| 摘要 |
Voltage inverter provided with four switching cells (Q 1 to Q 4 ) to be connected to the terminals of a DC voltage source (Vdc), each comprising two semiconductor switches (I 11, I 12, I 21, I 22, I 31, I 32, I 41, I 42 ) installed in series, these switches having a common point (A 0 ) to be connected to an AC current source (Mac) with three phases (p 1, p 2, p 3 ) and a neutral (n), the connection being made onto one phase (p 1, p 2, p 3 ) for three of the cells (Q 1, Q 2, Q 3 ) and onto the neutral (n) for the fourth cell (Q 4 ). Each cell (Q 1 to Q 4 ) cooperates with a semiconductor electrical isolating device (S 1, (S 2.1 and S 2.2 )) to be put into a turn-off state if the cell should fail, this isolating device (S 1, (S 2.1 and S 2.2 )) being arranged either on the connection to the AC current source (Mac), or on connections to the terminals of the DC voltage source (Vdc).
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