CS211796B1 - Interference Suppression Connection for Reducing Industrial Interference - Google Patents

Abstract

The invention relates to high-current electrical engineering. The purpose of the invention is to reduce industrial interference arising mainly from the operation of power semiconductor devices. The essence of the invention consists in connecting a block (21) for suppressing the symmetrical component or a block (22) for suppressing the asymmetrical component either separately or in series between parts (A, and A2) of a divided winding of a current compressor choke on one core. The arrangement is particularly suitable for suppressing interference from thyristor sources for welding. Fig. 2 best characterizes the invention.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference suppression circuit for reducing industrial interference, particularly due to the operation of power semiconductor devices, a current-compensated choke connected between a power supply and an interference electrical device,

Operation of power semiconductor devices generates disturbing voltages penetrating the power supply networks, interfering with radio, television and adversely affecting the operation and operation of other nearby electrical devices. All electrical equipment must therefore be suppressed to the specified limits.

The hitherto known interference suppression circuits use different types of interference suppressors. Compensated toroidal core reactors made of permalloye with high initial permeability are one of the most important suppression components, especially for semiconductor devices. Compensated chokes, complemented by a combination of symmetric and asymmetric interference suppression blocks, are indispensable screen filters to reduce industrial interference.

A disadvantage of these hitherto known circuits is the difficulty of adapting the filter to the closing impedances and using a plurality of blocks to suppress the symmetrical and asymmetric interference component, thereby substantially increasing the material cost of the suppression and the weight of the filter.

The above-mentioned disadvantages eliminate or at least substantially reduce the circuit according to the invention, which consists in that the block for suppressing the symmetrical interference component or the block for suppressing the asymmetrical interference component are connected either separately or in series between the split winding parts of the current compensated choke wound on one core.

An exemplary circuit according to the invention is further described with reference to the drawings in which: FIG.

3 shows the actual embodiment of the three variants for the two- and three-wire connection and in FIG. 4 the third variant for the four-wire connection.

It is an object of the invention to distribute a current-compensated choke winding wound on one core, e.g. permalloye to two parts labeled A1 and A2, which need not be the same.

In a first variant, FIG. 1a shows the circuitry of the block 21 for suppressing the symmetrical interference component between the parts A1 and A2 of the split winding wound on one toroidal core of the current compensated choke connected between the power supply and the interference electrical device.

In Fig. 1b, in a second variant, the block 22 for suppressing the asymmetric interference component is shown in the same way, and in the third variant, in Fig. 1c a series connection of the blocks 21 and 22 for suppressing the symmetrical and asymmetric interference components is shown.

and

Fig. 2 shows the actual embodiment of the above three variants for the two-wire connection, Fig. 2a shows the block 21 for suppressing the symmetrical interference component, Fig. 2b shows the block 22 for suppressing the asymmetric interference component, and Fig. 2c 21 and 22 for suppressing both symmetrical and asymmetric components between the two parts A1 and A2 of the split winding wound on one toroidal core of the current compensated choke.

Fig. 3 shows the variants of the connection according to the invention for a three-conductor lead and Fig. 4 shows the third variant for a four-conductor lead. Derivation from the examples of the two-conductor leads in Fig. 2 is straightforward and does not require further explanation.

The circuitry according to the invention increases the insertion loss of the current-compensated choke, permits better adaptation of the filter to the closing impedances by increasing the choke winding thus distributed in the power filter, and increases the filter suppression efficiency. The arrangement according to the invention can be integrated into all the leads to the interference suppression device, since, in terms of interference, all the conductors are equivalent.

Claims (1)

SUBJECT OF THE INVENTION Wiring of a suppression silencer for reducing industrial rose, mainly due to the operation of power semiconductor devices, by means of a current-compensated choke and a block for suppressing a symmetrical or asymmetric interference component connected to the choke either individually or in series. The interference or block (22) for suppressing the asymmetric interference component are connected either separately or in series between the parts (A1 and A2) of the split winding of the current compensated choke not wound on one core.