Regulated power source for manual electric arc welding

FIELD: electric welding processes and equipment, namely regulated power source for manual electric arc welding, possibly in workshops, in domestic or industrial condition.

SUBSTANCE: inlet of bridge type diode rectifier is connected with one section of secondary winding of transformer. Two gangs of capacitors are connected in parallel with diodes of one arm of bridge type rectifier and with one outlet of said section. Smoothing choke with split windings is connected between arms of bridge type rectifier. Secondary winding of transformer includes additional booster section to which two thyristors are connected. Said thyristors are controlled by means of pulse-phase control system. The last includes double-threshold comparator whose inlet is connected with outlet of power source and whose outlet is connected with inlet for interlocking pulses of pulse-phase control system.

EFFECT: possibility for proving smooth regulation of welding electric current in desired range.

2 dwg

 

The invention relates to the field of welding and is designed for manual arc welding in shops, at work and in everyday life.

RF patent №2162777 protects the power source for manual arc welding, contains a bridge rectifier diodes, fed from the secondary winding of the transformer, and two batteries of capacitors connected in parallel to the diodes of one shoulder of the bridge rectifier, and between the shoulders of the bridge rectifier has a smoothing reactor with a split winding.

The specified power supply has the disadvantage that it is only possible manual adjustment of welding current by switching the number of turns of the secondary winding. This is not always an opportunity to choose the best welding mode, depending on the specific conditions of the welding process (brand and the diameter of the electrode, the thickness of the welded products, the mains voltage and the like).

The aim of the present invention to provide a continuous adjustment of welding current to the extent necessary.

This goal is achieved by the fact that in the proposed power supply, consisting of a bridge rectifier diodes, the input of which is connected to the secondary winding of the transformer, two batteries of capacitors connected in parallel to the diodes of one shoulder of the bridge rectifier and the inductor with useplanning windings, the secondary winding of the transformer includes an additional booster section, connected to two thyristor-driven system of pulse-phase control (RF).

Figure 1 shows a schematic diagram of the power supply. The schema contains step-down transformer T with two secondary sections 1 and 2, a diode bridge diodes VD1-VD4, the capacitors C1, C2, smoothing inductor windings L1 and L2 on a common magnetic core, the thyristors VS1, VS2 and SETH that controls the angle of their release.

A diode bridge connected to the section 1 of the transformer, which has a voltage sufficient for ignition of the welding arc and create a minimum welding current. Thyristors VS1 and VS2 are connected to the booster section 2 of the transformer and create additional rectified voltage corresponding to the maximum current welding when fully open VS1 and VS2. Changing the opening angle of the thyristors with SETH, it is possible to smoothly regulate the welding current in the required range. As SIFU can be used by virtually any of the known schemes, such as simple - to unijunction transistor [alesevich AU AND other Dvukhmodovye diodes in automation): "Energy", 1972 - p.23].

If SETH will produce pulses for firing the thyristors regardless of the mode of operation of the power source of the welding arc, the POS is but the appearance of two unwanted modes. If before welding is set at the minimum angle control of thyristors and VS1 and VS2 are fully open, the output of the source will be a large voltage value of idling, which may exceed the value regulated by GOST 13821-77 on one-post rectifiers for electric arc welding (100). If to start welding to produce the touch electrode welded products, due to the large output voltage will arise such a short circuit current that the electrode can be welded to the products and to melt, and welding would be impossible.

So SETH must have a device that removes trigger pulses to the thyristors in the idling and short circuit and allow them to flow only in the combustion mode of the welding arc. This corresponds to the voltage specified by the expression 20+0,04IStvolts, where ISt- current arc welding [Sachs M.I. Welding rectifiers - L.: Energoatomizdat, 1983 - 94 C.]. Depending on the welding mode this voltage may lie in the range of about 22÷35 volts and only when such voltages at the output of the power source shall be permitted to supply trigger pulses to the thyristors VS1 and VS2.

To ensure this condition scheme SIFU must be supplemented by two-threshold comparator, in which the lower threshold corresponds to the output of the th supply voltage less U n=15÷20 (at short circuit), and the upper output voltage > Uin=35÷40 In (at idle). When the output voltage source Uo<Unand Uo>Uinthe comparator disables the generation of control pulses. An example is the scheme described in [Rozanov J.K. fundamentals of power converters. M.: "Energy", 1979 - 335 S.].

Functional diagram of the control device of a power source of the welding arc is shown in figure 2. Output voltage source Uoexcites arc and is input to two Comparators. The output of the comparator is connected to the input of the lock SIFU. The welding current is regulated by the regulator RT. In the idling and short-circuit protection comparator disables the generation of the control pulses of the thyristors, and they are locked. Output voltage source generates only a diode bridge and is safe for both the welder and the normal ignition of the arc.

After ignition of the arc and the electrode from welded products, the output voltage of the source is included in the range of burning of the arc, and the comparator permits the filing of control pulses to the thyristors. They open and create a voltage corresponding to the set value of welding current.

Adjustable source of the power supply for manual arc welding, contains a bridge rectifier diodes, the input of which is connected to one section of the secondary winding of the transformer, two batteries of capacitors connected in parallel to the diodes of one shoulder of the bridge rectifier and to one conclusion of this section, and between the shoulders of the bridge rectifier has a smoothing reactor with a split winding, wherein the secondary winding of the transformer includes an additional booster section, connected to two thyristor-driven system of pulse-phase control containing two-threshold comparator, whose input is connected to the output of the power source and the output to the input of the lock pulse system pulse-phase control.



 

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