| 摘要 |
<p>The system has a feeder (d23) comprising a rectifier for rectifying alternating current voltage, and an output is provided on the rectifier to provide a rectified voltage. A chopper auxiliary arm is provided for chopping a primary voltage (Up), and a chopped signal is provided on an output of the chopper auxiliary arm. The output of the rectifier and the output of the chopper auxiliary arm are connected together to an output of the feeder to provide a direct current auxiliary voltage (UA) and auxiliary current (iA).</p> |
