| 摘要 |
<p>A three-phase bridge rectifier includes three bidirectional switching circuits (3R, 3S, 3T) each including a single-phase rectifier circuit (16R) having four single-phase bridge-connected diodes (15Ra, 15Rb, 15Rc, 15Rd) and a semiconductor switching element (17R) connected between DC output terminals (3Rc, 3Rd) of each switching circuit (3R, 3S, 3T), three AC side reactors (2R, 2S, 2T) each connected between one of two AC input terminals (3Ra, 3Sa, 3Ta) of each switching circuit (3R, 3S, 3T) and each one of output terminals (1R, 1S, 1T) of the three-phase AC power supply (1), three positive side diodes (5Ra, 5Sa, 5Ta) each having an anode connected to the positive side DC output terminal (3Rc) of each of the switching circuits (3R, 3S, 3T) and a cathode connected to a positive side DC bus (4a), three negative side diodes (5Rb, 5Sb, 5Tb) each having a cathode connected to a negative side DC output terminal (3Rd) of each of the switching circuits (3R, 3S, 3T) and an anode connected to a negative side DC bus (4b), a smoothing capacitor (6) including two capacitors (6a, 6b) series connected between the positive and negative side DC buses (4a, 4b) and a neutral terminal (7) connected to the other AC input terminal (3Rb, 3Sb, 3Tb) of each switching circuit (3R, 3S, 3T), and a control circuit (11) for controlling the switching elements (17R) of the switching circuits (3R, 3S, 3T). <IMAGE></p> |
