Control features of multicell-type current regulator for resistance welding

The features of resistance welding process are considered. A multiceli buck converter as a simplest, efficient and stable topology for resistance welding power supply is proposed. The efficiency of a buck converter cell is analyzed. The particularities of welding pulse generation are described. Relay control as an appropriate method for minimizing the welding pulse curve error is analyzed. The restrictions of relay method use for multiceli converter topology are shown. A modified strategy to reduce the error of welding pulse generation by multiceli converter is proposed. The theoretical aspects of the converter design are verified with MATLAB Simulink.