RU2537953C1 - High-voltage rectifier transformer - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device assembled as per the three-phase bridge rectifying scheme contains additionally a dielectric rod installed in the centre of the three-phase transformer with thread surface at a loose end and a nut fixing in series the first collecting washer, the first high-voltage capacitor, a metal washer, the second high-voltage capacitor, the second collecting washer as well as dielectric centring washers, which are mounted in the central cylindrical openings of the collecting washers and metal washer. At that thickness of the dielectric centring washers corresponds to thickness of the collecting washers and metal washer, wherein they are mounted. Beginnings of the secondary windings are wye-connected by the metal washer, while ends of the secondary windings with respective anodes of semiconductor rectifiers in the cathode group and cathodes of semiconductor rectifiers in the anode group are soldered. The cathodes of semiconductor rectifiers in the cathode GROUP are connected by the second collecting washer.

EFFECT: improving breakdown strength of the device.

3 cl, 4 dwg

Description

The invention relates to the field of electronics and can be used in the design of high-voltage small-sized rectifiers for powering powerful electronic equipment.

Closest to the proposed technical solution is a high-voltage rectifier transformer (Patent RU for utility model No. 123576, IPC: H02M 7/04, 2012), containing the upper and lower horizontal panels, a magnetic core placed between them, made of a spatial, consisting of clamped two parallel yokes of three equidistant rods, each rod is covered by concentric primary and secondary windings, semiconductor valves connected in pairs in series, placed on racks, fixed s on the side walls of the cup-insulators.

The disadvantage of this transformer - high-voltage rectifier is its low reliability for electrical breakdown in the load, leading to an uneven distribution of potentials along sections of the transformer - rectifier high-voltage relative to zero potential.

The technical result of the proposed solution is aimed at improving the reliability of the device for breakdown.

The achievement of the technical result is provided by a change in the design of the closest analogue. The inventive high-voltage rectifier transformer, assembled according to a three-phase bridge rectification circuit, further comprises a dielectric rod mounted in the center of the three-phase transformer, made with a threaded surface on the loose end and a nut fixing the first collector washer, the first high-voltage capacitor, the metal washer, sequentially a second high voltage capacitor, a second collector washer, and also dielectric centering washers, which are installed central cylindrical hole and the collector metal washers. The thickness of the dielectric centering washers corresponds to the thickness of the collector washers and the metal washer in which they are installed. High voltage capacitors are made in the form of washers with an outer diameter of their outer metallized layers of at least the outer diameter of the collector and metal washers in contact with them. The anodes of the semiconductor valves of the anode group are connected by means of a first collector washer. The beginnings of the secondary windings are connected in a star pattern using a metal washer, and the ends of the secondary windings with the corresponding anodes of the semiconductor valves of the cathode group and the cathodes of the semiconductor valves of the anode group are soldered. The cathodes of the semiconductor valves of the cathode group are connected by means of a second collector washer.

The invention is illustrated by drawings.

Figure 1 - transformer rectifier high voltage;

Figure 2 - dielectric rod mounted on it with high voltage capacitors, collector, metal and dielectric centering washers;

Figure 3 is a first sectional view of a high voltage capacitor;

Figure 4 is a second type of high-voltage capacitor in section.

The high-voltage rectifier transformer contains:

- three-phase transformer, including a spatial magnetic circuit, consisting of three equidistant rods 1 clamped by two parallel yokes (not shown) (Figure 1). Each core 1 of the magnetic circuit is surrounded by concentrically located primary 2 (Figure 1) and one or more secondary 3 (Figure 1) windings in the form of multi-turn coil sections;

- semiconductor valves 4 (Figure 1), placed between the rods 1 of the magnetic circuit, included in the transformer circuit according to a three-phase bridge rectification circuit, forming together with the secondary windings 3 one or more sections of a high-voltage rectifier transformer. The number of sections of the high-voltage transformer-rectifier is selected based on the required total output voltage of the high-voltage transformer-rectifier;

- a dielectric rod 5 (Fig. 1, 2) installed in the center of a three-phase transformer, made with a threaded surface 6 (Fig. 2) at the loose end and a nut 7 (Fig. 1, 2), fixing the elements on it. The height of the dielectric rod 5 is selected no more than the height of the rods 1 of the magnetic circuit, taking into account the number of sections of the high-voltage transformer-rectifier that are installed on it;

- the first 8 (Figure 2) and second 9 (Figure 2) collector washers and a metal 10 (Figure 2) washer made in the form of disks with central cylindrical holes mounted on a dielectric rod 5;

- the first 11 (Figure 2), second 12 (Figure 2) and third 13 (Figure 2) dielectric centering washers installed in the central cylindrical holes of the first collector washer 8, the metal washer 10 and the second collector washer 9, fixing their placement on a dielectric rod 5. Dielectric centering washers are made with an outer diameter commensurate with the diameter of the central cylindrical holes of the collector and metal washers 10, and with a diameter of the holes corresponding to the diameter of the dielectric rod 5. Thickness of dielectric prices riruyuschih washers corresponds to the thickness of the collector washers and metal washers 10 in the central holes of which they are mounted;

- high-voltage capacitors 14 (Figure 2), made in the form of washers mounted on a dielectric rod 5 between the first collector washer 8, the metal washer 10 and the second collector washer 9 as insulators, eliminating their short circuit between themselves and the breakdown. High voltage capacitors 14 can be made based on printed circuit board technology and two types are selected. The first type (FIG. 3) of the high-voltage capacitor 14 can be made, for example, four-layer, and the inner metallized layers 15 (FIG. 3) are connected to the outer metallized layers 16 (FIGS. 3, 4) by blind vias 17 to reduce capacitance losses ( Figure 3) with a protective layer of the dielectric 18 (Figure 3) to eliminate interlayer breakdown, and the second type (Figure 4) of the high-voltage capacitor 14 is two-layer. The outer diameter of the outer metallized layers 16 of the high-voltage capacitors 14 is made not less than the outer diameter of the collector and metal washers 10 in contact with the high-voltage capacitors 14 to prevent the formation of surge points on the high-voltage capacitors 14 and to prevent their destruction due to non-ideal flatness of the surfaces formed in the manufacture of the collector washers, for example, by spot welding, and a metal washer 10, made, for example, by stamping.

The type of high-voltage capacitor is selected based on the required linear distribution of potentials along the sections of the high-voltage transformer-rectifier relative to the zero potential and ensuring uniform distribution of semiconductor valves with their corresponding secondary windings.

In the section of the high-voltage transformer-rectifier are connected:

- anodes of semiconductor valves 4 of the anode group through the first collector washer 8;

- the beginning of the three secondary windings 3 according to the "star" scheme by means of a metal washer 10, made, for example, flat with grooves for desoldering the terminals of the secondary windings 3;

- the ends of the secondary windings 3 with the corresponding anodes of the semiconductor valves 4 of the cathode group and the cathodes of the semiconductor valves 4 of the anode group by soldering;

- cathodes of semiconductor valves 4 of the cathode group through the second collector washer 9.

The collector washers are, for example, three-layer, consisting of outer metal layers in the form of plates and an inner metal layer made with grooves whose thickness corresponds to the thickness of the terminals of the semiconductor valves 4 interacting with them.

The following elements are sequentially arranged on the dielectric rod 5:

- the first manifold washer 8 with a first dielectric centering washer 11 mounted in its central cylindrical hole;

- the first high voltage capacitor 14;

- a metal washer 10 with a second dielectric centering washer 12 mounted in its central cylindrical hole;

- the second high voltage capacitor 14;

- a second manifold washer 9 with a third dielectric centering washer 13 mounted in its central cylindrical hole.

If there are more than one high-voltage rectifier transformer sections, the electrical connection between them is through a second collector washer 9, connecting the cathodes of the semiconductor valves 4 of the cathode group of the previous section of the high-voltage transformer rectifier and the anodes of the semiconductor valves 4 of the anode group of the next section of the high-voltage transformer-rectifier.

Elements on the dielectric rod 5 are fixed by a nut 7, interacting with the threaded surface 6 of the dielectric rod 5 and ensuring their reliable fixation.

The assembly of the high voltage transformer rectifier is as follows.

A three-phase transformer is assembled, in which each core 1 of the magnetic circuit is covered by the primary winding 2 and the secondary windings 3 concentrically arranged on them, the number of which corresponds to the number of sections of the high-voltage rectifier transformer.

Install the dielectric rod 5 in the center of a three-phase transformer.

Connect the terminals of the primary windings 2 of the three-phase transformer according to the "star" scheme.

Assemble section of the high-voltage transformer-rectifier:

- place the semiconductor valves 4 between the rods 1 of the magnetic circuit;

- connect the anodes of the semiconductor valves 4 of the anode group to each other with the first collector washer 8, installing it on the dielectric rod 5. Install the first dielectric centering washer 11 in the central cylindrical hole of the first collector washer 8. Place the first high-voltage capacitor 14 on the dielectric rod 5 over the first collector washer 5 8;

- connect the beginnings of the three secondary windings 3 with each other according to the "star" pattern, soldering them into the grooves of the metal washer 10, which is mounted on the dielectric rod 5 over the first high-voltage capacitor 14. Install the second dielectric centering washer 12 in the central cylindrical hole of the metal washer 10. Place the second a high voltage capacitor 14 on a dielectric rod 5 over a metal washer 10;

- connect the ends of the secondary windings 3 with the corresponding anodes of the semiconductor valves 4 of the cathode group and the cathodes of the semiconductor valves 4 of the anode group by soldering;

- connect the cathodes of the semiconductor valves 4 of the cathode group to each other by means of a second collector washer 9, which is mounted on a dielectric rod 5 over the second high-voltage capacitor 14. Install the third dielectric centering washer 13 in the central cylindrical hole of the second collector washer 9.

Connect the sections of the high-voltage transformer-rectifier to each other, if there are more than one, by means of a second collector washer 9, connecting the cathodes of the semiconductor valves 4 of the cathode group of the previous section of the high-voltage transformer-rectifier with the anodes of the semiconductor valves 4 of the anode group of the next section of the high-voltage transformer-rectifier.

The elements are fixed on the dielectric rod 5 by means of a nut 7 interacting with the threaded surface 6 of the dielectric rod 5.

The assembled high-voltage transformer-rectifier is clamped with two parallel yokes.

Claims (3)

1. High-voltage rectifier transformer containing a three-phase transformer, including a spatial magnetic circuit made of three equally spaced rods, clamped by two parallel yokes and concentrically covered by the primary and one or more secondary windings, semiconductor valves connected in pairs - in series, characterized in that it is assembled by three-phase bridge rectification circuit, further comprises a dielectric rod mounted in the center of the three-phase transformer, made with re with a flange surface on the loose end and a nut fixing the first collector washer, the first high-voltage capacitor, the metal washer, the second high-voltage capacitor, the second collector washer, and dielectric centering washers that are installed in the central cylindrical holes of the collector and metal washers centering washers are made with an outer diameter commensurate with the diameter of the central cylindrical holes of the collector and metal washers, and the diameter of the holes corresponding to the diameter of the dielectric rod, while the thickness of the dielectric centering washers corresponds to the thickness of the collector and metal washers in which they are installed, high-voltage capacitors are made in the form of washers with an outer diameter of their outer metallized layers of at least the outer diameter of the collector and metal the washers in contact with them, the anodes of the semiconductor valves of the anode group are connected by means of the first collector washer, the beginning of the secondary k are connected according to the “star” scheme by means of a metal washer, and the ends of the secondary windings with the corresponding anodes of the semiconductor valves of the cathode group and the cathodes of the semiconductor valves of the anode group are soldered, the cathodes of the semiconductor valves of the cathode group are connected by the second collector washer. 2. The high-voltage rectifier transformer according to claim 1, characterized in that the collector washers are made of three layers, consisting of outer metal layers in the form of plates and an inner metal layer made with grooves whose thickness corresponds to the thickness of the terminals of the semiconductor valves interacting with them. 3. The high-voltage rectifier transformer according to claim 1, characterized in that the metal washer is made flat with grooves.

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