摘要
提出一种全新的应用于投影仪用金卤灯电子镇流器的数字化控制方案。采用了LCC的谐振启动方式,在控制时考虑了系统无源元件的偏差问题,提出了一种自适应的启动方式,提高了启动的可靠性并降低了系统的成本。在过渡阶段使用了开环控制方案,使过渡更加平稳,不会产生过大的电流和电压冲击。提出一种简单的闭环控制方案,使灯功率能够可靠闭环,不会出现功率过冲。对于金卤灯中常见的声谐振问题,此处采用高频调制的驱动方式。实验中,制作了一个150W的样机,经测试系统能够可靠启动、过渡平稳,稳态时功率恒定,系统效率高达93%且无声谐振现象发生。
A novel digital control theory for metal halide lamp electronic ballast used for projector is presented.The LCC resonant ignition strategy is adopted.Considering the tolerance deviation of the passive components,an adaptive digital control method for ignition which improves the reliability and reduces the cost of the system is proposed.Open-loop control is used in the transition stage during ignition to steadily increase the lamp power without large current inrush and voltage stress.A simple closed loop control method is presented to assure the reliable constant lamp power without any power over shooting.High-frequency modulation drive method is adopted to overcome the acoustic resonance problem commonly shown in metal halide lamp.Finally,a 150W prototype was built in lab,and tests show that the electronics ballast can ignite reliably with a smooth transition stage;steady state constant power can be guaranteed.Total efficiency of the system as high as 93% is achieved without acoustic resonance.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第4期166-172,共7页
Transactions of China Electrotechnical Society
基金
黑龙江省科技计划(GC07A302)
黑龙江省重点科技攻关计划(GB02A105)资助项目
关键词
金卤灯
电子镇流器
谐振启动
数字控制
闭环控制
声谐振
Metal halide lamp
electronic ballast
resonant ignition
digital control
closed loop control
acoustic resonance
