Research and design on a robust sun-tracker

The utilization of solar energy efficiency depends heavily on the level of perpendicularity between sun light and solar panels, so a sun tracker is necessary for improve solar energy utilize. Base on the previous research, the existing problems which happened in the present solar tracker is discussed. Aim to omnidirectional tracking the sun position, a location detector consists of an omnidirectional photoelectric sensor and a PSD is designed. A Single-chip as the main procession power for acquires the four direction signals from PSD and control the step motor by the value of the voltage. According to the luminous intensity 2 tracking mode is designed. If luminous is available, light-electric track is started, otherwise, date-time calculate method use instead so as to realize automatic tracking uninfluenced by weather. According to the results of the experiments and systematic error analysis, the tracking accuracy of the proposed approach is less than 0.1deg with the field of view angle of 18deg and the stability of the tracker can work stability under all kinds of weather.