- 16 -
Working Principle
1. Three Ways to Connect the Polarity Reversal Cable
1.1. General Connection
（
Welding Mode: Pulse/double pulse)
1.2.
Flux-cored Welding
（
Welding Mode: MIG/MAG
）：
1.3.
MMA Welding
（
Welding Mode: MMA
）：
2. Diagram Explaining Working Principle
2.1. A bridge rectifier converts AC to DC;
2.2.
Controlled by PWM, the IGBT inverts the DC to 33Khz AC and transmits it
through a high-frequency transformer;
2.3.
After secondary rectification and reactor filtering, the output current is sufficient to
