JPH01187909A - Transformer - Google Patents

Abstract

PURPOSE:To supply a large current to a primary winding and to obtain a transformer to be easily mounted on a printed circuit board with small size by providing the primary winding by the use of an inverted U-shaped conductor in provided at the square flange of a bobbin. CONSTITUTION:In a transformer having a bobbin 30 on which a secondary winding 2 is wound, a terminal 4 insert-molded at the flange seat 34 of its square flange 33, engaged at its lower end with a through hole 6 of secondary side and soldered for a secondary winding, and a pair of E-shaped cores 15-1, 15-2, an inverted U-shaped semiconductor pin 10 so insert-molded at the flange 33 that inverted U-shaped lower ends 10a are fitted into through holes 7 of primary side to be soldered is provided. A primary winding of 3/4 turn is composed by the use of one of pins 10, or both pins 10 are connected via the holes 7 which diagonally face to a primary winding pattern 70 formed on a printed circuit board 5, thereby composing the primary winding of substantially 2 turns.

Description

[Detailed Description of the Invention] [Summary] Regarding a transformer, particularly a transformer mounted on a printed wiring board, an object of the present invention is to provide a transformer that can allow a large current to flow through its primary winding, is compact, and is easy to implement. , a hollow body around which a secondary winding is wound, a bobbin having square flanges at both ends of the hollow body, and an inverted secondary winding terminal insert-molded in the flange seat of the square flange. and a pair of E-shaped magnetic cores that are attached to the bobbin as desired and constitute a magnetic circuit,
The lower ends of each of the inverted U-shapes were inserted into the through-holes on the primary side, and the inverted U-shaped conductor pins insert-molded into the rectangular flanges were embedded in one of the rectangular flanges so that soldering was possible. The inverted U-shaped conductor pins are used to construct a 3/4 turn primary winding.

Alternatively, by using the inverted U-shaped conductor pins embedded in each of the square flanges (33) of both sides, and connecting through the primary winding pattern provided on the printed wiring board, a primary winding of approximately 2 turns is constructed. . ■ A pair of primary winding conductors that are insert-molded vertically through the rectangular flange on both sides of the hollow hole so that the lower ends of each can be inserted into the through-hole on the primary side and soldered. A 3/4 turn primary winding is constructed by connecting the heads of the primary winding conductor bins arranged in parallel to one of the rectangular flanges with a band-shaped conductor plate.

(Industrial Application Field) The present invention relates to a transformer, particularly a transformer mounted on a printed wiring board.

Switching transistors are used in DC/DC converters etc. installed on printed wiring boards, but in order to detect the current flowing through these switching transistors,
A transformer (called a current detection transformer) is used.

The voltage value detected on the secondary side of the transformer when the primary side of the transformer is connected to a switching transistor.

Alternatively, when the current value exceeds a predetermined value, the current flowing to the primary side of the transformer, that is, the current flowing to the switching transistor, is reduced by, for example, a drooping circuit to protect the switching transistor.

Some of the transformers mounted on printed wiring boards, such as the above-mentioned current detection transformers, have a large current value on the primary side and have a primary winding of one turn to several turns.

As described above, the transformer mounted on the printed wiring board is required not only to be small and low in cost, but also to be easy to mount on the printed wiring board.

[Conventional technology]

FIG. 4 is a perspective view of a conventional example in separated form.

The bobbin 30, which is formed by molding synthetic resin, has a rectangular cylindrical hollow body having a hollow hole 32 at its axis (not shown);
A pair of square flanges 3 provided oppositely at both ends of the hollow body
3, and at the bottom of each square flange 33 is a plate-shaped flange seat 34 that horizontally supports the magnetic core.
This is provided.

Reference numeral 4 denotes an inverted secondary winding terminal made of a conductive metal rod, which is located at the center of each flange seat 34, with its upper part protruding horizontally from the side wall of the flange seat 34, and its lower tip extending from the flange. The lower part of the square flange 33 is insert molded so as to protrude perpendicularly from the bottom surface of the seat 34.

The lower tip of the secondary winding terminal 4 is fitted into a through hole 6 provided in a printed wiring board 5 and soldered.

In addition, each through hole 6 has a secondary side pattern 6
1.62 is connected to each terminal.

The secondary winding 2 is formed by tightening a thin insulated wire in a desired number of turns on the outer circumferential surface of the hollow body. It is wound and soldered to the upper end of the next winding terminal 4.

A pair of E-shaped magnetic cores 15-=1.15-2 have the same shape, and each middle leg 16 is fitted into a hollow hole 32 penetrating the hollow body from opposite directions, and the outer leg 17 is inserted outside the bobbin 30. and attach it so as to surround the bobbin 30. Then, with the end surfaces of each leg in contact with each other, the magnetic core 15-1.15
For example, an adhesive tape (not shown) is wound around the outer periphery of the magnetic cores 15-1 and 15-2 to fix the pair of magnetic cores 15-1 and 15-2.

Reference numeral 1 denotes a primary winding with a large wire diameter, which is wound 1 to 2 times around the upper layer of the secondary winding 2, and both ends of the winding are inserted into corresponding through holes 7 to form a printed wiring board. It is connected to the primary side patterns 71 and 72 provided on the back side of 5.

[Problem to be solved by the invention]

However, the above-mentioned conventional transformer has a problem in that it is difficult to wind the -order winding because the wire diameter of the -order winding is large.

In addition, since the wire diameter of the -order winding is large, it is not possible to closely overlap the secondary winding, and the outer diameter of the -order winding becomes large.

There is also the problem that the magnetic core becomes large, preventing miniaturization of the transformer.

The present invention was created in view of the above points, and an object of the present invention is to provide a transformer that can allow a large current to flow through the -order winding, is small, and is easy to implement.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a secondary winding v
A hollow body 31 for winding A2, a bobbin 30 having a rectangular flange 33 at both ends of the hollow body 31, and an inverted insert molded on the flange seat 34 of the rectangular flange 33, and a secondary winding 2 at the upper end. The lower end is inserted into the through hole 6 on the secondary side and soldered to the secondary winding terminal 4, the middle leg is inserted into the hollow hole 32 penetrating the hollow body 31, and the remaining part is connected to the bobbin. 30, and a pair of E-shaped magnetic cores 15-1 and 15-2 constituting a magnetic circuit, ■ Insert each lower end 10a of the inverted U shape into the through hole 7 on the primary side. so that it can be soldered,
The inverted U-shaped conductor pin 10 is insert molded into the square flange 33.

As illustrated in FIG. 1, an inverted U-shaped conductor pin 10 is embedded in each of both square flanges 33, and diagonally opposing through holes 7 are provided on the back surface of the printed wiring board 5. They are connected via the primary winding pattern 70 to configure approximately two turns of the primary winding.

Alternatively, as illustrated in FIG. 2, an inverted U-shaped conductor bin 10
is buried in only one square flange 33, and this inverted U-shaped conductor bin 10 is used to form a 3/4 turn primary winding.

■ The lower tip 11a of each primary winding conductor bin,
It is possible to insert and solder into the through hole 7 on the primary side.
A pair of primary winding conductor bins are attached to the square flange 33 so as to vertically pass through the square flange 33 on both sides of the hollow hole 32.
Insert mold into.

As illustrated in FIG. 3, a pair of primary winding conductor bins 11-1.11 are attached to one of both square flanges 33.
-2 to the other, a pair of primary winding conductor bins 11-3.1
1-4 are installed in parallel. Primary winding conductor bin 11-
1 and 11-2 heads, and primary winding conductor bin 11-3
and 11-4 are connected by a band-shaped conductor plate 13, respectively.

Furthermore, a band-shaped winding conductor plate 1 wound on the upper layer of the secondary winding 2
Connect the terminals of 4 to the primary winding conductor pins 1 diagonally opposite each other.
They are connected to the heads of windings 1-2 and 11-3, respectively, to form primary windings of desired turns.

Alternatively, although not shown, a pair of primary winding conductor bins 11 are arranged side by side only on one square flange 33. Then, using the strip-shaped conductor plate 13, the primary winding direction conductor pin 11 is
Connect the head of the wire to form a 3/4 turn primary winding.

[Effect]

According to the present invention, the inverted U-shaped conductor pin 10. The cross-sectional area of the primary winding conductor pins 11 can be made to a desired size by selecting a large wire diameter. Moreover, the strip-shaped conductor plate 13. The band-shaped wire-wound conductor plate 14 has a thin plate thickness,
By selecting the plate width as desired, the cross-sectional area can be made to a desired size.

Therefore, a large current can be passed through the -order winding, and it functions as a primary winding with approximately one turn or several turns.

On the other hand, in order to connect the negative winding to the primary pattern provided on the printed wiring board 5, the lower end 10a of the inverted U-shaped conductor pin 10 is
, or insert the lower end 11a of the primary winding conductor pin 11 into the corresponding through hole 7.

To connect the secondary winding to the secondary winding provided on the printed wiring board 5, insert the lower end of the secondary winding terminal 4 into the through hole 6 provided on the printed wiring board 5. Since the through holes 6.7 are provided on the basic grid of the printed wiring board, the dimensional accuracy of their relative positions is highly accurate.In addition, the inverted U-shaped conductor pin 10, the primary winding conductor pin 11 . and the secondary winding terminal 4 are insert-molded on the bobbin 30, and the relative positions of their lower tips are determined by the molding die and are highly accurate.

Also, an inverted U-shaped conductor pin 10. Conductor pin 11 for primary winding
can be easily processed by press working etc. before molding. Furthermore, although the strip-shaped winding conductor plate 14 has a large cross-sectional area, it is thin and has flexibility, so the secondary winding 2
It is easy to wrap it tightly around the

Therefore, the work of mounting the transformer is easy, and the transformer is small.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

Fig. 1 is a diagram of an embodiment of the present invention described in item 1, (a) is a perspective view shown in separated form, (bl is a front view with the magnetic core removed, and Fig. 2 is a diagram showing the embodiment of the present invention in item 1). FIG. 3 is a perspective view of the embodiment of the present invention in Section 2, (a) is a perspective view shown in separated form, and (bl is a front view with the magnetic core removed).

In FIG. 1, a bobbin 30 made of an insulating material, for example a synthetic resin, is formed by molding a prismatic hollow body 31 having a hollow hole 32 at its axis, and a hollow body 31 having a hollow body 31 at both ends thereof. It consists of a pair of square flanges 33 provided.

The square flange 33 has an L-shape on the outside, and a plate-shaped flange seat 34 is provided at the bottom of the square flange 33 to horizontally support the magnetic core.

4 is an inverted secondary winding terminal made of a conductive metal rod (for example, brass, etc.), and each flange seat 34
Insert molding is performed on the lower part of the rectangular flange 33 so that the upper part projects horizontally from the side wall of the flange seat 34 and the lower end projects vertically from the bottom surface of the flange seat 34.

The lower tip of the secondary winding terminal 4 is fitted into a through hole 6 provided in a printed wiring board 5 and soldered.

In addition, each through hole 6 has a secondary side pattern 6
1.62 is connected to each terminal.

A thin insulated wire is wound around the outer peripheral surface of the hollow body in a desired number of tens of turns to form the secondary winding 2, and its terminal 2a is connected to the flange seat 34.
It is pulled out to the outside of the flange seat 34 through a slit provided on the lower surface of the terminal, and is wound and soldered to the upper end of the secondary winding terminal 4.

Each middle leg 16 of a pair of E-shaped magnetic cores 15-1, 15-2 is inserted into the hollow hole 32 penetrating the hollow body 31 from the opposite direction, and the outer leg 17 is placed outside the bobbin 30, and the bobbin Attach it so that it surrounds 30.

Then, with the end surfaces of each leg in contact with each other, place the magnetic core 1
A pair of magnetic cores 15-1.15-2 are fixed by wrapping, for example, an adhesive tape (not shown) around the outer periphery of the magnetic cores 15-1.15-2.

10 is a highly conductive metal (for example, brass) having a desired wire diameter.

This is an inverted U-shaped conductor bin made of copper, bronze, aluminum, etc.).

The inverted U-shaped conductor pin 10 is connected to the lower end 1 of each inverted U-shaped conductor pin 10.
0a, the primary side through-holes 7a and 7b are paired below one square flange arranged on the printed wiring Fi5,
Insert molding is performed on both square flanges 33 so that the through holes 7c and 7d paired below the other square flange side can be fitted and soldered, respectively.

Further, the through holes 7b and 7CI diagonally opposing each other on the back surface of the printed wiring board 5 are connected via a primary winding pattern 70 provided on the back surface of the printed wiring board 5, and the primary winding is approximately two turns. It's a line.

The patterns 71 and 72 on the primary side are connected to the through holes 7a + 7d +, respectively.

The first aspect of the present invention, as described above, provides an inverted U-shaped conductor pin 1.
By selecting a large wire diameter, the cross-sectional area can be made to a desired size, and a large current can be passed through the -order winding.

Further, the inverted U-shaped conductor pin 10 can be extremely easily formed into an inverted U-shape by press working or the like before insert molding. On the other hand, in order to connect the negative winding to the primary patterns 71 and 72 provided on the printed wiring board 5, the lower end 10a of the inverted U-shaped conductor pin 10 is connected to the corresponding through hole 7a.
+7b, 7c+7d, and the mounting work is easy.

Also, the -order winding is secondary winding! Since there is no need to wind the outer layer of bobbin 30. And the external dimensions of the magnetic core are small (so the transformer is small).

Note that the cross section of the inverted U-shaped conductor pin 10 is not limited to a circular shape, but may be rectangular, for example.

The transformer illustrated in FIG. 2 has one square flange 33
The secondary winding terminals 4 are insert-molded in parallel on the flange seat 34 of the secondary winding terminal 4, and the lower ends of the secondary winding terminals 4 are inserted into the through holes 6 on the secondary side parallel to the printed wiring board 5. ,
It is designed to be soldered.

Then, an inverted U-shaped conductor pin 10 is insert molded into the other square flange 33, and the lower end 10a of each inverted U-shaped conductor pin 10 is inserted into the through hole 7 on the primary side parallel to the printed wiring board -1-. The primary winding is configured to be inserted into each of the coils and soldered to form a 3/4 turn primary winding.

The transformer shown in FIG. 2 has the advantage that the distance between the negative winding terminal and the secondary winding terminal can be made sufficiently large, and the voltage resistance is improved.

In FIG. 3, a secondary winding terminal 4 is insert-molded in the center of each flange seat 34. Each terminal 2a of the secondary winding 2 wound around the hollow body of the bobbin 30 is connected to the upper end of the secondary winding terminal 4 by soldering.

The lower tips of the secondary winding terminals 4 are fitted into corresponding through holes 6 on the secondary side and soldered to connect to the secondary side patterns 61 and 62, respectively.

The middle legs of each of the pair of E-shaped magnetic cores 15-L 15-2 are fitted into the hollow hole of the hollow body from opposite directions, and the outer legs are placed outside the bobbin 30, so as to surround the bobbin 30. It is.

11 is a highly conductive metal rod (for example, brass +
This is a conductor pin for the primary winding, which is made by cutting a piece of (fl, bronze, aluminum, etc.) to a desired length longer than the height of the rectangular flange 33.

On one square flange 33, a pair of primary winding conductor pins 11-1, 11-2. are insert-molded, and a pair of primary winding conductor bins 11-3, 11-4. It is an insert mold.

Then, the heads of the primary winding conductor bins 11-1 and 11-2 and the heads of the primary winding conductor bins 11-3 and 11-4 are shaped into strips such as brass bundles or copper strips, respectively. Conductor Fi1
Connect with 3 and solder.

Furthermore, a strip-wound vA conductor plate 14 such as a brass bundle or copper strip whose outer peripheral surface is insulated as desired is wound spirally on the upper layer of the secondary winding 2 for a desired number of turns, and one of its terminals is connected to the primary winding. Solder the other end to the heads of the winding conductor bins 11 and 20, and solder the other end to the head of the primary winding conductor bin 11-3, which is arranged diagonally from the primary winding conductor bin 11-2. Attachment means connection.

The lower end of the primary winding conductor pin 11-1 is inserted into the through hole 7a on the primary side, the lower end of the primary winding conductor pin 11-2 is inserted into the through hole 7b, and the lower end of the primary winding conductor pin 11-3 is inserted into the through hole 7b. The lower tip is fitted into the through hole 7c on the primary side, and the lower tip of the primary winding conductor pin 11-4 is fitted into the through hole 7d on the primary side and soldered.

Note that the patterns 71 and 72 on the primary side are connected to through holes 7a and 7d, respectively. Therefore, the primary winding conductor pins 11-2, 11-3. It is not necessary to cut the lower end of the through hole 7b17c+.

Also, although not shown, insert mold terminals for the secondary winding in parallel on the flange seat of one square flange, insert them into the through holes on the secondary side parallel to the printed wiring board, and solder them. Configure it as follows.

Then, a pair of primary winding conductor pins 11 are arranged side by side on the other square flange, and their respective heads are connected using a band-shaped conductor plate, so that it can be used as a 3/4 turn primary winding. good.

(Effects of the Invention) As explained above, the present invention provides a transformer in which the -order winding is configured using an inverted U-shaped conductor bin provided on the rectangular flange of the bobbin or a conductor bin for the primary winding, - It has excellent practical effects, such as allowing a large current to flow through the secondary winding, being small in size, and being easy to mount on a printed wiring board.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an embodiment of the present invention in Section 1, (a) is a perspective view shown in separated form, (hl is a front view, and FIG. 2 is another embodiment of the present invention in Section 1). Fig. 3 is a perspective view of the embodiment of the present invention in Section 2, (al is a perspective view shown in separated form, (b) is a front view, and Fig. 4 is shown in separated form of the conventional example. In the figure, 1 is a primary winding, 2 is a secondary winding, 4 is a terminal for the secondary winding, 5 is a printed wiring board, 6, 7.7a, 7b, 7c, 7d are through hole,
10 is an inverted U-shaped conductor bin, 11.11-1.11-2.11-3.11-4 is a primary winding conductor bin, 10a and 11a are lower tips, 13 is a strip-shaped conductor plate, and 14 is a strip-shaped winding. A wire conductor plate, 15-1, 15-2 is a magnetic core, 30 is a bobbin, 31 is a hollow body, 32 is a hollow hole, 33 is a square flange, and 34 is a flange seat. 2g Wooden Ax 蛯 (``O 汀了ding糾いLA 1ρ- ICE'ENBE (Page 11 A Bl'', /) I's Pregnancy (Fang Zhen Hiig.
No. 1 Sogyi Fake 141 蓼 2nd Ward (b) ) The throat of the bar 2nd page, the character of IU Shiro (Hokami Hiiku, 1, Figure 1.4 ---

Claims (2)

[Claims] 1. a hollow body (31) around which a secondary winding (2) is wound;
and square flanges (33) at both ends of the hollow body (31).
A bobbin (30) having a rectangular flange (33) has an inverted L shape insert-molded on the flange seat (34), and the terminal of the secondary winding (2) is connected to the upper end, and the lower end is connected to the secondary winding (2). The secondary winding terminal (4) is inserted into the through hole (6) on the next side and soldered, and the middle leg is inserted into the hollow hole (32) passing through the hollow body (31), and the remaining part is inserted into the bobbin. (30), a pair of E-shaped magnetic cores (15-1
, 15-2), the lower end (10a) of each inverted U-shape is connected to the through hole (
7) so that it can be inserted and soldered to the square flange (
33) is equipped with an inverted U-shaped conductor pin (10) embedded in one of the rectangular flanges (33) to form a 3/4 turn primary winding. , or by using the inverted U-shaped conductor pins (10) embedded in each of the square flanges (33), connect the diagonally opposing through holes (7) to the printed wiring board (
5) A transformer characterized in that the transformer is connected via the primary winding pattern (70) provided in 5) to form a primary winding of approximately two turns. 2. A bobbin having a hollow body around which a secondary winding (2) is wound, and square flanges (33) at both ends of the hollow body.
30) and the flange seat (34) of the square flange (33).
) is insert-molded in an inverted L shape, and the terminal for the secondary winding (2) is connected to the upper end, and the lower end is inserted into the secondary side through-hole (6) and soldered. (4), and a pair of E-shaped magnetic cores (15-1, 15-2) whose middle legs are inserted into hollow holes penetrating the hollow body, and whose remaining parts surround the bobbin (30) to form a magnetic circuit. In a transformer equipped with
7) is provided with a pair of primary winding conductor pins (11) which are insert-molded vertically through the rectangular flange (33) on both sides of the hollow hole so that they can be inserted and soldered to the hollow hole; Connecting the heads of the primary winding conductor pins (11) arranged in parallel to one of the rectangular flanges (33) with a band-shaped conductor plate (13) to form a 3/4 turn primary winding, or The heads of the primary winding conductor pins (11) arranged in parallel on both of the rectangular flanges (33) are connected to the belt-shaped conductor plates (1).
3), and the heads of the diagonally opposing primary winding conductor pins (11) are wound on the upper layer of the secondary winding (2). A transformer characterized in that the terminals are connected to form a primary winding of a desired turn.