Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
178 words
In a rectifier apparatus constituted by rectifier elements of the semiconductor type, wherein a number of said rectifier elements are connected in series to form a rectifier unit, and wherein a number of said rectifier units are arranged in stages one above the other to form a rectifier stack, each said stage comprising at least two of said rectifier units and all of said rectifier units being connected in series, the improvement wherein to compensate for parasitic capacitances each of said stages is substantially surrounded at its outer periphery by a screening device composed of at least one metallic screen being electrically connected to a junction between two of said rectifier units included in the corresponding stage, and a pair of mutually electrically insulated screening plates located at The outside of and opposite to said screening devices and extending along said rectifier stack, said screening plates carrying respectively the cathode and anode potentials of the entire rectifier stack, and the distance between said metallic screens and said screening plates increasing with the increase in potential along the stack.
Claim 2
Dependent Claim
178 words
In a rectifier apparatus constituted by rectifier elements of the semiconductor type, wherein a number of said rectifier elements are connected in series to form a rectifier unit, and wherein a number of said rectifier units are arranged in stages one above the other to form a rectifier stack, each said stage comprising at least two of said rectifier units and all of said rectifier units being connected in series, the improvement wherein to compensate for parasitic capacitances each of said stages is substantially surrounded at its outer periphery by a screening device composed of at least one metallic screen being electrically connected to a junction between two of said rectifier units included in the corresponding stage, and a pair of mutually electrically insulated screening plates located at The outside of and opposite to said screening devices and extending along said rectifier stack, said screening plates carrying respectively the cathode and anode potentials of the entire rectifier stack, and the distance between said metallic screens and said screening plates increasing with the increase in potential along the stack.
Claim 3
Dependent Claim
103 words
Rectifier apparatus as defined in claim 1 wherein all of said rectifier units are arranged to form a helical-like structure with said stages forming the turns of said helical structure, and one of said metallic screens each being electrically connected to the junction between two subsequent rectifier units included in one of said stages, and within the series arrangement of rectifier units each second junction between subsequent rectifier units being electrically connected to a corresponding metallic screen, while each junction following a junction which is connected to a corresponding metallic screen is free of an immediate connection to any of said metallic screens.
Claim 4
Dependent Claim
56 words
Rectifier apparatus as defined in claim 1 wherein the respective distances between the metallic screens and said screening plates are selected such that the capacitive displacement current flowing between one screening plate and a particular metallic screen is substantially equal to the capacitive displacement current flowing between the other screening plate and that same metallic screen.
Claim 5
Dependent Claim
50 words
Rectifier apparatus as defined in claim 3 wherein each of said screening plates is formed U-shaped and comprises two plate-like legs extending along opposite sides of said rectifier stack, both said U-shaped screening plates being arranged rectangularly with respect to each other in a cross-sectional plane of the rectifier stack.
Claim 6
Dependent Claim
26 words
Rectifier apparatus as defined in claim 1 wherein at least one of said screening plates forms a component part of a vessel surrounding the rectifier stack.