| 摘要 |
This device includes at least one transformer (9, 10, 11) supplied, at its primary (9) by a three-phase alternating current and delivering, on at least one secondary (10, 11), a three-phase current applied to rectifying means delivering, as output to the load, a rectified voltage and current, these rectifying means being of the type including, for each secondary, controlled semiconductor devices (15, 16). According to the invention, the rectifying means comprise a free-running circuit (19), the said controlled semiconductor devices being triggered with firing angles which are essentially variable, these being modified so as to increase the conduction period in the free-running circuit while at the same time decreasing the conduction period in the triggered semiconductor devices, and conversely, thus making it possible to deliver, to the load, an active power or a reactive power which is substantially constant despite variations in the impedance of the load. <IMAGE> |
