Inverter power source null for electric arc welding

摘要

PURPOSE: To reduce a transient condition imposed on a switching element by winding two output coils around a core to the same direction and in the same times, and mounting the two output coils with a connection coefficient larger than a specific value. CONSTITUTION: An invertor I is constituted of an output circuit C including a transformer T having a core D. A direct current power is added from a bridge rectifier and a filter network 10 to between-terminals 12 and 14 and terminals 12a and 14a, and a direct current pulse is applied from switch sets 20 and 22 and 24 and 26 through input coils 30 and 32 as shown by arrows A and B. The coils 30 and 32 are respectively constituted of serial connection coil parts P1 and P2, and P3 and P4, and output coils 42 and 52 are respectively constituted of serial connection coil parts S1, and S3 and S4. There input and output coils are mutually connected closely. Also, these coil parts have an interconnection coefficient larger than 0.980.