| 摘要 |
A power conversion device able to supply a constant load voltage even when the voltage of a 3-phase alternating current power supply fluctuates. A series circuit formed of switching element Q1 and switching element Q2 and a series circuit formed of switching element Q3 and switching element Q4 are connected to both ends of direct current power supply series circuit 3 formed of direct current power supply Psp and direct current power supply Psn, a bidirectional switch element S1 is connected between alternating current output terminals U and R, a bidirectional switch element S2 is connected between alternating current output terminal U and neutral terminal O, a bidirectional switch element S3 is connected between alternating current output terminal W and neutral terminal O, a bidirectional switch element S4 is connected between alternating current output terminal W and terminal T, and alternating current output terminals V and terminal S are connected. |
| 主权项 |
1. A power conversion device that outputs a 3-phase alternating current voltage based on first and second line voltage commands, the power conversion device comprising:
first, second and third input voltage terminals for receiving first, second and third input voltages from a 3-phase alternating current power supply; a direct current power supply series circuit supplying positive and negative voltages, wherein the direct current power supply series circuit includes a first direct current power supply and a second direct current power supply connected together in series, a neutral terminal, which is a series connection point of the first direct current power supply and the second direct current power supply, being connected to the third input voltage terminal; means for selecting a first line voltage from a first voltage group in accordance with a first line voltage command, the first voltage group consisting of a zero voltage with the potential of the neutral terminal, the positive voltage, the negative voltage, and the first input voltage; means for selecting a second line voltage from a second voltage group in accordance with a second line voltage command, the second voltage group including the zero voltage, the positive voltage, the negative voltage, and the second input voltage; and means for outputting the first line voltage to a first alternating current output terminal, the second line voltage to a second alternating current output terminal, and the third input voltage to a third alternating current output terminal. |
