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1、摘要曰.........曰................口.....门.............一门.....口.........口...口....曰...............口口...口.......口.口...曰...摘要逆变式点焊,是电子行业中无飞溅微型件焊接的主要方法。但是,现有的逆变式点焊机普遍存在电流波形的工艺性较差(无递增及递减)、工作稳定性差及功率较大等问题。因此,研制新型的小功率点焊逆变电源,有着重要的理论及工程应用价值。论文在研究国内外点焊逆变电源的基础上,提出了一种新型的交流斩波式变频电源,并详细分析了工频交流斩波后的电压波形。通过快速离散
2、傅立叶变换分析,得出了占空比、斩波频率与二次谐波幅值之间的关系,提出了占空比及斩波频率的合理取值范围。在上述理论基础上设计并实现了逆变电源的主电路及其控制系统。并针对斩波电路中工频分量对焊接变压器正常工作的影响进行了分析,通过试验选取合适的串联电容,有效的降低了变压器两端的工频电压及空载电流。本文设计的主电路及控制系统软、硬件均己通过调试。整机运行测试结果表明,系统的控制功能已达到设计要求,主电路及焊接变压器工作正常,输出的斩波波形与理论波形基本相同。本文研制成功的工频交流斩波式变频点焊电源,对于从根本上提高精密微型件的点焊质量有重要意义。关键词:交流斩波变频点焊电源
3、AbstractAbstractinverterspotweldingisthenon-splashmicroelementsweldingtechniqueintheelectronicindustry.However,thereareseveralcommonproblemsexistinginthecurrentinverterspotweldingmachine,whichareunidealcurrentwave,unsatisfiedworkstabilityandrelativelybigpowerconsumption,etc.Therefore,re
4、searchanddevelopmentofanew-stylelowpowerinverterspotweldingpowersourcehassignificanttheoriesandtheengineeringapplicationvalues.Onthebasisofresearchthedomesticandinternationalinverterpowersource,thisdissertationstatesanew-styleinverterspotweldingpowersource,andatthesametime,itdetailedana
5、lyzethechoppedACvoltagewave.ThroughtheanalysesofFastFourierTransform,therelationshipsamongtheoccupationprobability,chopfrequencyandtheamplitudeofsecondharmonicshavebeengoten,andthereasonablevaluescopehavebeengivenhere.Onthetheoriesfoundationstatedabove,maincircuitofinverterpowersourcean
6、dthecontrolsystemhavebeendesignedandactualized.Efectofpowersupplyfrequencytotheweldingtransformerinthemaincircuithasbeenanalyzed,and,throughlabtesting,appropriateseriescapacitancehasbeenselected,whicheffectivelyreducepowervoltageandno-loadcurrentofthetransformer.Themaincircuit,softwarea
7、ndhardwareofthecontrolsystem,statedinthispaper,allhavepassedthedebug.Ithasbeenindicatedinthewholenamingtestresultthatthecontrolfunctionofsystemhasreachedthedesignrequest,maincircuitandtransformerareworknormally,andthechopped-waveisconcordancewiththetheory.Thesuccessfuldesignofa