LED iri kuwedzera uye zvakanyanya kushandiswa mukugadzirisa mwenje. Kuwedzera kune zvakasarudzika zvakanakira nzira dzechinyakare dzekuvhenekesa, pamusoro pekuvandudza hupenyu hwehupenyu, kuvandudza kushanda kwemwenje masosi uye kurebesa hupenyu hwebasa rezvigadziriso zvemwenje, LED inoshandisa iyo yakasarudzika dimming basa kushandura tembiricha yeruvara uye kupenya kwechiedza. , uye inowana zvakazara mukana mukuru wekuchengetedza-simba maapplication.

The dimming kushanda zvakanaka kweMwenje we LEDzvigadziriso zvinoenderana neyakafanana LED mwenje sosi uye kutyaira magetsi ekupa.

Kazhinji,LED mwenje masosiinogona kupatsanurwa muzvikamu zviviri: imwechete LED diode mwenje sosi kana LED diode mwenje sosi ine kuramba. Mukushandisa, dzimwe nguva LED light sources dzakagadzirwa semodule ine DC-DC converter, uye mamodule akaoma akadaro haana kukurukurwa munyaya ino. Kana iyo LED mwenje sosi kana module iri yakaparadzana LED diode pachayo, yakajairika dimming nzira ndeyekugadzirisa amplitude ye LED yekuisa yazvino, saka kusarudzwa kwe LED drive simba kunofanirwa kureva ichi chimiro.

Yakajairika LED yakashata dimming mamiriro:

Kana iyo LED mutyairi wemagetsi ane inogadziriswa kubuda ikozvino inoshandiswa kudzima mwenje we LED, deadtravel idambudziko rakajairika. Kunyangwe iyoLED mutyairimagetsi anogona kushanda zvakanaka kana akazara mutoro, zviri pachena kuti dimming haina kutsvedza kana mutyairi we LED asiri mukutakura zvizere.

Mhinduro yeOutput Pulse Width Modulation (Kubuda PWM)

Kana simba remutyairi we LED richishandiswa ku LED chiedza bar dimming pasi pemutoro wakazara, hapana dambudziko rekufatravel. Nharo iri pamusoro ndeyechokwadi, asi haina kunyanya kushanda. Muchokwadi, mitsetse yemwenje ye LED inowanzoshandiswa mumashandisirwo akasiyana-siyana (mwenje wekushongedza / mwenje wekubatsira / kushambadzira mwenje) uko kureba hakugone kuverengerwa nenzira kwayo. Naizvozvo, yakareruka uye yakanakisa yekushandisa mhinduro ndeyekunyatso kusarudza LED mutyairi simba neinobuda pulse upamhi PWM dimming basa kuti uwane kudzima zvinodiwa zve LED mwenje mitsetse. Iyo inobuda kupenya inogona kuderedza kuderera kwekuchinja kwekupenya nekuda kwekutenderera kutenderera kwechiratidzo chekudzima. Iwo akakosha maparamendi ekusarudza edhiraivha magetsi ekugadzirisa dimming uye frequency yekubuda pulse wide modulation PWM. Iko kushoma kudzima simba kunofanirwa kunge kwakadzikira se 0.1% kuti uwane iyo 8bit dimming resolution yekusangana neese LED light bar dimming application. Iyo inobuda pulse wide modulation PWM frequency inofanirwa kunge yakakwira sezvinobvira, Kudzivirira dambudziko rekupenya kwechiedza rinotaurwa muTable (I), zvinoenderana neakakodzera tekinoroji mabhuku ekutsvagisa, iyo frequency inokurudzirwa kuve yakanyanya kupfuura 1.25 kHz kuderedza kupenya kwezvipoko zvinoonekwa nemaziso evanhu.