| 摘要 |
<p>A frequency converter assembly comprising an input for supplying electric power having an input frequency into the frequency converter assembly from a supply network; a direct voltage intermediate circuit (4; 4') comprising capacitor means (C4; C4'); at least one controllable switch, the switch being electrically positioned between the input and the direct voltage intermediate circuit (4; 4'); an output for supplying electric power having an output frequency from the frequency converter assembly; and control means (8; 8') arranged to control the at least one controllable switch. The control means (8; 8') are arranged to provide a recovery function to recover the capacitor means (C4; C4') by supplying restricted recovery current from the supply network to the capacitor means (C4; C4') through the at least one controllable switch, the control means (8; 8') being arranged to prevent supply of electric power from the direct voltage intermediate circuit (4; 4') towards the output during the recovery function.</p> |
