Fais fab mov - Lub reflected voltage ntawm flyback fais fab mov muaj lwm yam kev txiav txim
Lub reflected voltage ntawm flyback fais fab mov kuj muaj feem xyuam rau ib qho parameter, uas yog, cov zis voltage. Qhov qis dua qhov tso zis hluav taws xob, qhov loj dua qhov hloov pauv hloov pauv, qhov loj dua qhov hloov pauv hloov pauv inductance, thiab siab dua lub raj hloov hluav taws xob tiv taus qhov hluav taws xob, uas yuav ua rau lub raj hloov pauv thiab nqus tau ntau dua lub zog siv hluav taws xob, qhov tsis ua haujlwm tas mus li. ntawm cov khoom siv hluav taws xob snubber tuaj yeem tshwm sim (tshwj xeeb tshaj yog lub voj voog siv lub sijhawm hloov hluav taws xob hluav taws xob hluav taws xob). Kev saib xyuas yuav tsum tau ua nyob rau hauv cov txheej txheem optimization ntawm kev tsim ib tug tsawg-voltage tso zis low-power flyback fais fab mov. Muaj ntau txoj hauv kev los daws nws:
1. Siv cov tub ntxhais sib nqus nrog lub zog siab dua kom txo qis inductance, uas tuaj yeem txhim kho kev hloov pauv ntawm cov hluav taws xob tsawg-voltage flyback fais fab mov, txo qhov poob, txo cov zis ripple, thiab txhim kho tus ntoo khaub lig hloov tus nqi ntawm cov khoom siv hluav taws xob ntau. . Nws yog feem ntau tshwm sim hauv cov keyboards rau cov khoom siv hauv tsev Cov khoom siv hluav taws xob, xws li CD player, DVB set-top box, thiab lwm yam.
2. Yog tias qhov xwm txheej tsis tso cai kom nce cov tub ntxhais sib nqus, tib txoj hauv kev los txo qhov cuam tshuam ntawm qhov hluav taws xob yog txo lub voj voog ua haujlwm. Txo qhov cuam tshuam qhov hluav taws xob tuaj yeem txo qhov to inductance, tab sis nws tuaj yeem txo qhov kev hloov pauv hluav taws xob. Qhov ob yog qhov tsis sib xws. Yuav tsum muaj cov txheej txheem hloov pauv kom pom qhov tsim nyog. Thaum lub sij hawm transformer hloov qhov kev sim, thawj sab ntawm transformer tuaj yeem kuaj pom. Inverting lub ncov voltage, txo qhov dav thiab amplitude ntawm anti-peak voltage mem tes kom ntau li ntau tau yuav ua rau kom cov kev khiav hauj lwm kev ruaj ntseg npoo ntawm lub converter. Feem ntau, qhov cuam tshuam qhov hluav taws xob yog qhov tsim nyog ntawm 110V.
3. Txhim khu kev sib txuas, txo qhov poob, txais kev siv tshuab tshiab, thiab cov txheej txheem winding. Txhawm rau kom ua tau raws li cov cai tswj kev nyab xeeb, lub tshuab hloov pauv yuav siv cov kev ntsuas rwb thaiv tsev ntawm cov thawj sab thiab sab thib ob, xws li cov ntaub nplaum insulating thiab insulating daim kab xev. Cov no yuav cuam tshuam qhov kev ua tau zoo ntawm qhov inductance ntawm transformer. Nyob rau hauv qhov tseeb ntau lawm, thawj winding yuav siv tau los qhwv lub thib ob winding. Los yog qhov thib ob yog qhov txhab nrog triple insulated hlau, thiab cov insulator ntawm thawj thiab theem nrab raug tshem tawm los txhim kho qhov sib txuas, thiab txawm tias tooj liab dav siv tau rau winding.
Cov zis hluav taws xob tsawg hauv kab lus no hais txog qhov tso zis tsawg dua lossis sib npaug li 5V. Zoo li hom hluav taws xob qis hluav taws xob no, kuv qhov kev paub yog tias yog tias lub zog tso zis ntau dua 20W, hom rau pem hauv ntej tuaj yeem siv tau kom tau txais tus nqi zoo tshaj plaws. Tau kawg, qhov no tsis yog kiag li. Cov cwj pwm ntawm tus kheej muaj feem cuam tshuam nrog ib puag ncig kev thov. Lub sijhawm tom ntej, kuv yuav tham txog cov tub ntxhais sib nqus rau cov khoom siv hluav taws xob flyback thiab qee qhov kev nkag siab ntawm qhov sib txawv ntawm huab cua hauv cov hlau nplaum. Kuv vam tias koj tuaj yeem muab tswv yim rau kuv.
Cov tub ntxhais hlau nplaum ntawm lub flyback fais fab transformer ua haujlwm nyob rau hauv lub xeev unidirectional magnetization, yog li lub magnetic Circuit Court yuav tsum tau qhib qhov sib txawv ntawm huab cua, zoo ib yam li lub pulsating DC inductor. Ib feem ntawm qhov sib nqus Circuit Court yog ua ke los ntawm qhov sib txawv ntawm huab cua. Kuv nkag siab lub hauv paus ntsiab lus ntawm vim li cas qhov sib txawv ntawm huab cua qhib: txij li thaum lub zog ferrite kuj muaj cov yam ntxwv ua haujlwm nkhaus (hysteresis voj) uas zoo ib yam li lub duab plaub, Y axis ntawm qhov kev ua haujlwm ntawm tus yam ntxwv nkhaus sawv cev rau qhov sib nqus induction siv (B), thiab cov txheej txheem ntau lawm tam sim no feem ntau Lub saturation point yog siab dua 400mT. Feem ntau, tus nqi no yuav tsum yog 200-300mT hauv qhov tsim. X-axis qhia lub zog sib nqus (H). Tus nqi no yog proportional rau lub zog magnetizing tam sim no. Qhib qhov sib txawv ntawm huab cua nyob rau hauv lub magnetic Circuit Court yog sib npaug rau tilting lub hysteresis voj ntawm cov hlau nplaum mus rau X-axis. Nyob rau hauv tib lub sib nqus induction siv, nws muaj peev xwm tiv tau ib tug loj magnetizing tam sim no, uas yog sib npaug rau khaws cia ntau zog nyob rau hauv lub magnetic core. Lub zog no yog khaws cia rau hauv lub raj hloov. Thaum nws tawm mus rau lub voj voog thauj khoom los ntawm qhov nruab nrab ntawm lub tshuab hloov pauv, qhov sib txawv ntawm lub tshuab hluav taws xob flyback muaj ob txoj haujlwm. Ib qho yog hloov lub zog ntau dua, thiab lwm qhov yog los tiv thaiv lub hauv paus ntawm kev nkag mus rau hauv saturation.
Lub transformer ntawm flyback fais fab mov ua hauj lwm nyob rau hauv ib tug unidirectional magnetization xeev, tsis tsuas yog hloov lub zog los ntawm sib nqus coupling, tab sis kuj mus ua ntau yam zog ntawm voltage converter input thiab tso zis cais. Yog li ntawd, kev kho ntawm huab cua sib txawv yuav tsum tau ceev faj heev. Yog tias qhov sib txawv ntawm huab cua loj dhau lawm, qhov xau inductance yuav nce, hysteresis poob yuav nce, thiab cov hlau poob thiab tooj liab yuav nce, uas yuav cuam tshuam rau tag nrho cov kev ua tau zoo ntawm cov khoom siv hluav taws xob. Qhov me me dhau ntawm qhov sib txawv ntawm huab cua tuaj yeem ua rau lub cev hloov pauv, ua rau muaj kev puas tsuaj rau lub zog
Lub thiaj li hu ua nruam thiab tsis tu ncua hom ntawm flyback fais fab mov yog hais txog lub xeev ua hauj lwm ntawm lub transformer. Nyob rau hauv tag nrho lub xeev load, lub transformer ua hauj lwm nyob rau hauv lub ua hauj lwm hom ntawm tag nrho cov zog hloov los yog tsis tiav hloov. Feem ntau, nws yuav tsum tau tsim raws li qhov chaw ua haujlwm. Cov pa flyback fais fab mov yuav tsum ua hauj lwm nyob rau hauv tas mus li hom, thiaj li hais tias qhov poob ntawm lub hloov lub raj thiab cov kab yog me me, thiab cov kev ua hauj lwm ntawm lub zog ntawm input thiab output capacitors yuav txo tau, tab sis muaj ib co kev zam. Nws yuav tsum tau taw qhia rau ntawm no: vim yog cov yam ntxwv ntawm flyback fais fab mov, nws yog tsim nyog los tsim raws li ib tug high-voltage fais fab mov, thiab high-voltage fais fab mov transformer feem ntau ua hauj lwm nyob rau hauv discontinuous hom. Kuv nkag siab tias vim tias qhov tso zis ntawm lub zog hluav taws xob siab yuav tsum tau siv lub zog hluav taws xob rectifier diode. Vim yog cov yam ntxwv ntawm cov txheej txheem tsim khoom, lub siab rov qab voltage diode muaj lub sijhawm rov qab mus ntev thiab tsis muaj kev ceev. Nyob rau hauv lub tam sim no tas mus li lub xeev, lub diode rov qab thaum muaj kev tsis ncaj ncees rau pem hauv ntej, thiab lub zog poob thaum lub sij hawm rov qab yog loj heev, uas yog tsis conducive rau kev ua tau zoo ntawm lub converter. Qhov kev txhim kho yuav txo qhov kev hloov dua siab tshiab tsawg kawg, lub raj rectifier yuav kub siab heev, thiab txawm hlawv lub raj rectifier ntawm qhov phem tshaj. Txij li thaum lub diode rov qab biased ntawm xoom bias nyob rau hauv discontinuous hom, poob yuav raug txo mus rau ib tug kuj tsawg theem. Yog li ntawd, cov khoom siv hluav taws xob high-voltage ua haujlwm nyob rau hauv hom tsis tu ncua, thiab kev khiav hauj lwm zaus tsis tuaj yeem siab dhau. Kuj tseem muaj hom flyback fais fab mov uas ua haujlwm hauv lub xeev tseem ceeb. Feem ntau, hom khoom siv fais fab no ua haujlwm nyob rau hauv zaus hloov kho hom, lossis zaus hloov kho thiab dav hloov dual hom. Qee cov khoom siv hluav taws xob qis rau tus kheej (RCC) feem ntau siv daim ntawv no. Txhawm rau kom ntseeg tau tias cov zis ruaj khov, lub transformer Kev ua haujlwm zaus hloov nrog cov zis tam sim no lossis cov khoom siv hluav taws xob. Thaum lub transformer nyob ze rau tag nrho cov load, lub transformer yog ib txwm khaws cia ntawm tas mus li thiab intermittent. Hom kev siv fais fab no tsuas yog tsim nyog rau cov zis hluav taws xob tsawg, txwv tsis pub ua cov yam ntxwv ntawm electromagnetic compatibility yuav teeb meem heev.
Lub flyback switching fais fab mov transformer yuav tsum ua hauj lwm nyob rau hauv tas mus li hom, uas yuav tsum tau ib tug kuj loj winding inductance. Tau kawg, muaj qee qhov kev txuas ntxiv. Nws yog unrealistic mus nrhiav kev continuity ntau dhau lawm. Tej zaum nws yuav xav tau ib tug loj sib nqus core, thiab muaj ntau tus xov tooj ntawm lem ntawm lub kauj, nrog rau lub loj to taub inductance thiab faib capacitance, tej zaum yuav tsis tsim nyog lub tswm ciab. Yog li yuav ua li cas los txiav txim siab qhov ntsuas no, los ntawm ntau lub sijhawm ntawm kev xyaum thiab kev tsom xam ntawm kev tsim ntawm cov phooj ywg, kuv xav tias thaum lub nominal voltage yog input, cov zis mus txog 50 feem pua ~ 60 feem pua, thiab nws yog tsim nyog rau lub transformer rau kev hloov. los ntawm intermittent mus rau lub xeev nruam. Los yog nyob rau hauv lub xeev ntawm lub siab tshaj plaws input voltage, thaum cov zis yog tag nrho loaded, lub transformer yuav hloov mus rau ib tug tas mus li lub xeev.
