High voltage resistant signal transmission device with isolating transformer

Abstract

Abstract The isolating transformer has two windings galvanically separated from each other and each connected to a respective point, which points are set at various high voltage potentials. At least one additional transformer is provided in series with the isolating transformer, and has two galvanically separated windings, with one winding being galvanically separated from the isolating transformer and the second winding being galvanically connected to a first winding of the isolating transformer. The second winding of the additional transformer is connected to one of the points and is split relative thereto in a manner such that a parasitic current produced between the two windings of the isolating transformer, and which is split with component currents flowing to both terminals of the first winding of the isolating transformer and therefrom to and into the split second winding of the additional transformer, produces, in the additional transformer, partial current flows which are mutually compensating to at least a great extent in their effect on the one winding of the additional transformer. Preferably two additional transformers are provided in series with the isolating transformer, each being operatively associated with a respective winding of the isolating transformer. One winding on one additional transformer is connected to the input and to ground, and one winding on the other additional transformer is connected to the output of the device. Each additional transformer may be a compensated transformer with one toroidal core, a compensated transformer with two toroidal cores, or a double compensated transformer with two toroidal cores.

Inventors

• 👤 Jurgen Zeis

Bibliographic Details