A power supply might have passed the MIL standards, however retrofitting it into a system may still have compatibility
issues. To investigate such issues in power supplies fitted in a fighter aircraft, modeling and simulations of one such
power supply is carried out with the help of PSPICE. Conducted EMI performance of this power supply is analyzed and
various steps towards EMI mitigation, like use of snubber circuits and RC gate control, are studied with the help of
simulations. The DC bus is modeled by taking into account the transmission line parameters. When power supplies
having high frequency switching rates are connected across this DC bus, they generate switching reflections. The
interaction between these inter-connected on board power supplies produces time varying loads whose sudden rise and
fall times generate high frequency signals on the common DC bus voltage, which, in turn, causes increased EMI. An
experimental set-up is established in the laboratory to verify the simulation results. All the results of this study are
presented. It is observed that by proper modeling and with the help of simulation tools, the EMI issues can be studied at
the design stage itself which saves both time and costs, as there is no need to construct a prototype for EMI
investigations.
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