JPH06204051A - Thin transformer - Google Patents

Abstract

PURPOSE:To achieve a thin transformer made in smaller-size and more lightweight and having an increased required voltage, by placing mounting terminals in the end of a thin base and in a position near the center of the thin base in the vicinity of the central through-hole of the thin base, and mounting a thin spiral coil is mounted on the mounting terminals so that the thin coil is interposed between both magnetic side legs of a magnetic core. CONSTITUTION:One of the mounting terminals 10 provided in the end of a thin base 1 is placed in a position nearer to a central through-hole 7 of the base as a central mounting terminal 101, and the portion connecting a surface mount terminal 41 to the mounting terminal 101 is buried in the base 1. On the other hand, a thin coil 5 is formed by punching out a copper plate into a spiral shape, and one end of the thin coil 5 is mounted on the mounting terminal 10 in the end of the base 1, while the other end of the thin coil 5 is mounted on the mounting terminal 101 near the central through-hole 7. The central leg of a mounted magnetic core 3 enters the central through-hole 7 of the thin coil 5, and the thin coil 5 is interposed between both magnetic side legs of the magnetic core 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin transformer incorporated in an electronic device, and more particularly to a structure for mounting a spiral thin coil on a thin base.

[0002]

2. Description of the Related Art Conventionally, this type of thin transformer is completed by assembling a thin base 2, a thin coil 6, and an E-type magnetic core (not shown) as shown in FIG. The thin base 2 is provided with a surface mounting terminal 4 at an end thereof, and a copper plate mounting terminal 10 is provided on an upper surface of the thin base 2. The surface mounting terminal 4 and the copper plate mounting terminal 10 are one body. The two E-shaped magnetic cores are attached to the central through hole 7 and the magnetic legs on both sides in the grooves 9 of the core guide 8 from above and below so as to sandwich the thin base. A predetermined number of thin coils 6 have mounting holes 11 and are mounted on the mounting terminals 10. For thin transformers, if the number of turns of the coil is two or more, a polyurethane copper wire with a fusion layer is wound in a flat spiral shape and the polyurethane copper wire is fused, and the winding starts from near the center of this winding coil. The first polyurethane copper wire was pulled out and entangled with the mounting terminals provided at the end of the thin base. For a thin coil with one winding and a large amount of current flowing through it, a thin copper plate is punched out, and a U-shaped tip mounting hole 11 is attached to the mounting terminal 10 to form a coil without winding. Was incorporated.

[0003]

Even if U-shaped thin coils are laminated, the thin coils are fused at a voltage of about 5V at the most, so that the working voltage cannot be increased and the working voltage is 10 to 25V. Could not meet the request. Further, as a recent demand for smaller size and lighter weight, thinner transformers and coils are required, so that it is necessary to improve the working voltage to 10 to 25 V and further reduce the size and weight. Therefore, it is more compact and lightweight, and the operating voltage is 10-25.
The purpose is to provide a thin transformer that has been upgraded to V.

[0004]

Since the present invention incorporates a thin coil having two or more turns, one of the mounting terminals attached to the end of the thin base is placed at a position near the center through hole of the base. The surface mounting terminals and the connecting terminals are embedded in the base. On the other hand, a thin coil is formed by spirally punching a copper plate with an arbitrary number of turns.One end of the thin coil is the conventional mounting terminal at the end of the base, and the other end of the thin coil is closer to the central through hole. To the mounting terminal of the present invention. That is, the present invention is a thin base and thin coil of a thin transformer in which an insulator is inserted between layers and a magnetic leg of a magnetic core made of a soft magnetic material is inserted into a central through hole to be assembled. A mounting terminal integrated with one or more surface-mount terminals is installed near the tip of the base and near the center near the center through hole of the thin base, and a thin coil consisting of a spiral conductor is attached to the mounting terminal. Then
A thin transformer characterized in that a middle leg of a magnetic core mounted in a central through hole at the center of the thin coil is inserted, and both magnetic legs of the magnetic core sandwich a spiral thin coil. is there.

[0005]

In the present invention, it is possible to wind a large number of times without deteriorating the insulating property. In FIG. 3, an example in which the thin coil 5 is wound three times is shown. However, in practice, the number of windings can be increased to five and ten, if necessary. When the number of windings of the transformer increases, the voltage used by the transformer is proportional to the number of windings. Therefore, when the number of windings increases, the voltage used improves. Also, since the end of the thin coil is connected to each mounting terminal and surface mounting terminal of the thin base as a mounting hole, one end of the thin coil is in a position where it is easy to connect with the mounting terminal, but one side should be away from the mounting terminal. , Closer to the central through hole. Therefore, it is necessary to move the position of the mounting terminal to the copper plate to the position of the mounting hole near the center of the thin coil. Therefore, the surface mount terminal and the mounting terminal are
Since it is a single body, the distance between the surface mount terminal and the mounting terminal is long, but the insulation is sufficient between the surface mount terminal and the mounting terminal due to the structure embedded in the insulating base.

[0006]

1 is a perspective view of a thin base according to the present invention. FIG. 2 is a perspective view showing the configuration of the thin transformer of the present invention. FIG. 3 is a plan view of a three-turn thin coil according to the present invention. FIG. 4 is a side view of the transformer of the present invention after assembly.

The thin base of the present invention has a structure as shown in FIG. 1 and is made of a rectangular flat insulating material. The middle leg of the magnetic core, which is assembled to the middle leg insulating collar 12 of the thin base 1, is inserted. Middle foot insulating tsuba 12
A central through-hole 7 is provided in the center of the central through-hole 7, and a middle core insulating collar 12 surrounded by a thin plate is provided around the central through-hole 7 to insulate the magnetic core from the thin coil. Moreover, a plate-shaped magnetic core insulating collar 13 that insulates the magnetic core and the thin coil is provided on the end surface to which the outer magnetic core of the thin base to which the thin coil is attached is assembled. Thin base 1
A groove 9 of the core guide 8 is provided in the central portion from the both side surfaces to the bottom surface of the magnetic core so as to fit the both side legs of the magnetic core. Provided are a surface-mounting terminal 4 which is formed by sealing using a hoop material at a tip portion perpendicular to the long axis direction of the thin base, and a mounting terminal 10 which is directly connected to the surface-mounting terminal 4 and protrudes from the upper surface of the thin base. Further, the surface mount terminal 41 of the present invention
And the mounting terminal 101 which is connected and integrated with the surface mounting terminal 41.
And are provided separately. Surface mount terminal 41 and mounting terminal 101
And a plurality are provided as needed. The thin base has a longitudinal direction of 40 mm, a width direction of 30 mm, and a height of 10 mm. The magnetic core insulating flange 13 has a height of 5 mm and a middle foot insulating flange 1
The height of 2 is 5 mm. In the present invention, the size is not limited to this.

FIG. 2 is an exploded perspective view of the thin transformer of the present invention. The thin transformer of the present invention includes surface mount terminals 4, 41.
And a thin base 1 having mounting terminals 10 and 101 and 2
The E-shaped magnetic core 3 and the thin coil 5 having two turns in the drawing having the mounting holes 11 are provided.

FIG. 3 shows a thin coil 5 of the present invention. Here, a coil having 3 turns is used, but a coil having 5 to 10 turns may be used, and a thin coil having 3 turns of 0.15 mm is used.
A copper plate having a thickness of 5 mm and laminated with an insulating layer of tape, and the thin coil 5 has a length of about 25 to 30 mm,
The width of the thin coil is 20 mm, and the thin coil has a hollow center so as to surround the central through hole and forms a rectangular spiral shape. At both ends, mounting holes 1 to be mounted on the mounting terminals 10 and 101 are formed.
It has 1. Until now, if the thin coil of three turns shown in the figure is not used, three thin coils must be used, but the thin coil of the present invention requires only one thin coil, which helps to reduce the size and weight. . Also, since one thin coil is equivalent to 3 turns, the number of turns increases by using 2 coils and 3 coils, and the operating voltage is remarkably increased.

FIG. 4 shows a thin base 1, a magnetic core 3, and
Thin coil 5, core guide 8, surface mount terminals 4, 41
FIG. 2 is a front view of a completed thin transformer including the mounting terminals 10 and 101, and shows a thin transformer with good insulation, capable of passing a high current, and having a working voltage of 10 to 25V.

[0011]

When it is used as a transformer, the output voltage of about 5V can be set to a value of 2 to 5 times with the conventional number of turns of 1 and the current which can be simultaneously passed can be secured at a considerably large value. New specifications that did not exist are born. Further, the requirements for the inductance value required for the choke coil are further expanded, and the types of specifications are increased.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing the configuration of a thin transformer according to the present invention.

FIG. 3 is a plan view of a flat coil having a plurality of turns (three turns) according to the present invention.

FIG. 4 is a side view of the thin transformer of the present invention after assembly.

FIG. 5 is a perspective view of a conventional thin base and a flat thin coil.

[Explanation of symbols]

 1 Thin Base of the Present Invention 2 Conventional Thin Base 3 Magnetic Core 4 Surface Mount Terminal 41 Surface Mount Terminal of the Present Invention 5 Thin Coil of the Present Invention 6 Conventional Thin Coil 7 Central Through Hole 8 Core Guide 9 Groove 10 Conventional Mounting terminal 101 Mounting terminal of the present invention 11 Mounting hole 12 Middle foot insulating collar 13 Magnetic core insulating collar

Claims (1)

[Claims] 1. A thin base and thin coil of a thin transformer, wherein an insulator is inserted between layers, and a magnetic leg of a magnetic core made of a soft magnetic material is inserted into a central through hole to be assembled.
A mounting terminal integrated with one or more surface-mounting terminals is installed at the tip of the thin base and near the center near the central through hole of the thin base, and a thin coil made of a spiral conductor is used as the mounting terminal. The thin leg is characterized in that the middle leg of the magnetic core is inserted into the central through hole at the center of the thin coil, and the magnetic legs on both sides of the magnetic core sandwich the spiral thin coil. Shaped transformer.