基于噪声测量技术的开关电源故障诊断方法研究

摘要

The MOS devices,as a core of the switching power supply,working in high power electromagnetic flow is easy to be damaged,which can make the switching power supply work anormally,the problem of a proposed noise measuring technology of high failure rate is used to judge the working condition. This new method of fault diagnosis established a power MOS device noise model ,designed the low noise front low frequency amplifier ,and tested S-15-12 of Ilecco type switching power supply. The results show that the method can measure the low frequency noise of switching power supply and accurately determine its working status,and increase 65%than the traditional methods on accuracy. The typical fault diagnosis method of switching power supply provides a feasible and effective evaluation method.%针对开关电源的功率器件MOS管工作在高功率大电流下易损坏，导致开关电源故障率高的问题，提出了一种利用噪声测量技术来判断其工作状态的故障诊断新方法。建立了功率MOS器件的噪声模型，设计了超低噪声前置低频放大器，对伊莱科S-15-12型开关电源测试，结果表明，该方法能够测量到开关电源的低频噪声并准确判断其工作状态，且在准确率上较传统方法提高了65%，为开关电源故障诊断提供了一种有效的方法。