JP2008047595A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer that is small in size and the degree of magnetic coupling is made high. <P>SOLUTION: The transformer is comprised of a bobbin 1, a core, primary windings A1, A2 and A3, and secondary windings B1 and B2. A plurality of winding frames 41-47 are formed around the periphery of the bobbin 1 by using flanges 31-38. The primary winding A1 is wound around the winding frame 41 between the flanges 31 and 32, the primary winding A2 is wound around the winding frame 44 between the flanges 34 and 35, and the primary winding A3 is wound around the winding frame 47 between the flanges 37 and 38. In addition, the secondary winding B1 is wound around the winding frame 42 between the flanges 32 and 33 and the winding frame 43 between the flanges 33 and 34, and the secondary winding B2 is wound around the winding frame 45 between the flanges 35 and 36 and the winding frame 46 between the flanges 36 and 37. Pins 13-24 are erected at the flanges 31 and 38 located at both ends of the bobbin 1 to connect the ends of the respective windings. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transformer, and more particularly to a transformer in which a primary winding and a secondary winding are wound adjacent to each other in an axial direction on a bobbin having a core.

  Conventionally, as a high-voltage transformer, a primary winding and a secondary winding that are divided and wound, as described in Patent Document 1, the outer periphery of the bobbin is divided into a plurality of winding frames by a plurality of flanges. The windings that were divided and wound around these winding frames were entangled with pins that were planted for each buttock. In the case of mechanical winding, planting pins for each buttock can handle any winding order, and the manner of connection between windings can be freely determined by routing the pattern on the wiring board on which the transformer is mounted. You can design.

However, since the pins are planted for each flange, pin mounting dimensions and strength are required, so the width of the flange is inevitably increased, the degree of coupling for each winding is reduced, and leakage occurs. There was a problem that the inductance was increased. In order to increase the degree of coupling, there is a method of reducing the number of turns, but in that case, it is necessary to increase the cross-sectional area of the core, that is, to increase the size of the transformer and to reduce the self-inductance. Absent.
JP 2002-110439 A

  Accordingly, an object of the present invention is to provide a transformer having a small degree of magnetic coupling between windings while being small.

In order to achieve the above object, the present invention provides a cylindrical body having a through-hole, a bobbin having a plurality of winding frames formed by a plurality of flanges, and a core that is inserted into the through-hole to form a closed magnetic circuit A transformer consisting of
The plurality of winding frames are formed at least 5 or more,
The primary winding on the part where the secondary winding is wound on the winding frame on both sides of the primary winding wound on the winding frame, or on the winding frame on both sides of the secondary winding wound on the winding frame There are at least two places where is wound,
A plurality of pins for tangling the primary winding and the secondary winding are planted at least at the collars located at both ends of the bobbin;
It is characterized by.

  In the transformer according to the present invention, there are at least two structures in which both sides of the primary winding are sandwiched between the secondary windings, or both sides of the secondary winding are sandwiched between the primary windings, the primary winding and the secondary winding. By connecting the lines in series or in parallel, the divided secondary winding or primary winding is coupled from three directions, and the degree of magnetic coupling between the primary winding and the secondary winding is increased. Furthermore, since the pins for linking the primary winding and the secondary winding are intensively planted in at least the collars located at both ends of the bobbin, it is not necessary to plant the pins in all the collars. Since the flange portion where no pin is implanted can be reduced in width, the degree of magnetic coupling between the windings becomes higher and the size is reduced.

  In the transformer according to the present invention, the primary winding or the secondary winding wound around the bobbin in the substantially central part of the bobbin is implanted in either of the flanges located on both sides of the substantially central part of the bobbin. The primary winding or secondary winding that is wound around the other pin other than the central frame is connected to the pins that are implanted in the collars located at both ends of the bobbin. It may be tied. On the other hand, it is preferable that all of the primary winding and the secondary winding are entangled with pins implanted in the collars located at both ends of the bobbin.

  By the way, in this type of transformer, the voltage of the secondary winding is considerably higher than that of the primary winding, and it is necessary to ensure sufficient insulation against the secondary winding. The part is inevitably thicker than the flange part that partitions between the primary windings and between the secondary windings. Therefore, it is preferable that the primary winding is wound on the outermost winding frame among the plurality of winding frames. When the primary winding is wound around the outermost winding frame, the outermost flange portion of the bobbin may be thinned, and the transformer is downsized accordingly.

  Also, a protrusion is provided on one of the plurality of flanges located between the primary winding and the secondary winding, and the secondary winding wound around the pin is hooked on the protrusion and wound around the winding frame. Thus, the winding direction of the secondary winding may be reversed. When the secondary windings are connected in series, the pattern can be easily routed on the wiring board on which the transformer is mounted. When the secondary windings are used individually, the phase of each winding can be changed.

  According to the present invention, the primary winding and the secondary winding are divided and adjacent to each other and the distance between adjacent windings is made as small as possible to increase the degree of magnetic coupling between the two windings and achieve miniaturization. be able to.

  Embodiments of a transformer according to the present invention will be described below with reference to the accompanying drawings. Note that parts and portions common to each embodiment described below are denoted by the same reference numerals, and redundant description is omitted.

(Refer 1st Example and FIGS. 1-4)
As shown in FIGS. 1 and 2, the transformer according to the first embodiment includes a bobbin 1, a core 5, primary windings A1, A2, A3, and secondary windings B1, B2. The bobbin 1 is a cylindrical body having a through hole 2, and the core 5 is inserted into the through hole 2. This transformer is mounted such that the through hole 2 is parallel to the surface (mounting surface) of the wiring board 50.

  A plurality of winding frames 41 to 47 are formed on the outer peripheral portion of the bobbin 1 by a plurality of flange portions 31 to 38. The primary winding A1 is wound around the winding frame 41 between the flange portions 31, 32, the primary winding A2 is wound around the winding frame 44 between the flange portions 34, 35, and the primary winding A3 is wound around the flange portions 37, 38. It is wound around a winding frame 47 between them. The secondary winding B1 is wound around the winding frame 42 between the flange portions 32 and 33 and the winding frame 43 between the flange portions 33 and 34, and the secondary winding B2 is wound around the winding frame 45 between the flange portions 35 and 36. And a winding frame 46 between the flange portions 36 and 37.

  In the first embodiment, pins 13 to 24 for tying the respective windings are planted on the bottom surfaces of the outermost flange portions 31 and 38. Here, the connection relationship between the pins 13 to 24 and the windings will be described with reference to FIGS.

  The description will be made according to the mechanical winding sequence. First, the primary winding A1 is wound around the pin 16 at one end, wound around the winding frame 41, and then wound around the pin 15. One end of the primary winding A <b> 3 is wound around the pin 20, wound around the winding frame 47, and the other end is wound around the pin 23. One end of the secondary winding B1 is entangled with the pin 13, hooked on the protrusion 32a provided on the end surface of the collar portion 32 and wound around the winding frames 42 and 43, and then provided on the end surface of the collar portion 33. The other end is tied to the pin 18 by being hooked on the protrusion 33a. One end of the secondary winding B2 is entangled with the pin 19 and wound around the winding frames 46 and 45, and then hooked on the protrusion 36a provided on the end surface of the flange 36, and the other end is entangled with the pin 24. It is done. Finally, one end of the primary winding A2 is entangled with the pin 21, wound around the winding frame 44, and then hooked on the protrusion 35a provided on the end surface of the flange 35, and the other end is entangled with the pin 22. It is done.

  The primary windings A1, A2, A3 are connected in parallel as shown in FIG. 3A through the pins 15, 16, 21, 22, and 20, 23, or as shown in FIG. Connected in series. When connected in parallel, the primary windings A1, A2, A3 must have the same number of turns. When connected in series, the turn ratio of the primary windings A1, A2, A3 preferably satisfies the relationship of A1 + A3 = A2. Further, as shown in FIG. 3A, the secondary windings B1 and B2 are connected to the pins 13 and 19, and the pin 24 is connected to the ground, the secondary output is taken out from the pin 18. Alternatively, as shown in FIG. 3B, the pins 13 and 24 are connected to the ground, and the secondary outputs are taken out from the pins 18 and 19. Note that the pin 24 in FIG. 3A and the pins 13 and 24 in FIG. 3B may be a predetermined reference potential instead of the ground. Incidentally, the lines (indicated by bold lines) connecting the pins 15, 16, 20 to 23, 13, 19 in FIG. 3 and FIG. 4 are usually formed by a conductor pattern (not shown) formed on the wiring board 50. Although done, it may be connected on a transformer.

  A well-known feedback winding for pseudo-detecting the output voltage on the secondary side is wound around the winding frame 41 between the pins 14 and 17.

  In the first embodiment, as shown in FIG. 2, the primary windings A1, A2 are formed by sandwiching both sides of the secondary windings B1, B2 with the primary windings A1, A2 and A2, A3. , A3 and the secondary windings B1 and B2 have extremely high magnetic coupling. Further, as shown in FIG. 3B, even when the secondary windings B1 and B2 are individually used as separate outputs, the magnetic coupling between the primary windings A1, A2, and A3 and the secondary windings B1 and B2 The degree will be higher. Further, the pins 13 to 24 for binding the primary windings A1, A2 and A3 and the secondary windings B1 and B2 are all planted in the base portions 31a and 38a of the flange portions 31 and 38 located at both ends of the bobbin 1. Therefore, it is not necessary to plant pins in the other flange portions 32 to 37, and the width portions of the flange portions 32 to 37 that do not have pins implanted can be reduced, so that the degree of magnetic coupling between the windings can be reduced. Get higher. At the same time, the transformer itself is reduced in size.

  By the way, in this type of transformer, the voltages of the secondary windings B1, B2 are considerably higher than those of the primary windings A1, A2, A3, and it is necessary to sufficiently ensure the insulation with respect to the secondary windings B1, B2. . Therefore, the collar parts 32, 34, 35, and 37 are made slightly thicker as necessary than the other collar parts 31, 33, 36, and 38. In this case, in the first embodiment, since the primary windings A1 and A3 are wound around the outermost winding frames 41 and 47, the outermost flange portions 31 and 38 of the bobbin 1 are made thinner. Well, the transformer is downsized accordingly.

(Refer to the second embodiment, FIGS. 5 and 6)
As shown in FIG. 5, the transformer of the second embodiment basically has the same configuration as that of the first embodiment except that one end of the secondary winding B1 is entangled with the pin 13. The hook 32 is hooked on the projections 32 a and 32 b provided on the end face of the hook 32, drawn to the opposite side, wound on the winding frames 42 and 43, and then hooked on the protrusion 33 a provided on the end face of the hook 33 to pin the other end. It is in the point entwined in 18. As a result, the winding direction of the secondary winding B1 is opposite to that of the secondary winding B1 in the first embodiment. Therefore, in order to connect the secondary windings B1 and B2 in series, the pins 13 and 24 are connected as shown in FIG. 6A, but the conductor pattern 51 on the wiring board on which the transformer is mounted. (Indicated by a dotted line in FIG. 5) can be set to the shortest distance, and the conductor pattern 51 can be easily routed.

  The pins 15, 16, 21, 22, and 20, 23 of the primary windings A1, A2, A3 are connected in parallel as shown in FIG. 6 (A) or in series as shown in FIG. May be connected. Further, as shown in FIG. 6A, the secondary windings B1 and B2 are connected to the pins 13 and 24, and when the pin 19 is connected to the ground, the secondary output is taken out from the pin 18. Alternatively, as shown in FIG. 6B, the pins 13 and 24 are connected to the ground, and the secondary outputs are taken out from the pins 18 and 19. Note that the pin 19 in FIG. 6A and the pins 13 and 24 in FIG. 6B may be at a predetermined reference potential instead of the ground.

  When the secondary windings B1 and B2 are used as individual outputs as shown in FIG. 3B, which is the first embodiment, the output waveforms are in phase as shown in FIG. 7A. On the other hand, as shown in FIG. 6B, which is the second embodiment, when used as individual outputs, the output waveform is in reverse phase as shown in FIG. 7B.

  The operation and effect of the second embodiment is the same as that of the first embodiment. Further, the secondary winding B1 is wound in the opposite direction to that of the first embodiment, so that the pins 13, The conductor pattern 51 for connecting 24 is easily routed.

(Refer to the third embodiment, FIG. 8)
The transformer according to the third embodiment is a modification of the first embodiment, in which the width of the flange 34 is slightly increased and pins 21 and 22 are implanted on the bottom surface. Although the bobbin 1 is slightly longer, the primary winding A1 and A3 are followed by the winding operation of the primary winding A2 and the binding operation to the pins 21 and 22, and the primary winding and the secondary winding. Since the winding machine can be switched only once, the working time can be shortened. Moreover, since the routing is shortened, the operation becomes easy.

(Refer to the fourth embodiment, FIG. 9)
The transformer according to the fourth embodiment is a modification of the second embodiment, in which the width of the flange 34 is slightly increased and pins 21 and 22 are implanted on the bottom surface thereof. Although the bobbin 1 is slightly longer, the winding work of the primary winding A2 and the tying work to the pins 21 and 22 are facilitated.

(Other examples)
The transformer according to the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the gist.

  For example, the structural details of the bobbin and the shape of each hook are arbitrary, and the planting position of each pin is also arbitrary other than concentrating on the hooks located at both ends.

  In particular, in the third and fourth embodiments, the pins 21 and 22 are implanted by slightly increasing the width of the flange 34 at the intermediate position. The pins 21 and 22 may be implanted by slightly increasing the width dimension. In this case, pins 19 and 24 for binding the secondary winding B2 may be implanted in the flange portion 35.

It is sectional drawing which shows 1st Example of the trans | transformer which concerns on this invention. It is a bottom view which shows the transformer which is the said 1st Example. It is a circuit diagram which shows the example of a connection of the trans | transformer which is the said 1st Example. It is a circuit diagram which shows the other connection example of the trans | transformer which is the said 1st Example. It is a bottom view which shows the 2nd Example of the transformer which concerns on this invention. It is a circuit diagram which shows the example of a connection of the trans | transformer which is the said 2nd Example. It is a chart figure which shows the output waveform of the secondary winding in the said 1st Example and 2nd Example. It is a bottom view which shows the transformer which is 3rd Example of this invention. It is a bottom view which shows the transformer which is 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bobbin 2 ... Through-hole 5 ... Core 13-24 ... Pin 31-38 ... Gutter 41-47 ... Winding frame A1, A2, A3 ... Primary winding B1, B2 ... Secondary winding

Claims (5)

A transformer comprising a bobbin having a cylindrical body having a through hole and having a plurality of winding frames formed by a plurality of flanges, and a core that is inserted into the through hole and forms a closed magnetic path,
The plurality of winding frames are formed at least 5 or more,
The primary winding on the part where the secondary winding is wound on the winding frame on both sides of the primary winding wound on the winding frame, or on the winding frame on both sides of the secondary winding wound on the winding frame There are at least two places where is wound,
A plurality of pins for tangling the primary winding and the secondary winding are planted at least at the collars located at both ends of the bobbin;
Transformer characterized by The primary winding or the secondary winding wound around the bobbin in the substantially central part of the bobbin is entangled with a pin implanted in either of the flanges located on both sides of the substantially central part of the bobbin. And
The primary winding or the secondary winding wound around another winding frame other than the substantially central winding frame is entangled with pins implanted in the collars located at both ends of the bobbin. ,
The transformer according to claim 1.   2. The transformer according to claim 1, wherein all of the primary winding and the secondary winding are entangled with pins that are implanted in flanges located at both ends of the bobbin.   The transformer according to any one of claims 1 to 3, wherein a primary winding is wound on the outermost reel among the plurality of reels.   Of the plurality of flanges, a protrusion is provided on one of the flanges located between the primary winding and the secondary winding, and the secondary winding wound around the pin is hooked on the protrusion and wound around the winding frame. The transformer according to any one of claims 1 to 4, wherein the winding direction of the secondary winding is reversed by turning.

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