SU1198581A1 - Tree voltage multiplier - Google Patents

Description

The invention relates to high-voltage technology, in particular to high-voltage power supplies of electrical and x-ray equipment. The purpose of the invention is to unify the structural elements of multipliers of different capacities. The device contains solid main electrical insulation 1, made with through holes 2, coaxially with which high voltage windings 4, magnetic core 5 passing through hole 2 of main insulation 1 and low voltage winding 6 located on magnetic core are placed inside outer lugs 3 of main insulation. High-voltage windings are connected via rectifier elements. One of the embodiments of the cascade voltage multiplier is the implementation of a closed magnetic circuit 5, the cores of which pass through adjacent holes 2 of the main insulation 1, the distance between the axes of which is equal to the distance between the axes of the cores.

In another embodiment, the cascade contains an open magnetic conductor passing through the opening 2 of the main insulation 1.

In the third variant, the cascade is made with a closed magnetic conductor, one core of which is placed in the opening 2 of the main insulation 1, and the other outside the main insulation. 1 h. n. f-ly, 5 ill.

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The invention relates to high-voltage technology, in particular to high-voltage power supplies of electrical and x-ray equipment.

The purpose of the invention is the unification of the structural elements of multipliers of different capacities. ...

In Fig. · G-5 presents a cascade voltage multiplier; in fig. 6 shows the distribution of the electric field of a high-voltage winding placed on a ribbed dielectric core with · specific resistivity an order of magnitude higher than that of the rest of the main insulation.

Cascade voltage multiplier contains solid main electrical insulation I, made with through holes 2, coaxially with which high voltage windings 4 are placed inside the outer projections 3 of the main insulation I.

In an embodiment of the cascades, the cascade voltage multiplier (Fig. I) has closed magnetic cores 5, the cores of which pass through adjacent holes 2 of the main insulation I, the distance between the axes of which is equal to the distance between the axes of the cores. In another embodiment, the cascade contains an open magnetic circuit 5 passing through the opening 2 of the main insulation 1 (Fig. 2). In the third variant, the cascade is made with a closed magnetic core 5, one core of which is placed in the opening 2 of the main insulation 1, and the other outside the main insulation (Fig. 3).

Low-voltage winding 6, located on the magnetic core 5, can be placed either in the hole 2 or outside it. In the case of passing a closed magnetic circuit 5 through adjacent holes 2 (Fig. 2), the low-voltage winding 6 is distributed over both cores, the high-voltage windings 4 are connected through rectifying elements 7, which are also located inside the main insulation 1 outside the projections 3.

Part of the main insulation 1, directly surrounding the through hole 2, can be made in the form of a ribbed frame 8, between the ribs 9 of which are located sections 10 of the high-voltage windings 4 (Fig. 4).

The resistivity of the frame material is higher than the resistivity of the material of the rest of the main insulation 1 by at least an order of magnitude. Such material can be, for example, polyethylene, which has, in addition, a low dielectric constant. The frame 8 with the sections of the winding 4 and the rectifying element 7 is then poured with a compound forming the rest of the main insulation 1.

FIG. 5 shows the field distribution of the high-voltage winding 4 layout. The calculation is performed assuming axial symmetry

fields. When calculating the sectional nature of the winding 4 is not taken into account, which practically does not introduce errors, since the voltage between sections 10 of winding 4 is much less than the voltage between winding 4 and magnetic core 5, which has zero potential. The equipotentials 11–15 are 5, 10, 25, 50, 75% voltage equipotentials of the high-voltage winding.

The device works as follows.

When an alternating voltage is applied to the low-voltage windings 6, the voltages induced in the high-voltage windings 4 are rectified by the rectifying elements 7 and are added.

The implementation of the multiplier with open magnetic circuits (Fig. 3) makes it possible to build a multiplier with minimum dimensions and mass, when a multiplier of small power is required and there are no restrictions from the point of view of electromagnetic compatibility (in this embodiment, large stray fields).

The use of closed magnetic cores 5 (Fig. 1 and 3) allows to drastically reduce stray fields and as a result of this increase the efficiency of the multiplier and improve the electromagnetic compatibility.

The placement of high-voltage windings 4 on the finned hollow frames 8 of a material with high resistivity, low dielectric constant, low specific losses and high electrical strength, for example polyethylene, and pouring them with a material with a lower, at least an order of magnitude, resistivity, for example epoxy compound forming the rest of the main insulation allows to reduce the size of the multiplier and improve the manufacturability of its manufacture, as well as reduce the parasitic capacitance of the winding OK 4 and dielectric losses in them.

Size reduction is achieved by the fact that with this choice of insulation materials, the electric field is concentrated at winding 4 (Fig. 5) and significantly weakened at the border of the outer portions of the frame 8 and the rest of the main insulation, where breakdown is most likely to develop. Favorable conditions for the development of breakdown are due to the fact that this area is in contact with air and the interface is most susceptible to atmospheric and mechanical effects, which reduce breakdown voltage along this boundary. In addition, the use of the frame 8 facilitates the sectional winding of the windings 4 and their installation inside the projections 3 coaxially holes 2.

Multiplier cascades are made

and are tested separately, and their number is selected depending on the desired output voltage.

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1198581

Claims (2)

Claim 1. The cascade voltage multiplier comprising a high voltage coil contained within the primary solid electrical insulation ₅ tion with protrusions and connected through rectifier elements among themselves low-voltage winding placed on isolated apart magnetic cores, characterized in that, in order to unify the structural elements the multiplier ¹⁰ teley different capacities, the main electrical insulation is provided with a through-hole coaxial with the high-voltage windings arranged in the projections in the holes are arranged magn toprovody. 2. The multiplier by π. 1, characterized in that the part of the main electrical insulation directly surrounding the holes is made in the form of hollow finned dielectric frames with a specific resistance at least an order of magnitude higher than the rest of the main insulation, and the high-voltage winding is made in the form of sections placed between the ribs . Aa FIG. 2 Fig.Z Fy FIG. five 1198581 6