全橋移相PWM開(kāi)關(guān)電源的數(shù)字化控制方案精

45920239月電力電子技術(shù)Vol.45,No.9September2023PowerElectronics2主電路圖:2023-05-16:(1978-,,,,1近年來(lái),隨著數(shù)字技術(shù)的不斷進(jìn)展,數(shù)字掌握PWMDC/DC非線性不易補(bǔ)償?shù)热秉c(diǎn),[1]PWM,20kHzPWM,Pspice,仿真和試驗(yàn)結(jié)果,2PWMDSP實(shí)現(xiàn)方案DSP為核心的DSP數(shù)字掌握IGBT1所2.1主電路的設(shè)計(jì)2[2]Udc220V單相溝通電源經(jīng)整流濾波后的輸出直流電壓,VT1~VT4脈沖,,在次級(jí)線圈感應(yīng)出交變的方波脈沖,LC,得到所需的恒定直流電逆變電路承受單相全橋逆變器構(gòu)造,4個(gè)功IGBTDSP掌握回路作用下作周期性的開(kāi)關(guān)動(dòng)作,將直流電壓逆20kHzPWM方式保持開(kāi)關(guān)頻率不變,PWM開(kāi)關(guān)電源的數(shù)字化掌握方案石雄偉(江陰職業(yè)技術(shù)學(xué)院電子信息工程系,214433:PWMDSP實(shí)現(xiàn)方案框圖對(duì)其主電路和掌握電路的硬件電路及參數(shù)估算進(jìn)展了具體設(shè)計(jì)并對(duì)其數(shù)字掌握系統(tǒng)的軟件設(shè)計(jì)方法進(jìn)展了爭(zhēng)論全面介紹了一種PWM開(kāi)關(guān)電源的數(shù)字化掌握方案。經(jīng)軟件仿真和試驗(yàn)驗(yàn)證,通過(guò)DSP實(shí)現(xiàn)數(shù)字掌握,,說(shuō)明該數(shù):開(kāi)關(guān)電源;數(shù)字掌握;:TN86:A:1000-100X(202309-0108-03TheDigitalControlSchemeofFull-bridgePhase-shiftedPWMSwitchingPowerSupplySHIHong-wei(JiangyinPolytechnicCollege,Jiangyin214433,ChinaAbstract:Thegeneralblockdiagramisproposedfirstly,thenthemaincircuitandcontrolcircuitoffull-bridgephase-shiftedPWMswitchingpowersupplyaredesigned,andthesoftwaredesignmethodofdigitalcontrolsystemisintro-duced.FinallythedesignedsystemissimulatedwiththePspicesimulationsoftware.Thesimulationresultsshowthatthecontroleffectissatisfactorywheninputvoltagechangesinawiderangeandthedigitalcontrolschemeisfeasible.Keywords:switchingpowersupply;digitalcontrol;full-bridgephase-shifted1總體構(gòu)造框圖108圖4DSP的移相原理圖24V的恒壓輸設(shè)計(jì)要求:Po=3kWUo=24V則額定輸出電Ip=Po/Uo=125A,初級(jí)電流I=5A,IGBT5A550V據(jù)APT13GP120BIGBT2200pF的電500V加至高頻變壓器初級(jí)在變壓器作用下次級(jí)電壓20V251。電壓,LC路的工作頻率很高2.2掌握電路的設(shè)計(jì)[3]DSP芯片TMS320LF2407A內(nèi)置兩個(gè)EVA,EVB,40MIPS,DSP,4Uo檢測(cè),Uo,減小移相角,使UoUo上升時(shí)增加移相角,使逆變器輸出電壓方波減小,Uo下降到穩(wěn)定值,,,A/D轉(zhuǎn)換后得到DSP,然后與給定量進(jìn)展比較,PI運(yùn)算,源的占空比信號(hào),DSPPWM信號(hào)發(fā)生電路發(fā)送信號(hào),PWM信號(hào)發(fā)生器經(jīng)過(guò)IGBTPWM信號(hào),從而掌握開(kāi)[4],3,可使主電路DSP,為保障電源安全牢靠工作,此A/D一旦超過(guò)給定值,必需在短時(shí)間內(nèi)切斷主電路并引發(fā)中斷輸出引腳置為高阻態(tài)封鎖驅(qū)動(dòng)信號(hào),關(guān)閉功率器件,驅(qū)動(dòng)電路是掌握電路與主電路的接口,IGBT專用集成驅(qū)動(dòng)芯片EXB841,4IGBT3系統(tǒng)軟件設(shè)計(jì)DSP數(shù)字掌握能實(shí)現(xiàn)比模擬掌握更為高級(jí)且能消退因離散元件引起的不穩(wěn)定和電磁干擾,,3.1DSP移相掌握原理4[5]1的周期存放器T1PR給定,計(jì)數(shù)存放T1CNT/VT1,VT2為固定臂開(kāi)關(guān)管,VT3,VT4DSPuPWM1和uPWM2,死區(qū)時(shí)間由死區(qū)掌握存放器給出,VT3,VT4的移相角由CMPR2給定,DSPuPWM3,uPWM4CMPR2uPWM3uPWM4互補(bǔ)uPWM1uPWM4,uPWM2uPWM3同時(shí)為高時(shí),3.2PID算法PID掌握器來(lái)實(shí)現(xiàn)電壓和電流的動(dòng)態(tài)穩(wěn)定,PID掌握規(guī)律可表示為:u(t=KPe(t+1TIe(tdt+TDde(tdttt(1式中:u(tPID調(diào)整器輸出量;TI為調(diào)整器的積分時(shí)間TD為調(diào)整器的微分時(shí)間KP圖3DSP掌握電路構(gòu)造PWM10945920239月電力電子技術(shù)Vol.45,No.9September2023PowerElectronics724V直流輸出電壓試驗(yàn)波形對(duì)式(1離散化得:ui=KPei+TTIij=0Σej+TT(ei-ei-1ΣΣ(2:ui-1=KPei-1+TIi-1j=0Σej+TP(ei-1-ei-2ΣΣ(3由式(2,(3得:ui=ui-1+KP(ei-ei-1+KIei+KD(ei-2ei-1+ei-2(4式中:KI為積分系數(shù),KI=KPT/TI;KD為微分系數(shù),KD=KPTD/T。3.3數(shù)字濾波DSP,加強(qiáng)其有用信號(hào),消退PID調(diào)整前應(yīng)首先,對(duì)目標(biāo)參數(shù)進(jìn)展連續(xù)采樣,然后3.4軟件實(shí)現(xiàn)3局部,5,,在等待中斷的空閑時(shí)間內(nèi)采集輸出信號(hào)ADC1,PWM信號(hào)的頻率和死區(qū)時(shí)間,設(shè)置通用定時(shí)器1和2的掌握存放器系統(tǒng)仿真Pspice9.23kW/20kHz(125A/24V電壓的大小,:Ui=500VUo=24V;N=25;Lr=20μH;VT1~VT4APT13GP120B;VD5,VD6DD200KB。6a,由于兩橋臂驅(qū)動(dòng)uabip→→→→→→緩慢下→反向→→…6b示出整流濾波輸出電壓波形可見(jiàn)紋波也不太試驗(yàn)結(jié)果及分析3kW/20kHz(125A/24V輸出電壓電流均:220V/50Hz,3kW,20kHz,圖7,,輸出波形良好,結(jié)合當(dāng)前高頻開(kāi)關(guān)電源的進(jìn)呈現(xiàn)狀,PWM開(kāi)關(guān)電源的數(shù)字化掌握方案,根3kW/50kHz高頻數(shù)字開(kāi)關(guān)電源,DSP的掌握電路設(shè)計(jì)方案最終驗(yàn)證了參考文獻(xiàn)張占松開(kāi)關(guān)電源的原理與設(shè)計(jì)([M].北京:電子工業(yè)出版社,2023..[M].北京:機(jī)械