In order to solve the problem that the attenuation degree of the forward current transfer ratio(CTR)of the optocoupler cannot be quantitatively evaluated in the traditional study on aging of optocoupler devices,a quantitative functional relationship between the CTR,thermal stress and working time of optocoupler devices is proposed.Firstly,the aging test device of the optocoupler is designed,and the thermal aging test is performed on the optocoupler,and the CTR attenuation of the optocoupler is monitored and recorded.In the simulation software,the test data are fitted exponentially,and the correctness of the fitting function is checked.Finally,the quantitative relationship between the working time and the output current at the operating temperature of the optocouple is obtained,and the thermal aging model of the optocouple is obtained.The results show that the aging model is in good agreement with the experimental data.
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