AC-TO-DC VOLTAGE CONVERTER Russian patent published in 2003 - IPC

FIELD: converter engineering; dc power supplies for loads responsive to voltage ripples. SUBSTANCE: converter has two power transformers whose primary windings are star- and delta-connected, respectively, and secondary windings are delta-connected; it also has parallel-connected diode bridges. Each delta-connected phase secondary winding of any of these transformers has only taps (that is it has no leads from terminals a, b, c) which divide it into three parts so that turn ratio of these parts is For instance, phase winding ax has only taps a₁ and a₂, turns of parts aa₁, a₁a₂ and a₂x meeting given equation. Likewise for turns of other windings Similar mathematical expressions can be used for illustrating turn ratio of transformer 2. Taps are connected to input of twelve-phase bridge built around diodes with its four three-phase rectifiers connected in parallel. Load is connected to rectifier bridge output. EFFECT: provision for twenty-four fold ripple frequency. 1 cl, 3 dwg