JP2004087659A - High voltage transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high voltage transformer capable of stably lighting a plurality of discharge lamps, and realizing sharp miniaturization and cost reduction. <P>SOLUTION: A high voltage transformer 11 is configured as an inverter transformer for lighting two CFL at the same time, and a primary coil (45) and secondary coils (46, 47a, b) constituted of two conductors are wound around a bar-shaped magnetic core 30. The secondary coils (46, 47a, b) are constituted of a common coil (46) around which two conductors are commonly wound and independent coils (47a, b) around which two conductors are independently wound. The conductors whose wounding operation is not carried out concerning the seconds 47a, b are made to pass while insulated between the conductors whose wounding operation is carried out so as to be buried in a groove scored on the button wounding surface of the sections 47a, b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-voltage transformer used for a lighting circuit of a backlight discharge lamp in a liquid crystal display panel, for example, and particularly to a high-voltage transformer used for a DC / AC inverter circuit.
[Prior art]
2. Description of the Related Art Conventionally, for example, a plurality of cold-cathode discharge lamps (hereinafter, referred to as CFLs) for backlighting various liquid crystal display panels used in a notebook computer or the like are simultaneously discharged and lit. I have. By using several or more CFLs in this way, it is possible to meet demands for higher luminance and uniform illumination of a liquid crystal display panel.
As a circuit for lighting this type of CFL, an inverter circuit that converts a DC voltage of about 12 V to a high-frequency voltage of about 1600 V at 60 kHz using a high-voltage transformer and starts discharging is generally used. After the start of the discharge, the inverter circuit controls the high frequency voltage to be reduced to about 600 V required for maintaining the discharge of the CFL.
[0002]
As the high-voltage transformer (inverter transformer) used in such an inverter circuit, a small-sized one is used in order to reduce the thickness of the liquid crystal display panel, but the number of the CFLs per one liquid crystal display is increased. Therefore, there is an urgent need to establish a technology for further saving space and reducing manufacturing costs. As a device that responds to such a request, a device described in, for example, JP-A-2001-267156 is known.
[0003]
The inverter transformer disclosed in this publication is capable of lighting a plurality of CFLs with one transformer and suppressing variations in the discharge operation of each CFL. As shown in FIG. Two secondary windings 2 (each outputting a high-frequency voltage to a corresponding CFL) are coupled to the winding 1 so as to be electromagnetically equivalent to each other. Each of the secondary windings 2 is individually wound around a rod-shaped magnetic core 3 made of a soft magnetic material such as ferrite. The rod-shaped magnetic core 3 is electromagnetically coupled to the primary winding 1. ing. Further, each secondary winding 2 is wound along the axis of the bar-shaped magnetic core 3 and is divided into a plurality of sections in the axial direction to prevent dielectric breakdown caused by generation of a high voltage. An insulating partition plate 4 is provided between the sections to maintain a creeping distance required for preventing creeping discharge.
[0004]
Each secondary winding 2 is actually wound around the outer periphery of a cylindrical bobbin 5, and the rod-shaped magnetic core 3 is fitted inside the bobbin 5. The primary winding 1 is also wound around a cylindrical bobbin 6, and the primary winding bobbin 6 is formed so that the lower end portion of the rod-shaped magnetic core 3 in the drawing can be inserted. Further, a primary winding terminal block 7 and a secondary winding terminal block 8 are provided.
[0005]
According to the technology described in the publication configured as described above, the inverter transformer does not increase in a one-to-one relationship with the number of loads, and therefore, the overall configuration is smaller in size and lower in cost than the conventional one. There is an effect that can be obtained.
[0006]
[Problems to be solved by the invention]
However, in the technology described in the above-mentioned publication, the rod-shaped core for winding the secondary winding has a number corresponding to the number of loads, although the size and cost are smaller than those of the conventional technology. Therefore, miniaturization and cost reduction have not been sufficient.
[0007]
Further, since a plurality of rod-shaped magnetic cores for winding the secondary winding are arranged, it is not always easy to make the plurality of secondary windings electromagnetically equivalent to each other. This has been an obstacle in reducing costs.
[0008]
The present invention has been made in view of such circumstances, and a high-voltage transformer capable of stably discharging and lighting a plurality of discharge lamps with a single transformer and capable of significantly reducing the size and cost. The purpose is to provide.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the high-voltage transformer of the present invention transforms one AC voltage input applied to the primary winding and outputs a predetermined AC voltage output from each of the plurality of secondary windings. In a high-pressure transformer that generates
The plurality of secondary windings are wound around a single winding shaft, and the winding region of the secondary winding is divided into a plurality of sections arranged in the axial direction of the winding shaft by an insulating partition plate. Split,
In the section on the low voltage side among the sections, the plurality of secondary windings are wound around the same section,
In the section on the high voltage side among the sections, each of the plurality of secondary windings is wound around a corresponding section.
[0010]
Here, the terms "low-voltage side" and "high-voltage side" are used relatively, and their boundary is whether or not dielectric breakdown can occur between a plurality of secondary windings. And the boundary value can be set as appropriate according to the situation.
[0011]
Further, the plurality of secondary windings include first and second two windings, and the plurality of sections include a section around which the first winding is wound and a second winding. Can be configured to be alternately arranged with the section to be wound.
[0012]
Further, each of the high-voltage side sections is configured to have a groove portion that allows a winding other than a predetermined winding wound around the section to pass therethrough insulated from the predetermined winding. Is preferred.
[0013]
In addition, the groove is formed on the surface of the winding shaft in each of the sections, between the two insulating partition plates located on both sides,
A winding other than the predetermined winding may be buried in the groove to perform insulation between the predetermined winding wound on the surface of the winding shaft. is there.
[0014]
Further, in each of the sections, the groove is engraved on the outer peripheral surface of the two insulating partition plates located on both sides,
Windings other than the predetermined winding are inserted into these grooves, stretched between two insulating partition plates, and are disposed between the predetermined winding wound on the surface of the winding shaft. It is possible to configure so that an insulating process is performed.
[0015]
The core of the winding shaft is preferably formed of ferrite, but may be formed of other general core materials such as sendust and dust core.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a high-voltage transformer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 illustrate a schematic configuration of a high-voltage transformer according to a first embodiment of the present invention. FIG. 1A is a top view, and FIG. 2A is a partial side view, and FIG. 2B is a cross-sectional view taken along a line BB shown in FIG.
[0017]
The high-voltage transformer 11 of the present embodiment is an inverter transformer used in a DC / AC inverter circuit for simultaneously discharging and lighting two CFLs (cold cathode discharge lamps), and is made of a soft magnetic material such as ferrite. A primary winding (section 45) and a secondary winding (sections 46, 47a, b) composed of two conductors are wound around the rod-shaped magnetic core 30. The secondary winding (sections 46, 47a, b) includes a common winding portion (section 46) in which two conductors are wound in common and an independent winding in which two conductors are separately wound. The primary winding (section 45) and the secondary winding (sections 46, 47a, b) are electromagnetically separated from each other by the common rod-shaped core 30. Are combined.
[0018]
The secondary windings (sections 46, 47a, b) are wound along the axis of the bar-shaped core 30, but prevent a high voltage difference between adjacent windings from causing dielectric breakdown. In order to prevent the creeping discharge, a plurality of sections 46, 47a, b are divided in the axial direction, and insulating partition plates 42, 43 are provided between the sections 46, 47a, b. Distance is maintained. An insulating partition plate 44 is also provided between the primary winding (section 45) and the secondary winding (sections 46, 47a, b).
[0019]
The primary winding (section 45) and the secondary winding (sections 46, 47a, b) are actually wound around the outer periphery of the cylindrical bobbin 21 having a rectangular cross section, and the rod-shaped magnetic core 30 is formed. Is fitted inside the bobbin 21. In addition, flange plates 41a and 41b are provided on both end surfaces of the bobbin 21.
[0020]
The rod-shaped magnetic core 30 is electromagnetically coupled to a frame-shaped magnetic core 29 formed of the same material as the rod-shaped magnetic core 30, thereby forming a magnetic path.
However, the gap amount between the rod-shaped magnetic core 30 and the frame-shaped magnetic core 29 is determined by how much leakage magnetic flux is generated, and this gap amount can be made substantially zero. Also, without providing the frame-shaped magnetic core 29, the magnetic core may be constituted only by the rod-shaped magnetic core 30, and may be formed in a completely open magnetic circuit structure.
[0021]
The starting end of the primary winding (section 45), the intermediate terminal (can be omitted; the intermediate terminal is omitted in the circuit of FIG. 6 described later), and the end are connected to the winding terminal block 27. The starting ends of the secondary windings (sections 46, 47a, b) are connected to the terminal pins 17b to 17d held and fixed, and the terminal pins 17a, e held and fixed to the terminal block 27 for winding. On the other hand, the terminal ends are connected to terminal pins 18a and 18b held and fixed to the winding terminal block 28. These terminal blocks 27 and 28 are formed from an insulating material. In addition, the connection mode of the start and end of the primary winding (section 45) and the secondary winding (sections 46, 47a, b) to the terminal pins 17a to 17e, 18a, b is not limited to this. Absent.
[0022]
As described above, the high-voltage transformer 11 of the present embodiment discharges and lights two CFLs at the same time, and the secondary winding (sections 46, 47a, b) winds two conductive wires. It is composed of Each of the sections 46, 47a and b around which the secondary winding is wound has a common winding portion (three sections 46) on the low voltage side where two conductors are wound in common, and two sections. Are composed of independent winding portions on the high voltage side (three sections 47a, b for each conductor) wound separately.
[0023]
As described above, in the present embodiment, two conductors for discharging and lighting each CFL are wound around one rod-shaped magnetic core 30 via the bobbin 21, and thereby a plurality of conductors are formed. It is possible to greatly promote downsizing of a high-voltage transformer for discharging and lighting a discharge lamp and reduction in manufacturing cost.
[0024]
Moreover, in the present embodiment, each section 46, 47a, b around which the secondary winding is wound is distinguished into a common winding portion (section 46) and an independent winding portion (sections 47a, b). On the low voltage side where there is no risk of dielectric breakdown between the two conductors, these two conductors are wound in common to save space, while the timing of the discharge and lighting of the two CFLs When there is a time difference between the two conductors, two conductors are separately wound on the high voltage side where there is a risk of dielectric breakdown between the two conductors.
[0025]
In the independent winding portions (sections 47a and 47b) where the two conductors are separately wound, a secondary winding (section 47a) for winding the first conductor and a second winding are wound. Secondary windings (sections 47b) to be turned are alternately arranged along the winding axis, and the insulation between the conductors wound around the sections 47a and 47b and the conductors 47a and 47b not wound around the section. Are provided so that the wire can be satisfactorily held, and the conductor can be wound by using an automatic winding machine or the like.
[0026]
3 and 4 are views for explaining the schematic configuration of the bobbin 21 of the high-voltage transformer according to the first embodiment. FIG. 3 (a) is a top view, FIG. 3 (b) is a bottom view, and FIG. 4) is a side view, and FIG. 4 is a perspective view of a main part.
[0027]
As shown in the figure, the partition plate 42 separating the three sections 46 in the common winding portion is provided with a groove portion 50 cut out in the radial direction of the winding shaft up to a substantially bobbin winding surface. The partition plate 43 for separating the common winding section (section 46) and the independent winding section (sections 47a, b) and the partition plate 43 for separating the six sections 47a, b in the independent winding section include: At two positions separated from each other by a predetermined angle in the circumferential direction of the bobbin, a groove 49 is provided in the radial direction of the bobbin, which is cut out to a position deeper than the bobbin winding surface. Further, grooves 51 are engraved on the bobbin winding surfaces of the sections 47a and 47b so as to diagonally connect the grooves 49 of the adjacent partition plates 43. The groove 49 may be formed in parallel with the axis of the winding shaft. However, as in the present embodiment, the groove 49 is inclined with respect to the axis and passes through the corner of the bobbin 21. Then, when the conductor is embedded in the groove as described later, it is easy to apply an appropriate tension to the conductor.
[0028]
As described above, two conductors are wound together with respect to the three sections 46 in the common winding portion, and when the winding operation of one section 46 is completed, the partition plate The winding operation of the next section 46 is performed by the two conductive wires passed through the groove 50 of 42. Then, when all the winding operations of the three sections 46 are completed, the operation of winding the conductive wires of the six sections 47a and 47b in the independent winding portion is started.
[0029]
The wire winding operation of the six sections 47a, b in the independent winding portion is performed by winding the first wire for the three sections 47a and winding the second wire for the three sections 47b. Done. That is, the winding operation of the first conductor and the winding operation of the second conductor are performed alternately.
At this time, as for the conductors for which the winding operation is not performed on the sections 47a and 47b, the conductors are passed while insulated from the conductors on which the winding operation is performed, as shown in FIG. Is embedded in a groove 51 formed on the bobbin winding surface. That is, for the section 47a around which the first conductor 71a is wound, the second conductor 71b is buried in the groove 51, while for the section 47b around which the second conductor 71b is wound, the first conductor 71 a is buried in the groove 51.
[0030]
The groove 51 is formed so as to have a depth that does not come into contact with the conductors 71a and 71b wound around the sections 47a and 47b when the conductors 71a and 71b are embedded. The conductors 71a and 71b to be buried are stretched so as not to float when they are turned.
[0031]
The groove 49 formed in the partition plate 43 is formed so as to be smoothly connected to the groove 51, and at the connection portion, the conducting wires 71a, b passing through these grooves 49, 51 are connected to the other. It is formed so as to have a depth such that it does not contact the conductive wires 71a and 71b.
[0032]
FIG. 6 shows an example of a circuit in a case where two CFLs (CFL1, CFL2) are connected to the high-voltage transformer 11 described above. As shown in the figure, a high-voltage transformer 11 and a switching circuit 90 arranged at the preceding stage constitute a separately-excited inverter circuit. The switching circuit 90 includes an oscillation control IC 92 and a transistor Q. The switching circuit 90 converts an input DC voltage (for example, 12 V) into an AC voltage and applies the AC voltage to the primary winding 101. As described above, a high-frequency voltage of about 60 KHz and about 1600 V is generated independently for both of the two secondary windings 102a and 102b at the start of CFL discharge.
[0033]
As a result of this configuration, even if one of the CFLs discharges first, the output voltage of the other secondary windings 102a and 102b does not drop, and after the discharge and lighting of one CFL, the other of the secondary windings 102a and 102b is turned off. It is possible to discharge and light the CFL normally.
[0034]
7 and 8 illustrate a schematic configuration of a high-voltage transformer according to a second embodiment of the present invention. FIG. 7A is a top view of a bobbin, FIG. 7B is a bottom view of the bobbin, and FIG. 7) is a side view when viewed from the A side in FIG. 7, and FIG. 7B is a side view when viewed from the B side in FIG. The second embodiment differs from the first embodiment mainly in that the grooves 49, 50, and 51 of the common winding portion and the independent winding portion are different from each other. This will be described, and a detailed description of other parts will be omitted. In the drawings, parts corresponding to the first embodiment are represented by adding 100 to the numbering used in the first embodiment.
[0035]
As shown in the figure, the bobbin 121 of the high-voltage transformer according to the second embodiment has a primary winding (section 145) and a secondary winding composed of two conductive wires, similarly to the first embodiment. Wires (sections 146, 147a, b) are wound. Further, the secondary windings (sections 146, 147a, b) have a common winding portion (section 146) in which two conductors are wound in common, as in the first embodiment, and have two windings. Are wound independently of each other (sections 147a and 147b), and the primary winding (section 145) and the secondary winding (sections 146 and 147a and b) They are electromagnetically coupled to each other by a common rod-shaped magnetic core (not shown).
[0036]
The secondary windings (sections 146, 147a, b) are wound along the axis of the rod-shaped magnetic core 30, similarly to the first embodiment, and a plurality of sections 146, 147a are formed in the axial direction. , B, and insulating partition plates 142, 143 are provided between the sections 146, 147a, b.
[0037]
Similarly to the first embodiment, the sections 146, 147a, and b around which the secondary winding is wound include a common winding section (section 146) and an independent winding section (section 147a, 147a, 147a). b), on the low voltage side where there is no risk of dielectric breakdown between the two conductors, these two conductors are wound in common, while there is a risk of dielectric breakdown between the two conductors. At a certain high voltage side, it is considered that two conductors are separately wound.
In the independent winding portions (sections 147a and 147b), a region where the first conductor is wound (section 147a) and a region where the second conductor is wound (section 147b) are alternately arranged along the winding axis. It is arranged in.
[0038]
By the way, in the second embodiment, the insulation operation of the two conductive wires in each section 147a, b of the independent winding portion is different from that of the first embodiment. That is, the diameter of the winding shaft of the independent winding portion (section 147a) that winds the first conductor is large, and the diameter of the winding shaft of the independent winding portion (section 147b) that winds the second conductor is small. It is set as follows.
[0039]
On one side (A side) of the independent winding portion (section 147a) having a large diameter of the winding shaft, as shown in FIG. 9A, the independent winding portion (section 147b) having a small diameter of the winding shaft is provided. The groove 151 cut out to the same level as the surface height of the item (1) is formed. The groove 151 is also formed on the partition plate 143 as shown.
[0040]
On the other hand, on the other side surface (B side) of the bobbin, a shallow groove 152 is formed in each partition plate 143 as shown in FIG. 9B.
[0041]
In the independent winding portion (sections 147a and 147b) in the second embodiment, as described above, a region (section 147a) around which the first conductor is wound and a region (section 147b) around which the second conductor is wound. ) Are alternately arranged along the winding axis, so that the insulation between the conductor wound around the section 147a, b and the conductor 147a, b not wound around the section is maintained well, and The above-mentioned grooves 151 and 152 are provided so that the winding operation of the conductive wire can be performed even by using an automatic winding machine or the like.
[0042]
That is, as shown in FIG. 10A, in the section 147a in which the winding operation is performed on one of the conductors 171a, the other conductor 171b on which the winding operation is not performed is embedded in the groove 151, and By passing under one of the conductors 171a wound around the section 147a, insulation between the conductor 171a and the conductor 171a is performed.
[0043]
On the other hand, as shown in FIG. 10B, in the section 147b in which the winding operation is performed on the other conductor 171b, one of the conductors 171a on which the winding operation is not performed is stretched between the grooves 152. By passing above the other conductive wire 171b wound around the section 147b, insulation treatment with the conductive wire 171b is performed.
[0044]
The groove 151 is formed so as to have a depth that does not make contact with the conductor 171a wound around the section 147a when the conductor 171b is buried, and the conductor 171b is buried in the groove 151b. It is stretched so that it does not float inside. Further, the groove 152 is formed so as to have a depth that does not make contact with the conductor 171b wound around the section 147b when the conductor 171a is stretched. It is stretched to the extent that it does not deviate from 152.
[0045]
In the second embodiment, the manner of passing the section that is not wound is different between the two conductors 171a and 171b, and the winding operation of the conductor 171a that is to be embedded in the groove 151 is performed between the grooves 152. The winding operation of the two conductors 171a and 171b on one bobbin 121 can be performed at the same time by setting the winding operation of the conductor 171b to be stretched in advance at a predetermined timing. As a result, the manufacturing time can be reduced.
[0046]
The high-voltage transformer of the present invention is not limited to the above-described one, and various modifications can be adopted. For example, in the above-described embodiment, when two secondary windings are provided. However, instead of this, three or more secondary windings may be provided.
[0047]
Further, in the above embodiment, the sections winding different conductors are configured to be alternately arranged.However, the sections winding different conductors are not necessarily alternately or regularly arranged. In addition, the number of sections on the low voltage side and the number of sections on the high voltage side can be appropriately selected.
[0048]
In addition, various types of grooves can be adopted as the groove portion that allows windings other than the predetermined winding wound around each section to pass therethrough while being insulated from the predetermined winding. If three secondary windings are provided, the first winding depends on the type of the groove 51, the second winding depends on the type of the groove 151, and the third winding For each of the above, it is possible to perform an insulating process depending on the type of the groove 152.
[0049]
Further, the means for insulating the winding wound in the section on the predetermined high-voltage side and the winding not wound in the section is not limited to the groove portion. For example, these two windings It is also possible to interpose an insulating member between them.
[0050]
Further, as described above, the magnetic cores 29 and 30 are preferably formed of ferrite. For example, it is possible to use a material such as permalloy, sendust, or iron carbonyl. It is also possible to use a molded dust core.
[0051]
Further, the high-voltage transformer of the present invention can be applied to not only an inverter transformer but also various other transformers.
[0052]
【The invention's effect】
As described above, according to the high-voltage transformer of the present invention, the winding region of the secondary winding is divided into a plurality of sections in the axial direction of the winding shaft by the plurality of insulating partition plates. In the section on the low voltage side, a plurality of windings are wound around the same section. On the other hand, in the section on the high voltage side, each winding is wound around a section corresponding to each winding. Each section in which the secondary winding is wound is distinguished into a common winding portion on the low voltage side and an independent winding portion on the high voltage side. As a result, on the low voltage side where there is no risk of dielectric breakdown between the multiple windings, these multiple windings are wound in common to save space, while on the high voltage side, multiple windings are used. It is possible to prevent dielectric breakdown between multiple windings even when wires are wound separately and the discharge of the discharge lamp, which is a load on each winding, has a time difference in lighting timing, etc. It becomes.
[0053]
Therefore, according to the high-voltage transformer of the present invention, it is possible to stably discharge and light a plurality of discharge lamps with one transformer while significantly reducing the size and cost.
[0054]
Further, in each section on the high voltage side described above, a configuration is provided in which a groove is provided to allow a winding other than a predetermined winding wound around each section to pass therethrough insulated from the predetermined winding. This makes it possible to easily and inexpensively perform insulation treatment between the plurality of windings on the high voltage side where there is a possibility that insulation breakdown will occur between the plurality of windings.
[Brief description of the drawings]
FIG. 1A is a top view of a high-voltage transformer according to a first embodiment of the present invention, and FIG. 1B is a vertical cross-sectional view taken along line AA in FIG.
FIG. 2 is a partial side view of the high-voltage transformer according to the first embodiment of the present invention, and FIG. 2B is a vertical cross-sectional view taken along line BB in FIG.
FIG. 3 is a top view, a bottom view, and a side view of the bobbin of the high-voltage transformer according to the first embodiment of the present invention.
FIG. 4 is an essential part perspective view of a bobbin of the high-voltage transformer according to the first embodiment of the present invention.
FIG. 5 is an enlarged front view of a main part and an enlarged top view of a main part of a groove of a bobbin of the high-voltage transformer according to the first embodiment of the present invention;
FIG. 6 is a circuit diagram showing an inverter circuit including a high-voltage transformer according to the first embodiment of the present invention.
FIG. 7 is a top view (a) and a bottom view (b) of a high-voltage transformer bobbin according to a second embodiment of the present invention.
FIG. 8 is a side view (a) on the A side and a side view (b) on the B side of the bobbin of the high-voltage transformer according to the second embodiment of the present invention.
FIG. 9 is a perspective view of a main part on an A side and a perspective view of a main part on a B side of a bobbin of a high-voltage transformer according to a second embodiment of the present invention.
FIG. 10 is an enlarged view of a main part on the A side and an enlarged view of a main part on the B side (b) of the groove of the bobbin of the high-voltage transformer according to the second embodiment of the present invention.
FIG. 11 is a schematic diagram showing a high-voltage transformer according to the related art.
[Explanation of symbols]
11 High voltage transformer
17a to 17e, 18a, b,
117a to 117e, 118a, b Terminal pins
21, 121 bobbin
27, 28, 127, 128 Terminal block for winding
29 Frame-shaped magnetic core
30 bar-shaped magnetic core
41a, b, 141a, b collar plate
42, 43, 44, 142, 143, 144 Partition plate
45, 145 section (primary winding side)
46, 47a, b, 146, 147a, b section (secondary winding side)
49, 50, 51, 151, 152 Groove
71a, 171a First conductive wire
71b, 171b Second conductor
90 Switching circuit
92 Oscillation control IC
101 Primary winding
102a, b Secondary winding
CFL1, cold cathode discharge lamp

Claims (6)

In a high-voltage transformer for transforming one AC voltage input applied to a primary winding and generating a predetermined AC voltage output from each of a plurality of secondary windings,
The plurality of secondary windings are wound around a single winding shaft, and the winding region of the secondary winding is divided into a plurality of sections arranged in the axial direction of the winding shaft by an insulating partition plate. Split,
In the section on the low voltage side among the sections, the plurality of secondary windings are wound around the same section,
A high-voltage transformer, wherein a section on a high voltage side of the sections is wound around a corresponding section for each of the plurality of secondary windings. The plurality of secondary windings include first and second two windings, and the plurality of sections include a section around which the first winding is wound and a second winding. 2. The high voltage transformer according to claim 1, wherein the sections to be turned are set so as to be alternately arranged. Each of the sections on the high voltage side includes a groove portion that allows windings other than a predetermined winding wound around the section to pass therethrough insulated from the predetermined winding. Item 3. The high-voltage transformer according to item 1 or 2. The groove is engraved on the surface of the winding shaft in each of the sections, between two insulating partition plates located on both sides,
4. A winding other than the predetermined winding is buried in the groove, and insulation treatment is performed between the winding and the predetermined winding wound on the surface of the winding shaft. The high voltage transformer as described. The groove is formed in each of the sections by engraving the outer peripheral surfaces of the two insulating partition plates located on both sides,
Windings other than the predetermined winding are inserted into these grooves, stretched between two insulating partition plates, and are disposed between the predetermined winding wound on the surface of the winding shaft. 5. The high-voltage transformer according to claim 3, wherein an insulation process is performed. The high-voltage transformer according to any one of claims 1 to 5, wherein the winding core of the winding shaft is formed of ferrite.

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