| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the potential to the ground of each part of converters by connecting the neutral point of capacitors of an alternating-current input filter, comprising the capacitors and reactors, and the neutral point of capacitors of an alternating-current output filter, comprising reactors and the capacitors, to one line in a direct-current circuit. SOLUTION: Star-connected capacitors 2-4 are placed between an alternatingcurrent power supply 1 and reactors 5-7, and the neutral point of the star-connected capacitors 2-4 is connected to the negative side of a capacitor 20. Star-connected capacitors 38-40 are placed between a load device 41 and reactors 35-37, and the neutral point of the star-connected capacitors 38-40 is connected with the negative side of the capacitor 20. This eliminates fluctuation in voltage at each part of converters caused by the carrier frequency component of a rectifier and the carrier frequency component of an inverter, stabilizes the potential to the ground of each part of these converters, and prevents malfunctions of peripherals. |
