Piav kom meej txog peb hom xwm txheej uas qhov hloov pauv hluav taws xob txuas nrog lub dummy load
Lub zog hloov hluav taws xob yuav ua rau cov zis hluav taws xob poob qis thaum lub sijhawm thauj khoom luv luv, thiab cov zis hluav taws xob yuav nce ntxiv thaum lub load qhib-circuited lossis tsis muaj-load.
Lub dummy load hloov txoj kev yog feem ntau siv nyob rau hauv kev saib xyuas kom paub qhov txawv seb lub hwj chim mov yog faulty los yog lub load Circuit Court yog faulty. Hais txog kev xaiv ntawm dummy load, feem ntau xaiv 40W lossis 60W qhov muag teev raws li dummy loads (cov xim loj loj hauv TV tuaj yeem siv qhov muag teev saum 100W raws li dummy loads). thiab theem ntawm cov zis voltage.
Tab sis qhov tsis zoo kuj pom tseeb. Piv txwv li, lub xeev kub tsis kam ntawm 60W teeb lub teeb yog 500Ω, thaum lub xeev txias tsis kam tsuas yog txog 50Ω. Raws li cov lus hauv qab no, nws tuaj yeem pom tau tias kev xav tias lub ntsiab lus tawm ntawm lub zog hluav taws xob yog 100V, thaum lub teeb 60W yog siv los ua dummy load, qhov tam sim no thaum lub hwj huam mov ua haujlwm yog 200mA, tab sis lub ntsiab tseem ceeb. load tam sim no ntawm startup nce mus txog 2A, uas yog 10 npaug ntawm ib txwm ua hauj lwm tam sim no, Yog li ntawd, siv lub teeb raws li ib tug dummy load yuav yooj yim ua rau nws nyuaj rau pib lub hwj chim mov. Vim tias lub zog ntawm lub teeb ntau dua, qhov me me ntawm qhov txias tsis kam, yog li ntawd, qhov loj dua qhov pib tam sim no ntawm lub teeb hluav taws xob siab, qhov nyuaj dua nws yog qhov pib lub zog.
Thaum xam qhov pib tam sim no thiab ua hauj lwm tam sim no ntawm lub hwj huam mov, koj tuaj yeem siv tus qauv I=U/R los xam: lub load tam sim no yog 100V/50Ω=2A thaum lub hwj chim pib, thiab cov load tam sim no yog 100V / 500Ω=0.2A thaum lub hwj huam mov ua haujlwm. Yog: Cov saum toj no yog kev xam cov theoretical, thiab qhov tseeb yuav txawv. Txhawm rau txo qhov pib tam sim no, 50W hluav taws xob soldering hlau tuaj yeem siv los ua lub nra hnyav (ob qho tib si txias thiab kub lub xeev tsis kam yog 900Ω) lossis 50W / 300Ω resistor, uas yog qhov tseeb dua li siv 60W qhov muag teev.
Qee cov khoom siv hluav taws xob tuaj yeem txuas ncaj qha rau dummy loads, thaum lwm tus ua tsis tau. Cov teeb meem tshwj xeeb yuav tsum tau txheeb xyuas kom meej. Peb hom xwm txheej hauv qab no yuav piav qhia meej.
Thawj hom yog qhov sib cais zoo siab switching fais fab mov.
Rau cov khoom siv tshwj xeeb zoo siab uas tsis muaj kab pulse synchronization (xws li Changhong N2918 xim TV teeb), cov kab thauj khoom tuaj yeem raug txiav thiab txuas ncaj qha rau lub dummy load. Rau qhov sib txawv ntawm kev hloov pauv lub zog hluav taws xob nrog kab rov tav pulse zaus ntsuas phoo thiab ntsuas qhov tsis ncaj (xws li Panda 2928 xim TV), thaum lub dummy load yog txuas ncaj qha (tshwj xeeb tshaj yog nrog lub hwj chim loj xws li 150W), cov zis hluav taws xob tuaj yeem poob ntau. los yog Tsis muaj cov zis, vim hais tias ntawm cov khoom siv fais fab no, txawm hais tias qhov sib ntxiv ntawm kab rov tav pulses tsuas yog rau synchronization thiab zaus kaw, thiab tsis koom nrog oscillation, tab sis kab rov tav synchronization mem tes tuaj yeem ua ntej lub sijhawm tig ntawm lub raj hloov, thiab cov khoom siv hluav taws xob muaj lub peev xwm muaj zog tshaj plaws nyob rau lub sijhawm no, yog tias cov kab thauj khoom raug txiav tawm, txoj kab synchronization mem tes yuav poob nws cov txiaj ntsig, thiab lub peev xwm ntawm lub hwj huam mov nqa lub load yuav inevitably txo. Tsis tas li ntawd, qhov rhiab heev ntawm qhov ntsuas qhov ntsuas qhov ntsuas hluav taws xob tsis ncaj, thiab cov zis hluav taws xob yuav tsum txo qis. Txawm li cas los xij, yog tias cov khoom siv hluav taws xob zoo li no siv cov qauv coj ncaj qha (cov qauv ntsuas hluav taws xob raug coj los ntawm ob sab ntawm lub tshuab hloov hluav taws xob) rau cov khoom siv hluav taws xob zoo li no, vim tias qhov siab ntawm qhov hluav taws xob stabilization, nws tuaj yeem raug txiav tawm ntawm txoj kab. load thiab txuas ncaj qha mus rau lub dummy load los yog txawm tsis-load rau kev txij nkawm.
Hom thib ob yog kab rov tav pulse synchronous switching fais fab mov, uas tuaj yeem cuam tshuam cov kab rov tav thiab txuas ncaj qha mus rau dummy load.
Qhov kev hloov hluav taws xob hloov pauv no yog lub zog ntawm tus kheej zoo siab hloov hluav taws xob. Lub hom phiaj ntawm kev taw qhia rau pem hauv ntej thiab rov qab pulses nyob rau hauv lub hauv paus ntawm lub switching tube yog synchronize tus kheej-excited oscillation ntawm lub switching raj nrog rau kab rov tav mem tes, thiab mus cuam tshuam nrog oblique kab ntawm lub screen los ntawm lub mem tes hluav taws xob ntawm lub switching zog. muab. Txwv rau kab scan retracement kom tsis muaj kev cuam tshuam pom ntawm qhov screen. Kab rov tav pulse ntxiv rau lub hauv paus ntawm lub raj hloov pauv tsuas yog ua rau lub raj hloov pauv ua ntej lub sijhawm txiav tawm, thiab qhov tseem ceeb tsis yog ib qho kev pab cuam excitation, yog li nws yog hu ua kab rov tav pulse synchronous switching fais fab mov. Txoj hauv kev los txiav txim seb nws puas yog cov khoom siv hluav taws xob zoo li no yog tias thaum lub sijhawm rov qab mus ncig cov mem tes raug kaw, lub zog hloov pauv tsuas yog suab (vim tias qhov zaus oscillation qis dua), thiab cov zis hluav taws xob tsis poob. Yog li ntawd, cov khoom siv hluav taws xob no tuaj yeem raug txiav tawm ntawm kab scanning Circuit Court thiab kho los ntawm txoj kev dummy load.
Cov qeb thib peb yog qhov hloov pauv hluav taws xob rau kab rov tav pulse auxiliary excitation.
Lub retrograde mem tes ntawm no switching fais fab mov tsis tsuas yog ua kom tiav cov synchronization ntawm tus kheej-excited oscillation zaus ntawm switching fais fab mov, tab sis kuj yog ib feem tseem ceeb ntawm lub switching tube tawm tswv yim network. Cov txheej txheem ua haujlwm ntawm hom kev hloov hluav taws xob no yog: lub raj xa hluav taws xob ua rau nws tus kheej zoo siab oscillation tom qab pib, thiab nws cov lus tawm tswv yim tsuas tuaj yeem ua rau cov khoom siv hluav taws xob tsim hluav taws xob qis dua 40 feem pua ntawm cov khoom tso tawm ib txwm nyob rau hauv qhov ntsuas load. Kev tawm tswv yim rau lub raj hloov pauv rau kev pab cuam excitation, txhawm rau ua tiav qhov ntsuas hluav taws xob tso tawm. Qhov no muaj ob lub hom phiaj: ib qho yog kom muaj kev ua haujlwm ntawm kev tiv thaiv kev nqis tes ua. Thaum cov kab scanning Circuit Court tsis ua haujlwm, txawm tias nws qhib Circuit Court lossis luv luv, qhov tso zis hluav taws xob ntawm cov khoom siv hluav taws xob hloov pauv yuav poob mus rau 60 feem pua ntawm tus nqi qub, txo qhov kev puas tsuaj ntau. Qhov thib ob yog tias ob qho tib si cov khoom siv hluav taws xob thiab cov kab scan muaj lub sij hawm luv luv ntawm cov txheej txheem muag muag, uas txo qhov tsis ua hauj lwm ntawm cov khoom siv hluav taws xob thiab kab scan. Rau hom khoom siv hluav taws xob no, yog tias cov lus tawm tswv yim kab pulse Circuit Court raug tshem tawm, qhov tso zis hluav taws xob ntawm lub zog hluav taws xob yuav poob los ntawm 40 feem pua rau 60 feem pua, lossis txawm tias cov zis hluav taws xob yuav tsawg heev. Obviously, hom khoom siv fais fab no tsis tuaj yeem raug txiav ncaj qha thiab kho los ntawm txoj kev dummy load, vim hais tias txawm tias lub zog hluav taws xob Circuit Court yog ib txwm nyob rau lub sijhawm no, nws tsis tuaj yeem tso tawm qhov ntsuas hluav taws xob. Txoj hauv kev kom paub qhov txawv ntawm qhov tsis ua haujlwm ntawm lub zog hluav taws xob thiab cov kab scanning Circuit Court yog siv cov khoom siv hluav taws xob sab nraud los muab lub zog rau cov kab scanning Circuit Court ib leeg. Yog hais tias kab scanning Circuit Court ua hauj lwm ib txwm, nws txhais tau hais tias lub switching fais fab mov tsis zoo.
