| 摘要 |
<p>Sometimes a discharge lamp is operated with two heated electrodes while still running the feeding auxiliary installation after the start of the lamp. The invention reduces these unnecessary losses. To this effect, each electrode (13, 14) is provided with a parallel diode (D46, D47) so that, in each half-cycle of the main a-c voltage source (C23) the only conductive diode is the one connected to the negative electrode which is the emitter electrode in that half-period. The voltage on the emitter electrode is thereby limited to 1 volt whereas it would be higher without a diode. </p> |
