1. Xa silungisa unikezelo lwamandla esikrini se-LED, kufuneka siqale sisebenzise i-multimeter ukuze sibone ukuba kukho isiphaluka esifutshane sokuphazamiseka kwisixhobo ngasinye samandla, njengebhulorho yokulungisa amandla, ityhubhu yokutshintsha, i-high-frequency high-high-power rectifier tube. , kwaye ingaba i-resistor ephezulu yamandla ecinezela i-surge current itshiswa ngaphandle.Emva koko, kufuneka siqaphele ukuba ukuxhathisa kwe-voltage ye-voltage nganye ayiqhelekanga.Ukuba ezi zixhobo zingentla zonakele, kufuneka sizitshintshe ngezitsha.

2. Emva kokugqiba ezi mvavanyo zingasentla, ukuba unikezelo lwamandla luvuliwe kwaye alukwazi ukusebenza ngokufanelekileyo, kufuneka sivavanye imodyuli ye-power factor (PFC) kunye ne-pulse width modulation component (PWM), hlaziya ulwazi olufanelekileyo, kwaye siziqhelanise nayo. imisebenzi yephini nganye yeemodyuli ze-PFC kunye ne-PWM kunye neemeko eziyimfuneko ekusebenzeni kwazo okuqhelekileyo.

3. Ukubonelela ngombane kunye nesekethe ye-PFC, kuyimfuneko ukulinganisa ukuba i-voltage kuzo zombini iziphelo ze-capacitor yokucoca malunga ne-380VDC.Ukuba kukho i-voltage malunga ne-380VDC, ibonisa ukuba imodyuli ye-PFC isebenza ngokuqhelekileyo.Emva koko, kuyimfuneko ukufumanisa imeko yokusebenza yemodyuli ye-PWM, ukulinganisa amandla e-terminal ye-VC, i-terminal ye-reference ye-voltage ye-voltage ye-VR, ukuqala nokulawula i-Vstart / Vcontrol i-terminal voltage, kwaye usebenzise i-220VAC / 220VAC i-transformer yokuhlukanisa ukubonelela amandla kwi-led. bonisa isikrini, Sebenzisa i-oscilloscope ukujonga ukuba i-waveform ye-PWM yemodyuli ye-CT isiphelo ukuya emhlabeni yi-Sawtooth wave wave okanye i-triangle wave ene-linearity elungileyo.Umzekelo, i-TL494 CT end yi-Sawtooth wave wave, kunye ne-FA5310 CT end yi-triangle wave.Ngaba i-waveform yemveliso ye-V0 i-odolo yomqondiso we-pulse emxinwa.

4. Kumsebenzi wokugcinwa kombane wesikrini se-LED, ezininzi izixhobo ze-LED zesikrini zisebenzisa i-UC38 × & Times;Uninzi lwamacandelo e-PWM angama-8 kuluhlu alusebenzi ngenxa yomonakalo wokuchasana kokuqala konikezelo lwamandla okanye ukuncipha kokusebenza kwe-chip.Xa kungekho VC emva kokuba i-R yesiphaluka iphukile, icandelo le-PWM alikwazi ukusebenza kwaye kufuneka litshintshwe kunye ne-resistor enexabiso elifanayo lokumelana namandla njengeyokuqala.Xa ukuqala kwangoku kwecandelo le-PWM kunyuka, ixabiso le-R lingancitshiswa de icandelo le-PWM lisebenze ngokuqhelekileyo.Xa kulungiswa umbane we-GE DR, imodyuli ye-PWM yayiyi-UC3843, kwaye akukho okunye okungaqhelekanga kufunyenwe.Emva kokudibanisa i-resistor ye-220K kwi-R (220K), inxalenye ye-PWM yasebenza kwaye i-voltage ephumayo yayiqhelekileyo.Ngamanye amaxesha, ngenxa yeempazamo zesiphaluka se-peripheral, i-voltage ye-5V ekupheleni kwe-VR yi-0V, kwaye icandelo le-PWM alisebenzi.Xa kulungiswa ukunikezelwa kwamandla kwekhamera ye-Kodak 8900, le meko idibana nayo.Isiphaluka sangaphandle esixhunywe kwi-VR ekupheleni sinqanyuliwe, kwaye i-VR iyatshintsha ukusuka kwi-0V ukuya kwi-5V.Icandelo le-PWM lisebenza ngokuqhelekileyo kwaye i-voltage ephumayo iqhelekile.

5. Xa kungekho mbane ojikelezayo kwi-380VDC kwi-capacitor yokucoca, kubonisa ukuba isekethe ye-PFC ayisebenzi kakuhle.Izikhonkwane zokufumanisa eziphambili zemodyuli ye-PFC yi-pini yegalelo lamandla e-VC, i-pini yokuqala ye-Vstart / control, i-CT kunye ne-RT pins, kunye ne-V0 izikhonkwane.Xa ulungisa ikhamera ye-Fuji 3000, vavanya ukuba akukho mbane we-380VDC kwi-capacitor yokucoca kwibhodi enye.I-VC, i-Vstart / control, i-CT kunye ne-RT waveforms kunye ne-V0 waveforms ziqhelekileyo.Ayikho i-V0 waveform kwi-G pole yokulinganisa ifuthe lokutshintsha amandla ityhubhu.Ekubeni i-FA5331 (PFC) iyinto yokupakisha, emva kwexesha elide lokusetyenziswa komatshini, kukho i-solder ephosakeleyo phakathi kwe-V0 ekupheleni kunye nebhodi, kwaye isibonakaliso se-V0 asithunyelwa kwi-G pole ye-Field-effect transistor. .Weld i-V0 ekupheleni kwi-solder joint ebhodini, kwaye usebenzise i-multimeter ukulinganisa i-voltage ye-380VDC ye-capacitor yokucoca.Xa i-terminal ye-Vstart / control terminal ikwinqanaba lamandla aphantsi kwaye i-PFC ayikwazi ukusebenza, kuyimfuneko ukufumanisa iisekethe ezifanelekileyo ezixhunyiwe kwi-periphery ekupheleni kwayo.