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US 4,400,629 AGranted
Delta-star connection
AssigneeSchaltbau Gesellschaft mbH
InventorErnst Kratzmair
Life of this patent
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Abstract
A three-phase circuit, either load impedances or transformer windings for feeding such load impedances, are connected in a delta circuit configuration by a first group of controllable semiconductor elements and in a star circuit configuration by a second group of such elements. All elements are fired, but at different phase angles for operatively establishing a star, a delta, or a mixed type of connection.
Claims7
A circuit for the selective connection of a three-phase load in a delta and a star circuit connection, comprising:
- a first group of controllable semiconductor elements connected to said three-phase load for completing a delta circuit for the three-phase load;
- a second group of controllable semiconductor elements connected to ends of the three-phase load for completing a star circuit for the three-phase load;
- and
- control circuit means connected to the elements of said first and second groups and providing firing pulses to said elements for always operating both of said groups but with different firing delays.
1 more element
Dependencies are inferred from the claim text.