Device for operation of a resistance welding machine, or of another pulsed-power load

摘要

In the case of a device for operating a resistance welding machine or another pulsed-power load of high power, which loads are supplied via a controllable invertor as control element, it is intended to reduce the reactive volt ampere consumption severely and to reduce the real power consumption comparatively. This is achieved in that a mains-supply converter, having an intermediate circuit with a pulse invertor (5) having two or more phases, is provided as control element, in the case of which an intermediate-circuit battery (3) (which supplies said invertor and is rechargeable) is arranged in parallel with said invertor in the intermediate circuit, in that the battery is charged at a constant charging current which essentially corresponds to the mean value of the load current, and in that the invertor is self-commutated and is pulsed at high frequency (approximately 500 Hz) from the battery. <IMAGE>