Power supply apparatus
AssigneeLeybold-Heraeus GmbH
InventorFriedrich-Werner Thomas
Life of this patent
Estimating the term…
Abstract
A power supply apparatus, in which the three phases of an alternating-current main are connected each through rectifier elements connected in antiparallel to the primary winding of a three-phase transformer. The secondary windings of this transformer are connected through rectifiers to a load device, such as an electron beam gun or other such device which produces short-circuits while in operation. Measuring sensors are provided on the primary AC side which, in the presence of an excess current on the primary AC side, block controlled rectifier elements. The blocking takes place very rapidly because GTO thyristors are used as rectifier elements. The decay of the magnetic energy in the transformer is achieved by the fact that the primary side of this transformer is connected in delta.
Claims10
Power supply apparatus comprising:
- controlled rectifier elements connected in antiparallel relation and all being gate-turn-off thyristors;
- a three-phase transformer having primary windings connected in delta and having secondary windings;
- means for connecting the three phases of a three-phase main each through said controlled rectifier elements connected in antiparallel relation to said primary windings of said three-phase transformer;
- rectifiers;
- load terminals fed by said secondary windings through said rectifiers on a direct current side;
- and
- measuring sensors on the primary-side alternating-current side of said transformer, which, in the presence of an overload on the primary-side alternating current side, block said controlled rectifier elements.
Dependencies are inferred from the claim text.