基于超級(jí)電容器的新型供電系統(tǒng)技術(shù)研究
[Abstract]:The traditional wired power supply and communication mode of flexible vision sensor has some inevitable defects, such as cable bundle is easy to break, teaching posture is sometimes difficult to achieve, and so on. A new type of power supply system based on supercapacitor is studied in this paper, which provides a wireless power supply solution for flexible vision sensor, and makes it more convenient and flexible in industrial field measurement application. Supercapacitors, developed from the 1970s and 1980s, are electrochemical components that store energy through polarized electrolytes. Unlike the traditional chemical power supply, its energy storage and discharge process is a physical process and reversible, so it has many advantages, such as high current, rapid charge and discharge, no memory effect, very low internal resistance. High energy and power density, long cycle life, environmental protection, etc. Because of these outstanding advantages of super capacitor, it has a wide application prospect in electric vehicles, high power pulse power supply and other fields. In this paper, a new type of power supply system is designed based on the super capacitor as the only energy storage element. The system consists of charging system and DC-DC voltage stabilizing system. Under the control of Freescale single chip computer, the charging device realizes the combination of constant current charging and constant voltage charging, which greatly shortens the time of charging. Constant-current charging is a charging mode in which the charge current is maintained at a constant value, which is used in the early stages of charging to speed up the charging, but if the constant current charging mode is maintained all the time, Until the voltage at both ends of the super capacitor reaches the rated voltage value, the voltage at both ends of the capacitor will drop sharply below a certain voltage value of the rated voltage at the moment of power off because of the internal resistance of the super capacitor and the effect of charge accumulation. At the end of charging, we switch charging mode to constant voltage charge to ensure full capacity. In this paper, the charging method is described in detail, and the corresponding simulation and experiment are done. In the DC-DC voltage stabilizing circuit, the output voltage of the supercapacitor is converted into several groups of constant voltage values, which are 12V, 5V, 5V, Vadj, which are output through the terminal. The function of using super capacitor to supply power to the sensor circuit board is realized by connecting different power supply parts of the sensor. The experimental results show that the charging part of the system can fill the super capacitor in a few minutes, and the charging speed is much faster than that of the ordinary lithium battery. The DC voltage stabilizer of DC-DC can provide the DC voltage of ultra small ripple rate, which can meet the requirements of the backend sensor for power supply. In a word, the power supply system designed in this paper can be used as a substitute for traditional batteries in some fast charging systems.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM53;TM724;TM910.6
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