| 摘要 |
A high voltage power supply used to transfer three-phase a.c. energy to d.c. at full rated power over a large range of output voltages. The electric and magnetic circuits are arranged according to the core type of construction wherein three legs of the iron core extend axially and have the primary coil wound along their full length. The core legs are joined for magnetic circuit continuity at the extremities. A plurality of high voltage decks each having three secondary winding modules mounted and interconnected are stacked axially over the axially extending iron core pieces. The secondary coils on each high voltage deck are interconnected in several three-phase connections, to produce a phase shift in the ripple of the d.c. output voltage of the various decks. A high voltage bridge rectification circuit mounted on each deck produces full wave rectification of the ouptut. Each high voltage deck provides a contact which is engaged selectively by contacts mounted on an axially extending rotary switch whose angular position varies the interconnections of the high voltage decks to produce a range of output voltages at the full rated power of the transformer. A counterbalance circuit to reduce any residual voltage ripple component at multiples of the input frequency includes the application of an a.c. voltage of proper phase and amplitude supplied at the ground return lead of the series-parallel connected high voltage decks. The counterbalance voltage is applied by way of an additional secondary winding of a few turns coiled over the three legs of the transformer core, but is completely independent of the primary and secondary windings. The number of turns of the additional winding and the leg from which the voltage is taken are determined empirically.
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