| 摘要 |
PURPOSE:To make the short-circuit detection correct by using the output set value of welding power source as the reference signal for detecting short-circuit and by discriminating the short-circuit period and arc generated period based on the comparison between this set value and welding voltage. CONSTITUTION:The coefficient multiplier 13 to adjust the level between the output signal of a welding voltage detector 8 and the output signal of output setter 11 is set up. The short-circuit detection circuit is composed of the welding voltage detector 8, output voltage setter 11, coefficient multiplier 13 and comparator 10. The signal (er) which the output (ea) of the detector 8 and the output of the output setter 11 are adjusted on the level by the coefficient multiplier 13 is inputted into the comparator 0. The signal corresponding to the size relation of both signals is then outputted from the comparator 10 to a controlling circuit 12. Therefore when the welding conditions are changed, the reference signal for short-circuit detection varies as well and a correct short-circuit detection enabled.
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