| 摘要 |
PURPOSE:To obtain an AC power supply device having high voltage DC as a power source by using switching elements as small number as possible by connecting two inverter circuits to a DC power supply, and commonly connecting the secondary sides of transformers correspoding to the respective circuits. CONSTITUTION:Inverter circuits IV1, IV2 formed of 6-phase bridge circuit of high harmonic wave current preventive reactor L1 and capacitors C1, C2 of series circuit are connected through a high velocity breaker HB to a DC power supply ED, and the neutral point P1 of the capacitors C1, C2 is connected to the midpoint P2 of two sets of bridge circuits. The outputs of the inverter circuits IV1, IV2 are synthesized through transformers T1, T2 to 3-phase AC to obtain an output voltage V0. Both the transformers are so wound and determined in winding type that the respective load capacities become equal to each other simultaneously when the inclusive high harmonic waves become less. In this manner it can obtain an AC power supply device having high voltage DC as a power source by using switching elements as small number as possible and can still obtain equivalent performance to the conventional one in waveform distortion rate. |
