Response of a switched dynamical system to intentional EMI

During testing of various systems to pulsed electromagnetic illumination, it is observed that long pulse electric fields upset electronic systems at lower threshold peak fields than short pulse trains. This phenomenon was discussed for a Chua circuit by these authors in earlier papers. The Chua circuit is a well-known example of circuits that easily go unstable or transition to chaos. In this paper, we demonstrate a similar effect with a more realistic circuit: a dc-dc Buck converter. Functional models using SCICOS are used to demonstrate that this circuit goes unstable at lower thresholds as shorter pulses are injected into the supply voltage of the Buck converter.