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This paper deals with the control improvement of a middle-frequency resistance spot welding system. This is achieved by a combined closed-loop control of the welding current and closed-loop control of the iron core saturation level. The proposed control assures a very short rise time of the welding current and the best possible utilization of the transformer iron core.
This paper deals with a middle frequency resistance spot welding system. It consists of a semiconductor input converter, a single phase welding transformer with one primary coil and two secondary coils, and a full-wave output rectifier connected to the transformer's secondary coils. The unwanted current spikes often appear in the transformer's primary coil current during steady state operation, which...
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