Sun-tracking controller

The present invention relates to a single-shaft controller for tracking a sun track automatically. The controller is equipped with a high-precision sensor, a low-precision sensor and a sunlight intensity sensor. A shielding switch is arranged between the high-precision sensor and a motor driver, and the output end of the sunlight intensity sensor is electrically connected with the control end of a sensor power supply switch. A tracking process comprises two closed loop control modes of a rough-fast mode and a precise-slow mode. When the direction of a concentrator deviates a larger angle from the position of the sun, a tracking system firstly enters the rough-fast control mode to adjust the direction of the concentrator nearby the position of the sun within a shorter time, and then enters the precise-slow control mode, thereby achieving the purpose of tracking the sun rapidly and precisely. When the sun is shielded by a cloud layer, and a radiation intensity is very low, the sunlight intensity sensor cuts off