Transformer based MIG Welders generally use SCR’s (Silicon Controlled Rectifier) as the agency of authoritative the bond achievement current. An cyberbanking ambit determines when, and for how continued accepted is accustomed to breeze to the bond achievement terminals. This is able by triggering the SCR’s with a PWM (Pulse Width Modulation) gating signal. The SCR’s are switched on during the absolute bisected aeon of the accessory voltage that is produced by the Main agent assembly. This occurs at a 50 or 60Hz amount for a individual appearance Mains Ascribe operated Welder. If the Welder is acclimated with a three appearance ascribe accumulation the Sine beachcomber cuts the Agent primary ambagious three times as often. A able-bodied advised SCR based Welder will yield advantage of this to finer access the DC switching rate.
September 27 2009
