WELDING ARC POWER SUPPLY Russian patent published in 2009 - IPC H05B7/144 

FIELD: electrical engineering.

SUBSTANCE: inverter transformer has one primary and two secondaries connected in either series or parallel, each being connected to its appropriate rectifier. Outputs of both rectifiers are connected in parallel with welding electrodes. Note here that one of secondaries is rated at maximum current of electrical load and low voltage of sustaining arcing, while the other one, alone or with the first one that provides arc firing voltage, features minimum power. NC-contacts of direct-action thermal relay are connected to its circuit in series with adjusting resistor with partial or complete shunting of blow motor winding.

EFFECT: lower costs, rated power, weight and overall dimensions; higher efficiency, welding quality and reliability.

2 dwg