JP2971943B2 - Thin transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer mounted on an electronic device, and particularly to a structure of a thin transformer having a low mounting height on a substrate surface.

[Conventional technology]

Conventionally, this type of transformer has an insulating layer 9 for electrical insulation between windings as shown in FIG. 5, and windings of a primary winding 11 and a secondary winding 10 are separately wound. The electrical insulation layer 9 and the windings are stacked and the magnetic core 7 is combined from the upper and lower surfaces of the stack. This requires assembly man-hours for stacking, and there is a problem in safety due to misalignment during stacking. there were.

[Problems to be solved by the invention]

The present invention solves these problems by using an insulator and
By integrating the secondary winding and the secondary winding on a thin electrical insulator substrate, the step of stacking the winding and the insulating layer is eliminated, reducing the number of assembly steps and reducing the primary winding and the secondary winding. An object of the present invention is to provide a thin transformer having improved safety such as displacement of a secondary winding and an insulator and electrical insulation characteristics.

B. Configuration of the Invention [Means for Solving the Problems] The present invention is to integrate an electric insulator substrate inserted between a primary winding and a secondary winding with a primary winding and a secondary winding. A primary winding and a secondary winding are formed by folding an electric insulator substrate having a primary winding on one side and a secondary winding on the other side at a boundary between the windings. Forming a thin coil of
The ferrite core 1 is inserted into the through hole provided in the center of the thin coil.
By inserting two magnetic legs and combining a thin ferrite core disassembled from above and below, a thin transformer of the present invention is formed.

That is, according to the present invention, a spiral conductor is formed on one side of a substrate made of a thin electric insulator, in which windings adjacent to each other on the folded surface are wound in opposite directions to each other and wound around a through hole. A secondary winding made of a conductor meandering so as to alternately wind the through-hole on the opposite surface of the substrate provided with the primary winding and the primary winding is formed on both surfaces of the substrate by etching or bonding, respectively. After the surface is subjected to insulation treatment, the secondary winding is alternately folded along the folding line so as to be connected to the magnetic core and the through-hole is inserted, thereby forming a laminated body of the winding and the substrate. After connecting the laminations of the wires with a conductor so as to form a coil, the magnetic legs of the divided cores are inserted into the through holes,
A thin transformer characterized in that a winding laminated body and a magnetic core are fixed and formed by a fixing metal.

[Action]

On one substrate made of a thin sheet of electrically insulating material, spiral windings forming a primary winding are formed on one surface, and the spiral windings are mutually placed every other surface when folded later. The winding direction of the winding is spirally wound in the opposite direction. On the other hand, in the secondary winding, a through hole for inserting the magnetic leg of the magnetic core provided at the center of the folding is located at the center of each through hole for each folding surface on the opposite surface of the substrate on which the primary winding is formed. Form a zigzag meandering shape, fold along the zigzag conductor of the secondary winding, and fold it along the folding line in the left-right direction centering on the through hole of the board, and make the primary winding and electrical insulation An insulating layer is inserted between the layers of the secondary winding in the order of the substrate made of a thin plate and the secondary winding to form a folded laminate. Next, the center magnetic leg of the split magnetic core is inserted into the through hole to constitute the thin transformer of the present invention.

〔Example〕

FIG. 1 shows a completed perspective view of a thin transformer according to the present invention. FIG. 2 is a diagram in which a primary winding and a secondary winding constituting a thin transformer of the present invention are integrally formed on a thin insulating layer.
The primary winding 5 and the secondary winding 2 are formed by etching or bonding on both surfaces of the insulating substrate 1 on an electrical insulating film such as Mylar, and FIG. 2 (a) shows the secondary on the low voltage side. Winding 2
Side view, a conductor through which a current flows, and a through hole 3 for inserting a leg of a magnetic core into the laminated body after folding, and a zigzag sandwiching the through hole with a broken line indicating the boundary of the folding line 4 is provided. It has a meandering shape. FIG. 2 (b) shows a side view, and FIG. 2 (c) shows a primary winding. The primary winding is formed around a through hole and a broken line shows a boundary when folded. The next winding is formed every other section of the folding, and the winding directions of the adjacent windings are formed in opposite directions. FIG. 3 shows a diagram in which the insulating substrate 1 composed of a laminated insulating layer having primary windings and secondary windings is folded from the boundary of the fold line 4, and the alternately folded insulating substrates are shown in FIG. The conductor meandering for each through-hole in the through-hole passing through the magnetic leg of the magnetic core forming the secondary winding 2 by folding as described above, when a current flows through the conductor, a magnetic field is applied in the direction of the through-hole. It is formed so as to be vigorous. The conductor of the primary winding 5 is connected inside the through-hole and outside the insulating layer to form a winding, and a thin ferrite core is incorporated into the integrated insulating layer after folding, and the laminated body is fixed by a fixing bracket. And the magnetic core are fixed to form a thin transformer shown in FIG. The winding ratio between the primary winding and the secondary winding formed on both surfaces of the insulating layer of the present invention can be changed by changing the number of turns of the primary winding. When a plurality of secondary windings are provided, a plurality of meandering conductors to be connected to the through holes into which the legs of the magnetic core are inserted may be provided, and the conductors may be provided in a layered form insulated from each other. When changing the number, the number of times of coupling to the through-hole of the secondary winding may be set to a necessary number.

C. Effect of the Invention [Effect of the Invention] In the thin transformer according to the present invention, since the primary winding and the secondary winding are electrically insulated by an insulating layer between the windings,
There is no need for extra processing for insulation, and a folded coil with primary and secondary windings insulated can be made just by folding the insulation layer, which greatly reduces the number of assembly steps. Since the structure is such that the primary winding and the secondary winding are alternately folded, the primary winding and the secondary winding are sandwiched, and the coupling between the primary winding and the secondary winding is improved. The conductor of the primary winding on the insulating layer is connected by spot welding or cream solder etc. at the center through-hole and outside the laminate, so that multiple primary windings can be connected. The problem of the lead wire is also eliminated. As described above, according to the present invention, the primary winding side
It is possible to provide a thin transformer capable of improving the connectivity on the next winding side and setting the number of windings of a plurality of windings with a reduced number of assembling steps.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a thin transformer according to the present invention. FIG. 2 shows that a meandering conductor forming a secondary winding and a spiral conductor forming a primary winding are etched or bonded on an electric insulating layer, and then formed on an integrated insulator substrate which has been subjected to insulation treatment. 2 (a) is a plan view showing a secondary winding, FIG. 2 (b) is a side view, and FIG. 2 (c) is a plan view showing a primary winding. FIG. 3 is a perspective view showing a state in which the insulator substrate shown in FIG. 2 is alternately folded from a dashed folding line. FIG. 4 is a perspective view of a laminate in which insulator substrates are alternately folded. FIG. 5 is a perspective view showing the structure of a conventional thin transformer in which an insulating layer and a winding are stacked and arranged. DESCRIPTION OF SYMBOLS 1 ... Insulator board, 2 ... Secondary winding, 3 ... Through-hole, 4
... Folding wire, 5... Primary winding, 6... Upper and lower connecting parts of primary winding, 7... Magnetic core, 8. 11 ... primary winding, 20 ... winding laminate.

Claims (1)

(57) [Claims] 1. A spiral conductor which is wound on one side of a substrate made of a thin electrical insulator, and has windings adjacent to every other one of the folded surfaces in opposite directions and wound around a through hole.
A secondary winding made of a conductor meandering so as to alternately wind the through-hole on the opposite surface of the substrate on which the primary winding is provided and formed on the both surfaces of the substrate by etching or bonding, respectively. After insulation treatment is performed on the surface, the secondary winding is alternately folded along the folding line so as to be connected to the magnetic core and the through-hole is inserted to form a laminate of the winding and the substrate, and the primary winding is formed. Characterized in that the laminations are connected by a conductor so as to form a coil, then the magnetic legs of the divided magnetic cores are inserted into the through holes, and the winding laminated body and the magnetic core are fixed and formed by fixing brackets. Trance.