Design of an Analog Control Circuit for the Automatic Sun-Tracking PV Bracket System

This paper designed an analog control circuit which can automatically track the sun for PV bracket system to improve the solar cell photo-electricity conversion efficiency. The sunlight intensity can be real-time detected by sampling the short-circuit current of solar cell. The PV bracket system can be automatically adjusted to achieve a final horizontal angle and pitch angle by using the hysteresis comparator and dedicated motor driver chip, which always makes photovoltaic modules toward the sun's position. At the same time, the PV bracket system can be automatically reset by the hall switch when the sun reaches the sunset and the light intensity is less than the reference value. The experimental prototype is used to testify the correctness and reliability of the control system, which has better practicability and value to extend.