JP2007180352A - Coil assembly of high frequency transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable accurate fine adjustment of leakage magnetic flux as far as a fine level, remarkable expansion of the adjustment/control range from a small value to a large value, adjustment and control of a coupling coefficient, adjustment of resonance, reduction of an internal electrostatic capacity, application even to a transformer having a large current capacity, acquisition of high stability, performance, and characteristic, simple manufacture with a simple structure, good productivity and low cost, and thus satisfaction of demands of many customers. <P>SOLUTION: The above problem is solved by parallelly overlapping part or whole of the engaged winding state between cyclidrical primary and secondary windings 11 and 12 arranged side by side with respect to the axial direction and changing the length of the overlap. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coil assembly of a high-frequency transformer that can control leakage magnetic flux.

  One of the coil assemblies of a high-frequency transformer is shown in FIG. The coil assembly of this high-frequency transformer includes a single primary coil having a large number of turns, in which a plurality of flat conductors formed in a U-shape are stacked via an insulating material while being in contact with each other in a spiral manner. A plurality of secondary coils with a small number of turns are formed, the plurality of secondary coils are electrically connected in parallel and sandwiched between the primary coils, and the whole is tightened with a plurality of bolts and nuts. .

  However, in the structure as shown in FIG. 13 of Patent Document 1, the mutual inductance, coupling coefficient, leakage inductance, and self-inductance fluctuate due to the tightening of the bolts and nuts, resulting in poor stability. Therefore, it is difficult to adjust and control the leakage magnetic flux, and the inductance and coupling coefficient cannot be made sufficiently good, and a high-performance high-frequency transformer cannot be obtained. In addition, the number of parts increases, making it difficult to manufacture, resulting in poor productivity and high cost.

  Next, there is one disclosed in Patent Document 2 below. The coil assembly of this high-frequency transformer has an appropriate number of dielectric substrates on which a primary coil pattern is formed and an appropriate number of dielectric substrates on which a secondary coil pattern is formed. Is connected to.

  However, in the case of this patent document 2, such a structure cannot make a coupling coefficient, a leakage inductance, etc. favorable, adjustment and control of leakage magnetic flux are impossible, and a high-performance high frequency transformer cannot be obtained. Of course, it is extremely difficult to make the current capacity large.

  In this respect, in the one shown in Patent Document 3 below, a plurality of spiral coils formed by arranging the patterns of the primary coil and the secondary coil on the same substrate are stacked, so that the coupling coefficient is increased. Is possible.

  However, even in the case of Patent Document 3, it is impossible to adjust and control the leakage flux with such a structure, and it is extremely difficult to make the current capacity large.

JP 2000-150259 A JP 2001-6941 A JP 2002-141228 A

  In view of this, the present invention makes it possible to finely adjust the leakage magnetic flux and hence the leakage inductance to a fine level by changing the overlapping state of the windings between the primary coil and the secondary coil. Therefore, the leakage inductance can be adjusted and the control range can be greatly expanded from a small value close to zero to a large value, and the coupling coefficient can be adjusted and controlled. In addition, it is possible to adjust resonance with the capacitance existing in the transformer or in the external connection circuit, and can be applied to a device having a large current capacity without difficulty. It is possible to reduce the capacitance, and to provide an excellent high-frequency transformer that exhibits high stability and high performance and high characteristics. However, the challenge is to make the structure simple, easy, productive and low-cost, so that a wide range of customer requirements can be easily and quickly satisfied. .

  Thus, the coil assembly of the high-frequency transformer according to the present invention is characterized in that a part of or all of the windings of the cylindrical primary coil and the secondary coil provided side by side in the axial direction are stacked in parallel in an engaged state. And

  According to the present invention, due to the configuration, in the primary coil and the secondary coil, leakage magnetic flux is generated in a portion where the windings are not overlapped with each other, and leakage inductance is generated. Therefore, it is extremely easy to change the overlapping length. The leakage magnetic flux and the leakage inductance can be easily changed, the coupling coefficient between the coils can be changed, and the capacitance inside the transformer can be reduced. Therefore, the above-described problem can be solved.

  A coil assembly of a high-frequency transformer in which a part or all of windings of a cylindrical primary coil and a secondary coil provided side by side in an axial direction are stacked in parallel in a meshed state, and the primary coil and the secondary coil The coils are each formed into a spiral coil by edgewise winding of an insulating coated rectangular conductive band, and the coils are partly or wholly screwed together. This will be described in detail in Examples.

  The other one is a coil assembly of a high-frequency transformer in which a part or all of windings of a cylindrical primary coil and a secondary coil provided side by side in the axial direction are overlapped in parallel in a meshed state. Then, a part or all of the windings stacked in parallel with the meshing state of the primary coil and the secondary coil are twisted together. In other words, if the length of the portion of the primary coil and the secondary coil that are overlapped in parallel with each other in the meshing state has already been dimensionally determined by the prototype test, the winding before winding of the winding is possible. If the overlapping parts of the wires are twisted together in advance, the winding of the primary coil and the secondary coil will be connected to one, so if you just wind this as a single coil in the shape of a cylinder, the result In particular, the windings of the primary coil and the secondary coil are formed in the same structure as the coil assembly in which the main portions overlap each other in the meshing state. Therefore, it can be manufactured more easily and quickly, and the cost can be reduced.

  FIGS. 1 to 3 show a cored high-frequency transformer provided with a coil assembly according to the present invention. This high-frequency transformer has a ferrite core 1 having a closed rectangular magnetic path that is long in the height direction. A pair of support legs 2 are fixed to the lower portion with bolts / nuts 3 and fastening bands 4, and two identical coil assemblies 6 are attached to both sides 5 of the ferrite core 1.

  Both coil assemblies 6 have primary and secondary coils 11 and 12 formed into spiral coils 9 and 10 having the same inner diameter and the same outer diameter by edgewise winding insulation-coated rectangular conductive bands 7 and 8, respectively. And the primary coil 11 and the secondary coil 12 are electrically connected in parallel or in series via a pair of crimp terminals 13 and 14. For the insulation coated rectangular conductive bands 7 and 8, a polyester resin coated rectangular copper band or the like may be used.

(1) Experiment 1
In the above configuration, the primary coil 11 and the secondary coil 12 of both the coil assemblies 6 are both formed to have a winding number of 10T, and both the primary coil 11 and the secondary coil 12 are electrically connected in parallel. The number of turns of both of the primary coil 11 and the secondary coil 12 that are overlapped by screwing is changed from 10T (see FIG. 4) to 1T, and the frequency is 20 kHz, 50 kHz, and 100 kHz. When the leakage inductance Ll was measured, the following result was obtained.
Ferrite core 1: UU120 × 160 × 120
Insulation coated rectangular conductive bands 7, 8: 2 × 5.5 PEW
Measurement equipment used: HP 4194A
IMPEDANCE / GAIN-PHASE ANALYZER
INTEG TIME: MED
AVERAGING: 8

分離１ ： 一次コイル１１と二次コイル１２とが分離しただけのもの
分離２ ： 分離した各コイルの隙間を軸方向に圧縮したもの

Separation 1: The primary coil 11 and the secondary coil 12 are separated only. Separation 2: The gap between the separated coils is compressed in the axial direction.

  From Table 1, it can be seen that the inductance L does not vary greatly in either case.

分離１ ： 一次コイル１１と二次コイル１２とが分離しただけのもの
分離２ ： 分離した各コイルの隙間を軸方向に圧縮したもの

Separation 1: The primary coil 11 and the secondary coil 12 are separated only. Separation 2: The gap between the separated coils is compressed in the axial direction.

  Looking at Table 2 as a graph for each frequency, it becomes as shown in FIGS. 5 to 7, and it can be seen that the leakage inductance Ll is a smooth curve that changes in accordance with the number of turns. Further, when the case of 0T separation 1 and the case of 0T separation 2 are compared, the difference is obvious, and the gap between the coils when the primary coil 11 and the secondary coil 12 do not overlap each other is large in the leakage inductance Ll. You can see that they are involved. As a result, when parallel connection is used, the characteristics of the primary coil 11 and the secondary coil 12 in terms of screw advance / retreat and increase / decrease in the leakage inductance Ll are very stable, and the leakage inductance Ll, that is, the leakage magnetic flux is mechanically applied between the coils. It can be seen that it can be finely adjusted smoothly by advancing and retreating smoothly, and can be adjusted precisely over a wide range, and the coupling coefficient between coils can be adjusted in the same manner.

(2) Experiment 2
In the above-described configuration, the primary coil 11 and the secondary coil 12 of both the coil assemblies 6 are both formed to have a winding number of 72T, and both the primary coil 11 and the secondary coil 12 are electrically connected in series. The number of turns of one coil assembly 6 that is overlapped by the primary coil 11 and the secondary coil 12 is fixed to 72T {100%} (see FIG. 8A), and the number of turns of the other coil assembly 6 is 72T { 100%}, 71T {99%} (see FIG. 8B), 70T {98%}, 68T {95%}, 65T {90%}, 61T {85%}, 57T {80%} When the inductance L and the leakage inductance Ll were measured for each of 20 kHz, 50 kHz, and 100 kHz, the following results were obtained.
Ferrite core 1: UU120 × 160 × 120
Insulation coated rectangular conductive bands 7, 8: 0.9 × 9 PEW
Measurement equipment used: HP 4194A
IMPEDANCE / GAIN-PHASE ANALYZER
INTEG TIME: MED
AVERAGING: 8

  According to Table 3, it can be seen that the inductance L exhibits a high value due to series connection, and the inductance L increases as the number of stacked turns decreases and the frequency increases. As a result, when the series connection is used, not only the value of the inductance L can be increased, but also the magnitude of the inductance L can be reduced by mechanical screwing between the primary coil 11 and the secondary coil 12. It can be adjusted and can be accurately adjusted over a wide range.

  Looking at Table 4 as a graph for each frequency, it becomes as shown in FIGS. 9 to 11, and it can be seen that the leakage inductance L1 is a smooth curve that changes in accordance with the number of turns. As a result, when the series connection is used, the characteristics relating to the screw advance / retreat between the primary coil 11 and the secondary coil 12 and the increase / decrease of the leakage inductance Ll are very stable, and the leakage inductance Ll, that is, the leakage magnetic flux is mechanically applied between the coils. It can be seen that fine adjustment can be made smoothly by moving forward and backward, and that it can be accurately adjusted over a wider range than in the case of parallel connection, and the coupling coefficient between the coils can be adjusted in the same manner.

  Therefore, according to the first embodiment, the desired problem can be solved and the desired effect can be achieved.

  In the illustrated embodiment 1, the coil assembly 6 is mounted only on the both sides 5 of the ferrite core 1. However, the primary coil 11 and the secondary coil 12 of the coil assembly 6 are each insulatively coated rectangular conductive bands. Since 7 and 8 are wound edgewise to form the spiral coils 9 and 10, the ferrite core 1 can be advanced to the corner, upper side, and lower side, thereby further improving efficiency and performance. be able to.

  12 and 13 show an air-core type high-frequency transformer comprising only one coil assembly according to the present invention. In this case, since one coil assembly 6 is configured in the same manner as in the first embodiment, much of the description is omitted in the description of the first embodiment. More specifically, the primary coil 11 and the secondary coil 12 are, for example, 0 .8 × 8 PEW Insulating coated rectangular conductive band is used to form a winding number of 7T and screwed forward and backward. In this way, even in the case of the air core type, the leakage magnetic flux and hence the leakage inductance can be adjusted by simply screwing back and forth between the coils, and the coupling coefficient between the coils can also be adjusted. Therefore, also in the case of the second embodiment, the desired problem can be solved and the desired effect can be exhibited.

  The coil assembly of the high-frequency transformer of the present invention can be widely used for converter transformers, insulating transformers, impedance converters, and the like.

It is a top view which shows Example 1 of the coil assembly which concerns on this invention. It is a front view of the same Example 1. It is a partially cutaway side view of Example 1. It is explanatory drawing about the experiment 1 of the Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency of 20 kHz about Table 2 of the said Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency 50kHz about Table 2 of the Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency of 100 kHz about Table 2 of the Example 1. FIG. It is explanatory drawing about the experiment 2 of the Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency of 20 kHz about Table 4 of the said Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency 50kHz about Table 4 of the Example 1. FIG. It is a graph which shows the leakage inductance in the measurement frequency of 100 kHz about Table 4 of the Example 1. FIG. It is a top view which shows Example 2 of the coil assembly of the high frequency transformer which concerns on this invention. It is a front view of the same Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ferrite core 2 Support leg 3 Bolt and nut 4 Fastening band 5 Side 6 Coil assembly, Insulation covering rectangular conductive band 9,10 Screw coil 11 Primary coil 12 Secondary coil 13, 14 Crimp terminal

Claims (3)

  A coil assembly for a high-frequency transformer, wherein a part or all of a winding of a cylindrical primary coil and a secondary coil provided side by side in an axial direction are stacked in parallel in a meshed state.   2. The high-frequency transformer according to claim 1, wherein the primary coil and the secondary coil are each formed into a spiral coil by edgewise winding of an insulating coated rectangular conductive band, and the coils are partially or entirely screwed together. Coil assembly.   2. A coil assembly for a high-frequency transformer according to claim 1, wherein a part or all of the windings overlapped in parallel with the meshing state of the primary coil and the secondary coil are twisted together.

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