An integrated generator, compressor and welding power supply sized to fit within a pickup bed. As a result, a semiconductor substrate in which a defect in an interface between the single crystal semiconductor layer and the insulating layer is reduced can be provided. The control device switches on one of the switched current sources when the high-side power switch and the low-side power switch are open, while the other switched current source is switched off. The source of the MOSFET device provides an output port for charging a capacitor in a conduction or on state. The exchange of data andor the transmission of energy between these arrangements ensues in contactless fashion, and the transmission of the data andor of the energy ensues continuously.