| 摘要 |
<p>The energy supply has a transformer (13) with 2 primary windings coupled via a DC/AC converter (7..9, 14, 15) with controlled thyristors (14, 15) to a rectifier (6), in turn coupled to the current collector rails (ZS). The thyristors (14, 15) are each coupled to a firing and extinction device (36, 37) providing pulse width modulation control, to allow the secondary voltage provided by the transformer (13) to be held constant. - Pref. the transformer secondary voltage is supplied to main and auxiliary heating devices (21, 22).</p> |
