交流电致发光屏功耗测量

本文分析了目前测交流电致发光屏功耗通用的补偿法所存在的问题,并通过计算导出此法适用的范围.在此基础上设计了交流电桥法,直接测量发光屏等效电阻和等效电容,通过等效电阻计算发光屏功耗.这样,克服了补偿法存在的问题,并在一定程度上消除了发光屏非线性阻抗特性对功耗测量的影响.

THE MEASURING METHOD OF POWER CONSUMPTION FOR ACEL PANEL

The power consumption of ACEL panel is usually measured by a bridge circuit shown in Fig.1.However,it is suitable only in a limited range.In some,it is found in the experiments that:1)the measured value of power consumption car.es depends on the resistance R in the circuit;2)The measured total power consumption when several panels are connected in parallel is smaller than the sum of the power consumption of these panels measured separately.Analysis has shown that this circuit is only suitable for the panels whose resistance is very high and whose capacitance is very low.In addition,the nonlinear nature of the ACEL panels causes larger experimental error.A improved bridge circuit for measuring the power consumption is designed in this paper.Monitoring the change of the phase difference and current,we can easily adjust both the compensation resistor and capacitor to bring the bridge to the equilibrium.Then the resistance of the panel can be determined directly.The new method overcomes the problem mentioned above and has higher sensitivity and precision.Also the nonlinear nature of the panel has little influence for the result of the measurement.