The Failure Analysis of EMI Filter and DC/DC Converter Module
The EMI filter and DC/DC converter module in hybrid integrated process are widely used in military field. Since the power supply needs continuous operation and withstands the test of harsh environment conditions,the failure of EMI filter and DC/DC converter module happen on occasion. The failure cases of filter and converter module in an equipment are analyzed,the hybrid integrated circuit failure analysis methods are introduced in detail,the idea of the hybrid integrated circuit failure analysis is put forward,the failure causes and mechanisms of filter and converter module are found,and the corresponding improvement measures are proposed,which provides a reference for the failure analysis of converter module. After failure analysis,it is found that the reason for the failure of the filter and converter module is the damage to the internal resistance of the power module,and microcraks propagates and the resistance opens during use,which causes the MOSFET connected to it to burn out due to excessive power and the input and input ground of the power moduce are short circuited. The short-circuit power module leads to the short out between the output of the filtering module and the output ground,which results in a large current,and causes the substrate to overheat and some component solder joints fall off. As a result,the filter module has no output.
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