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US 4,232,235 AGranted
Combining thyristor circuits of various circuit configurations
AssigneeBBC Brown, Boveri & Company, Limited
InventorsWerner Faust, Peter Etter
Life of this patent
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Abstract
Thyristors included in circuit configurations are, in turn, connected in series circuit fashion such that n circuit configurations are so interconnected, where n is a real integer equal to or greater than 2. The circuit configurations provide a combination of functions such as current limiting, voltage distribution, assumption of storage load, limitation of commutation voltage and limitation of search voltage. The combined circuit configurations provide the most practical arrangement of desired characteristics to meet the requirements for specific applications.
Claims12
A circuit, comprising:
- (A) first and second nodes;
- (B) an input and an output lead connected to said first and second nodes, respectively, each of said input and output leads adapted to be coupled to an external circuit;
- and
- (C) a thyristor circuit including first and second parallel branches each coupled between said first and second nodes;
- (1) said first branch consisting of a thyristor, the anode of said thyristor being directly coupled to one of said first and second nodes, the cathode of said thyristor being directly coupled to the other of said first and second nodes;
- and
- (2) said second branch including a plurality of series connected sub-circuits, each of said sub-circuits including at least one electrical element, at least two of said sub-circuits having different voltage-current characteristic curves, at least one of said sub-circuits including first and second sub-branches connected together in parallel, said first sub-branch containing a controlled avalanche diode comprising first and second series connected diodes connected in opposed polarity fashion and exhibiting controlled avalanche behavior, and said second sub-branch including a resistor.
4 more elements
Dependencies are inferred from the claim text.