文档介绍：摘要随着国内城市建设的投资力度加大,城市道路美容亮化工程的实施,使照I别电器产业获得高速发展的机遇,而由于金属卤化物灯具有最好的显色特性和高的光效使它在众多的公共场所得:lrlj一泛的应用。现国内金卤灯的生产企业育30多家,一年的金卤灯产量达1千多万只,且上述企业中有很多家与欧美企业合作, 提高产品的质量与扩大生产规模,总的来说金卤灯生产线的引进将加·Ⅳ!国内企业的技术改造、技术进步和生产水平的提高,用国外的先进技术提高产品质量和档次,发展规模经济,在今后JL年金卤灯将有较快的发展,而相对应的金卤灯电子镇流器由于技术方面的原因没有得到应有的发展。现有的金卤灯电子镇流器有如下缺点: l、幻使用一段时间后,灯管的启动电压会不断升高,使灯难以启动点燃。 2、由于采用通用集成电路,尽管控制电路十分复杂,电路的保护功能仍然彳i足。 3、灯熄灭后不能快速的重新启动点燃。现在我采用复旦微电子的专用集成电路FM2822,设计制作了新型的金卤灯电子镇流器,采用了以下新的技术: 1、灯在启动点燃过程中,工作频率自动扫描,可以使灯每次都获得嘏高的启动电压,确保灯的启动点燃。 2、本电路能非常好的适应灯管在电压击穿进入辉光放电时的负阻特性(即当灯电流不断增加时灯管的两端电压急剧下降)。 3、工作电路简单,具有完善的保护功能(具有灯开路保护,过压保护,电流短路保护,容性模式功能保护等)。 4、能大大缩短再启动点燃的时间。 AbStract With the development of infrastructure and the 1ighting project on the City streetS,the lighting electroniCS products industry es a fast development of the best feature for color and 1ighting,Metal Halide Lamp(MIlL)e popular inpubliC are about 30 manufactures of MIIL in mainland China and the annually productivity the cooperation with North Amer dca and panies,most manufactures improve their product qua]j ty and enlarge the productivity and fasten their revolution of technology. 1t iS estimated that in the next few years,both the technology and productiVity ofMML will have afast development,while theMHL E1ectroniC Ballast wili hardlY be pletely because of the technologv ings. The ings of MHL electronic ballast are as follows: 1、After operating for aperiod of time,the start—up voltage will keep rising which makes the ligh Ls hardly be ignited. 2、 With the general integrated protect Circuit carl flardlY function well. 3、The light can hardly be restarted after turl2ed off. Idesign MHL electroniC ballast with FM2822 and the features are as f0110WS: 1、During the lamp igniting,operating frequency iS swept down automatically to gain themaximam start—up voltage,thus to ensure the essful ignition. 2、The Circuit iS well adaptable to the lamp negative impedance characteristiCS when entering the glow discha