Abstract

Non-inverting Buck Boost converter (NIBB) is a versatile interfacing circuit with wide voltage regulation capability. It can work in Buck mode, Transition mode and Boost mode with high operating efficiency. At the same time, the three different working modes also have different dynamic properties. With the consideration of NIBB dynamics at all three working modes, NIBB is first modeled as a linear parameter varying (LPV) system. Based on the LPV system, a digital linear controller synthesis method is proposed with linear matrix inequity (LMI) approach and applied for different Transition modes. The developed controllers are comparatively evaluated through experimental results, in verification of the analysis results.

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