Averaged modeling of transformer-coupled interleaved boost converters

Modeling Phase Interactions in the Dual-Interleaved Buck Converter Using Sampler Decomposition

“…The closed-loop reference-to-phase current transfer functions may also be derived assuming non-delayed operation of the samplers in the control-loops, which is the conventional modelling approach [5,7,8], resulting in identical transfer functions for each phase since the phases are assumed to have the same component values:…”

“…This technique is used in many applications ranging from low voltage power supplies to the high power converters within an electric vehicle power train [1]- [4]. Individual average phase current feedback is often used to balance the phase-currents in interleaved systems [5]- [8], but can result in phase interaction and instability, which is not predicted by standard averagevalue modelling techniques. The instabilities can be at quite low frequencies, around 1 kHz, and can place significant limitation on the parameters for the phase-current controllers.…”