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In this paper, the pulse with modulation as switching strategy for neutral point type buck-boost converter is introduced. The proposed control strategy is implemented and applied to electronic ballast by using neutral point type buck boost converter. The circuit is composed from two ideal switches and Metal Oxide Semiconductor Field Effect Transistor which in its common source configurations used as switching technique. Switching model is developed in Matlab/Simulink on order to control neutral point type buck boost converter. This has resulted to reduction in harmonics current. In realizing its effectiveness and performance, the proposed switching technique has been applied to electronics ballast and lamp. Results obtained from the study indicate that the proposed switching technique is feasible for further applications.

The renewable-energy sector is fast gaining ground as a new growth area for numerous countries with the vast potential it presents environmentally and economically. Solar energy plays an important role as a primary source of energy, especially for rural area. This paper presents the design and development of high-efficiency dual-axis solar tracking system using Arduino platform. Furthermore, the ultimate objective of this project is to trace the maximum sunlight source to power the solar panel. The project is divided into two stages, which are hardware and software development. In hardware development, five light dependent resistor (LDR) has been used for capturing maximum light source. Two servo motors have been used to move the solar panel at maximum light source location sensing by LDR. Moreover, the code is constructed using C programming language and targeted to Arduino UNO controller. The efficiency of the system has been tested and compared with static solar panel on several time intervals, and it shows the system react the best at the 10-minutes intervals with consistent voltage generated. Therefore, the system has been proven working for capturing the maximum sunlight source for high efficiency solar harvesting applications.