No-load voltage limiter for welding transformer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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No-load voltage limiter for welding transformer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / welding equipment

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It is possible to limit the open circuit voltage of the welding transformer when the welding arc circuit is broken using the proposed limiter, which has a high speed (see figure).

Open-circuit voltage limiter for welding transformer

The limiter is controlled from the sensor L, which is a coil wound on ferrite rods and placed near the secondary winding of the welding transformer T1. In the circuit of the primary winding T1, thyristors VS1 and VS2 are connected in opposite directions, and in parallel with them, the chain R1 and C1, which, when the circuit is broken, the object being welded - the electrode limits the voltage on electrode 1 to a voltage of less than 12 V.

When the electrode 1 is closed to the object 2 to be welded, a voltage is induced in the sensor L, which opens the transistor VT1. Optocoupler thyristor VS3 and thyristors VS1 and VS2 are switched on. The full mains voltage is applied to the transformer, the arc is ignited, and welding is in progress. After the end of welding or arc break, there is no voltage on the sensor, the transistor VT1 closes, turning off VS3, and therefore VS1 and VS2. The voltage on the welding electrode is less than 12 V.

Details. Thyristors VS1 and VS2 type TL-160-6 are installed on the coolers. Resistor R1 of the PEV-100 type, capacitor C1 2 uFx600 V of the MBG4-1 type, diode bridges VD1 and VD3 of the KTs402A (B) type can be replaced with KD209A diodes, the rest are MLT type resistors. Sensor L is wound on a ferrite rod with a diameter of 8 mm and a length of 100 mm, has 250 turns of PEL-0,2 mm wire. The limiter practically does not need to be adjusted. You should measure the voltage at the zener diode VD2. It should be 12-13 V, if less, then you need to choose the resistance of the resistor R2.

Author: V. F. Yakovlev

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