| 摘要 |
A control gear for a high intensity discharge lamp comprising a switch element, and an oscillator connected to drive the switch element through the intermediary of a variable mark-space ratio driver arrangement. The switch element switches current in a series resonant circuit including the primary winding of a transformer, across the secondary winding of which the lamp is connected. A feedback circuit which receives signals controls the mark-space ratio to regulate the power consumed by the lamp in a closed loop. Initially, the mark-space ratio is set at a starting level such that a very high voltage is generated in the resonant circuit to cause starting of the lamp.
|
