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1、本科毕业设计(20届)音频功率放大器设计摘要电子信息技术几乎主宰了整个电器行业的发展,随着电子技术的进步发展在功率放大器的设计上功能也不断更新。功率放大器在家电、数码产品中的应用也越来越广泛,与我们日常生活有着密切关系。随着生活水平的提高,人们越来越注重视觉,音质的享受。在大多数情况下,增强系统性能,如更好的声音效果,是促使消费者购买产品的一个重要因素。音频功率放大器作为音响等电子设备的后级放大电路,它的主要作用是将前级的音频信号进行功率放大以推动负载工作,获得良好的声音效果。同时音频功率放大器又是音响等电声设备消耗电源能量的主要部分。音频
2、功率放大器构成有前置放大器,功率放大器,扬声器,整流电源等。前置放大器用微处理器LM324来设计,功率放大器是主体部分,我用TD2030A来实现功能,电源部分要做到输出功能强却不简单,即噪声小。制作的音频功率放大器的主要功能为把外接音频小功率放大,最后扬声器输出。关键词:微处理器LM324;音频功率放大器;TD2030;放大电路AbstractElectronicinformationtechnologyisalmostdominatedtheentireelectricalindustry,withtheprogressanddevelo
3、pmentofelectronictechnologyinthedesignofpoweramplifierfeaturesareconstantlyupdated.Poweramplifiersinhomeappliances,digitalproductsareincreasinglybeingusedinapplications,andiscloselyrelatedtoourdailylife.Withtheimprovementoflivingstandards,thereisgrowingemphasisonvisualands
4、oundqualitytoenjoy.Inmostcases,enhancedsystemperformance,suchasbettersoundeffects,istopromoteconsumerstobuyproducts,animportantfactor.Stereoaudiopoweramplifierandotherelectronicequipmentasapost-stageamplifiercircuit,itsmainroleistoleveltheaudiosignalbeforethepoweramplifier
5、inordertopromotetheworkload,getagoodsound.Stereoaudiopoweramplifierisalsoelectro-acousticdevicessuchasthemainpartoftheenergyconsumptionofpower.Currently,analogaudiopoweramplifierisstillthemainstreamproducts,analogamplifierhasexperienceddecadesofcontinuousimprovementandperf
6、ection,anditstechnologyhasbeendevelopedtoitspeak.Analogclass-basedpoweramplifierisalinearamplifier,poweramplifierpartsaretwotypesoftubesandtransistors.BypoweramplifierquiescentpointofthesetcanbedividedintoClassAamplification,A/BClassandCClasszoommagnificationofthree.Thebig
7、gestadvantageofthetransistoramplifierisapowerconversionefficiency(Cclasspoweramplifierupto55%),smallsize,lightweight,lessheat,lowproductioncosts.Thedisadvantageisthelowconversionrate,evenhigherharmonicdistortion.Withthecontinuousimprovementoftransistormanufacturingtechnolo
8、gyandnewtechnology,theavailabilityandreliabilitytargetshavegreatlyimproved,andcontinuetot