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1、摘要随着电力电子技术的高速发展，电力电子设备与人们的工作、学习和生活的关系日益密切，而此类设备都离不开可靠的电源。开关电源是近年来应用非常广泛的一种新式电源，它具有体积小、重量轻、效率高、发热量低、使用方便、性能稳定等优点，而且已逐渐取代传统线性电源。在邮电通信、航空航天、仪器仪表、工业设备、医疗器械、家用电器等领域应用效果显著，进一步促进了开关电源技术的迅速发展。目前，开关电源正朝着集成化、智能化、模块化的方向发展。本文简述了一个60W反激式开关电源的设计过程。该电源通过将输入的交流电压经过滤波、PWM控制、功率变换和稳压控制等电路的处理，得到一个60W的直流
2、输出。该电源具有短路保护、过流保护、反馈补偿等保护电路，增强了电源工作的安全性和可靠性。其中PWM控制模块最为关键，它主要通过控制脉冲电压的占空比来控制反激变压器的开通与关断，从而得到所需输出电压的目的。整个电源采用最新的电路设计，具有结构紧凑、性能可靠、输入电压范围宽、输出效率高等优点。关键词：开关电源；PWM控制；功率变换；反激变换；保护电路AbstractWiththerapiddevelopmentofpowerelectronictechnology,thepowerelectronicequipmentsandpeople'swork,studyan
3、dlifemoveeverclosertogether,andthesedevicesareinseparablefromreliablepowersupply.Theswitchingpowersupplywhichiswidelyappliedinrecentyearsisanewpowersupply,ithasadvantageslikesmallvolume,lightweight,highefficiency,lowcalorificvalue,convenientusage,stableperformance,andhasadvantagesofs
4、ubstitutingthetraditionallinearpower.Atpostandtelecommunications,aerospace,instruments,industrialequipment,medicalequipment,householdappliances,etcapplicationeffectofswitchingpowersupplyissignificantly,andithaspromotedtherapiddevelopmentofswithingpowersupply.Atpresent,switchingpowers
5、upplyisimprovingtowardtointegration,intelligentandmodulardirection.Thispaperintroducesa60Wflybacktypeswitchpowersupplydesignprocess.Itinputacvoltage，withfiltering,PWMcontrol,powertransformationandthevoltagecontrolcircuit,thenoutputdc60W.Thispowerwithshortcircuitprotection,overcurrent
6、protection,feedbackcompensationprotectioncircuit,strengthenedthepowerworksafetyandreliability.Amongthem,themostkeyisPWMcontrolmodule,whichismainlyachievedbycontrolingthedutycycleofpulsevoltagetocontroltransformeropenandshutoff,andit’srequiredforthepurposeoftheoutputvoltage.Thepowerso
7、urceadoptsthelatestcircuitdesign,withcompactstructure,reliableperformance,wideinputvoltagerange,higherefficiency.Keywords:switchingpowersupply;PWMcontrol;powerconverter;flybacktransform;protectioncircuit目录引言1设计任务31开关电源基本知识31.1基本的PWM变换器主电路拓扑31.1.1Buck变换器31.1.2Boost变换器31.1.3Buck-Boost变
8、换器41.1.4Cuk变
