適用于高精度BUCK變換器的驅(qū)動及保護電路研究與設(shè)計
[Abstract]:With the rapid development of modern electronic technology, the functions of portable electronic devices are more diversified and mature. Especially, the advantages of portable electronic devices make electronic products become an indispensable part of people's life. As an important part of electronic products, power supply is more and more critical to the performance of power management. Among all kinds of power management methods, switching power supply has the highest conversion efficiency (more than 90%), which can effectively avoid the waste of energy and conform to the current international situation and development trend of energy saving and emission reduction. Switching power supply technology also has the advantages of high reliability, light weight, high speed, strong anti-jamming ability and so on. Switching power supply has been widely used in various fields of electronic products. The research and development of switching power supply has been a very popular direction in order to meet different performance indexes and a variety of new electronic equipment. In the switching power supply, the design of power transistor and its driving circuit plays a decisive role in improving the overall conversion efficiency of the chip, and the protection circuits such as soft start circuit, over-temperature protection and under-voltage overvoltage are used to ensure that the system works in a safe environment. In order to improve the overall reliability of the chip is essential. Therefore, it is necessary to study and improve them, and it is also very important to improve the overall performance of switching power supply. In this paper, the basic theoretical knowledge of DC-DC switching power supply and the current main methods of switching power supply are described. The main modules of switching power supply are analyzed in theory and principle, and the advantages and disadvantages of these methods are analyzed. After comprehensive analysis, the DCDC converter with constant on-time control is designed, and the related theories of driving circuit and protection circuit are analyzed in detail. The possible problems in the design of driving module are analyzed, such as the dead zone setting problem, the problem of preventing penetration through protection and so on. Thirdly, the design and simulation of the soft start module, the driving module, the output abnormal protection module and the over-temperature protection circuit are carried out. The function of the module meets the requirements of the general architecture planning, the performance is stable, and the logic control can meet the requirements of the system. Finally, based on 0.35 渭 m BCD process, the overall stability and reliability of the system are simulated by Spectre simulation software under Cadence. It can be seen from the simulation results that the BUCK converter with the input voltage of 4.5 ~ 28V and the lowest output voltage of 0.8V has the advantages of fast response speed, high precision and high system stability.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TM46
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