一种高可靠性的氙气灯启动控制电路

摘要

Based on the judgment of the start-up status by inspecting the voltage of the tube of the high intensity discharge (HID) lamps, the inverter in the ballast is controlled to implement the work pattern that the HID lamps are fired by DC and supplied by AC, the tube is fired driven by stable DC and avoids the arc blowout owing to the lack of constant voltage when the HID lamps reach polarity switching point of the inverter after its firing. After the success of firing, the HID lamps will be supplied by AC and enter normal work pattern.The DC makes the HID lamps easy to fire and supplying by AC ensures the balance of the tube of the HID lamps.The start-up circuit proposed here possesses the advantages mentioned above. Application of a HID-flashlight indicates that the start-up circuit is high reliable.%通过对氙气灯灯管电压的检测实现灯管启动状态的判决,控制镇流器中的逆变器实现直流启动、交流工作的启动控制模式,保证灯管在稳恒直流驱动下实现点火,避免了氙气灯在点火后遇到逆变器极性切换点,无法提供稳定电压而造成的熄弧,点火成功后控制逆变器采用交流方波驱动,进入正常工作模式.该方案兼有直流驱动易于启动和交流驱动正常工作灯管两端平衡的优点,在氙气手电筒中的应用情况表明,该启动控制电路具有极高的启动可靠性.