On-line parameter estimation of non-minimum phase switch mode power DC-DC boost converters

Time varying parameters, such of passive components within the circuit and load elements, can significantly impact on the control and voltage regulation of power electronic systems, such as switch mode power converters (SMPC). Therefore, there is increasing interest in parametric system identification and adaptive control techniques to optimize system performance. Most literature focuses on the DC-DC buck converter. However, unlike the DC-DC buck converter, the boost converter has two left half-plane poles (LHP) and one right half-plane (RHP) zero in its mathematical model. The existence of a RHP zero in the s-domain transfer function causes a zero to be outside of the unit cycle in the discrete model. As a result, system identification of the boost converter is much more difficult in comparison to the buck converter. The paper sets out to illustrate the RHP zero problem in detail and propose a novel method to resolve this problem.