Abstract
A positive buck-boost (PBB) converter is a known DC-DC converter that can operate in step-up and step-down modes. Unlike buck, boost and inverting buck-boost converters, the inductor current of a PBB can be controlled independently of its voltage conversion ratio. In other words, the inductor of PBB can be utilised as an energy storage unit in addition to its main function of energy transfer. In this paper, the capability of PBB to store energy has been utilised to achieve robustness against input voltage fluctuations and output current changes. The control strategy has been developed to keep accuracy, affordability and simplicity acceptable. To improve the efficiency of the system, a smart load controller (SLC) has been suggested. Applying SLC, extra current storage occurs when there is a sudden load change, otherwise little extra current is stored.
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