PIN二极管数控激励电源设计及其应用

发布时间：2018-01-16 14:12

本文关键词：PIN二极管数控激励电源设计及其应用　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：有源频率选择表面(Active Frequency Selective Surfaces,AFSS)是微波领域的研究热点之一。其主要对PIN二极管加以不同的激励电流(或激励电压)以实现AFSS的不同吸波特性而备受关注。因而,开展对加载PIN二极管的激励电源设计,研制出适用于AFSS微波反射率动态测量需求的数控恒压恒流电源十分必要,该研究具有明确的应用背景和意义。首先对加载PIN二极管有源频率选择表面的激励电源进行需求分析,根据PIN二极管在AFSS中的排列与驱动方式和应用环境的特殊性,给出激励电源的综合设计要求。由此从直流线性恒压恒流电路、直流开关型稳压电路的工作原理分析和电路仿真出发,讨论具体电路的实现方式,从而为构建PIN二极管激励电源奠定技术基础。结合激励电源有便携、低功耗(高电源效率)和多通道实际应用要求,采用7串大容量动力锂电作为供电电源,多子板插接方式实现多通道输出。由基本串联反馈稳压电路出发,设计了高端电流检测高端负载输出低控制电压高输出电压的稳压电路,结合开关型稳压电源的高电源效率与线性稳压的强纹波抑制、高控制精度,综合设计出以开关稳压为前级,线性恒压恒流电流为后级的直流恒压恒流电路。最后,用STM32、16位DAC与24位ADC,设计出两路数控恒压恒流电路的子板,其最大输出电压为20 V,步进1 mV;最大输出电流3 A,步进0.1 mA。同时设计了以STM32与4寸TFT制作的主控板与最多可插接四块子板的底板。经过硬件调试与电压校准,该激励电源进行了加载PIN二极管的AFSS微波反射率自动测量。结果表明,该电源能够满足微波可调谐吸波实际应用需求。
[Abstract]:Active Frequency Selective Surfaces. AFSS is one of the research hotspots in the field of microwave. It is paid more attention to apply different excitation current (or excitation voltage) to PIN diode to realize the different absorbing characteristics of AFSS. It is necessary to develop a constant voltage and constant current power supply suitable for the dynamic measurement of microwave reflectivity of PIN diode. This research has a clear application background and significance. Firstly, the demand of the exciting power supply loaded with PIN diode active frequency selective surface is analyzed. According to the arrangement and driving mode of PIN diodes in AFSS and the particularity of the application environment, the comprehensive design requirements of the excitation power supply are given, and the DC linear constant voltage constant current circuit is obtained. The working principle analysis and circuit simulation of DC switching voltage stabilizer circuit are discussed, and the realization mode of specific circuit is discussed, so as to lay a technical foundation for the construction of PIN diode excitation power supply, which is portable in combination with the exciting power supply. Low power consumption (high power efficiency) and multi-channel practical application requirements, 7 series of large capacity power lithium power supply is used as the power supply, multi-subboard plug mode to achieve multi-channel output, starting from the basic series feedback voltage stabilizing circuit. The high end current detection circuit of high end load output low control voltage and high output voltage is designed, which combines the high power efficiency of switching voltage stabilized power supply and the strong ripple suppression of linear stable voltage, and has high control precision. A DC constant voltage constant-current circuit with switching voltage as the front stage and linear constant voltage and constant current as the rear stage is designed. Finally, STM32N 16-bit DAC and 24-bit ADC are used. A subboard of two NC constant voltage and constant current circuits is designed. The maximum output voltage is 20 V and the step is 1 MV. The maximum output current is 3A, step 0.1 Ma. At the same time, the main control board made of STM32 and 4-inch TFT and the base board with up to four subboards can be plugged in. The hardware is adjusted and the voltage is calibrated. The microwave reflectivity of the PIN diode loaded with this exciting power supply is measured automatically. The results show that the power supply can meet the practical requirements of microwave tunable absorbing.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.4

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