Fault Pattern Recognition Method for DC-DC Power by Using Output Voltage Waveform Analysis

DC-DC power module is the power supply for electronic system. With its wide range of applications in engineering equipment, the degradation and fault conditions have received increasing attention. Many researches on DCDC power tend to take some of their internal devices out of the test and analysis, and study the corresponding test methods, which are rapidly developing in single fault diagnosis. In this paper, a method is proposed for identifying fault patterns of DC-DC power. The fault characteristics of the internal components in the power module are determined by PSpice circuit simulation. The test signals are the output current pulse signal and the normal input voltage signal. After inputting the test signal, the fault diagnosis of optocoupler and MOSFET tube is realized by analyzing the output waveform. The result shows that the optocoupler has a great influence on the adjustment ability of the circuit anti-jamming. MOSFET tube has a great influence on the output voltage level.