JPH0336707A - Printed-circuit board mounting type coil - Google Patents

Abstract

PURPOSE:To prevent a coil winding from being present between a core and a printed-circuit board by using the printed-circuit board as part of coil winding of a printed-circuit board mounting type transformer or an inductor and then attaching a core to the printed-circuit board with other part of the coil winding. CONSTITUTION:A primary coil winding of a transformer is soldered so that a core is fixed from an inside a of the core 3 to an outside (b) with a wire C after passing through a printed conductor 1 of a terminal 6. Similarly, wiring is made from (b) to a terminal 4 for surrounding the core through a printed conductor (d). A secondary winding is wired to a terminal 5 for surrounding the core as in the primary winding from the printed conductor of a terminal 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for configuring the windings of a coil such as a printed circuit board-mounted transformer or inductor.

[Conventional technology]

5 and 6 show a conventional hybrid integrated circuit disclosed in, for example, Japanese Utility Model Application No. 641860. In FIG. 5, (2) is the toroidal core, the lead of the winding wire wound on the *nh toroidal core, and (2) the soldered part of the beam QD. In FIG. 6, @ indicates a connection land and a through hole to which the lead r211 is connected, and - indicates a printed circuit board.

Next, the action will be explained. FIG. 5 shows a transformer or inductor constructed of a toroidal core with twisted windings. In FIG. 6, a transformer tfc is a printed circuit board (c) on which an inductor is mounted. In FIG. 6, the soldering portion of the transformer or inductor lead QfJ is soldered to a connecting land (to) provided on a printed circuit board (c).

[Problem to be solved by the invention]

Coils such as conventional transformers or inductors.

Since the device is configured as described above, a material such as epoxy resin is required for attachment to a printed circuit board. Furthermore, since there is a winding between the toroidal core and the printed circuit board, it is structurally disadvantageous in terms of miniaturization in the height direction.

This invention was made to solve the above-mentioned problems, and allows a coil such as a transformer or inductor to be easily attached to a printed circuit board.

[Means for Solving the Problem] A printed circuit board mounted coil according to the present invention aims to obtain a printed circuit board mounted coil in which there is no winding between the core of the coil such as a transformer or inductor and a printed circuit board. The part of the winding that comes into contact with the printed circuit board is printed on the printed circuit board, and the other winding parts are wound with a wire from the outside of the core, and both ends of this wire are connected to the printed wiring. This is what happens.

[Effect]

The printed circuit board mounted coil of this invention is.

Printed wiring is used for part of the winding, and the core is attached to the printed circuit board using the other part of one winding, so the core can be directly attached to the printed circuit board, resulting in a smaller size in the height direction. The core can be easily attached to a printed circuit board.

〔Example〕

An embodiment of the present invention will be described below using a transformer as an example. FIG. 1 shows the configuration of the transformer.

In the figure, (1) is the printed wiring that is part of the winding, (the other part of the winding that is connected to the 21Fi printed wiring, (3) is the core using magnetic material, +41 and (6) is the transformer secondary winding M terminal. (5) and (7) are the transformer secondary side terminals. Figure 2 is a cross-sectional view of the transformer in Figure 1, and # (8) is the upper winding and printed The soldered portion of the wired winding is shown in (9) on the printed circuit board. Fig. 3 is an example of application to an inductor.

In the figure, Ql and αD are the terminals of the inductor. FIG. 4 is a cross-sectional view of the inductor of FIG. 3.

Next, the effect will be explained. As shown in Figure 1.

The primary winding of the transformer is soldered via the printed wiring of the terminal (6) from the inside (a) of the core to the outside ('b) of the core so as to fix the core with a wire (C). Similarly, as shown in (b), the terminal (4) is wired via the printed wiring O) so as to rotate around the core. The secondary winding is connected to the terminal (
7) The printed wiring is wired at terminal (5) 1 so as to rotate around the core in the same way as the next winding.

In the case of the inductor shown in FIG. 3, the core is configured to rotate using wire rods and printed wiring, similar to the transformer.

In the above embodiment, the case of a transformer was explained, but
A similar configuration can be applied to an inductor.

〔Effect of the invention〕

As described above, according to the present invention, a coil such as a transformer or inductor can be easily attached to a printed circuit board, and there is no winding between the core of the coil such as a transformer or inductor and the printed circuit board. You can get the coil.

It is possible to obtain a printed circuit board mounted coil that is miniaturized and whose core can be easily attached to a board.

[Brief explanation of drawings]

Figure +41 is a plan view showing an example of application to a transformer which is an embodiment of the present invention, and Figure 2 is a side sectional view thereof. FIG. 3 is a plan view showing an example of application to an inductor according to another embodiment of the present invention, and FIG. 4 is a side sectional view thereof. FIG. S is a perspective view of a conventional transformer using a toroidal core, and FIG. 6 is a perspective view of a conventional hybrid integrated circuit. In the figure, +11 is printed wiring, (2) is a winding connected to the printed wiring, (3) is a core, +41. +61 is the transformer-secondary winding terminal, +51. (7) is the transformer secondary winding 1B terminal, 18) is the soldering part, and (9) is the printed circuit board. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a printed circuit board mounted coil in which a coil is wound around a core made of magnetic material and mounted on a printed circuit board, the portion of the winding that contacts the printed circuit board is printed on the printed circuit board, and other A printed circuit board mounted coil characterized in that the winding portion is formed by winding a wire from the outside of the core, and both ends of the wire are connected to the printed wiring.