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1、（20__届）本科毕业设计大功率电镀电源的设计----控制和保护电路设计43摘要本文在分析了电镀电源的发展历程和研究现状后，结合开关电源的基本原理，设计了输出容量为0~30V，最大电流为500A的电镀开关电源。传统的开关电源采用的是可控硅整流，其体积和重量大，纹波大，稳定性不高，效率低，电源效率一般约为70%；单台电源不能长期无故障工作，无冗余系统来保证稳定性。而采用高频软开关电源能够极大的提升电源的性能。本文中选择了桥式推挽电路作为主电路的拓扑。控制电路以TL494为核心产生PWM脉冲控制信号。TL494的2脚接受的控制信号
2、，输出对应宽频的PWM信号；1脚接受从采样电阻返回的反馈电压信号，对PWM信号进行调整，以达到稳定输出电压的目的。最后给出结论，参与研制的高频开关电镀电源达到了预期的技术指标，为提高电源性能所做的工作达到了预期要求。关键词：电镀,软开关,桥式推挽电路43Thedesignofhighpowerelectroplatingpower,controlandprotectionofcircuitdesignABSTRACTFirstly,analyzingthedevelopmentofelectroplatingpowerandt
3、herecentfindings.Then,usingthebasicprinciplesoftheswitchpower,asoftswitchplatingpowercanbedesignedwithoutputvoltagesfrom0to50Vandthemaximumcurrent500A.ThetraditionalDCpower-supplyusingsilicon-controlledrectifieriswithbigbulkandweight,highripplecoefficientofoutputvol
4、tage,lowstabilityandefficiency,besides,theefficiencyfallsto70％aroundandsingepowerishardtokeepworkingforalongtimewithoutredundancysystem.However,highfrequencysoftswitchpowercangreatlyimprovetheperformance.Inthispaper,bridgepush-pullcircuitisusedasthetopologyofmaincir
5、cuit.TL494ischosentobethecoreofthecontrolcircuittoproducePWMpulsesignal.TheNo.②pinofTL494chipreceivesthecontrolsignalandoutputsthecorrespondwide-frequencyofPWMsignal.TheNo.①pinacceptsthefeedbackvoltagesignalsofsampleresistance,thenthePWMsignalgetsadjustedtoachieveth
6、epurposethatkeepingoutputvoltagesteady.Finally,theconclusionisthedevelopmentofhigh-frequencyswitchingpowersupplyplatinghadmetthetechnicalspecifications.Theworkwehavedoneinordertoimprovethepowerperformanceachievesthedesiredrequirements.KEYWORDS:plating,softswitching,
7、bridgepush-pullcircuitits43目录摘要..............................................................ⅣABSTRACT...........................................................Ⅴ1绪论............................................................11.1本课题研究的背景.............................
8、...............11.2电镀电源的发展历史..........................................11.3我国电源产业的三个阶段......................................21.4电镀电源的发展趋势..
