Abstract
A photo voltaic-battery powered, single switch DC-DC converter system for precise control of voltage for a low power application is presented in this paper. The converter is composed of buck converter and a buck-boost converter sharing a single switch. The converter allows you to implement maximum power point tracking, battery charging, and load voltage regulation simultaneously. The MPPT and load voltage regulation is achieved by controlling duty ratio and switching frequency of the switching pulse. Hence the buck converter will be working under discontinuous current conduction mode which enables to adjust the impedance by changing switching frequency and thus by achieving the MPP. Whereas the buck-boost converter will be working under continuous current conduction mode and output voltage regulation is done by changing duty ratio. The algorithm used for MPPT is incremental conductance algorithm which gives satisfactory results on most conditions. For the protection of battery from overcharging, the system will comes out from incremental conductance algorithm and provides a constant charging voltage the battery. The proposed system is tested under MATLAB SIMULINK 2016 and satisfactory results are obtained.
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