Yuav ua li cas kuaj qhov kev ntseeg siab ntawm LED fais fab mov?
1. Piav ntau hom ntawv qhia tias qhov input voltage cuam tshuam rau cov zis voltage
(1) Voltage tswj coefficient
①Txoj cai voltage coefficient K
Nws txhais tau hais tias qhov piv ntawm cov zis DC voltage hloov △Uo ntawm cov tswj fais fab mov mus rau lub input grid voltage hloov △Ui thaum lub load tseem tsis hloov, uas yog, K=△Uo/△Ui.
② Tus txheeb ze voltage tswj coefficient S
Nws sawv cev rau qhov piv ntawm tus txheeb ze hloov pauv △Uo / Uo ntawm cov zis DC voltage Uo ntawm qhov voltage stabilizer rau cov txheeb ze hloov △Ui / Ui ntawm lub input grid voltage Ui thaum lub load tseem tsis hloov, uas yog, S{{0} }△Uo/Uo/△Ui/Ui.
(2) Lub zog hluav taws xob hloov kho tus nqi
Qhia txog kev hloov pauv ntawm cov zis hluav taws xob ntawm cov khoom siv hluav taws xob tswj hwm thaum lub tswv yim kab hluav taws xob hloov pauv los ntawm tus nqi ntsuas los ntawm ntxiv /- 10 feem pua , qee zaum qhia tias tus nqi kiag li.
(3) Voltage stability
Lub load tam sim no yog khaws cia ntawm txhua tus nqi nyob rau hauv qhov ntsuas qhov ntau, thiab tus txheeb ze hloov △Uo / Uo (feem pua tus nqi) ntawm cov zis hluav taws xob tshwm sim los ntawm kev hloov pauv ntawm qhov hluav taws xob input nyob rau hauv qhov kev teev tseg yog hu ua qhov voltage stability ntawm qhov voltage stabilizer. .
2. Ob peb daim ntawv qhia txog kev cuam tshuam ntawm lub nra ntawm cov zis voltage
(1) Kev cai thauj khoom (tseem hu ua kev cai tam sim no)
Raws li qhov ntsuas hluav taws xob hluav taws xob, thaum lub sijhawm thauj khoom tam sim no hloov ntawm xoom mus rau tus nqi loj dua, qhov kev hloov pauv loj dua ntawm cov zis hluav taws xob feem ntau yog qhia raws li feem pua, thiab qee zaum nws kuj tau hais tias qhov kev hloov pauv kiag li.
(2) Output resistance (tseem hu ua qhov sib npaug sab hauv lossis sab hauv tsis kam)
Raws li qhov ntsuas hluav taws xob hluav taws xob, qhov tso zis hluav taws xob hloov pauv △Uo vim qhov hloov pauv ntawm cov khoom thauj tam sim no △IL, tom qab ntawd cov zis tsis kam yog Ro=|△Uo/△IL|Ω.
3. Ntau daim ntawv ntsuas ntawm ripple voltage
(1) Ntau dua ripple voltage
Nyob rau hauv qhov ntsuas tso zis voltage thiab load tam sim no, tus nqi ntawm cov zis voltage ripple (nrog rau lub suab nrov), feem ntau qhia nyob rau hauv ncov tus nqi lossis rms tus nqi.
(2) Ripple coefficient Y (%)
Nyob rau hauv qhov ntsuas load tam sim no, qhov piv ntawm tus nqi zoo Urms ntawm cov zis ripple voltage rau cov zis DC voltage Uo, uas yog, Y=Umrs/Uox100 feem pua.
(3) Ripple voltage rejection piv
Raws li qhov teev ripple zaus (xws li 50HZ), qhov piv ntawm ripple voltage Ui- nyob rau hauv lub input voltage rau lub ripple voltage Uo- nyob rau hauv cov zis voltage, uas yog: ripple voltage suppression ratio=Ui-/Uo-.
4. Txhua qhov kev xav tau hluav taws xob
(1) Cov kev cai tag nrho ntawm cov qauv siv hluav taws xob
① Qhov yuav tsum tau muaj
UL, CSA, thiab VDE tag nrho cov lus qhia tshwj xeeb hais txog qhov chaw nyob thiab qhov chaw nyob deb ntawm qhov chaw nyob thiab nruab nrab ntawm qhov chaw nyob thiab cov hlau tsis muaj sia.
UL thiab CSA qhov yuav tsum tau muaj: nruab nrab ntawm cov hluav taws xob hluav taws xob hluav taws xob uas muaj qhov hluav taws xob sib cuam tshuam ntau dua lossis sib npaug ntawm 250VAC, thiab nruab nrab ntawm cov hluav taws xob hluav taws xob thiab cov hlau tsis muaj sia nyob (tsis suav cov xov hlau ntawm no), tsis muaj teeb meem ntawm qhov chaw los yog qhov chaw, yuav tsum muaj 0.1 Ntoo ho; VDE yuav tsum tau 3 hli creep los yog 2 hli clearance ntawm AC xov hlau; IEC cov cai: 3 hli tshem tawm ntawm AC xov hlau thiab 4 hli tshem tawm ntawm AC xov hlau thiab hauv av conductors. Tsis tas li ntawd, VDE thiab IEC yuav tsum muaj tsawg kawg yog 8 hli qhov chaw nruab nrab ntawm cov zis thiab cov khoom siv hluav taws xob.
② Dielectric txoj kev sim ntsuas
High voltage: nruab nrab ntawm cov tswv yim thiab cov zis, tawm tswv yim thiab hauv av, thiab cov tswv yim AC.
③ Kev ntsuas tam sim no
Cov dej xau tam sim no yog tam sim no ntws los ntawm cov xaim hauv av ntawm cov khoom siv sab nraud, thiab hauv cov khoom siv hluav taws xob hloov pauv, nws feem ntau yog cov xau tam sim no los ntawm bypass capacitor ntawm lub suab nrov suppression lim. Ob leeg UL thiab CSA xav kom cov khoom siv hlau tsis muaj hlau yuav tsum tau txuas nrog hauv av. Cov dej xau tam sim no ntsuas los ntawm kev sib txuas ntawm 1.5kΩ resistor ntawm cov khoom no thiab hauv av, thiab cov xau tam sim no yuav tsum tsis txhob siab dua 5mmA.
VDE tso cai rau 1.5kΩ resistor txuas nrog rau qhov sib npaug nrog 150nPF capacitor, thiab siv 1.06 npaug ntawm qhov ntsuas kev ua haujlwm voltage. Rau cov cuab yeej ua cov ntaub ntawv, cov xau tam sim no yuav tsum tsis txhob siab dua 3.5mA, feem ntau txog 1mA.
④ Kev ntsuas kev tiv thaiv hluav taws xob
VDE cov kev cai: yuav tsum muaj 7MΩ tsis kam ntawm cov khoom siv hluav taws xob thiab cov hluav taws xob qis qis, thiab 2MΩ tsis kam ntawm cov khoom siv hlau thiab cov khoom siv lossis 500V DC voltage rau 1min.
⑤ Printed Circuit Board
UL Sau npe 94V-2 cov khoom siv lossis zoo dua yog xav tau.
(2) Tag nrho cov kev cai rau cov qauv ntawm lub hwj chim transformer
① rwb thaiv tsev ntawm transformer
Cov hlau tooj liab siv nyob rau hauv winding ntawm lub transformer yuav tsum enameled hlau, thiab lwm yam hlau qhov chaw yuav tsum tau coated nrog insulating tshuaj xws li porcelain thiab xim.
② Lub zog dielectric ntawm lub transformer
Rwb thaiv tsev cracking thiab arcing yuav tsum tsis txhob tshwm sim thaum lub sij hawm sim.
③ rwb thaiv tsev tsis kam ntawm transformer
Lub rwb thaiv tsev tiv thaiv ntawm lub windings ntawm lub transformer yuav tsum yog tsawg kawg yog 10MΩ, thiab ib tug DC voltage ntawm 500 volts yuav tsum tau siv nyob rau hauv nruab nrab ntawm lub windings thiab cov hlau nplaum core, skeleton, thiab shielding txheej rau 1min, thiab tsis muaj puas los yog arcing yuav tsum tshwm sim.
④ Transformer humidity kuj
Lub transformer yuav tsum raug kuaj rau rwb thaiv tsev tsis kam thiab dielectric zog tam sim ntawd tom qab muab tso rau hauv ib qho chaw ntub thiab ua tau raws li qhov yuav tsum tau ua. Qhov chaw ntub dej feem ntau yog: qhov txheeb ze av noo yog 92 feem pua (qhov kam rau ua yog 2 feem pua), qhov kub thiab txias yog qhov ruaj khov ntawm 20 degree thiab 30 degree, thiab qhov yuam kev raug tso cai yog 1 feem pua. Nyob rau lub sijhawm no, qhov kub ntawm lub transformer nws tus kheej yuav tsum tsis txhob siab tshaj 4 degree siab tshaj qhov kev ntsuam xyuas ua ntej nkag mus rau qhov chaw ntub dej.
⑤ VDE qhov yuav tsum tau muaj ntawm cov yam ntxwv kub ntawm transformers.
⑥UL, CSA yuav tsum tau rau transformer kub yam ntxwv.
5. Electromagnetic compatibility xeem
Electromagnetic compatibility yog hais txog lub peev xwm ntawm lub cuab yeej lossis lub cev ua haujlwm ib txwm nyob hauv ib puag ncig electromagnetic yam tsis ua rau muaj kev cuam tshuam tsis zoo ntawm electromagnetic cuam tshuam rau txhua yam hauv ib puag ncig.
Feem ntau muaj ob txoj hauv kev nthuav tawm rau kev cuam tshuam ntawm electromagnetic cuam tshuam, uas yuav tsum tau soj ntsuam raws li txhua txoj hauv kev. Ib qho yog los nthuav tawm rau cov kab hluav taws xob nrog lub voj voog ntev dua los cuam tshuam rau thaj chaw emission, feem ntau hauv qab 30MHz. Xws li qhov ntev wavelength zaus tsawg tshaj li ib lub wavelength nyob rau hauv qhov ntev ntawm lub hwj chim qaum txuas nrog rau cov khoom siv hluav taws xob, thiab cov hluav taws xob hluav taws xob nyob rau hauv qhov chaw kuj yog me me. Los ntawm qhov no, qhov hluav taws xob tshwm sim ntawm lub zog hluav taws xob LED tuaj yeem tuav tau, thiab Kev Ntsuas Siab Zoo ntawm qhov cuam tshuam, uas yog hu ua suab nrov.
Thaum qhov zaus nce mus txog 30MHz, lub wavelength kuj yuav luv dua. Lub sijhawm no, yog tias tsuas yog lub suab nrov qhov voltage uas tshwm sim hauv cov kab hluav taws xob raug ntsuas, nws tsis phim qhov cuam tshuam tiag tiag. Yog li ntawd, ib txoj hauv kev los ntsuas qhov loj ntawm lub suab nrov los ntawm kev ntsuas ncaj qha ntawm kev cuam tshuam yoj propagating rau hauv qhov chaw, thiab lub suab nrov hu ua radiated suab nrov.
Muaj ob txoj hauv kev los ntsuas cov suab nrov nrov: ib txoj hauv kev ntsuas ncaj qha rau kev cuam tshuam yoj propagating nyob rau hauv qhov chaw raws li lub zog ntawm lub teb hluav taws xob, thiab ib txoj kev ntsuas lub zog xau mus rau cov khoom siv hluav taws xob.
Kev ntsuam xyuas electromagnetic compatibility suav nrog cov ntsiab lus hauv qab no:
① Sib nqus teb rhiab heev
(Immunity) Qib ntawm qhov tsis xav tau cov lus teb ntawm ib lub cuab yeej, subsystem lossis lub cev kom raug hluav taws xob hluav taws xob. Qhov qis dua qhov rhiab heev, qhov siab dua thiab qis dua lub suab nrov. Nrog rau cov zaus ruaj khov, qhov ntsuas peak-to-peak magnetic field test.
② Electrostatic tawm rhiab heev
Kev hloov pauv los ntawm qhov sib thooj lossis kev sib cuag ncaj qha ntawm cov khoom uas muaj peev xwm sib txawv electrostatic. Lub 300PF capacitor raug them rau 15000V thiab tawm los ntawm 500Ω resistor. Nws tuaj yeem tawm ntawm kev zam, tab sis nws yuav tsum yog qhov qub tom qab nws tiav lawm. Tom qab kev sim, cov ntaub ntawv xa mus thiab kev cia tsis tuaj yeem ploj.
③ LED lub zog hloov pauv rhiab heev
Xws li cov teeb liab rhiab heev (0.5μs, 10μs 2 zaug), voltage transient rhiab heev (10 feem pua ~ 30 feem pua, 30S rov qab), zaus zaus rhiab heev (5 feem pua ~ 10 feem pua, 30S rov qab).
④ Radiation rhiab heev
Ib qho kev ntsuas ntawm radiated interference teb uas degrade cov cuab yeej. (14kHz-1GHz, lub zog hluav taws xob yog 1V / M).
⑤ Kev ua haujlwm rhiab heev
Thaum ua rau cov lus teb tsis xav tau ntawm ib lub cuab yeej lossis ua rau nws qhov kev ua haujlwm tsis zoo.
Kev ntsuas ntawm kev cuam tshuam cov teeb liab lossis qhov hluav taws xob ntawm lub zog, tswj lossis cov kab teeb liab (30Hz txog 50kHz / 3V, 50kHz txog 400MHz / 1V).
⑥ Sib nqus teb cuam tshuam hauv lub xeev tsis ua haujlwm
Lub thawv ntim khoom yog 4.6m, thiab qhov sib nqus flux ceev yog tsawg dua 0.525μT; 0.9m, 0.525μT.
⑦ Sib nqus teb cuam tshuam hauv lub xeev ua haujlwm
Sab sauv, qis, sab laug thiab sab xis AC magnetic flux ceev yog tsawg dua 0.5mT.
⑧ Kev cuam tshuam cuam tshuam Kev cuam tshuam tau nthuav tawm raws tus neeg xyuas pib. 10kHz-30MHz, 60(48)dBμV.
⑨ Radiated cuam tshuam: electromagnetic cuam tshuam los ntawm qhov chaw nyob rau hauv daim ntawv ntawm electromagnetic tsis.
10kHz-1000MHz, 30 shielded chav 60(54)μV/m.
