THREE-PHASE CONVERTER OF ALTERNATING VOLTAGE TO DIRECT VOLTAGE USING INTERMEDIATE FREQUENCY MULTIPLICATION Russian patent published in 2000 - IPC

FIELD: electric power supply equipment. SUBSTANCE: device has transformer, which single-path magnetic circuit carries two primary windings. First primary winding is connected in series to first controlled gate. Second primary winding is connected in series second controlled gate. Both circuits are connected to output of 8-arm bridge, which cathode group has controlled gates 7-10, and which anode group has gates 11-14. input of bridge circuit is connected to three-phase four-wire mains (A, B, C, 0). In addition, number of turns of first primary winding is greater than number of turns of second primary winding by factor of square root of 3. Windings are connected to by their opposite-pole terminals. Secondary winding of transformer is connected to diode bridge in order to produce direct voltage. Alternating constituent of voltage at its output has 12-time pulse frequency. This results in possibility to produce 3-time and 6-time multiple frequency at secondary winding using two primary windings. Controlled gates may be designed as turn-off thyristors or high-power transistors. EFFECT: increased functional capabilities. 4 cl, 5 dwg