Patent ID: 9349790
Filing Date: 2016-05-24
CPC Classification: H01L,H03K

Claim Text:
1. A high voltage device immersed in a liquid dielectric, the device comprising: a pair of pole pieces, each pole piece including a profiled surface at a peripheral edge region, the profiled surface of the pole pieces facing each other; a device body located between the pole pieces, the device body being subjected to an electric field and comprising: passivation material comprising: (i) a first material part surrounding and in contact with the edge termination region of the device body and configured to envelope the planar edge termination components, and diffuse the electric field as it emerges from the edge termination region, and (ii) a second material part disposed outside the first material part, and configured to fill the space between the profiled surface of each pole piece and the external surface of the first material part, to provide an interface with the profiled surface of each pole piece and which further diffuses the electric field as it emerges from the first material part of the passivation means, a radially outer surface of the second part of the passivation material being in contact with the dielectric liquid; wherein the profiled surfaces and the planar edge termination components of the multi-electrode array control the diffusion of the electric field within the passivation material.