The Testing System Of Solar Cell Based On Bluetooth Transmission

Due to the solar industry’s rapid development, the demand for solar cell testingsystems is growing fast and the functional requirements of test systems are becomingincreasingly diverse. This thesis design a low cost, portable solar test system, the concept ofusing Bluetooth technology in solar cell testing system was proposed, which makes thetesting system have a good convenience and scalability.The system uses FPGA as main control chip and the capacitor charging process is usedto simulate load’s change, meanwhile, battery voltage and current signals are collected bysample circuit, temperature and light intensity signals are acquired by digital sensors,ultimately, they are transmitted to the test terminal by Bluetooth short-range wirelesstransmission. Human-computer interaction program is built by LabVIEW, which completethe standardization of field test data, the I-V curve fitting and the display of final testresults.The system could be divided into four main parts, the front-end circuit, FPGA module,Bluetooth module and human-computer interaction programm. Front-end circuit isresponsible for the acquisition of the voltage and current analog signal and analog to digitalconversion; FPGA is the master controll of the system, including the sampling circuitcontrol module, storage module and UART module; Bluetooth, which uses the UART serialport to communicate with the FPGA, is responsible for the wireless transmission of data;human-computer interaction program is final display interface of the system, in charge ofcontroling the entire testing system’s inputs and test data graphical displaying.Test results of a sample battery show: the system completed a test of main parametersof the sample battery, including open-circuit voltage, short-circuit current, maximum powerpoint, fill factor, etc. it has practical value for engineering application with good stabilityand accuracy.