JPH05315159A - High-voltage transformer - Google Patents

Abstract

PURPOSE:To miniaturize a transformer without influencing the step-up ratio by setting the thicknesses of the insulating pipe of a bobbin by steps in response to the potential values shared by each coil of a high-voltage coil and setting the coiling number of each coil in reverse proportion to the thickness of the insulating pipe. CONSTITUTION:A bobbin 12 provided on a high-voltage transformer 11 is permitted to set the depths of grooves 61-65 formed in lines on a pipe 12A by steps and the pipe thicknesses which fix the insulating distances between the coils 51-55 and a leg 1a are permitted to be thicker for the coil which has higher potential. The coiling number is set larger for the coil which has lower potential according to the coil storing capacity due to the depths of the grooves 61-65. Thus, the step-up ratio is increased without increasing the sizes of the transformer and the transformer is miniaturized for the same step-up ratio.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a primary voltage of 3 KV-1.
The present invention relates to a high voltage transformer that boosts a secondary voltage of about 0 KV.

[0002]

2. Description of the Related Art Generally, in a high-voltage transformer, a winding is wound around a core via a bobbin, and the bobbin insulates the core from the winding. In this case, in particular, the high-voltage winding is usually divided into a plurality of series-connected winding parts that share the high-voltage output. FIG. 4 shows a conventional high-voltage transformer in which a primary winding and a secondary winding are separately wound around both legs of a core, and a core 1 is wound with each of primary and secondary windings described later. It is formed in a quadrangle composed of both leg portions 1a and 1a and upper and lower laterally-provided portions 1b and 1c which are connected to each other. Then, bobbins 2 and 3 made of an insulating material are mounted around the respective leg portions 1a and 1a as shafts. The bobbin 2 is wound with a primary winding 4 (hereinafter, referred to as a low voltage winding), and the bobbin 3 is wound with a secondary winding 5 (hereinafter, referred to as a high voltage winding).

The bobbin 3 around which the high-voltage winding 5 is wound has a cylindrical portion 3A in which a collar portion 3a in contact with the upper horizontal portion 1b and a collar portion 3b in contact with the lower horizontal portion 1c are connected to each other. Number of grooves 6 ₁ , 6
_2, 6 _3, 6 _4, 6 ₅ flange portion 3c to form a ... are formed. The collar portion 3a has a thickness along the extending direction of the leg portion 1a larger than that of the other collar portions 3b and 3c.
The thicknesses of b and 3c are made substantially equal.

The high-voltage winding _{5 is} housed in the grooves 6 _{1 to} 6 ₅ by being divided into winding portions 5 ₁ , 5 ₂ , 5 ₃ , 5 ₄ , and 5 ₅ , respectively. The winding parts 5 _{1 to} 5 ₅ are connected in series and share the high voltage output generated in the high voltage winding 5. Here, the lead end from the winding part 5 ₅ housed in the uppermost groove 6 ₅ is connected to the takeout terminal 8 as a high-voltage output terminal, and the winding part 5 ₁ housed in the lowermost groove 6 ₁ is connected. The lead end from is connected to the ground terminal as a common potential point. As a result, the uppermost winding portion 5 ₅ shares the highest potential region of high-voltage output, and the lowermost winding portion 5 ₁
Will share the lowest potential region of the high voltage output.

Between the high voltage winding 5 and the low voltage winding 4,
The mold 7 is filled. The high-voltage transformer as described above requires insulation between the high-voltage winding 5 and the core 1 and between the high-voltage winding 5 and the low-voltage winding 4, and the high-voltage winding 5 and the core 1 are insulated by the bobbin 3, The voltage winding 5 and the low voltage winding 4 are insulated by a mold 7 filled in a predetermined space.

Here, each part of the core 1 and each winding part 5 _{1 to} 5
Relates insulation between _5, the insulation distance between the leg portions 1a and winding section 5 _{1-5 5} is determined by the distance d ₁ from the bottom of each groove 6 _{through 65} to the leg portion 1a. This distance d ₁ corresponds to the tube thickness of the tube portion 3A (hereinafter referred to as the insulating tube thickness). In addition, the winding portion 5 ₅ and the upper horizontal portion 1 that share the highest potential region
The insulation distance from b is also d ₁ . Moreover, the insulation distance between the most winding section 5 ₁ to share the low potential region and the lower horizontal portion 1c is determined by the thickness d ₂ of the lowermost flange portion 3b, d ₁
Has been made smaller. The reason why the uppermost collar portion 3a is thicker than the other lower collar portions 3b is that a large insulation distance is required between the winding portion 5 ₅ sharing the highest potential region and the upper horizontal portion 1b. by.

By dividing the high-voltage winding 5 into a plurality of parts, the distributed capacitance between the winding parts 5 _{1 to} 5 ₅ is reduced and the reduction of the inductance of the high-voltage winding 5 is avoided.

[0008]

In the conventional high voltage transformer, the size of the bobbin 3 and the high voltage winding 5 centering around the leg 1a on which the high voltage winding 5 is mounted is the size of the entire high voltage winding 5 in the radial direction. It is substantially determined by the number of turns and the insulating cylinder thickness of the cylindrical portion 3A, and the insulating cylindrical thickness is determined by the distance to the leg portion 1a required for the winding portion 5 ₅ which shares the highest potential region, so that the boosting rate can be increased. Therefore, as the number of windings is increased and the output is made higher, the high-voltage transformer becomes larger due to the synergistic effect of the increase in the cylinder thickness and the winding diameter of the bobbin 3.

It is an object of the present invention to provide a high voltage transformer capable of increasing the number of turns and increasing the boosting rate without increasing the size in the radial direction centering on the core leg.

[0010]

According to the present invention, the insulation cylinder thickness of the bobbin is set stepwise in accordance with the potential value shared by each winding part of the high voltage winding, and the number of turns of each winding part is the above-mentioned insulation. It is characterized by being set in inverse proportion to the cylinder thickness.

[0011]

The present invention utilizes the fact that, of the winding parts formed by dividing the high-voltage winding in series, the winding part that shares a lower potential can have a smaller insulation distance from the core, so that the cylinder thickness of the bobbin can be reduced. It is set stepwise according to the shared potential of each winding part, so that as the winding thickness is made smaller and the low potential is shared, more windings are distributed and the radial size at the center of the leg is made smaller. is doing.

Therefore, if the number of turns of the winding portion sharing the highest potential region is constant, it is possible to set a larger number of windings in the winding portion sharing the low potential, thereby increasing the total number of windings.
It is also possible to increase the boost rate without increasing the transformer size.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to an embodiment shown in FIG. The high-voltage transformer 11 shown in FIG. 1 has basically the same structure as the conventional one, and a high-voltage winding 5 and a low-voltage winding 4 are separately wound around opposing legs 1a of a quadrangular core 1. The high voltage winding 5 is divided into five series windings.

The high voltage transformer 11 of the present invention is different from the conventional one in the shape of the bobbin 12. That is, the bobbin 12 in the high-voltage transformer 11 of the present embodiment is set to a multi-row groove formed 6 _{through 65} of the depth in the cylindrical portion 12A stepwise, each coil portion 5 ₁ to 5 ₅ and the leg portion The cylinder thickness that determines the insulation distance from 1a is made larger as the winding portion shares a higher potential. Then, according to a difference in winding storage volume according to the depth variation of the groove 6 _{through 65,} are set turns as windings unit to share the low potential are many.

As in the conventional case, the insulation distance between the upper horizontal portion 1b and the winding portion 5 ₅ which shares the highest potential region is secured by the collar portion 12a having a large thickness and the lower horizontal portion 1c. The insulation distance from the winding part 5 ₁ that shares the lowest potential region is
It is secured by the lowermost collar portion 12b. Further, the lead terminal from the winding portion 5 ₅ is connected to the lead terminal 8, and the lead end from the winding portion 5 ₁ is connected to the ground end.

According to the high-voltage transformer 11 having such a configuration, the winding portions 5 _{5 to} 5 ₁ have the same outer position in the radial direction around the leg portion 1 a, but the number of turns is a winding portion sharing a low potential. Can be increased. Therefore, the winding diameter to reduce the number of turns of the winding unit 5 ₅ to share the highest potential region is subtracted from the conventional number of turns, the winding portion 5 ₂ to share the sequential low potential amount that turns is reduced, 5 _By allocating to ₃ ..., the total number of turns of the high-voltage winding 5 is the same as the conventional one, and the radial size of the high-voltage winding 5 centered on the leg portion 1a can be reduced. The transformer size can be reduced without reducing the boost rate.

FIG. 2 shows a second embodiment of the present invention. Instead of forming the collar portion 3c on the cylindrical portion 12A of the bobbin 12, a mold 7 for insulating the low voltage winding 4 and the high voltage winding 5 is used. The winding parts 5 _{5 to} 5 ₁ are separated. That is, in this embodiment, the groove 6 _{through 65} come together in the embodiment of FIG. 1, the cylindrical portion 12A is sequentially insulation tube thickness from the uppermost portion of the winding unit that shares the highest potential region is disposed It has a small step-like shape. At the time of winding, a temporary collar portion 3C is provided, the collar portion is removed after the winding is completed, and the mold 7 is extracted to form an insulating portion between the winding portions. And the cylindrical portion 12A
The above-mentioned uppermost step portion of the collar portion 1 that insulates from the upper horizontal portion 1b.
2a are connected in series, and the lower horizontal portion 1 is attached to the lowermost cylindrical portion 12A.
A collar portion 12b for insulating from c is provided in series.

With such a configuration, the same as in the previous embodiment
The winding part 5_FiveBy reducing the number of turns of the
Number can be distributed to the low-potential winding part,
The radial size can be reduced. Figure 3 is the main
A third embodiment of the present invention is shown, and the winding portion 5 in the embodiment of FIG.
_FiveThe number of turns of the
Part 5_Four~ 5₁The number of turns of the groove 6_Five~ 6 ₁Insulation tube thickness
Increase the number of turns according to the decrease, and increase the total number of turns
It is a thing.

According to the high voltage transformer 11 of the above embodiment,
The winding diameter of the winding unit 5 _5, since it smaller than the winding unit 5 ₅ in FIG. 4, the radial size L ₂ of the legs 1a, FIG. 4
In this case, the size is smaller than the radial size L ₁ and L ₂ <L ₁ . Therefore, in the case of this embodiment, the leg portion 1
The size of a in the radial direction is the same as the conventional size, and it is possible to provide a transformer in which only the boosting rate is increased.

As described above, according to the present invention, in the conventional high-voltage transformer, the insulating cylinder thickness of the bobbin 3 is the same for the winding portion which shares high potential and the winding portion which shares low potential. This is to eliminate waste due to the insulation cylinder thickness being secured more than necessary in the winding part that shares the above.

[0021]

As described above, according to the present invention, the insulating cylinder thickness of the bobbin is set stepwise in accordance with the potential value shared by each winding portion, and the number of turns of each winding portion is set to the insulating cylinder thickness. Since it is set in inverse proportion to, the number of turns can be distributed to the low-potential winding part, and the boost rate can be increased without increasing the transformer size, or the transformer size can be reduced with the same boost rate. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a high-voltage transformer according to the present invention.

FIG. 2 is a configuration diagram of a high voltage transformer according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a high voltage transformer according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional high-voltage transformer.

[Explanation of symbols]

1 ... core, 2,3 ... bobbins, 4 ... low-voltage winding, 5 ... high voltage winding (5 ₁ to 5 ₅ ... winding unit), 6 _{through 65} ... groove, 11 ... high-voltage transformer, 12 ... bobbin, 12A ... Cylinder part.

Claims (1)

[Claims] 1. A high-voltage transformer in which a high-voltage winding composed of a plurality of winding portions that are divided and connected in series is arranged in the center of a leg portion of a core via a bobbin, wherein each of the winding portions includes:
A high-voltage transformer characterized in that the insulating cylinder thickness of the bobbin is set stepwise according to the potential value to be shared, and the number of turns of each winding part is set in inverse proportion to the insulating cylinder thickness.