Iyo LED flicker inogona kugadziriswa sei?

Nekuti isu tinofanirwa kuziva kuti ndedzipi zvikamu zvemagetsi system inoda kuvandudzwa kana kutsiviwa, isu takasimbisa kukosha kwazvakaita kuziva kwakabva flicker (isimba reAC kana PWM?).

Kana iyoLED STRIPndicho chikonzero chekufinyamisa, iwe unozofanirwa kuchichinjisa kunze kune chitsva chinogadzirwa kutsvedzerera kunze kwe AC simba uye kuishandura kuita yakagadzikana chaiyo DC ikozvino, iyo inozoshandiswa kutyaira maLED. Tsvaga "flicker free” certification uye flicker zviyero pakusarudza tambo ye LED kunyanya:

Musiyano wakaenzana pakati pehupamhi uye hudiki hwekupenya mwero (amplitude) mukati me flicker cycle inoratidzwa sechikamu chechikamu chinonzi "flicker percent." Kazhinji, girobhu re incandescent rinopenya pakati pe10% ne20%. (nokuti filament yayo inochengeta kumwe kupisa kwayo panguva ye "mipata" muchiratidzo che AC).

Flicker Index ndiyo metric inotara huwandu uye nguva yenguva iyo LED inogadzira mwenje wakawanda kupfuura wenguva dzose panguva yekutenderera kutenderera. Iyo flicker indekisi yegirobhu incandescent ndeye 0.04.

Muyero wekuti kutenderera kunodzokororwa pasekondi inozivikanwa seflicker frequency uye inoratidzwa mu hertz (Hz). Nekuda kwehuwandu hweiyo inouya AC chiratidzo, mazhinji emwenje e LED anozoshanda pa100-120 Hz. Kufanana kweflicker uye flicker index mazinga angave ane kushomeka kwema bulbs ane ma frequency epamusoro nekuda kwekukurumidza kushandura nguva.

Pa100-120 Hz, mazhinji emarabhu e LED anopenya. IEEE 1789 inokurudzira 8% yakachengeteka ("yakaderera njodzi") inopenya panguva iyi, uye 3% kubvisa zvachose mhedzisiro yeflicker.

Iwe zvakare unozofanirwa kutsiva iyo PWM dimmer unit kana iyo PWM dimmer kana controller iri iyo flicker chikonzero. Nhau dzakanaka ndedzekuti sezvo ma LED mitsetse kana zvimwe zvikamu zvisingaite sosi yekufinyamisa, chete iyo PWM dimmer kana controller ichada kutsiviwa.

Paunenge uchitsvaga mhinduro yePWM isina flicker, ita shuwa kuti pane yakajeka frequency rating nekuti ndiyo chete inobatsira PWM flicker metric (nekuti inowanzogara iri chiratidzo chine 100% flicker). Isu tinopa zano rePWM frequency ye25 kHz (25,000 Hz) kana kukwira kune mhinduro yePWM iyo isingabatike-isina.

Asi izvo, zviyero zvakaita seIEEE 1789 zvinoratidza kuti PWM mwenje masosi ane frequency ye3000 Hz ndeye yakakwira inokwana frequency kudzikisa zvizere mabatiro ekupenya. Nekudaro, imwe bhenefiti yekusimudza frequency pamusoro pe20 kHz ndeyekuti inobvisa mukana wemagetsi emagetsi maturusi kugadzira zvinonzwika kurira kana kuridza mhere. Chikonzero cheizvi ndechekuti iyo yakanyanya kunzwika frequency kune vanhu vazhinji i20,000 Hz, saka nekutsanangura chimwe chinhu pa25,000 Hz, semuenzaniso, unogona kudzivirira mukana wekugumburisa kana kuridza mhere mhere, izvo zvinogona kunetsa kana iwe uchinyanya kunzwira tsitsi. kana chikumbiro chako chiri kunyatsonzwa.