JP2010093153A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer which has a small radiation amount of electromagnetic noise. <P>SOLUTION: The transformer has a core 4 made of a magnetic body. Further, the transformer has a primary coil 10 having a primary winding portion 11 wound around the core 4 a plurality of times, and primary-side terminals 12 led out of both ends of the primary winding portion 11. Further, the transformer has, on one side in the axial direction of the primary coil 10, a secondary coil 20 having a secondary winding portion 21 disposed concentrically with the primary coil 10, wound around the core 4, and formed in a flat plate shape of one turn, and secondary-side terminals 22 led out of both ends of the primary winding portion 21. The whole primary winding portion 11 is configured to overlap the secondary winding portion 21 in the axial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transformer that emits less electromagnetic noise.

  2. Description of the Related Art Conventionally, a transformer that is used in a DC-DC converter and boosts or lowers a voltage is known. For example, as shown in FIGS. 11 and 12, a transformer 90 including a primary coil 94 having a plurality of windings, a copper coil secondary coil 95 called a bus bar, and cores 91, 92, 93 made of a magnetic material is known. It has been.

JP-A-10-289826 JP 2003-272929 A

  However, as shown in FIG. 12, the transformer 90 has a region 96 where the primary coil 94 and the secondary coil 95 do not overlap with each other. When there is a lot of electromagnetic noise, problems such as malfunction of a control circuit board, a filter circuit, or other equipment provided around the transformer 90 occur. Therefore, a transformer that emits less electromagnetic noise is desired.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a transformer with a small amount of electromagnetic noise emission.

The first invention comprises a core made of a magnetic material,
A primary coil having a primary winding wound around the core a plurality of times, and primary terminals drawn from both ends of the primary winding;
A secondary winding portion disposed concentrically with the primary coil on one side in the axial direction of the primary coil, wound around the core and formed into a flat plate shape of one turn, and the secondary winding portion A secondary coil having a secondary side terminal drawn from both ends of
The transformer is characterized in that all parts of the primary winding part are configured to overlap with the secondary winding part in the axial direction (Claim 1).

Next, the function and effect of the first invention will be described.
In the first invention, since all parts of the primary winding portion are configured to overlap the secondary winding portion in the axial direction, the radiation amount of electromagnetic noise can be reduced.
That is, as shown in FIGS. 11 and 12, the conventional transformer 90 has a region 96 where the primary coil 94 and the secondary coil 95 do not overlap, and a large amount of electromagnetic noise is radiated from this region 96. In the present invention, such a region 96 does not exist, and all portions of the primary winding portion are covered with the secondary winding, so that the radiation amount of electromagnetic noise is reduced.

  More specifically, as shown in FIG. 12, if the current flowing through the primary coil 94 is ip, the number of turns is n, the current flowing from the terminal 97 of the secondary coil 95 to 98 is is, and the primary excitation current of the transformer 90 is im. , Is≈n (−im + ip). The magnetic field radiation from the portion where the primary coil 94 and the secondary coil 95 overlap is proportional to n × im (= is−n × ip), and the magnetic field radiation from the non-overlapping portion 96 is n × ip. Proportional. Usually, since ip> im is satisfied, electromagnetic wave radiation can be significantly reduced by eliminating the non-overlapping portion 96.

  As described above, according to the first invention, it is possible to provide a transformer that emits less electromagnetic noise.

The second invention is a core made of a magnetic material,
A primary coil having a primary winding wound around the core a plurality of times, and a primary side terminal drawn from both ends of the primary winding;
A secondary winding portion disposed concentrically with the primary coil on one side in the axial direction of the primary coil, wound around the core and formed into a flat plate shape of one turn, and the secondary winding portion A secondary coil having a secondary terminal drawn from both ends of
The both ends of the secondary winding part are adjacent in the circumferential direction with a predetermined gap therebetween, and the length of the gap in the circumferential direction is 10% or less of the inner circumference of the secondary winding part. The transformer is characterized in that all parts of the primary winding portion are configured to overlap the secondary winding portion in the axial direction except for a region corresponding to the gap. ).

  Next, the function and effect of the second invention will be described. According to the second invention, although a gap is formed between both ends of the secondary winding portion, since this gap is narrow, the amount of radiation can be reduced, and only an amount of electromagnetic noise that does not cause a problem is radiated. .

A preferred embodiment of the present invention described above will be described.
In the first invention (invention 1), the secondary terminal is drawn from the secondary side first terminal drawn from one end of the secondary winding part and the other end of the secondary winding part. Preferably, the secondary side first terminal and the secondary side second terminal are configured to overlap each other in the axial direction of the secondary winding portion. (Claim 2).

  In this case, since the secondary side first terminal and the secondary side second terminal are overlapped in the axial direction, there is no gap between these terminals. Thereby, all the portions of the primary winding portion can be surely overlapped with the secondary winding portion, and the radiation amount of electromagnetic noise can be reduced.

The secondary coil is configured by superimposing a first bus bar and a second bus bar made of a metal plate, and the first bus bar includes one half-circumferential portion of the secondary winding portion and the secondary side. A first terminal and a first connection part for connecting to the second bus bar, the second bus bar, the other half-circumferential part of the secondary winding part, the secondary side second terminal, A second connecting portion for connecting to the first bus bar, wherein the first connecting portion and the second connecting portion are fixed while maintaining conductivity while overlapping in the axial direction, and the secondary side first terminal It is preferable that the secondary side second terminal and the secondary side second terminal are arranged so as to overlap each other in the axial direction in a state in which a short circuit is prevented.
In this case, a secondary coil having a structure in which the secondary side first terminal and the secondary side second terminal overlap in the axial direction in a state in which a short circuit is prevented can be easily obtained by using two bus bars. Can be manufactured.

In the second invention (invention 4), the secondary terminal is connected to the secondary first terminal drawn from one end of the secondary winding part and the other end of the secondary winding part. The secondary side first terminal and the secondary side second terminal are erected in the axial direction from both ends of the secondary winding portion, and in the circumferential direction. Preferably, they are adjacent to each other so as to sandwich the gap.
In this case, a thin insulator such as insulating paper can be sandwiched between the secondary side first terminal and the secondary side second terminal. Thereby, the gap between the terminals can be narrowed while preventing a short circuit between these terminals.

The secondary coil is configured by superimposing a first bus bar and a second bus bar made of a metal plate, and the first bus bar includes one half-circumferential portion of the secondary winding portion and the secondary side. A first terminal and a first connection part for connecting to the second bus bar, the second bus bar, the other half-circumferential part of the secondary winding part, the secondary side second terminal, A second connecting portion for connecting to the first bus bar, wherein the secondary side first terminal and the first connecting portion are erected in an axial direction from the half-circumferential portion of the first bus bar. The secondary side second terminal and the second connection portion are formed so as to stand in the axial direction from the half-circumferential portion of the second bus bar, and the first connection portion and the second connection portion. The main surfaces of each other are in contact with each other and fixed while maintaining conductivity, and the secondary side first terminal and the secondary side Two-terminal and is preferably disposed adjacent to each other across the gap in the circumferential direction in a state in which a short circuit is prevented (claim 6).
In this case, a secondary coil having a structure in which the secondary side first terminal and the secondary side second terminal are adjacent in the circumferential direction through a narrow gap can be easily manufactured by using two bus bars. Can do.

The secondary side first terminal and the secondary side second terminal are preferably drawn out from both ends of the secondary winding portion so as to intersect each other.
In this case, since the terminals intersect and are drawn, the radiation amount of electromagnetic wave noise from the intersecting portion is reduced.

Example 1
A transformer according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the transformer 1 of the present invention includes a core 4 made of a magnetic material. And the primary coil 10 which has the primary winding part 11 wound by the core 4 multiple times and the primary side terminal 12 pulled out from the both ends of the primary winding part 11 is provided. Further, a secondary coil 20 that is wound around the core 4 and has a secondary winding portion 21 that is formed in a flat plate shape of one turn and a secondary terminal 22 that is drawn from both ends of the secondary winding portion 21. Is arranged concentrically with the primary coil 10 on one side in the axial direction of the primary coil 10. And all the parts of the primary winding part 11 are comprised so that it may overlap with the secondary winding part 21 in an axial direction.

  The secondary side terminal 22 includes a secondary side first terminal 22 a drawn from one end of the secondary winding part 21 and a secondary side second terminal 22 b drawn from the other end of the secondary winding part 21. The secondary side first terminal 22 a and the secondary side second terminal 22 b are configured to overlap each other in the axial direction of the secondary winding portion 21.

More specifically, the secondary coil 20 is made of a copper plate called a bus bar. Moreover, the core 4 is comprised from the 1st core 4a arrange | positioned at the other side of an axial direction, the 2nd core 4b, and the 3rd core 4c arrange | positioned at an axial direction one side as shown in FIG.
The first core 4 a includes a plate-like main body 40, and a wall 42 and a column 41 that protrude from the main body 40 toward the third core 4 c. The second core 4b has the same structure, and includes a plate-like main body 43, and a wall 45 and a pillar 44 projecting from the main body 43 toward the third core 4c. The third core 46 includes a plate-like main body 46, wall portions 47 and 48 projecting from both ends of the main body 46 toward the first core 4 a and the second core 4 b, and a central position of the main body 46. A first core 4a and a column part 49 projecting toward the second core 4b are provided.

  As shown in FIG. 1, the wall portion 42 of the first core 4 a is in contact with the wall portion 47 of the third core 4 c, and the column portion 41 is in contact with the column portion 49. Further, the wall portion 45 of the second core 4 b is in contact with the wall portion 48 of the third core 4 c, and the column portion 44 is in contact with the column portion 49. The primary coil 10 and the secondary coil 20 are wound around the column portions 41, 44, and 49.

  As shown in FIG. 1, the main body portion 40 of the first core 4 a is formed in a shape that decreases in width as it goes from the wall portion 42 toward the column portion 41. Similarly, the main body 43 of the second core 4 b is formed in a shape in which the width gradually decreases from the wall 45 toward the column 44.

  Next, peripheral circuits of the transformer 1 will be described. As shown in FIG. 3, the transformer 1 includes a primary coil 10 and a secondary coil 20, and the primary coil 10 includes a first winding portion W1 and a second winding portion W2. The secondary coil 20 includes a third winding part W3 and a fourth winding part W4. A first transformer T1 is constituted by the first winding part W1 and the third winding part W3, and a second transformer T2 is constituted by the second winding part W2 and the fourth winding part W4.

As illustrated, the primary coil 10 is connected to the inverter 5. When a DC voltage is applied to the input terminals 51 and 52, it is converted into an AC voltage by the inverter 5, and an AC current flows through the primary coil 10. In addition, a current flows through the secondary coil 20 due to electromagnetic induction. Diodes 60 and 61 are connected to the secondary side first terminal 22a and the secondary side second terminal 22b, thereby rectifying the AC voltage and extracting the DC voltage. The cathodes of the diodes 60 and 61 are connected to the positive output terminal 62, respectively. The intermediate terminal 29 of the secondary coil 20 is a negative electrode, and a smoothing capacitor C is connected between the positive electrode and the negative electrode.
In this manner, by configuring the two transformers T1 and T2 in the transformer 1, it is possible to reduce the weight, and to simplify the circuit, reduce the switching loss, reduce the manufacturing cost, and the like.

  The transformer 1 of this example can be used for vehicles such as electric cars and hybrid cars. For example, a high voltage of about 300 V is applied to the input terminals 51 and 52. This high voltage is stepped down by the transformer 1 and a DC voltage of about 14V is taken out from the output terminals 62 and 63 to drive in-vehicle components such as a car air conditioner, a battery, and a light.

  On the other hand, as shown in FIGS. 4 and 5, the secondary coil 20 is configured by overlapping a first bus bar 23 and a second bus bar 26 made of a metal plate. The first bus bar 23 includes one half circumferential portion 21 a of the secondary winding portion 21, a secondary side first terminal 22 a, and a first connection portion 25 for connecting to the second bus bar 26. The second bus bar 26 includes the other half-circumferential portion 21 b of the secondary winding part 21, a secondary side second terminal 22 b, and a second connection part 28 for connecting to the first bus bar 23. And the 1st connection part 25 and the 2nd connection part 28 are fixed maintaining electroconductivity, overlapping in an axial direction. The secondary side first terminal 22a and the secondary side second terminal 22b are arranged so as to overlap each other in the axial direction in a state where a short circuit is prevented. As a method for preventing the short circuit, for example, a method of applying an insulating film to the surface of the secondary coil 20 or sandwiching insulating paper between the terminals 22a and 22b can be adopted.

  Further, the secondary coil 20 may be as shown in FIG. In this example, the secondary coil 20 is configured by using a single bus bar. As shown in the cross-sectional view of FIG. 6B, the secondary side first terminal 22a is formed in a step shape, and the secondary side second terminal is formed. The terminal 22b is configured to overlap in the axial direction. By sandwiching the insulating paper 7 between these terminals 22a and 22b, a short circuit between the terminals is prevented.

Next, the effect of the transformer 1 of this example will be described.
In the transformer 1 of this example, as shown in FIGS. 1 and 2, the secondary winding portion 21 covers all portions of the primary winding portion 11. Therefore, the radiation amount of electromagnetic noise can be reduced.
That is, as shown in FIGS. 11 and 12, the conventional transformer 90 has a region 96 where the primary coil 94 and the secondary coil 95 do not overlap, and a large amount of electromagnetic noise is radiated from this region 96. However, in the present invention, as shown in FIGS. 1 and 2, such a region 96 does not exist, and all portions of the primary winding portion 11 are covered with the secondary winding portion 21. Thereby, the radiation amount of electromagnetic wave noise can be reduced.

  More specifically, if the current flowing through the primary coil 10 is ip, the number of turns is n, the current flowing from the secondary side first terminal 22a to the secondary side second terminal 22b is is, and the primary side excitation current of the transformer 1 is im. , Is≈n (−im + ip). In addition, the magnetic field radiation from the portion where the primary coil 10 and the secondary coil 20 overlap is proportional to n × im (= is−n × ip). Further, the magnetic field radiation from the portion (see FIG. 12) 96 where the primary coil and the secondary coil do not overlap is proportional to n × ip. Usually, since ip> im is satisfied, the electromagnetic wave radiation can be greatly reduced by eliminating the portion where the primary winding portion 11 and the secondary winding portion 21 do not overlap as in this example.

As shown in FIGS. 1 and 2, the secondary side terminal 22 includes a secondary side first terminal 22a and a secondary side second terminal 22b, and the secondary side first terminal 22a and the secondary side second terminal 22b. The terminal 22b is configured to overlap each other in the axial direction of the secondary winding portion 21.
In this case, there is no gap in the circumferential direction between the secondary side first terminal 22a and the secondary side second terminal 22b. Thereby, all the parts of the primary winding part 11 will overlap with the secondary winding part 21 reliably, and the radiation amount of electromagnetic wave noise can be reduced.

As shown in FIGS. 4 and 5, the secondary coil 20 includes two bus bars 23 and 24.
In this case, the secondary coil 20 having a structure in which the secondary side first terminal 22a and the secondary side second terminal 22b are overlapped in the axial direction is easily manufactured by using the two bus bars 23 and 24. be able to.

  As described above, according to this example, it is possible to provide the transformer 1 that emits less electromagnetic noise.

(Example 2)
In this example, the shape of the secondary coil 20 is changed. As shown in FIG. 7, the transformer 1 of this example includes a core 4 made of a magnetic material. Moreover, the primary coil 10 which has the primary winding part 11 wound by the core 4 several times and the primary side terminal 12 pulled out from the both ends of the primary winding part 11 is provided. Furthermore, the secondary coil 20 is wound around the core 4 and has a secondary winding portion 21 formed in a flat plate shape of one turn and a secondary terminal 22 drawn out from both ends of the secondary winding portion 21. Is arranged concentrically with the primary coil 10 on one side in the axial direction of the primary coil 10. Both ends of the secondary winding part 21 are adjacent in the circumferential direction with a predetermined gap 3 therebetween, and the length of the gap 3 in the circumferential direction is 10% or less of the inner circumference of the secondary winding part 21. Further, all the portions of the primary winding portion 11 are configured to overlap the secondary winding portion 21 in the axial direction except for the region corresponding to the gap 3.

The secondary coil 20 is formed from a single bus bar. That is, as shown in FIG. 8, the secondary coil 20 is formed by punching a copper plate, and includes a secondary winding part 21, a secondary side first terminal 22 a drawn from both ends of the secondary winding part 21, a secondary A second side terminal 22b and an intermediate terminal 29 are provided. A gap 3 is formed between the secondary side first terminal 22a and the secondary side second terminal 22b.
In addition, the configuration is the same as that of the first embodiment.

The effect of Example 2 is demonstrated.
As shown in FIGS. 7 and 8, a gap 3 is formed between the secondary side first terminal 22a and the secondary side second terminal 22b, and the length of the gap 3 in the circumferential direction is determined by the secondary winding. It is 10% or less of the inner periphery of the portion 21.
In this case, although a gap is formed between both ends of the secondary winding part 21, the gap 3 is narrow, so that the amount of radiation can be reduced, and only an amount of electromagnetic wave noise that does not cause a problem is radiated.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, the shape of the secondary coil 20 is changed. As shown in FIG. 9, in this example, the secondary side terminal 22 is drawn from the secondary side first terminal 22 a drawn from one end of the secondary winding part 21 and the other end of the secondary winding part 21. Secondary side second terminal 22b, and secondary side first terminal 22a and secondary side second terminal 22b are erected in the axial direction from both ends of secondary winding portion 21, and are spaced apart in the circumferential direction. 3 are adjacent to each other so as to sandwich 3.

More specifically, in the example of FIG. 9, the secondary coil 20 is configured by overlapping a first bus bar 23 and a second bus bar 26 made of a metal plate. The first bus bar 23 includes one half-circular portion 21 a of the secondary winding portion 21, a secondary side first terminal 22 a, and a first connection portion 25 for connecting to the second bus bar 26. The second bus bar 26 includes the other half-circumferential portion 21 b of the secondary winding part 21, a secondary side second terminal 22 b, and a second connection part 28 for connecting to the first bus bar 23. The secondary side first terminal 22a and the first connection portion 25 are formed so as to stand in the axial direction from the half circumferential portion 21a of the first bus bar 23, and the secondary side second terminal 22b and the second connection portion 28 Is formed so as to stand upright from the half-circumferential portion 21b of the second bus bar 26 in the axial direction. The first connection portion 25 and the second connection portion 28 are fixed with their main surfaces in contact with each other and kept conductive, and the secondary side first terminal 22a and the secondary side second terminal 22b are short-circuited. In a prevented state, they are arranged adjacent to each other across the gap 3 in the circumferential direction. As a method for preventing the short circuit, a method of sandwiching an insulating paper between the secondary side first terminal 22a and the secondary side second terminal 22b can be employed.
In addition, the configuration is the same as that of the first embodiment.

The effect of Example 3 is demonstrated.
As shown in FIG. 9, the secondary side first terminal 22 a and the secondary side second terminal 22 b are erected in the axial direction from both ends of the secondary winding portion 21, and sandwich the gap 3 in the circumferential direction. Adjacent.
In this case, a thin insulator such as insulating paper can be sandwiched between the secondary side first terminal 22a and the secondary side second terminal 22b. Thereby, the gap 3 between the terminals 22a and 22b can be narrowed while preventing a short circuit between the terminals 22a and 22b.

Further, in the example shown in FIG. 9, the secondary coil 20 is composed of two bus bars 23 and 26.
In this case, the secondary coil 20 having a structure in which the secondary side first terminal 22a and the secondary side second terminal 22b are adjacent in the circumferential direction through the narrow gap 3 is used with the two bus bars 23 and 26. It can be easily manufactured.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
In this example, the shape of the secondary coil 20 is changed. In this example, as shown in FIG. 10, the secondary side first terminal 22 a and the secondary side second terminal 22 b are drawn from both ends of the secondary winding portion 21 so as to intersect each other.
In addition, the configuration is the same as that of the first embodiment.

In this case, since the terminals 22a and 22b are crossed and drawn out, the radiation amount of electromagnetic wave noise from the crossing portion is reduced.
In addition, the same effects as those of the first embodiment are obtained.

FIG. 3 is an exploded perspective view of a transformer in the first embodiment. FIG. 3 is a partial perspective plan view of the transformer in the first embodiment. FIG. 3 is a circuit diagram of a transformer in the first embodiment. The top view of the bus bar which comprises the secondary coil in Example 1. FIG. The figure which accumulated the bus-bar of FIG. The (A) top view of the secondary coil comprised from one bus bar in Example 1 (B) AA sectional drawing of FIG. 6 (A). FIG. 6 is an exploded perspective view of a transformer in the second embodiment. The top view of the secondary coil in Example 2. FIG. (A) Top view (B) Perspective view of the secondary coil comprised from two bus bars in Example 3. FIG. The (A) top view (B) perspective view of the secondary coil in Example 4. FIG. The disassembled perspective view of the trans | transformer in a prior art example. The partial perspective top view of the trans | transformer in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer 10 Primary coil 11 Primary winding part 12 Primary side terminal 20 Secondary coil 21 Secondary winding part 22 Secondary side terminal 22a Secondary side first terminal 22b Secondary side second terminal 23 First bus bar 26 Second Busbar 3 Gap 4 Core

Claims (7)

A core made of magnetic material,
A primary coil having a primary winding wound around the core a plurality of times, and primary terminals drawn from both ends of the primary winding;
A secondary winding portion disposed concentrically with the primary coil on one side in the axial direction of the primary coil, wound around the core and formed into a flat plate shape of one turn, and the secondary winding portion A secondary coil having a secondary side terminal drawn from both ends of
The transformer is characterized in that all parts of the primary winding part are configured to overlap the secondary winding part in the axial direction.   2. The secondary side terminal according to claim 1, wherein the secondary side terminal includes a secondary side first terminal drawn from one end of the secondary winding portion and a secondary side second lead drawn from the other end of the secondary winding portion. A transformer comprising: a terminal, wherein the secondary side first terminal and the secondary side second terminal are configured to overlap each other in an axial direction of the secondary winding portion.   The secondary coil according to claim 2, wherein the secondary bus bar is configured by overlapping a first bus bar and a second bus bar made of a metal plate, and the first bus bar includes one half-circular portion of the secondary winding portion, A secondary side first terminal and a first connection part for connecting to the second bus bar, wherein the second bus bar comprises the other half-circumferential part of the secondary winding part and the secondary side second A terminal and a second connection part for connecting to the first bus bar, wherein the first connection part and the second connection part are fixed while maintaining conductivity while overlapping in the axial direction, and the secondary side The transformer, wherein the first terminal and the secondary side second terminal are arranged so as to overlap each other in the axial direction in a state where a short circuit is prevented. A core made of magnetic material,
A primary coil having a primary winding wound around the core a plurality of times, and primary terminals drawn from both ends of the primary winding;
A secondary winding portion disposed concentrically with the primary coil on one side in the axial direction of the primary coil, wound around the core and formed into a flat plate shape of one turn, and the secondary winding portion A secondary coil having a secondary side terminal drawn from both ends of
The both ends of the secondary winding part are adjacent to each other in the circumferential direction with a predetermined gap therebetween, and the length of the gap in the circumferential direction is 10% or less of the inner circumference of the secondary winding part. A transformer characterized in that all parts of the primary winding portion are configured to overlap the secondary winding portion in the axial direction except for a region corresponding to the gap.   5. The secondary side terminal according to claim 4, wherein the secondary side terminal includes a secondary side first terminal drawn from one end of the secondary winding part and a secondary side second lead drawn from the other end of the secondary winding part. And the secondary side first terminal and the secondary side second terminal are erected in the axial direction from both ends of the secondary winding portion, and are adjacent to each other so as to sandwich the gap in the circumferential direction. Transformer characterized by   The secondary coil according to claim 4, wherein the secondary coil is configured by superimposing a first bus bar and a second bus bar made of a metal plate, and the first bus bar is one half circumference of the secondary winding portion. Part, the secondary side first terminal, and a first connection part for connecting to the second bus bar, wherein the second bus bar comprises the other half-circumferential part of the secondary winding part and the second bus bar. A secondary side second terminal and a second connection part for connecting to the first bus bar, wherein the secondary side first terminal and the first connection part are axial from the half-circumferential portion of the first bus bar. The secondary side second terminal and the second connection portion are formed to stand in the axial direction from the half-circumferential portion of the second bus bar, and the first connection And the second connecting portion are fixed with the main surfaces in contact with each other to maintain conductivity. The first terminal and the secondary side second terminal, the transformer, characterized in that it is arranged so as to be adjacent to each other across the gap in the circumferential direction in a state in which a short circuit is prevented.   7. The transformer according to claim 6, wherein the secondary side first terminal and the secondary side second terminal are drawn out from both ends of the secondary winding portion so as to intersect each other.

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