| 摘要 |
<p>A ballast circuit for starting and operating gaseous discharge devices includes a transformer which has a primary winding and a secondary winding. There are auxiliary windings electrically coupled to the primary winding, including electrode windings for providing energy to heat the electrodes of the gaseous discharge devices. There is a relay including a heater and a switch. The switch is normally open and closes in response to energization of the heater. The heater is connected to an auxiliary winding for energization when the primary winding is energized. The switch is connected in series with the secondary winding for providing operating energy to the gaseous discharge devices only when the switch is closed.</p> |
