The mid-frequency welding transformer is made by combining ferrite high-permeability silicon steel sheets and then casting with epoxy resin, significantly reducing the transformer's losses. Current measurement is conducted in the secondary circuit using sensors. The primary assembly of the transformer features a temperature-sensing switch, while the secondary assembly includes a rectifier set. All coils and rectifying elements are equipped with water-cooled heat dissipation. This greatly reduces the weight of the core material.
The medium-frequency inverter is a critical power drive component of the equipment. It converts three-phase 50/60Hz 380V AC input into a high-voltage DC power supply, which is connected to capacitors for filtering. Subsequently, the inverter outputs an appropriate 1KHz square wave based on the control input settings and feedback current. This is then used to power the low-voltage welding process through a medium-frequency welding transformer. The inverter box is equipped with an exhaust fan for air-cooling the inverter, ensuring safe operation.
Compared to traditional welding power sources, the following advantages are presented:
The system has enhanced adaptability to fluctuations and voltage drops in the power grid. A portion is stored and supplied to the load by the inverter, replacing the direct supply from the grid. It saves energy, improves power factor, and reduces processing costs. It can reduce interference in large secondary circuit areas. The welding current is DC, and it will not affect welding when there is induced (magnetic) material in the secondary winding. It parses parameters more accurately, quickly, and precisely. It can prevent damage caused by the wave interference in the power grid induced by the thyristor system.
