| In order to solve the issue of the MAV and other small automated machines less working time and poor battery life, the design of laser wireless power transmission system and improving its performance have been studied in this paper. By dividing laser wireless power transmission system into four parts, the selection of laser type, the collimated and expanded module of laser beam, the principle of an optical-to-electrical conversion efficiency of a single junction Ga As photovoltaic cell for the high intensity laser with different wavelengths and intensities, the selection of DC boost chip and design of its peripheral circuit have been researched. Through the method of combining theoretical calculations and experimental measurements, the energy conversion efficiency of each module has been optimized to achieve laser wireless power transmission system operating efficiently.Firstly, the purpose and significance of the project on laser wireless power transmission system have been expounded. According to the project requirements, this part has been mainly focused on the characteristics of laser wireless power transmission technology, key components, and the research status at home and abroad. Based on the analysis of the system structure and performance characteristics of the laser wireless power transmission system, the system has been decomposed into four parts, including laser module, beam shaping module, photovoltaic module and boost and power storage module.Secondly, through analysing the various factors that affect the laser wireless power transmission, which are recognized as the theoretical basis for selection of laser module, its working principle, basic structure and output characteristics have been introduced. According to the transmission characteristics of gaussian beam and the laser output parameters, by ZEMAX simulation method, a set of aspheric lens group has been designed as the beam shaping module of the system. Through comparing parameters of common photocells, such as the basic structure, working principle and photoelectric conversion efficiency, high efficiency Ga As photocell has been chosen as the photoelectric conversion module of the system. An optical-to-electrical conversion efficiency of high efficiency Ga As photocell with different wavelengths and intensities of laser has also been measured experimentally and explained theoretically. By choosing the appropriate booster chip and optimizing the peripheral circuit, boost and power storage module of the system has realized the efficient storage of photocell’s output power.In addition, this subject innovatively has used the method which makes the wavelength and intensity of laser matching photovoltaic cell band gaps. It has made single junction Ga As cell conversion efficiency greatly improved, which has been experimentally measured and can up to 61.2%. Therefore, this research results may be utilized to steer the application of laser wireless power transmission. |
PDF Full Text Request