光电耦合器伏安特性数学模型

V-I Mathematical Model Characteristics of Optocouplers

为在电路设计中更方便和有效地使用光电耦合器,提出了光电耦合器伏安特性数学模型,目前还没有光电耦合器该方面资料。通过从理论上分析发光二极管和光电三极管的电流特性,推导出光电耦合器比较常用的光电三极管共射极工作方式的输入电压和输出电流的关系表达式,从而得到这种工作方式的伏安特性的数学模型。利用MATLAB对实验数据进行拟合,对比数据点与拟合的理论图形,认为该模型是正确的,该模型填补了光电耦合器在该方面资料的空白。

In order to use optical coupler more convenient and efficient in circuit design,a mathematical model was proposed for the I-V characteristics of optical couplers.There isn＇t information about the model currently.From the theoretical analysis for current characteristics of light-emitting diode and phototransistor,the relationship between the input voltage and output current was derived for the commonly used phototransistor optocouplers.Thus the mathematical model of this work pattern was accomplished.Using MATLAB to analysis the experimental data and complete the distribution fitting,comparing the data points and theoretical fitting graphics,the results confired that the model was correct.The model filled the information gaps in the field.