蒋保涛,周莉莉

摘 要:无机电致发光是一项新兴的显示技术,由它所代表的冷光技术具有发光面积大,发光柔和均匀、重量轻、耗电量少、厚度薄且具有弯曲弹性等优点,因此应用非常广泛,但无机电致发光的微观世界难以直接观测。在此设计一款测试电源,通过测试冷光片的驱动电压、电流等参数指标,为分析发光机理提供一定的依据。方法是利用单片机控制和功率变换技术,设计出电压、频率、占空比均可调的测试电源。通过测量两种型号的发光片,证实该电源工作稳定,性能可靠,能够应用于无机电致发光材料的研究性测试和应用型测量。

关键词:无机电致发光;降压斩波;全桥变换;测试手段

中图分类号:TN402,TN4022文献标识码:A

文章编号:1004-373X(2009)20-205-04

Development of Inorganic Electro-luminescence Measuring Power Supply

JIANG Baotao,ZHOU Lili

(Wuhan Vocational College of Software Engineering,Wuhan,430205,China)

Abstract:Inorganic electro luminescence is a rising display technology.The luminescence technology has many merits which include large light area,softness and uniformity light,gently weight,little energy cost,thin thickness,flexion and flexibility.So it can be applied widely.But the microcosm of inorganic electroluminescence cannot be directly observed.A power that can do the analysis of luminescence mechanism through measuring its driving voltage and current is designed.Technique of the design includes the use of single computer control and power convert technology.Through the test of two type luminescent film,it has been proved that the power works stably and reliably,and can be used in research testing and application-oriented measurement on inorganic electro luminescence stuff.

Keywords:inorganic electro luminescence;buck chopper;full-bridge converter;measuring methods

0 引 言

无机薄膜电致发光[1]是高场发光,迄今最有效的无机电致发光薄膜材料是Ⅱ-Ⅵ族化合物,如ZnS,SrS(CaS)等[2]。到目前为止,无机电致发光冷光片已经广泛应用于日常生活中,但它的发光机理、光电特性、发光性能尚需深入研究。为此,这里研究的重点内容是设计一款电压、频率、占空比均可调的驱动电源,用于测试EL冷光片,以便找到检测检测冷光片质量的快捷方法,并可以探讨发光机理提供实验数据。

1 电源设计综合指标

在参考各冷光片驱动电源制作厂家的实际工作经验参数的基础上,给出如下EL冷光片测试电源设计指标:

(1) 输出峰值电压:Vp=0~200 V连续可调;

(2) 输出峰值电流:Ip<2 A;

(3) 交变频率:f为20 Hz~2 kHz连续可调;

(4) 输出功率:P0<400 W;

(5) 占空比D为5%~45%连续可调。……