SU1409425A2 - Multioperator power supply system for d.c. welding - Google Patents

Description

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The invention relates to welding production, namely to devices providing direct current multiline welding systems containing posts with different polarity of current on the electrode, and are used in all areas of the national economy where there is a large amount of welding. Ih works.

The aim of the invention is to increase the reliability of the system by reducing inrush currents.

The drawing shows a block diagram of a multi-stage power supply system for high-current welding.

The power system contains a source of 1 DC power supply, distribution 2–4 distribution lines with welding groups 10STOV 5 and 6, a feedback block 7, consisting of two transistors 8 and 9, two: 10 two keys 12 and 13 with two armature switch-on currents in the power source and through the control unit.

After switching on the power source 1 to the network through the control unit 17, busbars 2-4 and welding stations 5 and 6 appear to be energized, in feedback block 7 threshold devices 14 and 15 are triggered, keys 12 and 13 are opened with a short shutter speed and the output signal supplied to 10 control unit 16 is varied with the aid of transistors 8 and 9, depending on the magnitude of the voltage at the inputs of the zener diodes 10 and 11 of the feedback unit.

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If there is no voltage on the direct- or reverse-polarity cable, the corresponding transistor closes, the threshold device is activated, and the key is closed, the transistor shunts, and the stabilization circuit continues

new devices 14 and 15, the control unit 16 controls only 20 from the signal from the single shadow line and the control unit 17 of the polarity.

A multipoint power system works — Availability of keys with threshold devices as follows. In the feedback unit, it allows

With the power supply disconnected, industry technological capabilities

: Networks on busbars 2-4, welding systems with multi-station power supply system, to ensure

ah 5 and 6 and at the inputs of block 7 voltage stabilization during welding only eat communication is no voltage. Direct or reverse polarity and increase the reliability of the system, reducing the shock currents when the power source is turned on to the network.

Tests have shown reliable operation of the multipoint power system. The system provides voltage stabilization at the output of the power source not only when welding simultaneously with direct and reverse voltage at threshold devices 14 and 15 (threshold devices can be relay coils) keys 12 and 13 (relay contacts) are closed and shunt granzistors 8 and 9 .

At the moment of connecting the power source 1 to the network, the control unit 17 on the command from the feedback unit 7 via the control unit Slok 16 lowers the voltage at the input of the power source, which reduces

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NON polarity, but also when welding only on one polarity.

switching current currents in the power source and through the control unit.

After switching on the power source 1 to the network through the control unit 17, busbars 2-4 and welding stations 5 and 6 appear to be energized, in feedback block 7 threshold devices 14 and 15 are triggered, keys 12 and 13 are opened with a short shutter speed and the output signal to control unit 16 is varied with the help of transistors 8 and 9, depending on the magnitude of the voltage at the inputs of the zener diodes 10 and 11 of the feedback unit.

NON polarity, but also when welding only on one polarity.

Claims (1)

MULTI-POST SUPPLY SYSTEM FOR DC WELDING St. No. 1156874, characterized in that, in order to increase the reliability of the system by reducing inrush currents, two keys and two threshold devices are introduced into the feedback unit, while the first outputs of the first and second keys and the first and second threshold devices are interconnected and connected to a common busbar, the second output of the first key is connected to the first output of the feedback unit, the second output of which is connected to the second output of the second key, the second output of the first threshold device is connected to the direct polar busbar spine and reverse polarity power track is connected to a second terminal of the second threshold device. /5 SU „„ 1409425