SU1513600A1 - D.c. to a.c. converter - Google Patents

Abstract

The invention relates to conversion devices used in the technique of high currents and high voltages, mainly for supplying electrostatic precipitators with asymmetric alternating voltage. The purpose of the invention is to expand the functionality of the device due to the separate formation of forward and reverse current pulses. The device includes a housing 1 with electrodes 2-9, forming in pairs the spark gaps. Two conductive bodies 10, 11 are mounted on a dielectric disk 12 connected to the drive 13 rotating between the electrodes. Electrodes 3, 5 and 7, 9 are connected to the load. Electrodes 2 and 8 are connected to source 14, and electrodes 4 and 6 are connected to a second high voltage source 15. Such connection of the converter electrodes to voltage sources allows a separately adjustable asymmetric voltage of the direct and inverse amplitudes of any ratio between them to be formed on the load. 2 Il.

Description

3151

The invention relates to conversion devices used in the technique of high currents and high voltages, mainly for supplying electric precipitators with alternating voltage.

The purpose of the invention is to expand the functionality of the device due to the separate formation of forward and reverse current pulses.

FIG. 1 is a schematic diagram of a device for converting a direct current into an alternating current; in fig. 2 - curve of the time sweep of the voltage on the load.

The device comprises a housing 1 on which electrodes 2-9 are installed, forming in pairs spark gaps with a control unit in the form of two switching conductive bodies 10 and 11 mounted on a dielectric disk 12 connected between the electrodes and connected to the drive 3. Electrodes 2 and 8 located on opposite vertices of one of the rectangles are connected to the opposite terminals of the first high-voltage source 14, and electrodes 4 and 6 that lie on the other opposite vertices of the diagonal x of the same rectangle are connected to different The terminals of the second high-voltage source 15. The electrodes 3 and 5, 7 and 9, lying on other opposite sides of another identical rectangle, are connected to the load 16, a pair of diametrically opposite, rigidly fixed relative to each other electrodes 2, 3 and 8, 9 are installed with the possibility of angular shift relative to the other two pairs of diametrically opposed electrodes 4, 5 and 6, 7, which are also rigidly fixed relative to each other.

Spark gaps formed by pairs of electrodes 2, 3, 4, 5, 6, 7 and 8, 9 are included in the shoulders of a single-phase bridge. The first constant voltage source 14 and the load 16 are included in one of the diagonals, and the second constant voltage source 15 and the load 16 are connected to the other diagonal.

The device works as follows.

The actuator 13 rotates the dielectric disc 12 with commuting conducting bodies 10 and 11. At the time of 6004

Nor, when the conductive body 10 falls into the spark gap between the electrodes 2 and 3, and the conductive

2, the body P is in the spark gap between the electrodes 8 and 9, there is a spark gap and a discharge circuit through which current from the first source 14 flows.

0 through load 16 in the forward direction. Ignition of the remaining spark gaps between the electrodes 4-7 through the conductive bodies 10 and 11 is prevented by the dielectric disk 12, V

5, the time when the conductive body 10 falls into the spark gap between electrodes 4 and 5, and the conductive body 11 enters the spark gap between electrodes 6 and 7, the spark gaps ignite and close the discharge circuit through which the discharge current from the second source 15 through the load 6 in the opposite direction. With further rotation of the dielectric disc 12, the processes are repeated. Thus, in the device, the direct current of the first and second sources is converted into an alternating separately adjustable asymmetric current in the load of any ratio. The frequency of the current is controlled by changing the number of revolutions of the disk 12, the duration of the pulses is controlled by an angular symmetric displacement of moving pairs of electrodes 2, 3 and 8, 9 relative to fixed pairs.

electrodes 4, 5 and 6, 7, and the magnitude of the positive and negative half-voltage waves at the load is regulated separately by changing the voltage of the first and second high-voltage sources. FIG. Figure 2 shows the shape of the cyclic voltage variation at the load when the controlled electrodes 2–9 are located at the vertices of the square, with the pulses of both positive and negative polarity being the same for long CQ, but different in amplitude. The positive half-wave voltage is regulated from 0 to the maximum value by a smooth change in the output voltage of the first high-voltage source 14, and the negative half-wave is controlled by a smooth change from the O to the maximum value of the output voltage of the second high-voltage source 15.

thirty.

five

5151

The formula of the invention. A device for converting direct current into alternating current, containing a housing, on both sides of which electrodes are installed, geometrically placed vertically in a rectangle and forming four spark gaps in pairs, the electrodes of two of which are located on diagonal vertices of a rectangle with angular shift. with respect to the electrodes of the two other spark gaps, and the control unit in the form of two commuting conducting bodies located on the associated with the drive ielektricheskom disk so that during rotation intersect in turn spark gaps arranged in a diagonal ver-.

06

rectangular tires, electrodes on one side of the body located along diagonal vertices of the rectangle are pairwise combined and connected to output pins, and two diagonally placed M vertices of the opposite side electrode rectangle are connected to input terminals for connecting the first power source, - characterized by the fact that, in order to extend the functionality due to the separate formation of forward and reverse currents, the free electrodes of the opposite the main side of the housing is connected to the additional input pins to be connected

second power source.

(pic 2

Claims (1)

Claim A device for converting direct current to alternating current, comprising a housing, on both sides of which are mounted electrodes vertically geometrically placed in a rectangle and forming four spark gaps in pairs, the electrodes of two of which are located on the diagonal vertices of the rectangle with the possibility of angular shift relative to the electrodes of two other spark gaps , and a control unit in the form of two switching conductive bodies located on a dielectric disk connected to the drive e in such a way that during rotation intersect alternately spark gaps located in the diagonal vertices. busbars of the rectangle, while the electrodes located on the diagonal vertices of the rectangle on one of the $ sides of the case are paired and connected to the output terminals, and two placed on the diagonal vertices of the rectangle of the electrode on the opposite side of the casing of the yen with input terminals for connecting the first power source, which that, in order to expand the functionality due to the separate formation of pulses of forward and reverse currents, the free electrodes of the aforementioned the th side of the housing are connected to the introduced additional input terminals for connecting 20 of the second power source.