本文關鍵詞：PIN二極管數(shù)控激勵電源設計及其應用　出處：《華中科技大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 有源頻率選擇表面 PIN 二極管 開關型穩(wěn)壓電路 恒壓恒流電路 反射率測量

【摘要】：有源頻率選擇表面(Active Frequency Selective Surfaces,AFSS)是微波領域的研究熱點之一。其主要對PIN二極管加以不同的激勵電流(或激勵電壓)以實現(xiàn)AFSS的不同吸波特性而備受關注。因而,開展對加載PIN二極管的激勵電源設計,研制出適用于AFSS微波反射率動態(tài)測量需求的數(shù)控恒壓恒流電源十分必要,該研究具有明確的應用背景和意義。首先對加載PIN二極管有源頻率選擇表面的激勵電源進行需求分析,根據(jù)PIN二極管在AFSS中的排列與驅動方式和應用環(huán)境的特殊性,給出激勵電源的綜合設計要求。由此從直流線性恒壓恒流電路、直流開關型穩(wěn)壓電路的工作原理分析和電路仿真出發(fā),討論具體電路的實現(xiàn)方式,從而為構建PIN二極管激勵電源奠定技術基礎。結合激勵電源有便攜、低功耗(高電源效率)和多通道實際應用要求,采用7串大容量動力鋰電作為供電電源,多子板插接方式實現(xiàn)多通道輸出。由基本串聯(lián)反饋穩(wěn)壓電路出發(fā),設計了高端電流檢測高端負載輸出低控制電壓高輸出電壓的穩(wěn)壓電路,結合開關型穩(wěn)壓電源的高電源效率與線性穩(wěn)壓的強紋波抑制、高控制精度,綜合設計出以開關穩(wěn)壓為前級,線性恒壓恒流電流為后級的直流恒壓恒流電路。最后,用STM32、16位DAC與24位ADC,設計出兩路數(shù)控恒壓恒流電路的子板,其最大輸出電壓為20 V,步進1 mV;最大輸出電流3 A,步進0.1 mA。同時設計了以STM32與4寸TFT制作的主控板與最多可插接四塊子板的底板。經(jīng)過硬件調(diào)試與電壓校準,該激勵電源進行了加載PIN二極管的AFSS微波反射率自動測量。結果表明,該電源能夠滿足微波可調(diào)諧吸波實際應用需求。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.4

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本文編號：1433445