JPH0732931U - Transformer structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate insulation design between transformer terminals and to suppress the length of protrusion of the transformer from the printed circuit board. [Structure] An iron core and a printed circuit board having two notches, into which the iron core is inserted, the iron core being exposed on a first surface of the printed circuit board of the iron core. The first coil is wound, the end of the coil is connected to the terminal connecting portion provided on the first surface, and the second coil is wound on the core portion exposed on the second surface of the printed circuit board. The end of this coil is connected to the terminal connecting portion provided on the second surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a transformer mounted on a printed circuit board.

[0002]

[Prior art]

 As shown in FIGS. 7 and 8, the structure of the conventional transformer is printed by connecting the ends of the primary coil 7b and the secondary coil 6b wound around the toroidal core 3b to the terminal connecting portion 9b of the bobbin 12b. The terminal 15b mounted on the circuit board 1b and connected to the terminal connecting portion 9b is soldered to a predetermined land of the printed circuit board 1b. Alternatively, as shown in FIG. 9 and FIG. 10, the ends of the primary coil 7c and the secondary coil 6c wound around the bobbin 12c mounted on the CI type iron core 14c are connected to the terminal connecting portion 9c provided on the bobbin 12c. It was connected and mounted on the printed circuit board 1c, and the terminal 15c was soldered to a predetermined land of the printed circuit board 1c.

[0003]

[Problems to be solved by the device]

 In such a conventional example, since the terminals provided on the transformer are on the same surface of the printed circuit board, it is necessary to consider the distance between the terminals in order to improve the insulation. Further, since the transformer has a bobbin mounted on a printed circuit board and an iron core is mounted on the bobbin, the mounting height of the transformer is surely increased.

The present invention has been made in view of the above points, and an object of the present invention is to facilitate the design in consideration of the insulation between the terminals of the transformer and to prevent the protrusion length of the transformer from the printed circuit board. It is to provide a transformer structure that suppresses the size.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention comprises an iron core and a printed circuit board having two notches, and the iron core is inserted through the notches, and the first printed circuit board of the iron core is provided. The first coil is wound around the iron core portion exposed on the surface of the printed circuit board, the end of the coil is connected to the terminal connecting portion provided on the first surface, and is exposed on the second surface of the printed circuit board. The second coil is wound around the iron core portion, and the end of this coil is connected to the terminal connecting portion provided on the second surface.

[0006]

[Work]

 The first coil is wound around the iron core portion exposed on the first surface of the printed circuit board of the iron core, and the end of this coil is connected to the terminal connection portion provided on the first surface, and the first core of the printed circuit board is connected. Since the second coil is wound around the iron core portion exposed on the second surface and the end of this coil is connected to the terminal connecting portion provided on the second surface, the first coil and the second coil are separated from each other. It is separated by a printed circuit board and can be easily insulated.

[0007]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. The printed circuit board 1 is provided with two notches 2 on the end surface, and the toroidal core 3 is inserted through the notches 2. The toroidal core 3 is formed on the first surface of the printed circuit board 1. The secondary coil is wound around the iron core portion exposed at 4, and the terminal 8 of this coil is connected to the terminal connecting portion 9 provided on the first surface 4, and is exposed at the second surface 5 of the printed circuit board. The primary coil 7 is wound around the iron core portion, and the end 10 of the coil 7 is connected to the terminal connecting portion 11 provided on the second surface 5.

The minimum distance n between the two notches 2 is substantially the same as the inner diameter of the toroidal core 3, and the maximum distance m between the two notches 2 is larger than the outer diameter of the toroidal core 3. The depth l of the two notches 2 is deeper than the thickness of the toroidal core 3.

Therefore, the inside of the toroidal core 3 is fitted and retained in the notch 2 of the printed circuit board. Further, the primary coil wound around the toroidal core 3 is connected to the terminal connection portion 11 between the two notches 2 at low voltage, and the secondary coil wound around the toroidal core 3 is wound at high voltage. Since the notch 2 is connected to the outward terminal connecting portion 9, the insulation between the coils can be sufficiently obtained. Further, since the height of the toroidal core 3 is distributed to the front and back of the printed circuit board, at least the total thickness of the printed circuit board and the height of the terminals protruding on the solder surface of the printed circuit board is reduced.

Next, a second embodiment will be described with reference to FIGS. 4, 5 and 6. The C core 3e and the I core 3d make up a pair of iron cores 3a that form a single closed magnetic circuit, and a printed circuit board 1a that has two openings 2a and through which the iron cores 3a are inserted. Then, the primary coil 7a is wound around the C core 3e arranged on the first surface 4a of the printed circuit board 1a of the iron core 3a, and the end 10a of the coil 7a is provided on the first surface 4a. The secondary coil 8a is wound around the I core 3d arranged on the second surface 5a of the printed circuit board 1a by connecting to the terminal connecting portion 11a, and the end 8a of the coil 6a is moved to the second surface 5a. It is connected to the provided terminal connecting portion 9a.

For this reason, the primary coil 7a, the secondary coil 6a, and the connecting portions of the respective coils are separated by the printed board 1a and can be easily insulated. Further, since the printed circuit board 1a is mounted between the C core 3e and the I core 3d of the iron core 3a, the mounting height of the iron core 3a becomes low as in the first embodiment.

[0012]

[Effect of device]

 As described above, the structure of the transformer according to claim 1 comprises an iron core and a printed circuit board having two notches, and the iron core is inserted through the notches. The first coil is wound around the iron core portion exposed on the first surface, the end of this coil is connected to the terminal connecting portion provided on the first surface, and exposed on the second surface of the printed circuit board. Since the second coil is wound around the iron core part and the end of this coil is connected to the terminal connecting portion provided on the second surface, insulation between the first coil and the second coil is maintained. A good printed circuit board can be inserted.

Therefore, the insulation between the first coil and the second coil can be facilitated. Further, since the iron cores are distributed to the front and back of the printed circuit board, at least the total thickness of the printed circuit board and the height of the terminals protruding on the solder surface of the printed circuit board is reduced. Therefore, the mounting height of the transformer can be reduced.

Further, in the structure of the transformer according to claim 2, the iron core is divided into two and is composed of a pair of iron cores that are combined to form a single closed magnetic circuit. Notches can be provided in the printed circuit board for mounting.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a first embodiment of the present proposal.

FIG. 3 is a partial view of a printed circuit board showing a first embodiment of the present invention.

FIG. 4 is a perspective view showing a second embodiment of the present invention.

FIG. 5 is a side view showing a second embodiment of the present invention.

FIG. 6 is a plan view of a printed circuit board showing a second embodiment of the present invention.

FIG. 7 is a perspective view showing a first conventional example.

FIG. 8 is a side view showing a first conventional example.

FIG. 9 is a perspective view showing a second conventional example.

FIG. 10 is a side view showing a second conventional example.

[Explanation of symbols]

 1, 1a, 1b, 1c Printed circuit board 2 Notch 3 Toroidal core 4, 4a First surface 5, 5a Second surface 6, 6a Secondary coil 7, 7a Primary coil

Claims (2)

[Scope of utility model registration request] 1. An iron core and a printed circuit board having two notches, into which the iron core is inserted, the iron core being exposed on a first surface of the printed circuit board of the iron core. The first coil is wound around the part, and the end of this coil is connected to the terminal connecting portion provided on the first surface,
A structure of a transformer characterized in that a second coil is wound around an iron core portion exposed on a second surface of a printed circuit board, and an end of the coil is connected to a terminal connecting portion provided on the second surface. . 2. The structure of a transformer according to claim 1, wherein said iron core is divided into two and is composed of a pair of iron cores which are combined to form a single closed magnetic circuit.