| 摘要 |
The present invention offers a three-phase converter which conforms to the higher harmonics regulations. According to the present invention, in a converter comprising three AC reactors, a three-phase diode bridge, a plurality of smoothing capacitors connected in series between the DC output side of the three-phase diode bridge and a DC load, two flywheel diodes connected to positive and negative terminals on the DC side of the three-phase diode bridge, respectively, a reactor inserted between the midpoint of the two flywheel diodes and the midpoint of the smoothing capacitors, three both-way energizing switches arranged between the AC side of the three-phase diode bridge and the midpoint of the two flywheel diodes, and a controller for controlling the three both-way energizing switches, the three both-way energizing switches are controlled to reduce higher harmonic components of power source current and, by means of the reactor interposed between the midpoint of the two flywheel diodes and the midpoint of the smoothing capacitors, reverse recovery currents of the three-phase diode bridge during turn-on of the three both-way energizing switches are suppressed. |
