1. Thaum kho lub LED zaub screen fais fab mov, peb yuav tsum xub siv ib tug multimeter los xyuas seb puas muaj ib tug puas luv luv Circuit Court nyob rau hauv txhua lub hwj chim ntaus ntawv, xws li lub hwj chim rectifier choj, hloov raj, high-frequency high-power rectifier raj. , thiab seb lub zog hluav taws xob siab uas tiv thaiv cov hluav taws xob hluav taws xob puas raug hlawv.Tom qab ntawd, peb yuav tsum xyuas seb qhov tsis kam ntawm txhua qhov chaw tso zis hluav taws xob yog qhov txawv txav.Yog tias cov khoom siv saum toj no puas lawm, peb yuav tsum hloov lawv nrog cov tshiab.

2. Tom qab ua tiav cov kev ntsuam xyuas saum toj no, yog tias lub zog hluav taws xob tau qhib thiab nws tseem tsis tuaj yeem ua haujlwm tau zoo, peb yuav tsum tau sim cov khoom siv fais fab (PFC) thiab pulse width modulation tivthaiv (PWM), tshuaj xyuas cov ntaub ntawv tseem ceeb, thiab paub txog peb tus kheej. lub zog ntawm txhua tus pin ntawm PFC thiab PWM modules thiab cov xwm txheej tsim nyog rau lawv txoj haujlwm ib txwm muaj.

3. Rau cov khoom siv hluav taws xob nrog PFC Circuit Court, nws yog ib qho tsim nyog los ntsuas seb qhov voltage ntawm ob qhov kawg ntawm lub lim capacitor yog li ntawm 380VDC.Yog tias muaj qhov voltage ntawm 380VDC, nws qhia tias PFC module ua haujlwm ib txwm.Tom qab ntawd, nws yog ib qho tsim nyog los kuaj xyuas lub xeev ua haujlwm ntawm PWM module, ntsuas nws lub hwj chim input davhlau ya nyob twg VC, siv voltage tso zis davhlau ya nyob twg VR, pib thiab tswj Vstart / Vcontrol davhlau ya nyob twg voltage, thiab siv 220VAC / 220VAC kev rho tawm transformer los muab lub zog rau cov coj. zaub screen, Siv lub oscilloscope los saib seb lub waveform ntawm PWM module CT kawg rau hauv av yog Sawtooth yoj yoj los yog daim duab peb sab yoj nrog zoo linearity.Piv txwv li, TL494 CT kawg yog Sawtooth yoj yoj, thiab FA5310 CT kawg yog daim duab peb sab yoj.Yog lub waveform ntawm cov zis V0 ib qho kev txiav txim nqaim mem tes teeb liab.

4. Nyob rau hauv kev saib xyuas ntawm LED zaub screen fais fab mov, ntau LED zaub screen fais fab mov siv UC38 ×& sij hawm;Feem ntau ntawm 8-pin PWM Cheebtsam hauv koob tsis ua haujlwm vim kev puas tsuaj rau qhov pib tsis kam ntawm lub zog hluav taws xob lossis kev ua haujlwm ntawm cov nti.Thaum tsis muaj VC tom qab R Circuit tawg lawm, PWM tivthaiv tsis tuaj yeem ua haujlwm thiab yuav tsum tau hloov nrog lub resistor nrog tib lub zog tiv thaiv tus nqi raws li qhov qub.Thaum pib tam sim no ntawm PWM tivthaiv nce, tus nqi R tuaj yeem raug txo kom txog thaum PWM tivthaiv tuaj yeem ua haujlwm ib txwm.Thaum kho lub GE DR fais fab mov, PWM module yog UC3843, thiab tsis pom muaj lwm yam txawv txav.Tom qab txuas 220K resistor rau R (220K), PWM tivthaiv tau ua haujlwm thiab qhov tso zis hluav taws xob yog qhov qub.Qee lub sij hawm, vim muaj qhov tsis zoo ntawm qhov hluav taws xob, 5V voltage ntawm VR kawg yog 0V, thiab PWM tivthaiv tsis ua haujlwm.Thaum kho lub zog ntawm lub koob yees duab Kodak 8900, qhov teeb meem no tau ntsib.Sab nraud Circuit Court txuas nrog VR kawg yog txiav, thiab VR hloov ntawm 0V mus rau 5V.PWM tivthaiv ua haujlwm ib txwm ua thiab cov zis hluav taws xob yog qhov qub.

5. Thaum tsis muaj qhov hluav taws xob nyob ib puag ncig 380VDC ntawm lub tshuab lim dej, nws qhia tau tias PFC Circuit Court tsis ua haujlwm zoo.Cov pins tseem ceeb ntawm PFC module yog lub zog nkag tus pin VC, pib tus pin Vstart / tswj, CT thiab RT pins, thiab V0 pins.Thaum kho lub koob yees duab Fuji 3000, sim tias tsis muaj 380VDC voltage ntawm lub lim capacitor ntawm ib lub rooj tsavxwm.VC, Vstart / tswj, CT thiab RT waveforms nrog rau V0 waveforms yog qhov qub.Tsis muaj V0 waveform ntawm G ncej ntawm kev ntsuas qhov cuam tshuam lub zog hloov raj.Txij li thaum FA5331 (PFC) yog cov khoom siv thaj, tom qab siv lub tshuab ntev ntev, muaj kev ua haujlwm tsis zoo ntawm V0 kawg thiab lub rooj tsavxwm, thiab V0 teeb liab tsis raug xa mus rau G ncej ntawm Field-effect transistor. .Weld lub V0 kawg rau qhov sib koom ua ke ntawm lub rooj tsavxwm, thiab siv lub tshuab multimeter los ntsuas qhov 380VDC voltage ntawm lub lim dej capacitor.Thaum lub Vstart / tswj lub davhlau ya nyob twg nyob rau theem qis zog thiab PFC tsis tuaj yeem ua haujlwm, nws yog ib qho tsim nyog yuav tsum kuaj xyuas cov khoom siv hluav taws xob txuas nrog rau qhov chaw nruab nrab ntawm nws qhov kawg.