This paper presents the design and implementation of a digital high- performance
photovoltaic lighting system based on a microcontroller. The proposed system consists of a photovoltaic module, a LED lighting module, a bi-directional buck-boost
converter and a battery. In the paper, battery
charging methods are analyzed first, and then, the control strategy and hardware implementation are proposed. The dimming control methods for LED are discussed and compared. The bi-directional buck-boost converter is the integration of a charger/discharger and a LED lighting-module drive circuit, which can fulfill maximum power point tracking (MPPT), multi-stage
current charging control and LED drive control. In addition, a microcontroller (PIC16F873) is used to realize the system controller.
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