JPH04130609A - Transformer - Google Patents

Abstract

PURPOSE:To suppress an adverse effect due to a high-frequency current in a winding conductor and to facilitate the heat dissipation of a magnetic material by a method wherein the magnetic material is constituted so that the series-connection and parallel-connection of insulating conductors are combined each other, a secondary or primary winding of a prescribed total number of windings is constituted and a prescribed winding ratio is obtained. CONSTITUTION:Insertion holes 21 are provided in two rows at constant intervals in the direction of the plate thickness of a tabular magnetic material 2. Two pieces of insulating conductors 3 and 4 molded into a U-shaped form are made to penetrate each of these holes 21 corresponding to each other between the rows, one end 31 of the conductor 3 is connected with an end 32-A, which is located on the side of other row, of an insulating conductor 3-A adjacent to the conductor 3 and other end 31-A of the conductor 3-A is further connected with an end 32-B, which is located on the side of other row, of an insulating conductor 3-B adjacent to the conductor 3-A. After this, this is repeated and the number of prescribed pieces of the ends of the conductors are series-connected to form the connections into the form of a solenoid coil. Or, the fellow ends 31, 31-A, 31-B... on the side of the same row of the conductors 3, 3-A, 3-B... and the fellow ends 32, 32-A, 32-B... are connected to each other, the number of prescribed pieces of the ends are parallel-connected, these series- connections and the parallel-connections are combined with each other, are connected to each other in such a way that the same current flows through each connection and a primary or secondary winding is constituted. The conductors 4 are also connected in the same way as that in the case of the conductors 3.

Description

[Detailed Description of the Invention] [Summary] Regarding transformers used in DC/DCC/type transformers for power supply, the present invention suppresses the adverse effects of high-frequency currents in winding conductors, facilitates heat dissipation, and contributes to production automation. In order to provide a transformer capable of Penetrate two insulated conductors formed into a letter shape, connect one end of the insulated conductor to the end of the adjacent insulated conductor on the other row side, and connect the other end of the adjacent insulated conductor to the end of the adjacent insulated conductor. Connect the ends of the insulated conductors on the other row side, and then repeat this to connect a predetermined number of insulated conductors in series to form a solenoid coil, or connect the ends of the same row of the insulated conductors to form a solenoid coil. connect in parallel,
This series connection and parallel connection are combined and connected so that the same current flows through each to constitute a primary or secondary winding with a predetermined total number of turns, and other insulated conductors are also connected in the same way as the above insulated conductor.
A series connection and a parallel connection are combined and connected so that the same current flows through each to form a secondary or primary winding with a predetermined total number of turns to obtain a predetermined turns ratio, A magnetic material is tightly fixed on the surface of a non-magnetic member made of a non-metal plate, or both ends of an insulated conductor are formed into contact terminals of a connector, and each insulated conductor is connected in series on the connector side that is mated and connected to the connector. and are connected in parallel to form a winding.

[Industrial application field]

The present invention relates to a transformer used in a DC/DC converter for power supply.

BACKGROUND ART Electronic communication circuits constructed using semiconductor components are being pursued to have higher performance and smaller size, and exactly the same is required of power supplies that supply power to these circuits.

[Conventional technology]

The DC/DC converter in such a power supply device uses a transistor chopper to intermittent the input DC power, flows it to the primary winding of the transformer, and converts the voltage to the secondary winding with a predetermined turns ratio. This is then rectified and output to provide DC power.

The particularly large component here is the transformer, which has a ring-shaped, ET-type, etc. magnetic core with primary and secondary conductor windings at a predetermined winding ratio. In order to improve efficiency, the driving frequency of the transistor chopper was increased,
This can be achieved by using a transformer that operates at high frequencies.

Currently, high frequencies up to about 500 kHz have been put into practical use.

[Problem to be solved by the invention]

However, ■ As transformers become higher frequency and more compact, the current in the winding conductor causes a skin effect within the conductor, increasing the conductor resistance.
Furthermore, a proximity effect appears between conductors, increasing conductor resistance, so a wire-wound conductor with a large surface area is required. That is,
The winding space becomes larger, which goes against the trend of downsizing.

■ Also, eddy current loss occurs in the magnetic core.

■ Due to the above, efficiency is suppressed and heat is generated.

■ In addition, the primary and secondary windings must be wound to a predetermined winding ratio, which not only limits miniaturization but also poses a barrier to automation and economic efficiency of production. .

There are other problems.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to provide a transformer that suppresses the adverse effects of high-frequency currents in winding conductors, facilitates heat dissipation, and contributes to production automation.

[Means to solve the problem]

The above purpose is as shown in FIG. 1. [1] Two rows of insertion holes 21 are arranged at regular intervals in the thickness direction of the plate-shaped magnetic body 2, and each of the insertion holes 21 corresponds between the rows. , the two insulated conductors 3.4 formed in the shape of an opening are passed through, and one end 31 of the insulated conductor 3 is connected to the end 32-A of the adjacent insulated conductor 3-A on the other row side. Connect the other end 31-A of the insulated conductor 3-A to the end 32-B of the adjacent insulated conductor 3-B on the other row side, and repeat this to connect a predetermined number of conductors in series. The insulated conductor 3.3-A may be formed in the form of a solenoid coil.

3-B... end 31 on the same row side 31-A, 31-
B...each other, and ends 32.32-A, 32-B...
・Connect them together, connect a predetermined number of them in parallel, combine these series connections and parallel connections, and connect them so that the same current flows through each to form a primary or secondary winding with a predetermined total number of turns. Similarly to the insulated conductor 3, the insulated conductor 4 is also connected in series and in parallel so that the same current flows through each of them to form a secondary or primary winding with a predetermined total number of turns. This is achieved by the transformer I of the invention, which is configured to obtain a predetermined turns ratio.

[2] It is also applicable to the transformer 11 of the second invention, in which the magnetic body 2 of the transformer 1 is closely fixed to the surface of a non-magnetic member 6 made of a non-metal plate.

[3] Furthermore, both ends 31 of the insulated conductors 3 and 4 of the transformer l
, 32, 41, 42 are formed on the contact terminal 51 of the connector 5, and on the side of the connector 7 which is fitted and connected to this, each insulated conductor 3.4 is connected in series and parallel to form a winding.
This is also achieved by the transformer 12 of the third invention.

[For production]

That is, as shown in the plan view for explaining the principle of FIG. 3 is marked with a ○, and the insulated conductor 4 is marked with a ◎.The end of the insulated conductor 3.4 passing through the insertion hole 21 of the first row is 31°41, and the end on the second row side is 32.42. .

Current flows downward from the top of the insulated conductor 3 on the inductive side from the top of the figure marked with a cross, and it is folded back in a U-shape on the back side, and current flows upward from the bottom of the figure marked with . The current generates a magnetic field around the insertion hole 21 of the magnetic body 2 as indicated by the dotted arrow.

Here, all the insulated conductors 3 are connected in series and parallel so that the current flowing through them is the same, and the intervals between the insertion holes 21 are also constant and equal, so that similar magnetic fields are generated.

At this time, the insulated conductor 4 on the induced side is induced by the same magnetic field as that generated by the insulated conductor 3 inserted into the same insertion hole 21, and the same induced voltage is induced, and all the insulated conductors 4 have the same voltage.

Therefore, by connecting the number of insertion holes 21 of the magnetic body 2 and the respective insulated conductors 3.4 in series and parallel, an arbitrary turns ratio can be obtained.

For example, in the case of 1:3, there are three insertion holes 21 in each row.
A predetermined winding ratio can be obtained by connecting all the insulated conductors 3 in series and connecting all the insulated conductors 4 in parallel.

In the case of 2:3, six insertion holes 21 are provided in each row, and three insulated conductors 3 are connected in parallel and two groups are connected in series to form a total number of turns of 2, Two insulated conductors 4 may be connected in parallel, and three groups thereof may be connected in series to form a total number of turns of three.

Furthermore, as shown in the transformer of the second invention shown in FIG. , non-magnetic member 6
For example, if a thermally conductive ceramic member is used, heat radiation can be improved and a thin plate-like mounting space can be formed.

Furthermore, as shown in the transformer of the third invention shown in FIG. Tonashi,
By connecting each insulated conductor 3.4 in series and in parallel to form a winding on the connector 7 side that is mated and connected to the connector 5, the winding ratio is determined by the connection state on the connector 7 side. The transformer 12 can also be used with different turns ratios.

For example, in a transformer 12 in which ten insertion holes 21 are provided in each row and insulated conductors 3.4 are passed through all of them, the turns ratio is 1:1 to 1:10.2:3 to 2:5. Can be used commonly for 13 types.

Thus, the insulated conductors 3.4 only need to be connected through the magnetic body 2 without winding any of them, so that the proximity effect is minimized and the skin effect is reduced by increasing the conductor cross section. This makes it possible to suppress the negative effects of high-frequency currents in the winding conductor and to easily dissipate heat with the non-magnetic member 6, resulting in a thin transformer that can also contribute to production automation. It becomes possible to provide

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings. The same reference numerals indicate the same objects throughout the figures. Figure 2 (
FIG. 1A shows a transformer according to an embodiment of the present invention, FIG. 1B shows an embodiment of the second invention, and FIG. 1C shows an embodiment of the third invention.

This example was applied to a DC/DCC/type converter with a maximum output of 100 W that converts 48 V to 5 V and supplies DC power to an electronic circuit device composed of semiconductor components. In order to improve efficiency, the frequency used by the transformer was set as high as possible, above IMHz.

In this embodiment, the transformer has a good winding ratio of 3:l, and the magnetic member is made of a new ferrite material that has low loss and high saturation magnetic flux density even at frequencies above 1MHz.
As shown in the figure, a plate-shaped magnetic body 2 measuring 30 x 35 x 10 mm in thickness is provided with two rows of insertion holes 21 each having a diameter of 5 mm in the longitudinal direction at a center interval of 10 mm and three rows at a center interval of 15 mm. Between the rows are two insulated conductors 3.4, each made of copper wire with a semicircular cross-section, the thickness of which is equal to the width of the insertion hole 21 and the groove, insulated with synthetic resin and bent into a U-shape with an opposing spacing of 20 mm. It is inserted astride.

Since the winding ratio is 3=1, three insulated conductors 3 are connected in series in a solenoid coil shape to form a total number of turns of 3, and three insulated conductors 4 are connected in parallel to form a total number of turns of 1. As a result, a winding ratio of 3:l is obtained.

As shown in FIG. 2(b), the transformer 11 of the second invention is made of a 50 x 30 x 5 thick ceramic plate material with good thermal conductivity.
The non-magnetic member 6 of mm is attached to the magnetic body 2 of the transformer 1 with an adhesive.
The transformer 11 is closely bonded to the back side of the transformer 11, and is screwed to the structural board using fixing holes 61 drilled in the longitudinal edges, thereby dissipating heat and fixing the transformer 11.

The transformer 12 according to an embodiment of the third invention is as shown in FIG.
32, 41, and 42 are formed on the contact terminals 51 of the connector 5, and the connector 7 is fitted and connected to the contact terminals 51 and fixed to the structural board.
On the side, insulated conductors 3 are connected in series and insulated conductors 4 are connected in parallel to form a winding, and a winding ratio of 3:l is obtained.

In this case, the transformer 1 itself does not constitute a winding, but only functions when connected to the connector 7. If the connector 7 is connected differently, the winding ratio will change even if the transformer is the same. It can be used in three types: 1:1, 1:2 and I:3.

The above embodiments are merely examples, and the shapes, dimensions, and materials of each part are not limited to those described above.

For example, although the connector 5.7 is a multi-connector, it is also possible to use a single connector for each end 31.32.41.42 of the insulated conductor 3.4.

Also, the non-magnetic member 6 is closely fixed to the magnetic body 2 of the transformer 12 and fixed to the structural board, and the connector 5.
7 connections are made, and the combinations are free.

〔Effect of the invention〕

As described above, according to the present invention, a winding is constructed by passing a conductor through a magnetic material and connecting the ends, and there is no need to wind the wire.
In addition, it can be commonly used for different winding ratios, suppresses the negative effects of proximity effect and skin effect caused by high frequency current in the winding conductor, and facilitates heat dissipation with non-magnetic materials, contributing to production automation. It can be done and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, (a) is an explanatory plan view, (b) is a transformer of the second invention, (c) is a transformer of the third invention, and Fig. 2 is an embodiment of the present invention. (a) is a transformer, (b) is an embodiment of the second invention, and (C) is an embodiment of the third invention. In the figure, 1, 11.12 are transformers, 2 is magnetic material, 3, 3-
A, 3-B, 4 is an insulated conductor, 5.7 is a connector,
6 is a non-magnetic member, 21 is an insertion hole, 51
are contact terminals, 31, 31-A, 31-B, 32.3
2-A, 32-B, 41.42 are ends, and 61 is a fixing hole.

Claims (1)

[Scope of Claims] [1] Insertion hole (21) in the thickness direction of the plate-shaped magnetic body (2)
are arranged in two rows at regular intervals, and two U-shaped insulated conductors (3, 4) are passed through each of the corresponding insertion holes (21) between the rows, and the insulated conductors ( Connect one end (31) of 3) to the adjacent insulated conductor (3-
A), and connect the other end (31-A) of the adjacent insulated conductor (3-A) to the other end (31-A) of the adjacent insulated conductor (3-B). Connect it to the end (32-B) on the other row side, and then repeat this to connect a predetermined number of conductors in series to form a solenoid coil shape. Alternatively, the insulated conductor (3) (3-A) ( 3-B)...
・Ends on the same row side (31) (31-A) (31-B)・
・・each other, and the ends (32) (32-A) (32-B)・
...connect them together, connect a predetermined number of them in parallel, combine these series connections and parallel connections, and connect them so that the same current flows through each to create a primary or secondary winding with a predetermined total number of turns. Similarly to the insulated conductor (3), the insulated conductor (4) also combines series connection and parallel connection, and is connected so that the same current flows through each, to form a secondary or primary coil with a predetermined total number of turns. A transformer characterized in that the next winding is configured to obtain a predetermined turns ratio. [2] The transformer according to claim 1, wherein the magnetic body (2) is closely fixed to the surface of the non-magnetic member (6) made of a non-metallic plate. [3] Both ends (31, 32, 41,
42) is formed on the contact terminal (51) of the connector (5), and the insulated conductors (3, 4) are connected in series and parallel on the side of the connector (7) that is fitted and connected to the connector (5). The transformer according to claim 1, characterized in that it comprises a winding.