| 摘要 |
PURPOSE:To permit equil. regulation of electric current waveforms, by using switching elements which control on and off of a main switching element for high frequency conversion and which are faster in switching speed than the main switching element and providing a delay circuit of variable type to the switching control system of the switching elements. CONSTITUTION:An electric power source circuit for welding is constituted of a rectifier 7, a frequency converting circuit 9 consisting of plural sets of switching elements, switching element driving circuits 21, 22 which control on and off of the switching elements, a voltage transformer 10 for welding to be inputted with the AC power source obtained with the circuit 9 and rectifiers 11, 12 which convert the output thereof to DC and applies the same to welding load. >=1 Set of the switching driving circuits for the circuit 9 which are faster in switching speed than others are used and further a reactor 13 is provided. Thus the equil. regulation of the output current waveform from the circuit 9 is made possible. |
