JP2007036191A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output transformer of winding type which is suitable for small size and multiple outputs, being excellent in efficiency. <P>SOLUTION: Two or more tubular bobbins arranged parallel to each other, at given intervals, for binding together, are inserted with an I type core, respectively. A C-type core is stacked on the parallel plane of the I type cores, with a specified interval in the direction vertical to the parallel plane. Both end protrusions of the C type core are bound to both ends of two I type cores, forming a closed magnetic path. Each of I type cores is attached with a primary coil through the bobbin. A secondary winding is attached, adjoining both sides of the primary winding, by way of the bobbin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transformer for use in an inverter or the like for driving a lighting fixture such as a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or an EL plate (electric luminescence plate).

Conventionally, as shown in FIG. 19, a multi-output transformer in which a primary ring 4 and a large number of secondary windings 8 are mounted on a square ring core 2 is known (for example, see Patent Document 1).
Conventionally, as shown in FIG. 20, the E-type core 10 and the E-type core 12 are joined, the primary winding 14 is mounted on the middle core portion, and the secondary windings 16 and 18 are attached to the core portions on both sides. A mounted transformer is known (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 10-70031 JP 2005-39050 A

In a transformer using a conventional square ring type core or EE type core, the parallel portions 2b and 10a on which the windings are mounted are coupled in the plane direction by the right angle portions 2a and 12b. There is a problem in that it increases in the width direction, that is, in the plane direction horizontal to the board, and the occupied area in the plane direction of the transformer on the board increases.
An object of the present invention is to provide a multi-output transformer suitable for miniaturization.
Another object of the present invention is to provide a single-input multiple-output transformer suitable for driving a large number of lighting fixtures with an energizing circuit constituting a single closed loop.

To achieve the above object, the present invention provides two or more I-type cores arranged in parallel at a predetermined interval, and a vertical direction with a predetermined interval on a parallel plane of the I-type core. And a C-type core having convex portions at both ends connected to both ends of the I-type core, and a primary winding attached to each of the I-type cores via a bobbin. A secondary winding is mounted via a bobbin adjacent to both sides of the winding, and the secondary side has at least four winding outputs.
In the present invention, the C-type core is disposed on both sides of the I-type core.
Further, the present invention is characterized in that the C-type core is disposed in each I-type core, and the C-type cores are separated from each other.

According to the present invention, each secondary winding is constituted by a plurality of electric wires arranged in parallel, and the secondary side has at least eight winding outputs.
In the present invention, the end of each secondary winding on the side close to the primary winding is connected to a ground terminal provided on the bobbin.
In the present invention, the winding directions of the secondary windings facing in the parallel direction are opposite to each other, and the winding directions of the primary windings facing the parallel direction are opposite to each other.

According to the present invention, a notch for preventing magnetic field lines from being formed in a direction orthogonal to the longitudinal direction is provided at an end of the C-shaped core in the longitudinal direction.
In the present invention, a primary elongated metal electrode is installed on both sides of the primary winding mounted on each bobbin, and both ends of the primary winding are connected to the metal electrode. A secondary elongated metal electrode is installed adjacent to the primary metal electrode, and the end of the secondary winding on the side close to the primary winding is connected to the metal electrode.
In the present invention, a wiring board is disposed on both sides of the primary winding mounted on each bobbin, and a primary elongated electrode and a secondary elongated electrode are provided on the wiring board. Both ends of the secondary winding were connected to the primary metal electrode, and the end of each secondary winding on the side close to the primary winding was connected to the secondary metal electrode via a resistance element. Is.

Further, the present invention is characterized in that the winding direction of the secondary winding and the primary winding adjacent thereto is the same.
Further, according to the present invention, an I-type core is inserted into each of at least two bobbins connected in parallel, a primary winding is mounted in the middle of each bobbin, and a secondary winding is provided on both sides of the primary winding. A wire is attached, and a C-type core is placed in a direction perpendicular to the parallel plane with a predetermined interval on the parallel plane of the I-type core, and the convex portions at both ends of the C-type core are Connected to both ends of each I-type core, a terminal mounting portion is provided in the high-voltage terminal arrangement region of the bobbin, and a first terminal connected to one end of the secondary winding is a first terminal attachment in the high-voltage terminal arrangement region A second terminal attached to the other end of the secondary winding attached to the bobbin and connected to the other end of the secondary winding, the second terminal attaching portion in the rear low voltage terminal arrangement region having a predetermined distance from the high voltage terminal arrangement region And the second terminal is a ground terminal.

In the present invention, the high-voltage terminal arrangement region is provided near both ends of the I-type core, the low-voltage terminal arrangement region is provided near the center of the I-type core, and the primary winding is provided in the low-voltage terminal arrangement region. And a ground terminal adjacent to the primary terminal.
Further, the present invention is characterized in that the first terminal mounting portions are provided on both ends in the longitudinal direction of the bobbins, and the second terminal mounting portions are provided on both ends in the axial direction of the primary winding. And

  The present invention also provides an I-type core that is inserted and arranged in at least two bobbins connected in parallel, and a vertical interval with respect to the parallel plane at a predetermined interval on the parallel plane of the I-type core. C-type cores that are arranged so as to overlap each other and whose convex portions at both ends are connected to both end portions of each I-type core, and a primary winding that is attached to the middle of each I-type core via a bobbin A secondary winding located on one side of the primary winding and mounted on each I-type core via a bobbin, and a bobbin on the other side of the primary winding. The other side secondary winding mounted on the one side and one side terminal mounting portion having one side high voltage secondary terminal provided on one end side of each bobbin and connected to the winding start end of the one side secondary winding, respectively. , Other provided on the other end side of each bobbin and connected to the winding start end of the other side secondary winding And a second secondary ground terminal provided on the one-side terminal mounting portion, and the one-side secondary winding on the first secondary ground terminal. The winding end of one of the secondary windings is connected, and the winding end of the other secondary winding of the one-side secondary winding is connected to a second secondary ground terminal, Third and fourth secondary ground terminals are provided on the other side terminal mounting portion, and a winding end of one secondary winding of the other side secondary winding is connected to the third secondary ground terminal. The winding end of the other secondary winding of the other secondary winding is connected to the fourth secondary ground terminal.

In the present invention, the winding direction of the one-side secondary winding is mutually the same, and the winding direction of the other-side secondary winding is opposite to the winding direction of the one-side secondary winding, The winding direction of the portion adjacent to the one-side secondary winding of the primary winding is the same as the winding direction of the one-side secondary winding, and the other-side secondary winding of the primary winding And the winding direction of the adjacent part is the same as the winding direction of the other side secondary winding.
According to the present invention, fifth and sixth terminal mounting portions are respectively provided behind the one-side secondary winding, and the first and second secondary ground terminals are provided on the fifth and sixth terminal mounting portions, respectively. A winding end of one secondary winding of the one-side secondary winding is connected to a first secondary ground terminal, and the one-side secondary winding is connected to a second secondary ground terminal. A winding end of the other secondary winding is connected, and the seventh and eighth terminal mounting portions are respectively provided at the rear of the other secondary winding, and the seventh and eighth side terminal mounting portions are provided. Are provided with third and fourth secondary ground terminals, the third secondary ground terminal is connected to the winding end of one of the other secondary windings, and the second 2 The winding end of the other secondary winding of the other secondary winding is connected to the next ground terminal.

In the present invention, the winding start end of one part and the winding start end of the other part are connected in series among the two different winding directions of the primary winding. The winding end and the winding end of the other part are used as a primary input unit.
In the present invention, the first secondary ground terminal and the third secondary ground terminal are connected in series, and the second secondary ground terminal and the fourth secondary ground terminal are connected in series. It is connected.
In the present invention, the high-voltage secondary terminal of the one-side terminal mounting portion is connected to one connector having a pair of terminals for lamp connection, and the high-voltage secondary terminal of the other-side terminal mounting portion is connected to the lamp. Are connected to another connector having a pair of terminals.

  By configuring the present invention as described above, the primary winding and the secondary winding can be tightly coupled, and an efficient transformer suitable for multiple outputs and miniaturization can be provided. The present invention can also provide a transformer suitable for driving a large number of lighting fixtures on an energization circuit composed of a single closed loop.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a bottom view of the transformer. In the figure, reference numerals 20 and 22 denote cylindrical bobbins arranged in parallel to each other, and terminal mounting portions 24, 26, 28, and 30 are integrally formed at both ends in the longitudinal direction. I-type cores 40 and 42 shown in FIG. 3 are inserted into the bobbins 20 and 22, respectively. Reference numeral 44 denotes a C-shaped core composed of a flat plate portion and convex portions projecting perpendicularly at both ends in the longitudinal direction thereof, and is disposed so as to face the arrangement plane of the two I-shaped cores 40 and 42 in the vertical direction. One convex surface 44a of the C-type core 44 is in contact with and bonded to one of the two I-type cores via a notch 46 formed in the terminal mounting portions 30 and 26. . The other-end convex surface 44b of the C-type core 44 is applied to each other of the two I-type cores 40 and 42 through the notch 48 formed in the terminal mounting portions 28 and 24. It is in contact and bonded.

A secondary winding 50 is wound between the terminal mounting portions 24 and 32 of the bobbin 20, and a secondary winding 52 is wound between the terminal mounting portions 34 and 26. And 34 is wound with a primary winding 54. A secondary winding 56 is wound between the terminal mounting portions 28 and 36 of the bobbin 22, and a secondary winding 58 is wound between the terminal mounting portions 38 and 30. A primary winding 60 is wound between 36 and 38. In the drawing, an arrow attached to each winding of this embodiment and other embodiments described later indicates a winding direction with reference to the winding start end of the winding.
Between the terminal mounting portions 24 and 32 of the bobbins 20 and 22, between the terminal mounting portions 34 and 26, between the terminal mounting portions 28 and 36, and between the terminal mounting portions 38 and 30, respectively. A plurality of insulating partitions 62 are provided. The winding start ends 50a, 52a, 56a, and 58a of the secondary windings 50, 52, 56, and 58 are connected to the secondary side terminals 64, 66, 68, and 70 through the grooves of the terminal mounting portions, respectively, and the winding ends. The ends are connected to the secondary terminals 72, 74, 76, and 78 through lead wires 50b, 52b, 56b, and 58b, respectively.

Both ends of the primary winding 54 are connected to primary side terminals 80 and 82, and both ends of the primary winding 60 are connected to primary side terminals 84 and 86. The primary side terminals 86 and 80 are connected in series via lead wires, and the primary side terminals 84 and 82 constitute an input terminal. The primary terminals 84 and 80 may be connected via lead wires, the primary terminals 82 and 86 may be connected via lead wires, and the primary windings 54 and 60 may be connected in parallel. .
In the configuration described above, the transformer is mounted on a printed circuit board, and the AC signal output side of the inverter circuit is connected to the primary side input terminals 82 and 84 of the transformer.
Between the secondary side terminals 64 and 66, lamps L 1 and L 2 such as cold cathode fluorescent lamps connected in series are connected via a connector (not shown), and between the secondary side terminals 68 and 70. Similarly, lamps L3 and L4 such as cold cathode fluorescent lamps are connected via a connector. The ends of the secondary windings 50, 52, 56, 58 close to the primary windings 54, 60 are grounded through the secondary terminals 72, 74 and 76, 78, respectively. The secondary side terminals 72, 74 and 76, 78 constitute a ground terminal, and the ground terminal is grounded via a high resistance element.

When an AC signal is input to the primary windings 54 and 60, magnetic paths are formed in the two I-shaped cores 40 and 42 arranged in parallel, and high voltages are applied to the secondary windings 50, 52, 56, and 58. AC output voltage is generated. The direction of the magnetic flux formed in the I-type cores 40 and 42 is the same. The winding directions of the secondary windings 50 and 52 are set in opposite directions as indicated by the arrow directions in the figure, and the terminals 64 and 66 are in opposite phases. Similarly, the high-voltage secondary terminals 68 and 70 are also in opposite phases. Therefore, when the terminals 64 and 68 are positive, the terminals 66 and 70 are negative.

FIG. 5 shows another embodiment of the present invention, in which the secondary windings 50 and 56 are wound in opposite directions, and the secondary terminals 64 and 68 are in opposite phases. The secondary windings 52 and 58 are wound in opposite directions, and the secondary terminals 66 and 70 are in opposite phases. Therefore, when the terminals 68 and 66 are positive, the terminals 64 and 70 are negative. The lamps L1 and L2 connected in series with each other are connected via a connector between the secondary side terminals 64 and 68, and the lamps L3 and L4 connected in series with each other have a connector between the secondary side terminals 66 and 70. Connected through. Other configurations are the same as those of the embodiment shown in FIG.
FIG. 6 shows another embodiment of the present invention. Secondary windings 50 and 52 are wound around the bobbin 20 in the same direction, and secondary windings 56 and 58 are wound around the other bobbin 22 in the same direction. It is wound. Therefore, when the terminals 64 and 68 are positive, the terminals 66 and 70 are also positive. One electrode of each of the lamps L1, L2, L3, and L4 is connected to the secondary side terminals 64, 68, 66, and 70 through a connector as shown in the figure, and the other electrode of each of the lamps L1, L2, L3, and L4 is connected. Is grounded. The portions adjacent to the secondary windings 50, 52, 56, 58 of the primary windings 54, 60 are as shown in FIG. The same clockwise direction. In this way, by making the winding direction of the adjacent portions of the primary winding and the secondary winding the same, the magnetic collision that occurs transiently when the power switch is turned off, that is, Interference of magnetic field lines can be eliminated. Other configurations are the same as those of the embodiment shown in FIG.

FIG. 7 shows another embodiment of the present invention. Secondary terminal 72 is provided on each of terminal mounting portions 32 and 34 provided on both ends in the axial direction of primary winding 54 mounted on bobbin 20. , 74, and secondary terminal 76, 78 are provided on each of the terminal mounting portions 36, 38 provided on both ends in the axial direction of the primary winding 60 mounted on the bobbin 22. The winding end ends 50b and 52b of the secondary windings 50 and 52 are respectively connected to the corresponding secondary terminals 72 and 74, and the winding end ends 56b and 58b of the secondary windings 56 and 58 are respectively corresponding. The secondary side terminals 76 and 78 are connected.
The secondary side terminals 72, 74, 76, 78 are grounded via lead wires to constitute secondary side ground terminals. Reference numerals 88 and 90 denote connectors attached to a printed circuit board (not shown), to which lamps (not shown) installed on the board (not shown) are connected as shown in FIG. The connector 88 is connected to the secondary side terminals 64 and 68 via lead wires 92 and 94, and the connector 90 is connected to the secondary side terminals 66 and 70 via lead wires 98 and 96. Other configurations are the same as those of the embodiment shown in FIG.

In the above-described configuration, the transformer is located behind the high-voltage terminal arrangement areas 100 and 102 with respect to the connectors 88 and 90 and the high-voltage terminal arrangement areas 100 and 102 facing the connectors 88 and 90 in the shortest distance. It is divided into a low voltage terminal arrangement region 104 located. As a result, the low-voltage secondary terminals 72, 74, 76, 78 do not enter the high-voltage regions 100, 102, and the secondary-side terminals 68, 76 are connected between the secondary-side terminals 64, 72. Insulation distance between the secondary terminals 66 and 74 and between the secondary terminals 70 and 78 is increased, and discharge and the like between them can be prevented, and the transformer can be driven safely. it can.

As shown in FIG. 4B, the coupling structure of the I-type core and the C-type core is such that two C-type cores 44 and 44 'are arranged on both the upper and lower sides of the I-type cores 40 and 42. The convex portions at both ends of 44 and 44 ′ may be bonded to the I-type core 40 to form a closed magnetic circuit. In the configuration of FIG. 4B, the space between the windings attached to the I-type cores 40 and 42 via the bobbin and the printed circuit board to which the transformer is attached is magnetically shielded by the C-type core 44 ′, and the electrical The insulation effect can be enhanced. Further, the C-type core may be a single C-type core obtained by combining the L-type core and the I-type core. The secondary windings 50, 52, 56, and 58 may be so-called bifilar windings in which two or more coil wires are wound in parallel to obtain multiple outputs.
Next, another embodiment of the present invention will be described with reference to FIG.

  FIG. 8 shows a bottom view of the transformer. A primary winding 54 is wound around the two bobbins 20 and 22 between the terminal mounting portions 32 and 34 and between the terminal mounting portions 36 and 38. The primary winding 54 is divided into two portions 54a and 54b that are in an opposite relationship to each other. Of the portions 54 a and 54 b of the two primary windings 54, the winding start end (S) of the portion 54 a adjacent to the secondary windings 50 and 56 is connected to the primary side terminal 80 of the terminal mounting portion 32. The winding end (E) is connected to the primary terminal 84 of the terminal mounting portion 36. Among the portions 54a and 54b, the winding start end (S) of the portion 54b adjacent to the secondary windings 52 and 58 is connected to the primary terminal 86 of the terminal mounting portion 38, and the winding end end (E) is It is connected to the primary side terminal 82 of the terminal mounting portion 34.

The portion 54a of the primary winding 54 is wound clockwise as indicated by an arrow with reference to the winding start end (S) in FIG. 8, and the portion 54b is referenced to the winding start end (S). It is wound in the counterclockwise direction. The secondary winding 50 has a winding start end 50 a connected to a high voltage secondary terminal 64 disposed at an outer end of the terminal mounting portion 24. The winding end 50 b of the secondary winding 50 is returned to the terminal mounting portion 24 along the peripheral surface of the secondary winding 50 and connected to the secondary side ground terminal 72 disposed inside the terminal mounting portion 24. Yes. The secondary winding 52 has a winding start end 52 a connected to a high voltage secondary terminal 66 disposed at the outer end of the terminal mounting portion 26, and a winding end 52 b of the secondary winding 52 around the secondary winding 52. It is returned to the terminal mounting portion 26 along the surface and connected to a secondary ground terminal 74 disposed inside the terminal mounting portion 26.

The secondary winding 56 has a winding start end 56 a connected to a high-voltage secondary terminal 68 disposed at the outer end of the terminal mounting portion 28, and a winding end 56 b of the secondary winding 56. It returns to the terminal attachment part 28 along the peripheral surface, and is connected to a secondary ground terminal 76 disposed inside the terminal attachment part 28. The secondary winding 58 has a winding start end 58 b connected to a high voltage secondary terminal 70 disposed at an outer end of the terminal mounting portion 30, and a winding end 58 b of the secondary winding 58. It returns to the terminal attachment part 30 along the peripheral surface, and is connected to the secondary ground terminal 78 disposed inside the terminal attachment part 30. The primary side terminal 80 and the primary side terminal 86 are connected in series via a lead wire 81. The primary side terminals 84 and 82 constitute a primary input unit. The secondary windings 50 and 56 on the bobbins 20 and 22 are wound in the clockwise direction with the winding start ends 50a and 56a as a reference in FIG. The secondary windings 52 and 58 are wound in the counterclockwise direction with the winding start ends 52a and 58a as a reference, and are in phase with each other. In this way, the secondary windings 50 and 56 are clockwise and the secondary windings 52 and 58 are counterclockwise and are in opposite phase to each other. Due to this winding direction, when the secondary terminals 64 and 68 are positive, the secondary terminals 66 and 70 are negative.

The portion 54a adjacent to the secondary windings 50, 56 of the primary winding 54 is in the same clockwise direction as the secondary windings 50, 56 with respect to the winding start end as a reference. When the winding start end S is used as a reference, the portion 54b adjacent to the pins 52 and 58 has the same counterclockwise direction as the secondary windings 52 and 58. In this way, by making the winding direction of the adjacent portions of the primary winding and the secondary winding the same, the magnetic collision that occurs transiently when the power switch is turned off, that is, Interference of magnetic field lines can be eliminated. Other configurations of the present embodiment are the same as the configurations of the embodiment shown in FIG. 1, and corresponding portions are denoted by the same reference numerals.
In the above configuration, the transformer T is mounted on a printed circuit board, and the AC signal output side of the inverter circuit is connected to the primary side terminals 84 and 82 of the transformer T, and this AC signal is connected to the primary side terminal 84. , 82. Corresponding to the transformer T, the connectors CN1 and CN2 for lamp connection are fixedly arranged on the printed circuit board. Among the pair of terminals A and B of the connector CN1, one terminal A is connected to a high voltage secondary terminal 64 via a ballast capacitor, and the other terminal B is connected to a high voltage 2 via a ballast capacitor. A secondary terminal 68 is connected.

Further, among the pair of terminals of the connector CN2, one terminal C is connected to a high-voltage secondary terminal 70 via a ballast capacitor, and the other terminal D is connected to a high-voltage secondary terminal via a ballast capacitor. A side terminal 66 is connected. Also, the secondary secondary ground terminals 72 and 74 are connected in series via lead wires, and the secondary secondary ground terminals 76 and 78 are similarly connected in series via lead wires. Each is grounded via a high resistance element, for example, a resistance R1, R2 (see FIG. 9) of 1 megaΩ.
FIG. 9 shows the relationship between the secondary windings 50, 52, 56, and 58 of the transformer T with one input and four winding outputs, and the connectors CN1 and CN2. The terminals A and B of the connector CN1 are in phase with each other, and the terminals C and D of the connector CN2 are in reverse phase with respect to the terminals A and B. That is, when the terminals A and B are positive, the terminals C and D are negative. The secondary windings 50 and 52 and the secondary windings 56 and 58 are connected in series by lead wires.

With the above configuration, one or a plurality of one-input four-winding output transformers are arranged on a printed circuit board, and lamps arranged with respect to connector terminals corresponding to each transformer are arranged from one closed loop. It becomes possible to drive efficiently with the energization circuit. An embodiment in which four transformers are used to drive 16 lamps such as a cold cathode fluorescent lamp will be described below with reference to FIG.
Four transformers T are arranged in one row on the printed circuit board 12, and a pair of connectors CN1 and CN2 are arranged in one row corresponding to each transformer T. Each transformer T and a pair of connectors CN1 and CN2 corresponding thereto are connected as shown in FIG. Further, on the lamp support substrate (not shown), two lamps are arranged in a line so as to be parallel to each other with respect to one connector. One electrode of the total 16 lamps L1 to L16 is connected to the terminal of the corresponding connector via a lead wire.
In FIG. 10, the other electrode of the first lamp L1 from the top is connected to the other electrode of the second lamp L15 from the bottom, and the other electrode of the second lamp L2 from the top is the first electrode from the bottom. Connected to the other electrode of the lamp L16. The other electrodes of the other intermediate lamps L3 to L14 are connected to the other electrode of the lamp connected to the opposite phase terminal sequentially from the top in FIG.

The energization circuit of the lamps L1 to L16 connected as described above is, for example, when one electrode S of the lamp L1 is a starting point, the electrode S, the lamp L15, the connector CN2, the windings 58 and 56 of the transformer T, Connector CN1, lamp L14, lamp L11, connector CN2, windings 58 and 56 of transformer T, connector CN1, lamp L10, lamp L7, connector CN2, windings 58 and 56 of transformer T, connector CN1, lamp L6, Lamp L3, connector CN2, transformer T windings 58 and 56, connector CN1, lamp L2, lamp L16, connector CN2, transformer T windings 52 and 50, connector CN1, lamp L13, lamp L12, connector CN2, Windings 52, 50 of transformer T, connector CN1, lamp L9, lamp L8, connector CN2, winding 52 of transformer T, 0, connector CN1, lamp L5, lamps L4, connector CN2, windings of the transformer T 52, 50, via the electrode E of the connector CN1 and lamp L1, to form one closed loop back to the start point S.
As described above, by making the energization circuit of the lamp one closed loop, it is possible to light all the lamps with uniform brightness.

In the lamp connection configuration, a pair of lamps L1, L15, L2, L16, L3, L6, L4, L5, L7, L10, L8, and L9 connected in series are connected to the opposite phases of the transformer T. A voltage is applied and each pair of lamps is driven at high pressure. Further, in FIG. 8, the primary winding 54 is not limited to the configuration in which the primary winding 54 is wound across the bobbins 20 and 22, and may be wound for each of the bobbins 20 and 22. In this case, four primary windings 54 are formed. Further, the present invention is not limited to the configuration of two I-type cores, and a plurality of I-type cores such as three, four, etc. are arranged in parallel and connected by a C-type core. May be.
FIG. 11 shows another embodiment of the present invention, in which secondary ground terminals are respectively connected to terminal mounting portions 32 and 34 provided on both ends in the axial direction of the primary winding 54 mounted on the bobbin 20. 72 and 74, and secondary ground terminals 76 and 78 are provided on the terminal attachment portions 36 and 38 provided on both ends in the axial direction of the primary winding 54 attached to the bobbin 22. The winding end ends 50b and 52b of the secondary windings 50 and 52 are respectively connected to the corresponding secondary terminals 72 and 74, and the winding end ends 56b and 58b of the secondary windings 56 and 58 are respectively corresponding. The secondary side ground terminals 76 and 78 are connected.

The secondary ground terminals 72 and 74 are connected in series by a lead wire, and the lead wire is grounded through a high resistance element. The secondary ground terminals 76 and 78 are connected in series by a lead wire, and the lead wire is grounded through a high resistance element. CN1 and CN2 are connectors attached to a printed circuit board (not shown), to which lamps (not shown) installed on the board (not shown) are connected as shown in FIG. The connector CN1 is connected to the secondary side terminals 64, 68 via lead wires 92, 94, and the connector CN2 is connected to the secondary side terminals 66, 70 via lead wires 98, 96. Other configurations are the same as those of the embodiment shown in FIG.

In the configuration described above, the transformer is located behind the high-voltage terminal arrangement regions 100 and 102 facing the connectors CN1 and CN2 at the shortest distance and the high-voltage terminal arrangement regions 100 and 102 with respect to the connectors CN1 and CN2. It is divided into a low voltage terminal arrangement region 104 located. Accordingly, the low-voltage secondary ground terminals 72, 74, 76, and 78 do not enter the high-voltage regions 100 and 102, and the secondary-side terminal 68 is interposed between the secondary-side terminal 64 and the secondary ground terminal 72. Between the secondary terminal 66 and the secondary ground terminal 76, and between the secondary terminal 66 and the secondary ground terminal 74 and between the secondary terminal 70 and the secondary ground terminal 78 are increased. The discharge can be prevented and the transformer can be driven safely.
FIG. 12 shows another embodiment of the present invention.

The secondary winding 50 is wound clockwise as indicated by an arrow in the drawing with the winding start end 50a as a reference, and the secondary winding 56 facing in parallel with the secondary winding 50 has its winding start end 56a at the winding start end 56a. As a reference, the winding is wound counterclockwise and the secondary windings 50 and 56 are wound in opposite directions. Similarly, in the secondary windings 52 and 58, the secondary winding 52 is left-handed and the secondary winding 58 is right-handed, and the winding directions are opposite to each other. Similarly, the primary windings 54 and 60 are rotated clockwise with respect to the winding start end, and the primary winding 60 is counterclockwise and counterclockwise. Thus, by reversing the winding direction of the windings facing each other in the parallel direction, vibration due to the magnetic force of the windings can be canceled and heat generation of the transformer can be prevented. The primary windings 54 and 60 are connected in parallel or in series. The outputs of the secondary high voltage terminals 64 and 68 are in phase with each other, and the secondary high voltage terminals 66 and 70 are out of phase with respect to the secondary high voltage terminals 64 and 68. That is, when the secondary terminals 64 and 68 are positive, the secondary terminals 66 and 70 are negative. The winding end ends 50b, 56b, 52b, and 58b of the secondary terminals 50, 56, 52, and 58 are connected to ground terminals 72, 76, 74, and 78, respectively. The other structure of this embodiment is the same as that of the transformer shown in FIG.

FIG. 13 shows an embodiment in which the primary winding 54 is wound around the bobbins 20 and 22 in the same direction across the two I-core bobbins 20 and 22. That is, the primary winding 54 is not particularly limited to a configuration wound in the reverse direction as shown in FIG. FIG. 14 shows an arrow direction magnetic flux F formed in a direction perpendicular to the longitudinal direction of the C-type core 44 shown in FIG. 14A at both ends of the C-type core 44 extending over a plurality of I-type cores. The countermeasures are shown. As a countermeasure against this, in the embodiment shown in FIG. 14B, in order to eliminate the magnetic flux F, notches (S) are provided at both ends of the flat plate portion 44c of the C-type core.

In each of the above embodiments, a single C-type core is coupled to a plurality of I-type cores. However, as shown in FIG. One C-type core 44 may be coupled.
FIG. 16 shows an embodiment in which a C-type core 44 is coupled to three or more I-type cores 43. The secondary side terminal 65 is attached to the terminal attaching part 24 of the bobbin 21 in which each I-type core 43 is stored, and the winding start end of the secondary winding attached to the bobbin 21 is connected thereto. As shown in FIG. 17, lead wires of the primary winding 55 are guided to the insulating partition 23, and each lead wire is connected to an elongated metal electrode 110 that is installed on the bobbin 21. The metal electrode 110 is connected to a primary terminal 112 attached to the partition 23. The winding end of each secondary winding, that is, the side close to the primary winding of each secondary winding is also connected to a secondary metal electrode (not shown) via a lead wire in the same configuration as described above. The The secondary metal electrode is installed on the bobbin 21 adjacent to the partition 23.

FIG. 18 is a schematic explanatory view of an embodiment using three or more I-type cores, and shows the bottom surface of the transformer. A wiring board such as a printed circuit board 116 is disposed and fixed at the boundary between the primary winding 55 and the secondary winding 114 mounted on the bobbin 21 in which each I-type core is stored. The lead wire at the end of each primary winding 55 is connected to the elongated metal electrode 120. Primary terminals 118 are connected to both ends of the elongated metal electrode 120. The lead wire at the winding end of the secondary winding 114 is connected to an elongated metal electrode 126 to which the ground terminals 124 are connected via an electronic component 122 such as a chip resistor.
1, 5, 6, 7, 8, 11, and 12, each of the transformers T shown in FIGS. 1, 5, 6, 7, 8, 11, and 12 is an end of the secondary winding that is closer to the primary winding. Is connected to the ground terminal. With this configuration, the potential difference between the primary winding and the secondary winding can be reduced, safety can be improved, and the primary winding and the secondary winding can be closely coupled.

It is a bottom view of the transformer concerning the present invention. It is a side view of a transformer. It is an external view of a core. It is explanatory drawing of this invention. It is a bottom view which shows other embodiment of this invention. It is a bottom view which shows other embodiment of this invention. It is a bottom view which shows other embodiment of this invention. It is a bottom view of other embodiments of the present invention. It is circuit explanatory drawing of this invention. It is circuit explanatory drawing of this invention. It is a bottom view which shows other embodiment of this invention. It is a bottom view which shows other embodiment of this invention. It is explanatory drawing of this invention. It is external appearance explanatory drawing of other embodiment of this invention. It is external appearance explanatory drawing of other embodiment of this invention. It is external appearance explanatory drawing of other embodiment of this invention. It is a bottom face appearance explanatory view of other embodiments of the present invention. It is a bottom face appearance explanatory view of other embodiments of the present invention. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

Explanation of symbols

2 core
4 Primary winding
8 Secondary Winding 10 Core 12 Core 14 Primary Winding 16 Secondary Winding 18 Secondary Winding 20 Bobbin 21 Bobbin 22 Bobbin 23 Partition 24 Terminal Mounting Portion 26 Terminal Mounting Portion 28 Terminal Mounting Portion 30 Terminal Mounting Portion 32 Terminal Attachment portion 34 Terminal attachment portion 36 Terminal attachment portion 38 Terminal attachment portion 40 Core 42 Core 44 Core 46 Notch portion 48 Notch portion 50 Secondary winding 52 Secondary winding 54 Primary winding 55 Primary winding 56 2 Secondary winding 58 Secondary winding 60 Primary winding 62 Partition 64 Secondary terminal 65 Secondary terminal 66 Secondary terminal 68 Secondary terminal 70 Secondary terminal 72 Secondary terminal 74 Secondary terminal 76 Secondary side terminal 78 Secondary side terminal 80 Primary side terminal 82 Primary side terminal 84 Primary side terminal 86 Primary side terminal 88 Connector 90 Connector 92 Lead wire 94 Lead wire 96 Lead wire 98 Lead wire 1 0 high voltage terminal arrangement region 102 the high voltage terminal arrangement region 104 the low pressure port arrangement region 110 metal electrodes 112 primary terminal 114 secondary winding 116 printed board 118 primary terminal 120 metal electrodes 122 electronic component 124 ground terminal 126 metal electrodes

Claims (19)

Two or more I-type cores arranged in parallel at a predetermined interval, and convex portions at both ends arranged in a vertical direction with a predetermined interval on a parallel plane of the I-type core A C-type core connected to both ends of the I-type core, and a primary winding is mounted on each of the I-type cores via a bobbin, and the bobbin is adjacent to both sides of the primary winding. A transformer characterized in that a secondary winding is mounted through the secondary side and at least four windings are output on the secondary side. The transformer according to claim 1, wherein the C-type core is disposed on both sides of the I-type core. The transformer according to claim 1, wherein the C-type core is disposed in each of the I-type cores, and the C-type cores are separated from each other. 2. The transformer according to claim 1, wherein each secondary winding is constituted by a plurality of electric wires arranged in parallel, and the secondary side has at least eight winding outputs. 2. The transformer according to claim 1, wherein an end of each of the secondary windings on the side close to the primary winding is connected to a ground terminal provided on the bobbin. 2. The winding direction of the secondary winding opposed to the parallel direction is opposite to each other, and the winding direction of the primary winding opposed to the parallel direction is opposite to each other. Transformer. 2. The transformer according to claim 1, wherein a notch for preventing magnetic field lines from being formed in a direction orthogonal to the longitudinal direction is provided at an end of the C-shaped core in the longitudinal direction. A primary elongated metal electrode is installed on both sides of the primary winding mounted on each bobbin, both ends of the primary winding are connected to the metal electrode, and the primary metal electrode is connected to each bobbin. 2. An elongated metal electrode for secondary use is installed adjacent to the end of the secondary winding, and the end of the secondary winding on the side close to the primary winding is connected to the metal electrode. The described transformer. A wiring board is arranged on both sides of the primary winding mounted on each bobbin, a primary elongated electrode and a secondary elongated electrode are provided on the wiring board, and both ends of each primary winding are provided. Is connected to the primary metal electrode, and the end of each secondary winding on the side close to the primary winding is connected to the secondary metal electrode via a resistance element. The transformer according to claim 1. The transformer according to claim 1, wherein a winding direction of the secondary winding and the primary winding adjacent thereto is the same. Insert an I-type core into each of at least two bobbins connected in parallel, attach a primary winding in the middle of each bobbin, and attach secondary windings on both sides of the primary winding; A C-type core is disposed in a direction perpendicular to the parallel plane with a predetermined interval on the parallel plane of the I-type core, and convex portions at both ends of the C-type core are formed on the I-type cores. Connected to both ends, a terminal mounting portion is provided in the high voltage terminal arrangement region of the bobbin, and a first terminal connected to one end of the secondary winding is attached to the first terminal mounting portion of the high voltage terminal arrangement region. A second terminal connected to the other end of the secondary winding attached to the second high voltage terminal arrangement region is attached to a second terminal attachment portion in the rear low voltage terminal arrangement region at a predetermined distance from the high voltage terminal arrangement region; A transformer characterized in that terminal 2 is a ground terminal. The high-voltage terminal arrangement region is provided near both ends of the I-type core, the low-voltage terminal arrangement region is provided near the center of the I-type core, and a primary terminal connected to the primary winding in the low-voltage terminal arrangement region The transformer according to claim 11, wherein the ground terminal is disposed adjacent to the primary terminal. 12. The first terminal mounting portion is provided at both ends in the longitudinal direction of each bobbin, and the second terminal mounting portion is provided at both ends in the axial direction of the primary winding. Transformer described in. I-type cores inserted and arranged in at least two bobbins connected in parallel, and overlapped in a direction perpendicular to the parallel plane with a predetermined interval on the parallel plane of the I-type core A C-type core disposed at both ends of which are connected to both ends of each I-type core, a primary winding mounted via a bobbin in the middle of each I-type core, and the primary One side secondary winding located on one side of the winding and attached to each of the I-type cores via a bobbin, and the other side attached to the other side of the primary winding via a bobbin A side secondary winding, a one-side terminal mounting portion having one side high-voltage secondary terminal provided on one end side of each bobbin and connected to the winding start end of the one-side secondary winding, The other side secondary terminal provided on the other end side and connected to the winding start end of the other side secondary winding The first side ground terminal is provided with first and second secondary ground terminals, and the first secondary ground terminal is provided with one of the second side secondary windings. The winding end of the secondary winding is connected, the winding end of the other secondary winding of the one-side secondary winding is connected to the second secondary ground terminal, and the other-side terminal mounting portion Are provided with third and fourth secondary ground terminals, the third secondary ground terminal is connected to the winding end of one of the other secondary windings, and the second 2 A transformer characterized in that the winding end of the other secondary winding of the other secondary winding is connected to the next ground terminal. The winding direction of the one-side secondary winding is the same, the winding direction of the other-side secondary winding is opposite to the winding direction of the one-side secondary winding, and the primary winding The winding direction of the portion adjacent to the one-side secondary winding is the same as the winding direction of the one-side secondary winding, and the portion of the primary winding adjacent to the other-side secondary winding The transformer according to claim 14, wherein the winding direction is the same as the winding direction of the other-side secondary winding. Fifth and sixth terminal mounting portions are respectively provided behind the one-side secondary windings, and first and second secondary ground terminals are provided on the fifth and sixth terminal mounting portions, respectively. The winding end of one secondary winding in the one-side secondary winding is connected to the secondary ground terminal, and the other two of the one-side secondary windings are connected to the second secondary ground terminal. The winding end of the next winding is connected, and the seventh and eighth terminal mounting portions are respectively provided behind the other secondary winding, and the third and eighth terminal mounting portions are respectively provided on the seventh and eighth side terminal mounting portions. 4 secondary ground terminals, a winding end of one secondary winding of the other secondary winding is connected to a third secondary ground terminal, and the secondary secondary ground terminal is connected to the fourth secondary ground terminal. The transformer according to claim 14, wherein the winding end of the other secondary winding in the other secondary winding is connected. The winding start end of one part and the winding start end of the other part are connected in series among the two mutually different winding directions of the primary winding, and the winding end end of the one part and the other The transformer according to claim 15, wherein a winding end of the portion is a primary input unit. The first secondary ground terminal and the third secondary ground terminal are connected in series, and the second secondary ground terminal and the fourth secondary ground terminal are connected in series. The transformer according to claim 14. The high-voltage secondary terminal of the one-side terminal mounting portion is connected to one connector having a pair of terminals for lamp connection, and the high-voltage secondary terminal of the other-side terminal mounting portion is connected to the pair of terminals for lamp connection. The transformer according to claim 14, wherein the transformer is connected to the other connector.

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