Sunlight tracking sensor

Abstract

The invention provides a sunlight tracking sensor at least comprising a light signal detector fixed on a photovoltaic component and facing to the same direction with the photovoltaic component. The light signal detector comprises multi-quadrant light sensors and a controller. Each multi-quadrant light sensor comprises a signal output end corresponding to each quadrant and a shielding structure. The multi-quadrant light sensors are partitioned according to each quadrant. The controller is connected to the light signal detector and a motor device, and is used for receiving and processing electrical signals outputted by each output end of the light signal detector. Sunlight tracking by the photovoltaic component is realized by the motor device controlled according to correspondence of current values of the light sensor. The sunlight tracking sensor is low in cost, simple in structure, high in tracking accuracy, more sensitive to light with a small incident angle, and large in accurate tracking range, and can be applied in the field of sunlight tracking on a large scale.

Description

technical field [0001] The invention belongs to the field of solar energy application equipment, in particular to a solar light tracking sensor. Background technique [0002] In the context of various energy crises, solar energy is attracting more and more attention, and solar trackers are an important part of photovoltaic equipment, and their tracking accuracy directly affects the efficiency of the entire photovoltaic system. At present, the method of tracking the sun mostly adopts the form of solar tracking and photoelectric sensor tracking. As the core component of photoelectric tracking, the photoelectric sensor has the characteristics of non-contact, fast response, low cost, light weight, reliable performance, and no electromagnetic interference. Advantages, so photoelectric tracking sensors are widely used. [0003] However, the general photoelectric sensor often ignores the tracking range factor when ensuring high precision, resulting in the sensor often failing to s...

AI Technical Summary

Problems solved by technology

[0003] However, the general photoelectric sensor often ignores the tracking range factor when ensuring high precision, causing the sensor to often fail to search for the sun due to the small tracking range

Such as the traditional light tube type, such as figure 1 As shown, it is composed of four-quadrant photocell and light tube. The light tube has good shielding performance, less influence of external interference light, and high tracking accuracy. However, it has a small tracking range and cannot complete large-scale tracking.

like figure 2 As shown, the traditional partition type is to directly connect the output terminals on both sides to the positive and negative input terminals of a comparator, and judge the sun position by the sign of the output value of the comparator. Although this type of tracker has a large tracking range, simple design and low cost, However, the tracking accuracy is very low, it is susceptible to stray light interference, and the system stability is poor

[0004] Although some improved technologies have improved the tracking range and tracking accuracy of the sensor, they are still unsatisfactory due to reasons such as complex design and high cost.

Such as Chinese patent application 00219971.8 discloses a kind of sunlight tracking sensor, such as image 3 As shown, it consists of four-quadrant cells and intersecting light barriers. This design is simple in structure, but it is easily affected by stray light in terms of accuracy, the tracking accuracy is not enough, and the tracking system is not stable enough.

Chinese patent application 200510120837.0 discloses a solar tracking sensor, such as Figure 4 As shown, it consists of four photosensitive elements, a light-reducing plate, and a box with a middle partition. This design can only track in one direction of north-south (east-west), and other directions need to be installed separately. The installation is not easy enough, and the circuit design is not flexible enough.

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