Inoshanda Kudzora kwe LED: Kuongorora PWM Dimming

By Martin Wan
Updated: March 27, 2023

Mwenje ye LED inoshandiswa zvakanyanya nekuda kwekushanda kwayo, kusimba, uye hupenyu hurefu. Chimwe chezvinhu zvakaomesesa nezvekushandisa ma LED kudzora kupenya kwavo. Pano, PWM dimming yakakosha. kudzora kwe LEDs PWM dimming inzira yekudzora kupenya kwe LED nekushandura kupuruzira kwehupamhi hwemagetsi ikozvino. PWM dimming iri kuramba ichinyanya kufarirwa senzira inoshanda uye inoshanda yekudzora mwenje we LED.

Chii chinonzi PWM dimming?

Kugona kwePWM kudzora zvakasiyana-siyana zvemidziyo mundima yega yega yemagetsi ndiyo inonyanya kukonzera kushandiswa kwayo kwakapararira muindasitiri yemazuva ano yemagetsi. PWM masiginecha anoshandiswa kudzikira maLED, kudzora mota, uye kumhanya assortment yemagetsi akasiyana midziyo. Saka, chii chiri kushanda kwePWM methodology?

PWM inzira yekudzikisa avhareji yesimba remagetsi rechiratidzo chemagetsi. Mukuwedzera, maitiro anopedzwa nekubudirira kuparadzanisa chiratidzo muzvikamu zvayo. Panyaya yekushanda, shanduko pakati pemutoro uye sosi inogona kukurumidza kuvhurwa nekudzima kuti itonge avhareji yazvino uye voltage inopihwa kumutoro.

Nekusiyanisa nguva yenguva iyo chiratidzo chakakwirira (ON) kana pasi (OFF), PWM inobvumira kupenya kwakasiyana-siyana (OFF). Kusiyana neanalog dimming, iyo inodzima maLED nekuchinja simba rekubuda, iyo PWM siginecha inogona kunge iri ON kana KUDZIMWA chero nguva, zvichireva kuti maLED anogona kuwana yakazara voltage kana kusave nemagetsi (kureva, kupa 10V pachinzvimbo che12V kusvika shandura kupenya).

Chii chinonzi Constant Current Reduction (CCR)?

The kuenderera kwazvino kuderedza nzira inopa yakadzikama ikozvino kuyerera kune iyo LED (CCR). Mukupesana nePWM nzira, umo iyo LED state inochinja pakati nepakati nekudzima, iyo LED inogara yakabatidzwa. Asi, iwe unogona kudzora kupenya kwe LED nekugadzirisa kana kushandura mazinga aripo uchishandisa CCR.

Zvakanakira zveCCR Dimming Method:

Yakanakira maapplication ari kure anoda hurefu hwewaya uye zvakaomesesa EMI zvakatemwa.
Vatyairi veCCR vane zvirambidzo zvepamusoro zvinobuda (60 V) pane vatyairi vePWM (24.8 V). Aya maratidziro anoshanda kune vatyairi veKirasi 2 vane UL-yakatenderwa kushandiswa munzvimbo mbiri dzakanyorova uye dzakaoma.

Zvakaipa zveCCR Dimming Method:

Kusaenderana nekugadzirwa kwechiedza che LED pamhepo yakadzikira kwazvo kunoita kuti nzira yeCCR ive isina kukodzera kumaapplication anoda kudzima pazasi pegumi muzana yekupenya kwakanyanya. Mukupedzisa, mashandiro eLED anogadzirwa neiyi nzira pamazinga aripo aya ari subpar.
Kuderera kwekutyaira ikozvino kunotungamirira kune risingawirirani hue.

PWM seA Dimming Signal

Ngatiwedzerei pane yedu yazvino manzwisisiro e pulse wide modulation. Zvino, iyo PWM inofanirwa kuzivikanwa sechiratidzo.

Pulse hupamhi modulation masiginecha ane akatevedzana e square-wave-shaped pulses (PWM). Kune nhongonya uye mipata mune waveform yechiratidzo chese. I-on-nguva ndiyo iyo simba rechiratidzo rakakwirira, asi nguva-yenguva ndiyo iyo simba rechiratidzo rakaderera.

Duty Cycle

Basa rekutenderera ndipo apo chiratidzo chinogona kuramba chakakwira mune dimming concept. Nekudaro, iyo chiratidzo ine 100% yebasa kutenderera kana ichigara iripo. Iyo PWM chiratidzo chiri-nguva inogona kugadziriswa. Kana iyo PWM yebasa cycle yakaiswa ku50%, chiratidzo chinomhanya 50% yenguva pachiri uye 50% kubva.

maitikiro

Iyo pulse wide modulation (PWM) chiratidzo frequency chimwe chinhu chakakosha. Iyo PWM frequency inosarudza kuti inokurumidza sei nguva - iyo nguva inotora kuti chiratidzo chibatike nekudzima - chinopedzwa neiyo PWM chiratidzo.

PWM se LED Driver Output

Kana iyo PWM chiratidzo ichishandurwa kuita DC voltage uye inoshandiswa seye Mutyairi weLED kubuda, pulse width modulation inoitika. Iyo PWM inobuda dunhu inocheka iyo DC LED mafungu pakati peiyo inobatidza uye yekudzima nyika pane yakakwirira frequency. Nekudaro, iyo flicker inokonzera shanduko mukubuda kwemwenje we LED haionekwe neziso remunhu.

Vanhu vanowanzo vhiringa zvinhu zvishoma maererano nemusiyano pakati pekubuda kwePWM uye chiratidzo chekudzima. Saka ngaticherechedzei zvinhu zvishoma.

Iyo meshini inogadzira chiratidzo chePWM sechiratidzo chedhijitari, chinoita kuti chienderane patambo inodzima. Kusiyana neizvi, mutyairi anosarudza kuburitsa ikozvino nekuona iyo PWM yebasa kutenderera.

PWM Dimming Drivers mumusika

PWM dimming drivers vari kuwedzera kukosha kune LED mwenje. Zvakangodaro, zvinodikanwa kuti uzive kuti PWM dimming drivers inogona kuitika nenzira mbiri dzakasiyana, uye ngationei kuti chii.

PWM yenhema Dimming

Chinangwa cheiyo yekunyepedzera dimming nzira ndeye kushandura PWM yekupinza kuita analogi yekudzora chiratidzo. A resistor-capacitor (RC) sefa inogara mukati memutyairi.

Iyo RC sefa inoshandura iyo PWM siginecha kune yakaenzana DC voltage zvichibva pane yebasa kutenderera. Fake PWM dimming ine mukana wekusava neruzha, uye hapana ruzha pane inobuda nekuti iyo LED ikozvino inoenderera.

Zvakangodaro, nzira iyi inonetsa sezvo iko kurongeka kwakashata kana iyo PWM's peak value iri pazasi 10V. Uyezve, iyo resistor-capacitor (RC) kukosha inodzikamisa kuwanda kweiyo PWM chiratidzo.

Real PWM Dimming

Mune chaiyo PWM dimming, ma LED anochinja nekudzima pa frequency uye yebasa kutenderera kwakataurwa. Kuvapo kweMCU kana microcontroller mumutyairi kunoita kuti chiratidzo chePWM chione peak voltages. Real PWM dimming inotsigira yakakura spectrum yePWM frequency.

Chinhu chakakosha chePWM dimming kugona kwayo kuchengetedza iyo chena poindi yekubuda kwe LED. Pamusoro pezvo, yakakwira referensi voltage level inodarika zvikanganiso zve offset inobvumidzwa.

Iyo mutyairi yekuvandudza software inoda vashandisi kutora PWM dimming mode.

Kushandura Duty Cycle (kupenya) NePWM

Nepo iyo inopihwa ichibatidzwa ON uye KUDZIMIRA nekukurumidza uchishandisa pulse wide modulation kubuda, iwo maLED haabatike. Duty Cycle izwi rinoshandiswa kutsanangura kuyerwa kwekupenya kwePWM.

Duty cycle ndiyo chikamu chenguva yekumhanya yedunhu iyo iri ON. Kutenderera kwebasa kunoratidzwa sechikamu, nezana muzana inomiririra iyo inopenya inogoneka mamiriro (yakazara ON) uye yakaderera muzana inokonzeresa kushomeka kwechiedza che LED.

Chiratidzo chePWM chine 50% yebasa kutenderera kana iri pa50% yenguva uye kubva pa50% yenguva. Chiratidzo chinoratidzika sesquare wave, uye kupenya kwemwenje kunofanirwa kunge kuri pakati peavhareji. Kana iyo yezana yakakura kupfuura 50%, chiratidzo chinopedza nguva yakawanda mu ON state pane iyo OFF state, uye zvinopesana kana basa rekutenderera riri pasi pe50%.

Pulse Width Modulation (PWM) vs. Analog Dimming ye LEDs

Nekukura kunoshamisa kwemwenje we LED pamusika, kwave nekukwira kwechisikigo kwekuda kwevatyairi ve LED vane hunyanzvi uye hwakanyatso gadziriswa. Kuti uchengetedze simba rinoshanda nesimba uye kuguma-kushandiswa kushanduka kwekugadzirwa kwe LED, "smart" magetsi emumugwagwa, tochi, uye zviratidzo zvedhijitari, pakati pezvimwe zvinoshandiswa, zvinoda kunyatsodzorwa uye, kazhinji, kushanda kwe dimming.

PWM Kubuda

Iine pulse wide modulation (PWM) dimming, iyo LED ikozvino inobatidzwa uye kudzima kwechinguva. Kuti udzivise kupenya, iyo yekubatidza / kudzima frequency inofanirwa kukurumidza kupfuura izvo zvingaonekwa neziso remunhu (kazhinji pamusoro pe100Hz). PWM dimming inogona kuitwa nenzira dzakasiyana siyana:

Kushandisa chiratidzo chePWM kushandura voltage zvakananga.
Nenzira yeakavhurika muunganidzi transistor
Ne microcontroller.

Avhareji yemazuva ano ye LED yakaenzana nehuwandu hwehuwandu hwezita rayo ikozvino uye dimming duty cycle. Mugadziri anofanirwa kufungawo kunonoka mukushandura kuburitsa kuvharika uye kutanga, izvo zvinoisa zvipimo paPWM dimming frequency uye basa kutenderera renji.

Analog Dimming

Kugadzirisa iyo LED ikozvino nhanho inonzi analog dimming. Kushandisa yekunze DC control voltage kana resistive dimming inogona kuita izvi. Kunyangwe chokwadi chekuti analog dimming ikozvino inobvumira kugadziridzwa kwemazinga, tembiricha yemavara inogona kuchinja. Analog dimming haikurudzirwe kune maapplication uko iyo hue ye LED yakakosha.

Ngatitarisei mutsauko wekutanga pakati pePWM & analog dimming

PWM Kubuda	Analog Dimming
Kupenya kunogadziriswa nekugadzirisa iyo peak ikozvino mutyairi	Kupenya kwakagadziriswa nekuchinja DC kuenda ku LED
Hapana Color Shift	Zvinogoneka Ruvara Shift se LED ikozvino shanduko
Matambudziko anogona kuitika azvino inrush	Hapana inrush ikozvino kune mudziyo
Frequency zvimisikidzo & zvinokwanisika frequency kunetseka	Hapana frequency kunetseka
Kuchinja kwakanyanya kwemutsara mukupenya	Kupenya mutsetse kwete zvakanaka
Lower Optical kune magetsi ekushanda	Yakakwira optical kune magetsi ekushanda (> lumens pa watt inopedzwa)

Hardware Kufunga KwePWM

PWM dimming inoda zvimwe zvinotariswa paunenge uchigadzira sisitimu (kana PC board).

Mutyairi anowanzo kudiwa ane backlight-mhando LEDs nekuda kweiyo nhanho. Kubuda kwedhijitari, senge kubva kune microcontroller, haigone kushandiswa kuityaira zvakananga.

Iyo yakatwasuka logic level FET (Field-Effect Transistor) mhando transistor inowanzo shandiswa semutyairi mumashandisirwo akasiyana siyana. Inopikisa pagedhi inofanirwa kushandiswa kushandura iyo FET kudzora gedhi razvino, uye chinopikisa chinodiwa kana kurambidzwa kwazvino kuchidikanwa. Ita shuwa kuti unotarisa kumusoro kwakakodzera backlight kutyaira voltages uye currents paLCD dhatabheti.

A switching-type LED mutyairi anogona kutyaira iyo LED backlight pamhepo yakakwira uye zvakanyanya. Aya madhiraivha akaomarara, uye nyanzvi IC inowanzobata basa rekuchinja. Iyo PWM yekuisa pane akati wandei ICs yakagadzirirwa zvakajeka kune dimming application.

Kana microcontroller iri kushandiswa, kutarisirwa kunofanira kutorwa kuti ubatanidze kune pini inobuda inotsigira PWM (timer / counter) kubuda kana PWM inoshandiswa sechinhu che hardware.

PWM - Firmware/Software Kufunga

PWM dimming inoda mamwe masisitimu dhizaini kufunga (kana PC bhodhi).

Nekuti kune yakakwira ikozvino, backlight-mhando maLEDs anowanzoda mutyairi. Digital zvinobuda, senge izvo zvinobva kune microcontrollers, hazvigone kushandiswa kuityaira zvakananga.

Kazhinji, yakapusa logic level FET (Field-Effect Transistor) mhando transistor inoshandiswa semutyairi mumhando dzakasiyana dzekushandisa. Kuchinja iyo FET kuti itonge gedhi razvino kunoda chinopikisa pagedhi, uye chinopikisa chinodiwa kana kudzikamisa kwazvino kuchidikanwa. Tarisa iyo LCD dhatabheti yeiyo chaiyo backlight yekutyaira voltages uye mafungu.

A switching-type LED mutyairi anogona kutyaira iyo LED backlight zvinobudirira uye pamhepo huru. Aya madhiraivha akanyanya kuomarara, uye switching basa rinowanzo batwa neine nyanzvi IC. Mazhinji maICs 'PWM ekuisa akagadzirwa akagadzirirwa dimming application.

Kana PWM ikashandiswa sechishandiso chehardware, kutarisisa kunofanirwa kuitwa kubatanidza pini inobuda inotsigira PWM (timer/counter) inobuda pane microcontroller.

PWM Kushanda uye Zvishandiso

Kana nguva yekubatidza nekudzima yekuchinja ichichinjirwa kune imwe neimwe, huwandu hwemagetsi anounzwa kumutoro hunokwira. Sezvinotarisirwa, rudzi urwu rwekutonga runopa zvakawanda zvakanakira.

PWM yakapetwa nepamusoro pesimba rekutsvaga simba, kana kuti MPPT, ndiyo imwe yenzira dzekutanga dzekudzikisa kubuda kwesolar panel kuti zvive nyore kubhatiri kuishandisa.

PWM, kune rumwe rutivi, yakanakira kupa simba inertial midziyo, senge mota, nekuti iyi yakasarudzika switching ine zvishoma mhedzisiro pavari. Nekuda kweiyo mutsara chinongedzo pakati pekushanda kwe LED uye kupinza voltage, izvi zvinoshandawo kune maLED.

Pamusoro pezvo, iyo PWM inochinja frequency haifanirwe kunge isina chekuita pamutoro, uye iyo inokonzeresa waveform inofanirwa kuve yakatsetseka zvakakwana kuti mutoro uzivikanwe.

Zvichienderana nechishandiso uye basa rayo, iyo yekuchinjisa frequency yemagetsi inozosiyana zvakanyanya. Magetsi emagetsi, macomputer emagetsi, uye maaudio amplifiers zvese zvinoda switching speed mumakumi kana mazana emakilohertz range.

Imwe mukana wakakosha wekutora PWM ndiko kuderera kwakanyanya kwesimba kurasikirwa mukuchinja zvishandiso. Kana switch yadzimwa, hapana ikozvino inoyerera kuburikidza nayo. Pamusoro pezvo, kana switch yabatidzwa uye ichitumira magetsi kumutoro wayo, pane inodonha voltage isingaite pairi.

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FAQs

Ehe, PWM dimming inoenderana nema LED ese. Iyo LED mutyairi wedunhu inoshandura iyo PWM siginecha's pulse wide kuti igadzirise yazvino yakapihwa kune iyo LED, ichibvumira kudzora kwakanaka kweiyo LED yekupenya level. Zvakadaro, pakusarudza mutyairi we LED PWM dimming solution, zvakakosha kuti titarise magadzirirwo emagetsi eiyo LED pamwe nezvinodiwa zvemagetsi kuvimbisa kushanda kwakanyanya uye kushanda kwakachengeteka.

Iyo inomiririra inomiririra ye pulse-width modulation (PWM) chiratidzo chinoshandiswa kudzima mwenje we LED inodaidzwa sePWM dimming kuratidza. Chiratidzo chePWM chiratidzo cheskweya wave chinochinjana pakati pepamusoro uye yakaderera voltage mazinga. Kupenya kwe LED kunotariswa nehurefu hweiyo yakakwira voltage level (iyo pulse wide). Kazhinji, iyo PWM dimming inoratidzira inopa girafu yePWM chiratidzo, ine x-axis inoratidza nguva uye y-axis inomiririra voltage mazinga. Vashandisi vanogona kushandisa chiratidziro kuti vaone chiratidzo chePWM uye vachinje kutenderera kwebasa kuti vawane kupenya kwaunoda.

Ma LED anoshandisa PWM dimming kugadzirisa kupenya kwavo mazinga uye kuchengetedza simba. Ma LED anobudisa chiedza kana ikozvino inofamba ne semiconductor, kusiyana ne-incandescent bulbs, iyo inobudisa chiedza kana ichipisa nemagetsi. Izvi zvinoratidza kuti kupenya kwe LED kunoenderana nehuwandu hwemagetsi anotumirwa kuburikidza nawo.

Nekuchinja kupuruzira hupamhi hwechiratidzo chePWM, mutyairi we LED anogona kusiyanisa ikozvino inounzwa ku LED. Mutyairi we LED anomisa huwandu hwemagetsi ezvino anounzwa ku LED nekudzikisa hupamhi hwepurusi, zvichikonzera kuderera kwekupenya. Izvi zvinochengetedza simba uye zvinowedzera hupenyu hwe LED.

Uyezve, kana ichienzaniswa neanalog dimming, PWM dimming inobvumira kunyatso kudzora kupenya kwe LEDs. Analog dimming inoshanda nekudzikisa voltage inoiswa kune iyo LED, izvo zvinogona kukonzera kupenya uye kusaenzana dimming. PWM dimming, kune rumwe rutivi, inopa yakawedzera kugara uye yakatsetseka dimming chiitiko.

Pakazere, PWM dimming inzira yakakosha yekugadzirisa kupenya kwe LED uye kuwedzera simba hupfumi.

Kuti udzikise LED nePWM, iwe uchada PWM-inokwanisa LED mutyairi uye mutongi anogona kuburitsa chiratidzo chePWM. Aya anotevera matanho ekudzima LED nePWM:

1. Sarudza mutyairi we LED anotsigira PWM dimming: Iva nechokwadi chokuti mutyairi we LED waunosarudza unotsigira PWM dimming uye inopindirana ne LED yaunoda kushandisa.

2. Sarudza PWM controller: Sarudza PWM controller inokwanisa kugadzira chiratidzo chePWM chinoenderana nemutyairi weLED wawakasarudza.

Batanidza mutyairi we LED uye PWM controller sezvinotevera: Batanidza iyo PWM controller inobuda kune dimming yekuisa yemutyairi weLED. Gara uchiomerera kune iyo wiring schematic yakapihwa ne LED driver mugadziri.

4. Sarudza kutenderera kwebasa: Kutenderera kwebasa chikamu chenguva iyo chiratidzo chePWM "chakabatidzwa." Kupenya kwe LED kunotsanangurwa nebasa rekutenderera. Iyo yakakura basa kutenderera inoburitsa inopenya LED, nepo yakaderera yebasa kutenderera ichiburitsa dimmer LED. Uchishandisa PWM controller, isa kutenderera kwebasa kune yaunoda kupenya nhanho.

5. Kuedza uye kugadzirisa: Kuti uwane chiyero chinodiwa chekupenya, edzai LED uye gadzirisa basa rekutenderera sezvinodiwa.

Kudzima LED nePWM kunosanganisira kusarudza inoenderana mutyairi weLED uye PWM controller, kuvabatanidza zvakakodzera, kushandura kutenderera kwebasa, wozoyedza nekugadzirisa kudzamara kupenya kwaunoda kwawanikwa.

Kana ichishandiswa nemwenje we LED, PWM dimmers inogona kuderedza kushandiswa kwesimba. PWM dimming inodzora huwandu hwemagetsi anotumirwa ku LED, iyo inoshandura zvakananga kupenya kwayo. Iyo PWM dimmer inoderedza kushandiswa kwesimba kweiyo LED nekudzikisa ikozvino yaunzwa kwairi.

PWM dimming muLED Terevhizheni inzira yekugadzirisa kupenya kwescreen nekukurumidza kubatidza nekudzima backlight. Iyo inochengetedza simba uye inonatsiridza mutsauko ratios, asi inogona zvakare kuburitsa flickering uye kufamba blur. Kugadzirisa izvi zvinonetsa, mamwe maTV eTV anoshandisa yakakwira-frequency PWM dimming maitiro.

Izvo zvinotemwa nekushandisa. Iyo yakakwira PWM frequency inobatsira pakudzima ma LEDs sezvo ichikonzera kushomeka kusinga nzwisisike uye kutsetseka kwekuita dimming. Iyo yakaderera PWM frequency, kune rumwe rutivi, inogona kubatsira kune mota yekudzora zvikumbiro sezvo ichidzikisa huwandu hwemagetsi emagetsi anogadzirwa nemota.

PWM haipfupise hupenyu hwema LED. PWM dimming, muchokwadi, inogona kubatsira kuwedzera hupenyu hwe LED nekudzikisa huwandu hwemagetsi anopihwa kune iyo LED, iyo inogona kudzivirira kuunganidza kupisa uye kurebesa hupenyu hwe LED.

Kwete, haasi ese magetsi e LED anodzima. Magetsi emwenje e LED anodzikira anotsanangurwa nemagetsi kuti ashandiswe neanodzora dimming. Izvo zvakakosha kuti utarise bhokisi remwenje we LED kana ma specs kuti uone kana isingadzimike.

Inotemerwa nemwenje we LED. Kudzima mamwe marambi e LED kunoda kuiswa kweakakodzera dimming control kana kutsiviwa kwemutyairi we LED ane dimmable LED driver. Zvakadaro, haasi ese mwenje e LED anogona kudzimwa, saka zvakakosha kuti uongorore maitiro emwenje we LED usati waedza kudzimaidza.

Iyo yakanakisa dimmer yemwenje ye LED inotemerwa pamhando ye LED uye LED mutyairi anoshandiswa. Izvo zvakakosha kuti usarudze dimmer yakavakirwa pachena kuti ishandiswe nemwenje we LED uye inoenderana nemagetsi zviyero zve LED uye mutyairi we LED. Mamwe marambi e LED anoda chaiwo mhando dzema dimmers, akadai seanotevera-kumucheto dimmers kana anotungamira-kumucheto dimmers, saka usati wanhonga dimmer, simbisa pasuru kana zvirevo zvemwenje we LED.

Kwete, PWM haichinje voltage yakapihwa kune inodzorwa mudziyo. Iyo inogadzirisa chiratidzo chebasa kutenderera, iyo inoshandura kureba kwenguva iyo chiratidzo chiri mu "pa" mamiriro uku ichichengeta voltage isingachinji.

Ma LED anogona kudzimwa nemagetsi. Imwe nzira yekudzima ma LED ndeye analog dimming, iyo inosanganisira kudzikisa magetsi anopiwa kune LED. PWM dimming, kune rumwe rutivi, inzira yakapararira yekudzima ma LEDs sezvo ichibvumira kupfava uye kwakanyatso kudzika kwekudzora.

PWM LED dimming inzira yekugadzirisa kupenya kwemarambi eLED nekukurumidza kubatidza nekudzima magetsi kuenda kuLED. Kugadzirisa kupuruzira kwehupamhi hwemagetsi emagetsi anopa iyo LED kunogadzira kupenya kunokurumidza kuti ziso remunhu rione. PWM LED dimming inochengetedza simba uye inopa yakapfava, yakanyatsojeka dimming control pane analog dimming.

Kwete, havasi vese vateveri vePWM vanoshanda pa12V. PWM mafeni anouya mumhando dzakasiyana dzemagetsi, kusanganisira 5V, 12V, uye 24V. Kuti uone kuenderana nechinhu chiri kutonhodzwa, tarisa chiyero chevoltage yePWM fan.

Ehe, voltage yakakosha muPWM. Iyo PWM chiratidzo chemagetsi inofanirwa kuenderana nemudziyo uri kudzorwa. Semuenzaniso, kana chishandiso chichida chiratidzo che5V PWM, kushandisa chiratidzo che12V PWM chinogona kuita kuti chisashande. Kuti uone kuenderana, tarisa zvakatemwa zvechinhu chiri kudzorwa uye PWM controller.

PWM inogona kushandiswa mune ese ari maviri alternating azvino uye akananga maapplication azvino. Chiratidzo chePWM, kune rumwe rutivi, chinofanira kugadziridzwa kurudzi rwechishandiso chega. Iyo PWM siginecha inofanirwa kushandurwa kuita AC waveform uchishandisa inverter kana yakaenzana midziyo yekushandisa muAC application. Chiratidzo chePWM chinogona kushandiswa zvakananga kudzora chishandiso chiri kufambiswa muDC maapplication.

Kwete, kushandisa 24V mutyairi we12V LED haina kurairwa. Kuti uvimbise kushanda kwakachengeteka uye kwakaringana, voltage inopihwa ku LED inofanirwa kuenderana neiyo voltage rating ye LED. Kushandisa mutyairi wevoltiji yepamusoro kunogona kukuvadza LED uye kupfupisa hupenyu hwayo. Izvo zvakakosha kuti usarudze mutyairi anoenderana nemagetsi zvinodiwa zve LED.

Hazvikurudzirwe kushandisa mutyairi we24V ane 12V mwenje we LED. Paunenge uchishandisa mutyairi wemagetsi akakwira, marambi e LED anogona kupisa uye kutadza nguva isati yakwana. Izvo zvakakosha kuti usarudze mutyairi anowirirana nevoltage zvinodiwa zvemwenje we LED ari kushandiswa.

Iyo yakanakira PWM frequency ye LED dimming inowanzoonekwa kunge iri pamusoro pe100 Hz kudzivirira kupenya kunooneka, uye kazhinji kutenderera 500 Hz kusvika 1 kHz kudzivirira ruzha runonzwika.

Kuti uderedze kupenya kana uchishandisa PWM dimming, unogona kushandisa yakakwira PWM frequency, wedzera kutenderera kwebasa, uye shandisa yakakura kukosha capacitor mu LED driver wedunhu. Pamusoro pezvo, iwe unogona zvakare kushandisa yakawedzera dimming tekinoroji senge analog dimming kana hybrid dimming.

Izvo zvakakosha zvekushandisa PWM dimming pamusoro pedzimwe nzira dzekudzima ndezvekuti iri nyore uye inodhura-inoshanda mhinduro, inopa yakakwira mwero wekurongeka, uye haiburitse kupisa kwakawanda. Pamusoro pezvo, PWM dimming inoenderana nehuwandu hwemadhiraivha e LED uye inogona kudzorwa zviri nyore neiyo microcontroller kana imwe dhijitari yedunhu.

pfupiso

PWM dimming inzira iri nyore uye isingadhuri yekugadzirisa kupenya kwemwenje we LED. PWM dimming ine mabhenefiti akasiyana pamusoro peanalog dimming, kusanganisira yakakwira simba rehupfumi, kunyatso kudzora, uye hupenyu hurefu. Inoita, zvisinei, inopa akati wandei nyaya, senge inobvira EMI uye kudiwa kweakakwira-frequency switching maseketi. Nekudaro, PWM dimming inzira yakakosha yekudzora mwenje weLED, uye ramangwana rayo rinoita serinovimbisa.

LEDYi inogadzira yepamusoro-soro LED mitsetse uye LED neon flex. Zvese zvigadzirwa zvedu zvinopfuura nepamusoro-tech marabhoritari kuve nechokwadi chemhando yepamusoro. Kunze kwezvo, isu tinopa zvinogoneka sarudzo pane yedu LED mitsetse uye neon flex. Saka, ye premium LED strip uye LED neon flex, contact LEDYi ASAP!

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Martin Wan

Hi, ndini Martin, Co-muvambi we LEDYi Lighting. Ndanga ndichimhanyisa fekitori muChina inogadzira tambo ye LED uye neon ye LED kwemakore gumi izvozvi, uye chinangwa chechinyorwa ichi ndechekugovana ruzivo rwune chekuita ne LED strip uye LED neon kubva pakuona kwemupi weChinese.

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zvishongedzo

Inoshanda Kudzora kwe LED: Kuongorora PWM Dimming

Chii chinonzi PWM dimming?