| 摘要 |
In a lighting system 10, a voltage pulse clamping device 12 is connected across a ballast coil 20. The clamping device 12 regulates the ignitor output voltage pulse applied to high intensity discharge lamps during startup. The ignitor pulse is developed by an ignitor pulse circuit connected to the lamp 14. The voltage clamping device 12 ensures that the ignitor output voltage does not exceed the maximum voltage rating of the lamp 14 being used, regardless of component tolerances or variations in the power supply 24 line voltage. Lamp 14 performance can be increased by the application of the appropriate voltage pulse to the lamp 14, thereby avoiding degradation of the lamp ballast due to excessively high ignitor pulses.
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