Application of design of experiments in accelerated degradation testing of new energy low voltage electrical appliances

With the continuous development of the new energy industry, the lifespan requirements for low-voltage electrical appliances are increasing, and the time cycle for verifying lifespan is getting longer. Traditional testing methods no longer meet these requirements. Therefore, it is necessary to introduce accelerated degradation testing technology to shorten the testing cycle. The currently commonly used accelerated degradation method considers only a single stress factor. However, an electrical appliance is subjected to various stresses simultaneously during actual usage. These stresses affect the rate of degradation to varying degrees. A single stress factor cannot reflect the actual degradation effect of the appliance. The Six Sigma design and one of its tools, the Design of Experiments (DOEs) method, are presented here. Experiments show that the DOE method can identify key stress combinations in multiple stress sources. It can improve the efficiency of acceleration factor combination selection, derive the maximum degradation range of key accelerated stress factors, and then generate a DOE test scheme. Through the analysis of the experimental results, it is further verified that the degradation of the key stress factors combination can effectively improve the efficiency of product testing. Meanwhile, the value of key stress factors obtained by DOE has a great influence on the degradation effect.