SU1690986A1 - Welding machine - Google Patents

Abstract

The invention relates to welding machines and can be used for welding ferrous metals and for feeding other consumers, for example, for starting internal combustion engines. The purpose of the invention is to improve the energy performance. The welding machine consists of a two-section transformer on toroidal magnetic conductors installed with the possibility of contact. Each transformer section contains primary windings and a common secondary winding located in the contact zone of the magnetowires. The control circuit contains a rectifier, a switch, a control winding, three resistors and two capacitors. The output voltage of the apparatus varies due to the phase control of the rectifier. This makes it possible to carry out smooth current control in a wide range with low energy losses, which provides improved energy characteristics. 2 yl

Description

The invention relates to welding machines and can be used as a current source for welding metals, for starting internal combustion engines in winter, charging batteries, and the like.

The aim of the invention is to improve the energy characteristics of the welding machine.

FIG. 1 shows the electrical circuit of the welding machine; in fig. 2 - time diagram of the device operation, (a) - at the maximum values of the output voltage, (6) - at the minimum values of the output voltage, (c) - current-voltage characteristic of the device.

The welding machine consists of a two-section transformer on toroidal magnetic cores 1 installed with a contact possibility, each section of which contains primary windings 2, 3 and a common secondary winding 4 placed in the contact zone 5 of the magnetic circuit 1, control winding 6, rectifier 7 and control elements 8 , 9, 10, 11, 12. In this case, the leads of the secondary winding 4 are connected to the input diagonal of the rectifier 7, the outputs of which are / o connected to the output terminals 13, 14. In the output terminal 13 a key 15 is placed, one output of which is connected to the cathodesthe emitters 16, 17 of the optocouplers, and the second with the first terminals of the capacitors 8. 9 and the resistor 10. The anode of the radiator 16 is connected via a resistor 12 to the third output of the control winding 6. The anode of the radiator 17 is connected via a resistor 11 to the second output of the control winding 6. Second terminals the capacitors 8, 9 are connected to the first and fourth terminals of the control winding 6, and

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resistor 10 - with the fifth output of the same winding. The terminals of the sections 2, 3 of the primary winding, connected in series, are connected to the input terminals 18, 19.

The welding machine operates as follows.

When an alternating single-phase supply voltage is applied to the sections 2, 3 of the primary winding, an alternating electromagnetic flux is formed in the magnetic conductors 1, which, propagating along the shortest path, induces EMF in the secondary winding 4 and the control winding 6, the resulting voltage from the secondary winding 4 is fed to the input diagonal of the rectifier 7. The voltage taken from the terminals of the control winding 6 is supplied to the anodes of the emitters 16, 17 through resistors 11, 12, and the voltage taken from the terminals of the capacitors 8, variable resistor 10 and The transmitter 9, - to the cathodes of the emitters 16, 17 through the switch 15, installed in the housing of the output terminal 13. The output voltage of the apparatus varies due to a phase shift of the voltage on the radiators 16, 17 of the electrons relative to the voltage of their optothyristors. The output voltage of the apparatus is adjustable from 8 to 50 V (ohm. Figs. 2a, 6). When the load current varies from 50 to 200 A (by 400%), the output voltage (see Fig. 2, c) varies within 38 ,,. 35 V (by 13%).

Compared with the prototype, this unit has an increased efficiency and lower specific consumption of materials.

Claims (1)

Claims. A welding machine containing a two-section transformer on toroidal magnetic conductors installed with the possibility of contact, each section of which contains a primary winding and a common secondary located in the contact zone, as well as a control winding located on one of the magnetic cores, the terminals of the primary windings are connected to the corresponding input terminals, the secondary terminals are connected to the inputs of the rectifier whose outputs are connected with output terminals, the first terminal of the control winding is connected via the first capacitor to the output of the first variable resistor, characterized in that, in order to improve the energy The capacitors, the second capacitor, the second and the third variable resistors and the key are inserted in it, and the rectifier is made according to a bridge circuit, with its first two arms containing diodes, and the second - optronic couples, with the common junction of the anode and cathode of the diodes and the anode and cathode of the receivers of the optocoupler pairs are connected to the rectifier input, the anode and cathode of the receivers of the optocoupler pairs are connected to the anode and cathode of the respective diodes and connected to the outputs of the rectifier, s connected in series the second variable resistor and the emitter of the first photo coupler and a third variable resistor and the emitter of the second optocoupler connected to the first terminal of the switch, the second terminal of which is connected to the output of the first capacitor, the first variable resistor and the output of the second capacitor, the second output of which is connected to the fourth output of the control winding, the fifth output of which is connected to another the output of the first variable resistor. J18 Network 2208, SO Hz  I 1 g li H