ARC WELDING MACHINE OR PLASMA CUTTER

摘要

PROBLEM TO BE SOLVED: To provide a driving circuit by which a reverse bias can be applied with a simple constitution to a power semiconductor by a pulse transformer with no intermediate terminal in a secondary winding. SOLUTION: This is a power semiconductor driving circuit equipped with the pulse transformer with no intermediate terminal in the secondary winding, a capacitor for the reverse bias and a Zener diode connected to the capacitor in parallel.