PURPOSE: To miniaturize a power unit and to reduce the weight thereof by providing a converter capable of two input voltages which can be used both 200V and 100V of the AC power source, and is not inconvenienced by an engine driven generator as the power source.
CONSTITUTION: A power source of arc welding equipment is provided with an input rectifier 3 to rectify the AC power source 1 of an engine driven generator, smoothing capacitors 11, 12 of the rectified output, an inverter 14 in parallel with the capacitors 11, 12, and a driver circuit 24 to control the inverter 14. In addition, a switching circuit 9 to apply the approximately constant DC voltage to the inverter 14 irrespective of the AC power source 1 is the high voltage system or the low voltage system, and an input discriminating circuit 22 to discriminate the input voltage from the AC power source 1 are provided. This input discriminating circuit 22 consists of an input voltage detecting circuit and a dead zone setting part to stop the action of the inverter 14 during the period of time between when the detected signal of the input voltage detecting circuit exceeds the upper limit of applying the power source of the low voltage system and when the detected signal reaches the lower limit of applying the power source of the high voltage system.
| WO/2022/023526 | METHOD AND DEVICE FOR WELDING WORKPIECES |
| JPS6178565 | DC ARC WELDING POWER SOURCE DEVICE |
| JP3811532 | POWER UNIT FOR ARC WORKING |
OKAMOTO SHIGERU
DANJO KENZO
MORIGUCHI HARUO
KINOSHITA ATSUSHI
