电磁感应数字电源的设计与实现

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1、华北电力大学硕十学位论文摘要随着智能电网的建设，将会有越来越多的监控终端用来全面实时监控输配电设备的运行状态参数，对于安装在高压现场的监控终端需要电气安全隔离，可靠的电源供给是这些监测电子设备要解决的关键问题。本文针对以上情况研制了一种电磁感应数字电源，通过电磁感应的方式，利用电流互感器(CurrentTransfotruer,Cn从高压导线获取电能。本文选用磁饱和点高的取能铁芯，使取能铁芯在高压母线动态电流范围内始终工作在非饱和状态，并在取能线圈上引出多个抽头，采用数字电源的设计方法，通过采样后端的感应电压反馈调节电源CT的变比，设计的电源具有良好的自适应性，扩大了CT供电适

2、应母线电流的动态范围，有效解决了CT供电存在的电源热耗始终随母线电流增大而增大的问题。本文也对电源的电子电路进行了详细设计，使电源的输出电压可程控。结果表明，这种电磁感应数字电源在线路电流从10A到1000A的变化范围内，能为高压侧的电子设备提供约500mw的功率，输出电压达到了预期的设计效果，具有一定的实用价值。关键词：电磁感应；电流互感器；铁芯；单片机；高压侧电源华北电力大学硕士学位论文AbstractWiththedevelopmentofSmartGrid，therewillbemoreandmoreMonitoringTerminalusedtomonitorther

3、eal—timeoperationalstatusparametersoftransmissionanddistributionequipments．FortheMonitoringTerminalinstalledbythehigh-voltageside，electricalsafetyshouldtobeconsidered，andtherefiablepowersupplywasthekeyissuestobesolved．Forsolvingtiffsproblem，atypeofdi酉talpowersupplybasedonelectromagneticinduc

4、tionwasdevelopedinthispaper．ItusedtheCurrentTransformer(cotoobtainenergyfromthehigh-voltagecablebythewayofelectromagneticinduction．Byselectingahighmagneticsaturationpoint，theIron—COreofCTwasalwaysworkinginnon-saturationstatusduringthedynamiccurrentinhigh·voltagecable．TheCTratiowasregulatedac

5、cordingthesamplingvoltageofoutput—bythewayofelicitingseveraltapsfromthesecondarycoilofCT．Theadaptabilityofthedevelopedpowersupplytothedynamicrangeofhigh-voltagecablecurrentWasmorewidelythanthatoftheconventionalpowersupply．Theproblemofheatconsumptionincreasedwiththecurrentwhichexistinginnorma

6、lCTsupplywasalsoeffectivelysolved．Adetaileddesignofelectroniccircuitswasgiveninthispaper,andtheoutputvoltagecanbechangedbyprogrammerwhichavoidingchangingthehardware．Theresultsindicatedthatthepowersupplydesignedinthispapercouldoutputabout500mwforthehigh·voltagesideelectronicdeviceswhilethecab

7、lecurrentchangedfromIOAto1000A．Ithassomepracticalvalue．Keywords：Electromagneticinduction，CurrentTransformer,IronCore，Microcontroller,HighVoltageSidePowerSupplyⅡ华北f乜力大学硕十学位论文目录摘要．⋯⋯．．．．．⋯．．．．．⋯⋯．．⋯⋯．．⋯⋯．⋯⋯．⋯⋯．．．．⋯⋯．．．⋯．．⋯．．⋯⋯⋯⋯．．⋯⋯．．．．⋯．．．．⋯．．⋯．．．⋯．