How to change the charger of electric welding machine

Connect the output of the welding machine to the bridge rectifier, and it becomes a charger.

Two half-bridges can be used to form a bridge rectifier circuit, and one half-bridge can also be used to form a full-wave rectifier circuit with a center tap.

The high-temperature arc generated by the short circuit of anode and cathode is used to melt the solder and the material to be welded on the electrode, so as to achieve the purpose of combining the two.

Extended data:

In order to ensure frequent short circuit (contact between electrode and weldment) during welding, the voltage should be automatically reduced to zero to limit the infinite increase of short circuit current and burn the power supply.

The current signal is taken from the shunt at the DC output end of the rectifier as the current negative feedback signal. With the increase of DC output current, negative feedback also increases, thyristor conduction angle decreases, output current and voltage decrease, thus obtaining reduced external characteristics.

When the output voltage of the thrust circuit is lower than 15V, the output current increases, especially in the case of short circuit, which forms the external characteristics of external resistance and makes the electrode not easy to stick.

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