A generalized terminal modeling technique was proposed earlier to predict conducted electromagnetic interference from a dc-dc boost converter. The predictions of these conducted emissions showed that there was a good agreement up to 50 MHz. This paper extends the generalized terminal modeling approach to converters with the buck-type input. Both dc and ac applications are discussed. The technique is developed for the electromagnetic interference modeling of switched power converters in aerospace applications where the requirements on electromagnetic pollution are very strict. The model is shown to successfully predict conducted emissions for a buck converter and a three-phase voltage source inverter up to 100 MHz with an error of 6 dB or less at most frequencies

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A generalized terminal model has been proposed to predict the conducted electromagnetic interference (EMI) from a boost converter. The results of conducted emissions have shown a good agreement up to 50 MHz. The same technique was also successfully applied to extract a terminal model of buck converter. This paper extends the generalized terminal modeling approach to a larger class of power converters by attempting to model a dc-ac converter from the dc terminal side. Modeling the terminal behavior of an ac system is more challenging than it is for dc-dc converters because of the timevarying converter operating point. The proposed technique is applied to a single-phase half-bridge inverter to show its versatility in modeling conducted emissions from ac systems. Measured and predicted conducted emissions from a half-bridge inverter are in a good agreement within 6 dB up to 30 MHz.

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