Welding transformer and welding transformer assembly and welding apparatus

Abstract

It is possible to control a welding in a high speed and a high precision large electric current, and consumption electric power is also reduced. In the welding transformer, a loop magnetic core, a wound primary coil, plural positive side coilsand plural negative side coilsthat are alternately sandwiched between respective gapsof the primary coil, are comprised. A coil is fixed on the other surface of a contact base member. On the other surface of the contact base member, a first connection polar boardis electrically connected to a positive side electric conductorthrough the first connection polar board. A negative side coilis electrically connected to a negative side electric conductor. The connecting part of the positive side coiland the negative side coilis electrically connected to the third connection polar board. By sandwiching a thin insulation layer, a positive side electric conductor, a rectifying deviceand a first polar boardare arranged on one side; A negative side electric conductor, a rectifying deviceand a second polar boardare arranged on the other side; and the first polar boardand the second polar boardare electrically connected to a third polar board. It is possible to use by combining plural units and by connecting an output side in parallel in a small size and a large capacity.