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 includes a temperature-sensing switch, while the secondary assembly has 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 source, 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 to ensure safe operation.
Compared to traditional welding power sources, the following advantages are present:
The grid's fluctuations and voltage drops are more adaptable; a portion is stored and supplied to the load by the inverter, replacing the direct supply from the grid. Energy-saving, power factor improvement, and cost reduction in processing. It can reduce interference in a secondary circuit with a very large opening area. The welding current is DC, and it won't affect welding when there's induced (magnetic) material in the secondary winding. More precise, rapid, and accurate parameter interpretation. Capable of preventing damage caused by the wave interference on the grid induced by the thyristor system.
