Kev ua haujlwm ntawm cov kua siv lead ua kua siv hluav taws xob yog qhov tseem ceeb los hloov 220V lub zog hluav taws xob mus rau ntau qhov chaw ruaj khov tam sim no xav tau rau kev ua haujlwm ntawm cov kua siv lead ua kua, thiab muab kev ua haujlwm voltage rau ntau yam tswj circuits, logic circuits, control panels, thiab lwm yam. .
1. Cov qauv ntawm cov kua siv lead ua kua zaub fais fab mov Circuit Court
Cov kua siv lead ua kua siv hluav taws xob siv hluav taws xob feem ntau tsim 5V, 12V ua haujlwm voltage. Ntawm lawv, 5V voltage feem ntau muab kev ua haujlwm voltage rau lub logic Circuit Court ntawm lub rooj tsavxwm loj thiab cov teeb pom kev ntawm lub vaj huam sib luag ua haujlwm; 12V voltage tsuas yog muab qhov ua haujlwm voltage rau lub rooj tsavxwm high-voltage thiab tsav tsheb.
Lub zog hluav taws xob feem ntau yog tsim los ntawm lim Circuit Court, choj rectifier lim circuit, lub ntsiab hloov Circuit Court, hloov transformer, rectifier lim circuit, tiv thaiv Circuit Court, soft start circuit, PWM maub los thiab lwm yam.
Ntawm lawv, lub luag haujlwm ntawm AC lim Circuit Court yog txhawm rau tshem tawm cov kev cuam tshuam ntau zaus hauv lub ntsiab (linear lim circuit feem ntau yog tsim los ntawm cov resistors, capacitors thiab inductors); Lub luag haujlwm ntawm tus choj rectifier lim Circuit Court yog hloov 220V AC rau 310V DC; Hloov Circuit Court Kev ua haujlwm ntawm rectification lim Circuit Court yog los hloov lub zog DC txog 310V los ntawm kev hloov lub raj thiab cov hloov pauv hloov mus rau hauv cov mem tes voltages sib txawv amplitudes; kev ua haujlwm ntawm rectification lim Circuit Court yog los hloov cov mem tes voltage tso zis los ntawm kev hloov pauv hloov mus rau hauv qhov yooj yim voltage 5V xav tau los ntawm cov load tom qab rectification thiab filtering thiab 12V; Kev ua haujlwm ntawm kev tiv thaiv overvoltage Circuit Court yog kom tsis txhob muaj kev puas tsuaj ntawm lub raj xa hluav taws xob lossis lub zog hloov hluav taws xob los ntawm kev thauj khoom txawv txav lossis lwm yam laj thawj; Lub luag haujlwm ntawm PWM maub los yog tswj kev hloov pauv ntawm lub raj hloov thiab tswj lub voj voog raws li cov lus tawm tswv yim ntawm kev tiv thaiv Circuit Court.
Thib ob, lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm cov kua siv lead ua kua tso saib lub zog hluav taws xob hluav taws xob
Lub hwj chim muab hluav taws xob ntawm cov kua siv lead ua kua zaub feem ntau lees txais cov kev hloov hluav taws xob hom. Lub zog hluav taws xob no hloov pauv AC 220V input voltage rau hauv DC voltage los ntawm kev hloov kho thiab lim dej, thiab tom qab ntawd raug txiav los ntawm lub raj hloov thiab nqis los ntawm lub tshuab hluav taws xob ntau zaus kom tau txais lub zog hluav taws xob ntau zaus. Tom qab rectification thiab filtering, DC voltage yuav tsum tau los ntawm txhua module ntawm lub LCD yog tso zis.
Cov nram qab no siv lub AOCLM729 kua siv lead ua kua ua piv txwv los piav qhia txoj hauv kev ua haujlwm ntawm cov kua siv lead ua kua siv hluav taws xob. Lub zog hluav taws xob ntawm AOCLM729 kua siv lead ua kua zaub yog tsim los ntawm AC lim circuit, choj rectifier circuit, soft start circuit, main switch circuit, rectifier filter circuit, overvoltage tiv thaiv Circuit Court thiab hais txog.
Lub cev daim duab ntawm lub hwj chim Circuit Board:
Schematic daim duab ntawm lub hwj chim Circuit Court:
- AC lim Circuit Court
Lub luag haujlwm ntawm AC lim Circuit Court yog lim tawm cov suab nrov uas tau qhia los ntawm AC input kab thiab suppress lub suab tawm tswv yim tawm hauv lub hwj chim.
Lub suab nrov hauv cov khoom siv hluav taws xob feem ntau suav nrog cov suab nrov nrov thiab ib txwm suab nrov. Rau ib-theem fais fab mov, muaj 2 AC fais fab xaim thiab 1 av xaim nyob rau sab nkag. Lub suab nrov tsim los ntawm ob txoj kab hluav taws xob AC thiab cov xaim hauv av ntawm lub hwj chim input sab yog cov suab nrov nrov; lub suab nrov tsim los ntawm ob txoj kab hluav taws xob AC yog lub suab nrov. Lub AC lim circuit feem ntau yog siv los lim tawm ob hom suab nrov. Tsis tas li ntawd, nws kuj ua hauj lwm raws li kev tiv thaiv Circuit Court overcurrent thiab tiv thaiv overvoltage. Ntawm lawv, fuse yog siv rau kev tiv thaiv overcurrent, thiab varistor yog siv rau kev tiv thaiv input voltage overvoltage. Daim duab hauv qab no yog daim duab schematic ntawm AC lim circuit.
Nyob rau hauv daim duab, inductors L901, L902, thiab capacitors C904, C903, C902, thiab C901 tsim EMI lim. Inductors L901 thiab L902 yog siv los lim cov suab nrov tsawg zaus; C901 thiab C902 yog siv los lim cov suab nrov tsawg zaus; C903 thiab C904 yog siv los lim cov suab nrov nrov thiab ib txwm muaj suab nrov (siab zaus electromagnetic cuam tshuam); tam sim no limiting resistor R901 thiab R902 yog siv los tso tawm lub capacitor thaum lub hwj chim ntsaws yog unplugged; Kev tuav pov hwm F901 yog siv rau kev tiv thaiv overcurrent, thiab varistor NR901 yog siv rau kev tiv thaiv input voltage overvoltage.
Thaum lub hwj chim ntsaws ntawm cov kua siv lead ua kua tso rau hauv lub qhov hluav taws xob, 220V AC hla dhau lub fuse F901 thiab varistor NR901 los tiv thaiv kev cuam tshuam, thiab tom qab ntawd dhau los ntawm cov khoom siv hluav taws xob uas muaj C901, C902, C903, C904, R901, R902, thiab inductors L901, L902. Nkag mus rau tus choj rectifier Circuit Court tom qab tiv thaiv kev cuam tshuam.
2. Choj rectifier lim Circuit Court
Kev ua haujlwm ntawm tus choj rectifier lim Circuit Court yog hloov 220V AC mus rau hauv DC voltage tom qab tag nrho-yoj rectification, thiab tom qab ntawd hloov qhov hluav taws xob mus rau ob zaug ntawm lub ntsiab voltage tom qab lim.
Tus choj rectifier lim Circuit Court yog tsim los ntawm choj rectifier DB901 thiab lim capacitor C905.
Nyob rau hauv daim duab, tus choj rectifier yog tsim los ntawm 4 rectifier diodes, thiab lim capacitor yog 400V capacitor. Thaum 220V AC mains lim, nws nkag mus rau tus choj rectifier. Tom qab tus choj rectifier ua tiav-yoj rectification ntawm AC mains, nws dhau los ua DC voltage. Tom qab ntawd qhov hluav taws xob DC hloov mus rau hauv 310V DC voltage los ntawm lim capacitor C905.
3. soft start circuit
Kev ua haujlwm ntawm qhov muag muag hluav taws xob yog los tiv thaiv qhov cuam tshuam tam sim no ntawm lub capacitor kom ntseeg tau tias kev ua haujlwm ib txwm muaj thiab txhim khu kev qha ntawm kev hloov hluav taws xob. Txij li thaum thawj qhov hluav taws xob ntawm lub capacitor yog xoom thaum lub sij hawm lub input Circuit Court yog powered, ib tug loj instantaneous inrush tam sim no yuav tsum tau tsim, thiab tam sim no feem ntau yuav ua rau lub input fuse tshuab tawm, yog li ntawd ib tug mos-pib Circuit Court yuav tsum tau. raug teem. Qhov muag pib Circuit Court yog tsim los ntawm cov pib resistors, rectifier diodes, thiab lim capacitors. Raws li pom nyob rau hauv daim duab yog lub schematic daim duab ntawm lub soft start circuit.
Nyob rau hauv daim duab, cov resistors R906 thiab R907 yog sib npaug resistors ntawm 1MΩ. Txij li cov resistors no muaj tus nqi tiv thaiv loj, lawv cov haujlwm tam sim no tsawg heev. Thaum lub zog hloov hluav taws xob nyuam qhuav pib, qhov pib ua haujlwm tam sim no xav tau los ntawm SG6841 yog ntxiv rau lub davhlau ya nyob twg (pin 3) ntawm SG6841 tom qab tau nqis los ntawm 300V DC high voltage los ntawm cov resistors R906 thiab R907 kom paub txog kev pib muag muag. . Thaum lub raj hloov pauv hloov mus rau hauv lub xeev ua haujlwm ib txwm muaj, qhov hluav taws xob ntau zaus tsim los ntawm kev hloov pauv hloov tau raug kho thiab lim los ntawm rectifier diode D902 thiab lim capacitor C907, thiab tom qab ntawd dhau los ua qhov ua haujlwm voltage ntawm SG6841 nti, thiab pib- txheej txheem yog dhau lawm.
4. lub ntsiab hloov Circuit Court
Lub luag haujlwm ntawm lub ntsiab hloov hluav taws xob yog kom tau txais lub siab-frequency rectangular yoj voltage los ntawm kev hloov raj chopping thiab high-frequency transformer step-down.
Lub ntsiab hloov hluav taws xob yog tsim los ntawm kev hloov lub raj, PWM maub los, hloov pauv hloov hluav taws xob, tiv thaiv hluav taws xob tiv thaiv hluav taws xob, hluav taws xob tiv thaiv hluav taws xob thiab lwm yam.
Hauv daim duab, SG6841 yog PWM maub los, uas yog lub hauv paus ntawm kev hloov hluav taws xob. Nws tuaj yeem tsim lub teeb liab tsav tsheb nrog lub sijhawm ruaj khov thiab qhov dav dav ntawm cov mem tes adjustable, thiab tswj lub xeev ntawm lub tshuab hluav taws xob hloov hluav taws xob, yog li kho cov zis hluav taws xob kom ua tiav lub hom phiaj ntawm qhov hluav taws xob stabilization. . Q903 yog lub raj xa hluav taws xob, T901 yog lub tshuab hloov pauv, thiab lub voj voog tsim los ntawm qhov hluav taws xob tswj lub raj ZD901, resistor R911, transistors Q902 thiab Q901, thiab resistor R901 yog ib qho kev tiv thaiv overvoltage circuit.
Thaum PWM pib ua hauj lwm, tus 8 tus pin ntawm SG6841 outputs ib lub voj voog mem tes yoj (feem ntau zaus ntawm cov zis mem tes yog 58.5kHz, thiab lub voj voog ua haujlwm yog 11.4%). Lub mem tes tswj lub raj hloov Q903 los ua kev hloov pauv raws li nws qhov kev ua haujlwm zaus. Thaum lub raj hloov Q903 tsis tu ncua qhib / tawm los ua tus kheej zoo siab oscillation, lub transformer T901 pib ua hauj lwm thiab generates ib tug oscillating voltage.
Thaum cov zis davhlau ya nyob twg ntawm tus pin 8 ntawm SG6841 yog qib siab, lub raj hloov Q903 tau qhib, thiab tom qab ntawd cov kauj ruam tseem ceeb ntawm kev hloov pauv hloov T901 muaj qhov tam sim no ntws los ntawm nws, uas ua rau muaj qhov zoo thiab qhov tsis zoo; Nyob rau tib lub sij hawm, theem nrab ntawm lub transformer generates zoo thiab tsis zoo voltages. Lub sijhawm no, lub diode D910 nyob rau theem nrab raug txiav tawm, thiab theem no yog lub zog cia theem; Thaum cov zis davhlau ya nyob twg ntawm tus pin 8 ntawm SG6841 nyob rau theem qis, lub raj hloov Q903 raug txiav tawm, thiab tam sim no ntawm thawj kauj ruam ntawm kev hloov pauv hloov T901 hloov tam sim ntawd. yog 0, lub zog electromotive ntawm lub hauv paus yog qis dua qhov zoo thiab sab sauv tsis zoo, thiab lub zog hluav taws xob ntawm sab sauv zoo thiab qis qis yog induced ntawm theem nrab. Lub sijhawm no, lub diode D910 tau qhib thiab pib tawm qhov hluav taws xob.
(1) Overcurrent tiv thaiv Circuit Court
Lub hauv paus ntsiab lus ua haujlwm ntawm overcurrent tiv thaiv Circuit Court yog raws li nram no.
Tom qab lub raj hloov Q903 tau qhib, tam sim no yuav ntws los ntawm qhov ntws mus rau qhov chaw ntawm lub raj hloov Q903, thiab qhov hluav taws xob yuav raug tsim tawm ntawm R917. Resistor R917 yog qhov ntsuas tam sim no, thiab qhov hluav taws xob tsim los ntawm nws yog ncaj qha ntxiv rau qhov tsis-inverting input davhlau ya nyob twg ntawm lub overcurrent detection piv ntawm PWM maub los SG6841 nti (namely pin 6), tsuav yog qhov voltage tshaj 1V, nws yuav ua rau PWM maub los SG6841 sab hauv Kev tiv thaiv tam sim no pib, kom tus 8 tus pin nres tso tawm cov mem tes nthwv dej, thiab lub raj hloov pauv thiab hloov pauv hloov tsis ua haujlwm kom paub txog kev tiv thaiv dhau tam sim no.
(2) High voltage tiv thaiv Circuit Court
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm high voltage tiv thaiv Circuit Court yog raws li nram no.
Thaum cov kab hluav taws xob hluav taws xob nce siab tshaj tus nqi siab tshaj plaws, qhov tso zis hluav taws xob ntawm lub tshuab hluav taws xob tawm tswv yim coil tseem yuav nce ntxiv. Qhov voltage yuav tshaj 20V, lub sij hawm no lub voltage regulator raj ZD901 puas lawm, thiab ib tug voltage poob tshwm sim ntawm tus resistor R911. Thaum qhov hluav taws xob poob qis yog 0.6V, lub transistor Q902 tau qhib, thiab tom qab ntawd lub hauv paus ntawm transistor Q901 dhau los ua qib siab, yog li ntawd lub transistor Q901 kuj tseem qhib. Nyob rau tib lub sijhawm, lub diode D903 kuj tseem qhib, ua rau 4 tus pin ntawm PWM maub los SG6841 nti rau hauv av, ua rau muaj qhov tam sim no luv luv tam sim no, uas ua rau PWM maub los SG6841 sai sai tua cov mem tes tawm.
Tsis tas li ntawd, tom qab lub transistor Q902 qhib, 15V siv voltage ntawm tus pin 7 ntawm PWM maub los SG6841 yog ncaj qha grounded los ntawm resistor R909 thiab transistor Q901. Nyob rau hauv txoj kev no, qhov hluav taws xob ntawm lub zog hluav taws xob lub davhlau ya nyob twg ntawm PWM maub los SG6841 nti dhau los ua 0, PWM maub los nres tawm cov mem tes nthwv dej, thiab lub raj hloov pauv thiab hloov pauv hloov pauv tsis ua haujlwm kom ua tiav qhov kev tiv thaiv siab.
5. Rectifier lim Circuit Court
Lub luag haujlwm ntawm rectification lim Circuit Court yog kho thiab lim cov zis voltage ntawm lub transformer kom tau ib tug ruaj khov DC voltage. Vim tias qhov xau inductance ntawm qhov hloov pauv hloov pauv thiab qhov cuam tshuam los ntawm qhov rov qab rov qab tam sim no ntawm cov zis diode, ob qho tib si tsim muaj peev xwm cuam tshuam electromagnetic. Yog li ntawd, kom tau txais cov ntshiab 5V thiab 12V voltages, cov zis hluav taws xob ntawm qhov hloov pauv hloov yuav tsum tau kho thiab lim.
Lub rectifier lim Circuit Court yog tsim los ntawm diodes, lim resistors, lim capacitors, lim inductors, thiab lwm yam.
Nyob rau hauv daim duab, RC lim Circuit Court (resistor R920 thiab capacitor C920, resistor R922 thiab capacitor C921) txuas nyob rau hauv parallel mus rau lub diode D910 thiab D912 nyob rau theem nrab tso zis kawg ntawm lub switching transformer T901 yog siv los nqus cov surge voltage generated ntawm lub Diode D910 thiab D912.
Lub LC lim muaj li ntawm diode D910, capacitor C920, resistor R920, inductor L903, capacitors C922 thiab C924 tuaj yeem lim cov electromagnetic cuam tshuam ntawm 12V voltage tso zis los ntawm lub transformer thiab tso tawm ib tug ruaj khov 12V voltage.
Lub LC lim muaj xws li diode D912, capacitor C921, resistor R921, inductor L904, capacitors C923 thiab C925 tuaj yeem lim cov electromagnetic cuam tshuam ntawm 5V tso zis voltage ntawm lub transformer thiab tso tawm ib tug ruaj khov 5V voltage.
6. 12V / 5V regulator tswj Circuit Court
Txij li thaum 220V AC lub zog hluav taws xob hloov pauv hauv qee qhov ntau, thaum lub zog hluav taws xob nce siab, qhov tso zis hluav taws xob ntawm lub tshuab hluav taws xob hauv lub zog hluav taws xob kuj tseem yuav nce ntxiv. Txhawm rau kom tau txais kev ruaj khov 5V thiab 12V voltages, Regulator Circuit Court.
Lub 12V / 5V voltage regulator Circuit Court yog tsim los ntawm ib tug precision voltage regulator (TL431), ib tug optocoupler, ib tug PWM maub los, thiab ib tug voltage divider resistor.
Nyob rau hauv daim duab, IC902 yog optocoupler, IC903 yog ib tug precision voltage regulator, thiab resistors R924 thiab R926 yog voltage divider resistors.
Thaum lub hwj huam mov hluav taws xob ua haujlwm, 12V tso zis DC voltage yog muab faib los ntawm cov resistors R924 thiab R926, thiab qhov hluav taws xob yog tsim los ntawm R926, uas yog ncaj qha ntxiv rau TL431 precision voltage regulator (rau R davhlau ya nyob twg). Nws tuaj yeem paub los ntawm qhov tsis kam tiv thaiv ntawm Circuit Court Qhov voltage tsuas yog txaus los tig rau TL431. Nyob rau hauv txoj kev no, 5V voltage tuaj yeem ntws los ntawm optocoupler thiab precision voltage regulator. Thaum qhov tam sim no ntws los ntawm optocoupler LED, optocoupler IC902 pib ua haujlwm thiab ua tiav cov qauv ntsuas hluav taws xob.
Thaum lub 220V AC mains voltage nce thiab cov zis voltage nce raws li, tam sim no ntws los ntawm optocoupler IC902 kuj yuav nce raws li, thiab lub brightness ntawm lub teeb-emitting diode nyob rau hauv lub optocoupler kuj yuav nce raws li. Lub sab hauv ntawm lub phototransistor kuj ua me me nyob rau tib lub sij hawm, yog li ntawd lub conduction degree ntawm phototransistor davhlau ya nyob twg kuj yuav ntxiv dag zog. Thaum lub conduction degree ntawm phototransistor muaj zog, qhov voltage ntawm tus pin 2 ntawm PWM fais fab maub los SG6841 nti yuav poob rau tib lub sijhawm. Txij li thaum qhov hluav taws xob no tau ntxiv rau qhov inverting input ntawm qhov yuam kev hauv amplifier ntawm SG6841, lub voj voog lub luag haujlwm ntawm cov zis mem tes ntawm SG6841 yog tswj los txo cov zis voltage. Nyob rau hauv txoj kev no, lub overvoltage output tawm tswv yim voj yog tsim los ua kom tiav cov haujlwm ntawm stabilizing cov zis, thiab cov zis voltage yuav stabilized nyob ib ncig ntawm 12V thiab 5V tso zis.
lus qhia:
Lub optocoupler siv lub teeb ua qhov nruab nrab los xa cov teeb liab hluav taws xob. Nws muaj kev sib cais zoo ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, yog li nws tau siv dav hauv ntau yam circuits. Tam sim no, nws tau dhau los ua ib qho ntawm ntau haiv neeg thiab dav siv cov khoom siv optoelectronic. Lub optocoupler feem ntau muaj peb ntu: lub teeb emission, lub teeb txais tos, thiab teeb liab amplification. Lub input hluav taws xob teeb liab tsav lub teeb-emitting diode (LED) kom emit lub teeb ntawm ib co wavelength, uas tau txais los ntawm lub photodetector los tsim ib tug photocurrent, uas yog ntxiv amplified thiab tso zis. Qhov no ua tiav qhov kev hloov pauv hluav taws xob-optical-hluav taws xob, yog li ua lub luag haujlwm ntawm kev tawm tswv yim, tso tawm, thiab kev sib cais. Txij li thaum cov tswv yim thiab cov zis ntawm optocoupler raug cais tawm ntawm ib leeg, thiab cov teeb liab hluav taws xob sib kis tau muaj cov yam ntxwv ntawm unidirectionality, nws muaj peev xwm tiv thaiv hluav taws xob zoo thiab muaj peev xwm tiv thaiv kev cuam tshuam. Thiab vim hais tias cov tswv yim kawg ntawm lub optocoupler yog qhov qis-impedance uas ua haujlwm nyob rau hauv hom tam sim no, nws muaj qhov muaj peev xwm tsis lees paub ntau hom. Yog li ntawd, nws tuaj yeem txhim kho lub teeb liab-rau-suab nrov piv raws li lub davhlau ya nyob twg cais tawm hauv cov ntaub ntawv mus ntev. Raws li cov cuab yeej sib txuas rau kev sib cais ntawm cov teeb liab hauv computer digital kev sib txuas lus thiab kev tswj hwm lub sijhawm, nws tuaj yeem ua kom muaj kev ntseeg siab ntawm kev ua haujlwm hauv computer.
7. overvoltage tiv thaiv Circuit Court
Lub luag haujlwm ntawm kev tiv thaiv overvoltage Circuit Court yog txhawm rau txheeb xyuas qhov tso zis hluav taws xob ntawm cov khoom siv hluav taws xob. Thaum cov zis voltage ntawm lub transformer nce txawv txav, lub pulse output yog muab tua los ntawm PWM maub los kom ua tiav lub hom phiaj ntawm kev tiv thaiv Circuit Court.
Lub overvoltage tiv thaiv Circuit Court feem ntau yog tsim los ntawm PWM maub los, optocoupler, thiab lub tshuab hluav taws xob hluav taws xob. Raws li pom nyob rau hauv daim duab saum toj no, lub voltage regulator raj ZD902 los yog ZD903 nyob rau hauv lub Circuit Court schematic daim duab yog siv los xyuas cov zis voltage.
Thaum cov zis hluav taws xob theem nrab ntawm qhov hloov pauv hloov pauv hloov pauv txawv txav, qhov hluav taws xob tswj lub raj ZD902 lossis ZD903 yuav tawg, uas yuav ua rau lub teeb ci ntawm lub teeb pom kev hauv lub optocoupler nce qhov txawv txav, ua rau tus pin thib ob ntawm PWM maub los. kom dhau los ntawm optocoupler. Lub phototransistor nyob rau hauv lub cuab yeej yog grounded, lub PWM maub los sai sai txiav tawm cov mem tes tawm ntawm tus pin 8, thiab lub switching tube thiab switching transformer nres ua hauj lwm tam sim ntawd mus cuag lub hom phiaj ntawm kev tiv thaiv Circuit Court.
Post lub sij hawm: Oct-07-2023