Hybrid Control Method for Optimal Transient Response and Output Filter Minimization for Buck-Boost type Converters

摘要

This paper introduces a new digital control methodology for indirect energy transferconverters that is based on a hybrid controller concept. During transients, the control setsboundaries for inductor current and the output voltage based on the load conditions and thesystem requirements to facilitate rapid recovery and small output voltage variations. Oncethe output voltage is recovered, linear current programmed mode control operation isresumed. The control method significantly reduces the component stress requirements whichleads to a smaller volume converter and can be realized on any digital current programmedmode control platform with very few additions. The operation of the controller was verified bysimulation and experiments which found the new control scheme superior over theconventional linear control and time-optimal nonlinear control methods.