| 摘要 |
A TIG welder and methodologies are disclosed for providing an output welding current in a welding circuit, wherein the welder comprises main and background power supplies, wherein the main supply comprises an SCR network operable to selectively connect a transformer secondary winding to the welding circuit according to SCR control signals. The background supply is connected to the SCR network, which operates to selectively connect the second power supply to the welding circuit according to the SCR control signals. The SCR network may comprise first and second SCRs operating according to first and second SCR control signals from a control circuit, where the control circuit is connected to the SCR network and the second power supply and operates to selectively connect the SCR control signals to the SCR network according to the setpoint current value.
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