Power supply unit and welding equipment

Details Power supply unit and welding equipment Power supply unit and welding equipment

B - Operations, Transporting

23

K

B23K 1/08 (2006.01) B23K 9/10 (2006.01) B23K 11/24 (2006.01) G05F 1/08 (2006.01) H02K 47/22 (2006.01) H03B 19/14 (2006.01)

Patent

CA 2044065

- 114 - Power Supply Unit and Welding Equipment ABSTRACT OF THE DISCLOSURE A power supply unit comprises three input terminals connected to a three-phase A.C. power supply, a phase control circuit controlling the firing of the three-phase A.C. for each phase, and a transformer comprising a single- phase iron core which is winded by first to third primary coils at the primary side and by a single-phase secondary coil at a secondary side and in which the first to third primary coils are connected to the three-phase A.C. power supply, and it outputs a single-phase A.C. having the frequency three times as that of the input current. Therefore the problem of unbalance between three phases is solved and a small-sized and lightweight power supply unit can be obtained. In addition, use of the power supply unit in a welding equipment allows to miniaturize the high efficiency welding equipment.

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