High-precision Thermostat Bath Design Used For The Production Of Solar Panels

For the strenuous energy sources currently in the global scope, the application of solar energy is paid more attention by many countries all the word than before. Photovoltaic (PV) generation, one method of using solar energy, is very promising, photovoltaic solar panel requires production of PN junction. It is requested temperature of diffuse gas at 20℃(±0.1℃) during semiconductor PN junction production process. This design is the thermostat bath used to ensure constant temperature of gas diffusion during the production of semiconductor PN junction.The paper introduces hardware structure of the thermostat bath control system, including touch screen, PLC, semiconductor refrigerators, electric pipe, thermocouples , signal conditioning circuit and so on. Fuzzy-PID controller of the constant temperature control system was designed. Fuzzy-PID control meets control precision requirement of time-varying systems in high-precision control field, temperature accuracy of system was to enhance.The multi-sensor information fusion technology was used in control system in order to improve the sensor accuracy. Division estimation was applied to the measured data from every single sensor, the value of local decision-making was obtained;further processing based on relative distance was applied to the data whose covariance overruns some value, which has been pre-supposed by man; the adaptive weighted fusion algorithm was applied to all the values of local decision-making according to the optimal weight distribution principle. The analysis shows that the fusion result of this method is closer to the true data than that of the traditional one.The different tactics are applied in the thermostat bath system. The experiment data shows the temperature accuracy is less than±0.1℃, which proves the rationality and the validity of the fuzzy-PID control arithmetic and the thermostat bath control system design.