Arc welding machine circuit using 25kHz thyristor inverter

Arc welding machine circuit using 25kHz thyristor inverter

For an arc welding machine using 25kHz high frequency and thyristor inverter , the transformer can be smaller. The circuit is shown in Figure 9-14.
The no-load output voltage of the machine is 45V DC, 90V (peak), and the short-circuit current is 125A DC.
    The circuit consists of five parts: power supply part (composed of diodes VD16~VD2, filter capacitor C7, etc.), inverter
part (composed of diodes VDi~VD4, thyristor Vl-V4, resistor Ri-R4, capacitor CL and inductor Li, etc. Composed), trigger
circuit (composed of pulse transformers TMi, TMz and related resistor-capacitive components, diodes, voltage regulator tubes, etc.), output
part (composed of transformer T and diodes VD22~VD25, etc.) and arc suppression circuit (composed of It is composed of bidirectional thyristor V5, thyristor
V5, voltage regulator VS3, diode VD?,6, capacitor C8, resistor R14~Rl7, etc.).