The Study Of Controllable Constant Current Source For Solar Panels EL Test

Constant current source is the equipment for power conversion and power transmission, and it is the important guarantee of various electronic instruments. In recent years, small power and high power constant current source technology in research and practical applications are obtained fast development, intelligent and efficient constant current source is the inevitable trend of its development.With the continuous development of photovoltaic industry, solar cell board testing level requirements are also getting higher and higher. In order to meet the frequent startup of solar panels breakage detection device, combining with the existing technology, the research content is based on the "Solar panel EL test controllable constant current source". It introduces a new special solar panel EL test controllable constant current source in the light of the frequent start to solar panels breakage detection device. The main circuit of the constant current source use the single-terminal forward circuit, MCU generated PWM to control high power MOSFET, achieving60V,0～10A adjustable constant current output. The constant current source can provide over current and over voltage protection circuit, has a microcomputer interface, support the remote control, and has small volume, low cost. Through software simulation, proving this study is verified.The full text is divided into six chapters, the first chapter mainly elaborated the solar panel EL test that the background of the topic, and summarizes the application fields of constant current source and the development present situation, analyzes the significance of the study of solar panels EL test controlled constant current source. The second chapter is the design of the constant current source, the basic principle of main circuit topology including selection, single forward circuit and analysis of control mode of constant current source. The third chapter introduces the hardware system of the constant current source, including the main circuit design, control circuit design, the design of drive circuit, protection circuit design and control circuit design, and the parameters of each element in the main circuit is calculated in detail. The fourth chapter of the constant current source software were introduced, including the principle of PID algorithm, PWM programming, AD acquisition program design, constant flow between the source and the computer communication program design. The content of the fifth chapter is on the constant current source are simulated and concluded that the use of simulation software Proteus. The sixth chapter is the conclusion and prospect, summarizing the solar battery board EL test controllable constant current source design and the prospect of future development direction of constant current source.