資源描述:
《實用開關電源分析與設計ppt課件.ppt》由會員上傳分享,免費在線閱讀,更多相關內(nèi)容在教育資源-天天文庫。
1、實用開關電源分析與設計主要內(nèi)容1.開關電源設計規(guī)格書和技術指標;2.常用的基本拓撲簡介及適用的領域和功率等級;3.小功率輔助電源和電源適配器設計;4.臺式機電源及無外殼內(nèi)置式電源設計;5.傳統(tǒng)服務器一次電源設計;6.原理圖設計及PCB布局和布線。開關電源設計規(guī)格書和技術指標(Specification)電氣規(guī)范(Electricalspecification)機械規(guī)范(Mechanicalspecification)噪音要求(Acousticrequirements)兼容性(Regulatorycompliance)可靠性和測試計劃(Reliabilityrequir
2、ementandtestplan)開關電源設計規(guī)格書和技術指標(Specification)電氣規(guī)范(Electricalspecification)輸入(Inputrequirement)1.輸入電壓:2.輸入過流保護:fuse3.交流浪涌電流:I2t4.漏電流:<3.5mA5.電壓浪涌和holduptime:300Vrmsfor100ms;>20ms6.AClinebrownout:<80Vrmsshutdown7.效率和能源之星(EnergyStar)8.功率因數(shù):>90%@50%load,>95%@100%load電氣規(guī)范(Electricalspecific
3、ation)輸出(Outputrepuirements)電壓容差(Voltagetolerance):電流和功率:3.動態(tài)負載響應(dynamic):Turnonovershoot:<10%負載變化(loadvariation):10Hz-10KHz,duty:10%-90%容性負載:1000uF-8000uF4.輸出紋波和噪音(rippleandnoise):120mVpp5.閉環(huán)穩(wěn)定性:Phasemargin>50°;Gainmargin>10dB開關電源設計規(guī)格書和技術指標(Specification)電氣規(guī)范(Electricalspecification)開
4、關電源設計規(guī)格書和技術指標(Specification)保護(Circuitprotection)1.OverVoltageProtection(OVP)TheOVPshallbelatchmode.Thereshallbenomis-triggeroftheOVPundernormaloperation.RecycletheACsourceisrequiredtoresetthePSafterOVP.2.Shortcircuitprotection(SCP)輸出短路電阻小于0.1Ω,PSshutdownandlatchoff.3.Overcurrentprotect
5、ion(OCP)OCP觸發(fā)點在30A~38A之間。4.Overtemperatureprotection(OTP)啟動和上電順序(Startupandpowersequencing)接地方式(Grounding)控制信號(Controlsignals)開關電源設計規(guī)格書和技術指標(Specification)電氣規(guī)范(Electricalspecification)機械規(guī)范(Mechanicalspecification)開關電源設計規(guī)格書和技術指標(Specification)冷卻(Cooling)風速(Airflow)器件溫度和風扇控制熱保護治具和連接(Harne
6、ssandconnector,wires)外形、尺寸和重量開關電源設計規(guī)格書和技術指標(Specification)SafetyCertificationsEMCRequirementsEnvironmentalRegulatoryCompliance可靠性和測試計劃(Reliabilityrequirementandtestplan)噪音要求(Acousticrequirements)兼容性(Regulatorycompliance)常用的基本拓撲簡介及適用的領域和功率等級功率因數(shù)校正電路(PFC)臨界連續(xù)模式PFC電路(TMorCRM)連續(xù)導電模式PFC電路(CC
7、M)直流變換電路(DC/DC)反激變換器(Flyback)正激變換器(Forward)LLC半橋諧振變換器(LLCHB)移相全橋變換器(PSFB)功率因數(shù)校正電路(PFC)臨界連續(xù)模式PFC電路(TMorCRM)連續(xù)導電模式PFC電路(CCM)KeepTonateveryswitchingcycle,thenIin(t)willfollowwithVin(t).---TMPFCrealizedOperationtheoriesofNCP1605controlPFC---DCM+CRMDCMPFCforlimitingmaximumswitchingf