upper side of the side wall portion 15, and has a storage recess for storing the coil bobbin 20 therein. Has been formed.

[0008]

However, according to the above-mentioned conventional transformer, the primary side and the secondary side in the winding part of the coil bobbin transmit and receive electromagnetic energy by interposing the magnetic cores to develop the transformer function. However, since the winding part, which is the site where this function is expressed, is closed by the transformer cover, the amount of heat loss related to transmission and reception of electromagnetic energy generated when the transformer function is expressed is inside the transformer cover. However, there was a problem that the transformer function was adversely affected.

Further, in the transformer cover, in the case where the winding portion is wound around the primary side and the secondary side to form the transformer in which the terminal portions on each side are provided with the directional polarity, the directional polarity is provided by the transformer cover. Visual recognition becomes difficult, and there is a risk that the mounting direction may be confused when mounting this transformer on an electronic circuit board.

[0010]

In order to achieve the above object, the present invention provides a transformer cover which is mounted on the coil bobbin of a transformer in which a magnetic core is mounted on a wound coil bobbin and which covers the coil bobbin. And asymmetric heat dissipation holes are provided on both sides of a flat surface portion that covers the upper surface side of the coil bobbin, and the heat dissipation holes are provided on both ends of the winding portion of the coil bobbin. is there.

[0011]

According to the present invention, the amount of heat loss generated due to the function development of the transformer is radiated through the heat radiation hole of the transformer cover. Therefore, it is possible to improve the heat dissipation efficiency of the amount of heat loss remaining in the winding portion of the transformer.

In particular, by checking the shapes of the heat radiation holes, it is possible to easily confirm the directionality of the primary side and the secondary side of the transformer.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a transformer cover 50 of the present invention. The transformer cover 50 is formed by a plate-shaped member 65 made of, for example, synthetic resin, and has a convex portion 59.
And collar portions 61 to 64.

The convex portion 59 has a substantially quadrangular shape and has a flat surface portion 53 on the upper surface thereof and the flat surface portion 53.
Side walls 55 to 58 are provided upright on all sides so as to support as a ceiling surface. Particularly, rectangular heat dissipation holes 51 and 52 are opened on both sides of the flat surface portion 53, and are opposed to each other.
The magnetic core fitting insertion hole 6 is provided at the approximate center of the base end of each of the side walls 55 and 56.
7, 68 are formed.

The convex portion 59 is formed by extruding in an embossed shape from the approximate center of the plate-shaped member 65, and the remaining portions are the above-mentioned collar portions 55 to 58.
Therefore, there is a recess in the substantially central portion of the member 65 that is extruded when forming the convex portion 59, and this is the winding portion fitting hole 60. That is, the winding fitting hole 60 is opened along the inner surface of the side wall portions 55 to 58 on the base end side.

FIG. 2 is a plan view of the transformer cover 50. As is clear from this figure, in the heat radiation holes 51 and 52 provided in the flat surface portion 53 of the convex portion 59, one heat radiation hole 51 is formed wider than the other heat radiation hole 52, and both of them are formed. It is asymmetric. Therefore, according to the transformer cover 50, it is possible to easily visually confirm the directionality of the primary side (P) and the secondary side (S) of the transformer, which will be described later. By providing the wide heat dissipation hole 51 on the primary side (P) having the current value, the heat dissipation efficiency of the amount of heat loss generated by the current can be further improved.

Next, the transformer cover 50 is shown in FIGS.
A transformer 85 using is shown. In the figure, 70 is a coil bobbin. The coil bobbin 70 is made of synthetic resin or the like, and includes a winding winding column 80 having a substantially prismatic shape, and winding stop frames 71 and 72 located at both ends of the winding winding column 80.

A magnetic core insertion hole 83 for inserting a central magnetic leg of a set of magnetic cores, which will be described later, is communicated with the center of the winding winding column 80, and the winding is provided on the outer periphery. Winding frames 77 to 79 for winding 81 on the primary side and the secondary side, respectively, are provided.

From both base ends of the winding winding column 80,
The collar mounting bases 73 and 74 are extended substantially horizontally so that the collar portions 61 and 62 of the transformer cover 50 are mounted. In particular, on the end faces of the collar mounting bases 73 and 74,
Pin terminals 75 and 76 provided for electrical connection with an external electronic circuit and mounting of the transformer body are extended. In addition,
The pin terminals 75 and 76 are formed by forming copper or the like into a pin shape and plating the surface with tin or the like.

By the way, at each portion of the winding winding column 80 divided by the winding frames 77 to 79, a thin wire made of a good conductor such as copper is wound with an enamel-coated conductor wire made by baking enamel which is a heat-drying varnish. The wire 81 is provided, and in particular, in order to exert a function as a transformer, the wire is divided into a primary side (P) and a secondary side (S), and a winding portion 82 is formed.

The first winding portion, the last winding portion, the intermediate withdrawing portion, and the like of each of the primary side (P) and the secondary side (S) are provided with the respective collar mounting bases 7.
The pin terminals 75 and 76 are respectively entangled through the pins 3 and 74.

In the coil bobbin 70 having the above-described structure, the winding portion 82 has the protrusion 5 of the transformer cover 50.
9 is mounted from the upper side through the winding portion crowning hole 60, and in this state, the heat radiation holes 51 and 52 formed in the flat surface portion 53 of the convex portion 59 open above both ends of the coil bobbin 70, and The magnetic core fitting holes 67, 68 are aligned with the magnetic core fitting hole 83 of the coil bobbin 70, and the central magnetic legs of the E-shaped cores 87, 88 as magnetic cores are fitted into the magnetic core fitting hole 83. At this time, the side magnetic legs of the E-shaped cores 87 and 88 are mounted on the collar portions 63 and 64 of the transformer cover 50, and the yoke portions are mounted on the collar portions 61 and 62, respectively. Then, the transformer cover 50 and the E-shaped cores 87 and 88 are fixed by a fixture (not shown), and E on the primary side (P) and the secondary side (S).
A transformer 85 is configured to exhibit a transformer function by transmitting and receiving electromagnetic energy via the mold cores 87 and 88.

The E-shaped cores 87 and 88 are made of a magnetic material such as ferrite, and include the above-mentioned central magnetic leg and the pair of side magnetic legs arranged to face each other so as to sandwich the central magnetic leg. It has one end of the central magnetic leg and the yoke portion connecting one end of each of the pair of side magnetic legs to each other.

According to the transformer 85, the winding portion 82 of the coil bobbin 70 is provided with the convex portion 59 of the transformer cover 50, and the collar portions 61 to 64 are provided with the E-shaped cores 87 and 88. Winding section 82 and E
The mold cores 87, 88 can be electrically insulated from each other, and the deterioration of the transformer function due to an electrical short circuit can be prevented.

Next, another embodiment of the present invention will be described with reference to FIG. The same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, in the transformer cover 120 of this embodiment, a heat dissipation hole 121 is formed at the end of the convex portion 59 on the primary side (P) of the plane portion 123, and
A heat dissipation hole 122 is opened at an approximately end of the secondary side (S),
In particular, one heat dissipation hole 121 is formed longer than the other heat dissipation hole 122. Then, also in this embodiment, the same effect as that of the previous embodiment can be obtained.

Although the embodiment of the present invention has been described above, the shape of the heat dissipation hole is not limited to the rectangular shape, and may be, for example, a substantially elliptic shape, and can be changed as necessary.

Although the magnetic core has been described as a set of E-shaped cores, the magnetic core is not limited to this and may be a combination of E-shaped and I-shaped cores.

[0029]

According to the transformer cover of the present invention, asymmetrical heat dissipation holes are provided on both sides of the flat surface that covers the upper surface of the coil bobbin, and the heat dissipation holes are provided on both ends of the winding part of the coil bobbin. Since it is opened, the amount of heat loss generated by the function expression of the transformer can be radiated through the heat radiation hole. Therefore, the loss of the amount of heat has no adverse effect on the transformer function, and an excellent effect that a highly reliable transformer can be provided is obtained.

Further, in particular, since the heat radiation holes are asymmetric, it is possible to easily confirm the directionality such as the primary side and the secondary side of the transformer by the heat radiation holes. Therefore, when the transformer is mounted on an electronic circuit board or the like, it is possible to prevent mounting in the wrong direction, and further, it is possible to improve the reliability of an electronic device or the like in which the transformer is built. .

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer cover showing an embodiment of the present invention.

FIG. 2 is a plan view of the transformer cover.

FIG. 3 is a side view showing a state in which a part of the transformer provided with the transformer cover is cut away.

FIG. 4 is a perspective view showing a transformer provided with the transformer cover.

FIG. 5 is a plan view of a transformer cover showing another embodiment of the present invention.

FIG. 6 is a side view showing a state in which a part of a transformer provided with a conventional transformer cover is cut away.

[Explanation of symbols]

 50 Transformer Cover 51, 52 Heat Dissipation Hole 53 Flat Part 59 Convex Part 60 Winding Part Crowning Hole 65 Plate Member 70 Coil Bobbin 71, 72 Winding Stop Frame 73, 74 Collar Mounting Base Material 80 Winding Winding Column 81 Winding 82 Winding part 85 Transformer 87,88 E type core P Primary side S Secondary side

Claims (1)

[Scope of utility model registration request] 1. A transformer cover, which is mounted on the coil bobbin and covers the coil bobbin in a transformer in which a magnetic core is mounted on a coil bobbin provided with windings, on both sides of a flat surface portion that covers the upper surface side of the coil bobbin. A transformer cover, characterized in that asymmetric heat dissipation holes are provided, and the heat dissipation holes are opened on both ends of the winding portion of the coil bobbin.