Chinodzima LED chinogona kugadziriswa sei?

Nekuti tinoda kuziva kuti ndeapi ma lighting system anoda kuvandudzwa kana kutsiviwa, takasimbisa kukosha kwekuona kwakabva flicker (isimba reAC here kana kuti PWM?).

KanaChidimbu che LEDNdicho chikonzero chekudzima, uchafanira kuchichinja nechinhu chitsva chakagadzirwa kuti chigadzike simba reAC uye kuchishandura kuita DC current yakasimba, iyo inoshandiswa kufambisa maLED. Tsvaga "isina kudzima"Zvitupa uye zviyero zve "flicker" pakusarudza tambo ye LED kunyanya:

Musiyano uripo pakati pehuwandu hwechiedza chepamusoro nepadiki (amplitude) mukati mechiedza chechiedza unoratidzwa sechiyero cheperesenti chinonzi "flicker percentage." Kazhinji, bharubhu rechiedza rinopenya pakati pe10% ne20%. (nekuti shinda yaro inochengetedza kupisa kwayo panguva ye "mipata" muchiratidzo cheAC).

Flicker Index inzira inoyera huwandu uye nguva iyo LED inogadzira chiedza chakawanda kupfuura zvakajairwa panguva yekupenya. Flicker index yebhabhu reincandescent i0.04.

Mwero wekuti kutenderera kwechiedza kunozvidzokorora pasekondi unozivikanwa sehuwandu hwechiedza uye unoratidzwa mu hertz (Hz). Nekuda kwehuwandu hwechiratidzo cheAC chinouya, mwenje mizhinji ye LED inoshanda pa 100-120 Hz. Ma level akafanana echiedza chechiedza nechiedza chechiedza haazokanganisi mababu ane ma frequency akakwira nekuda kwekuchinja kwawo nekukurumidza.

Pa 100–120 Hz, mababu mazhinji e LED anodzima. IEEE 1789 inokurudzira 8% yakachengeteka ("ine njodzi shoma") yekudzima panguva iyi, uye 3% kubvisa zvachose mhedzisiro yekudzima.

Uchafanirawo kutsiva PWM dimmer unit kana PWM dimmer kana controller iriyo inokonzera flicker. Mashoko akanaka ndeekuti sezvo LED strips kana zvimwe zvikamu zvisingaite kuti zvive izvo zvinokonzera flicker, PWM dimmer kana controller chete ndiyo inofanira kutsiviwa.

Paunenge uchitsvaga mhinduro yePWM isina kupenya, iva nechokwadi chekuti pane chiyero chefrequency chakatsanangurwa nekuti ndiyo yega PWM flicker metric inobatsira (nekuti inowanzova chiratidzo chine 100% flicker). Tinokurudzira PWM frequency ye25 kHz (25,000 Hz) kana kupfuura kune mhinduro yePWM isina kupenya.

Kutaura zvazviri, mitemo yakaita seIEEE 1789 inoratidza kuti maPWM light sources ane frequency ye3000 Hz ane frequency yakakwana yekuderedza zvizere kukanganiswa kwe flicker. Zvisinei, chimwe chezvakanakira zvekuwedzera frequency pamusoro pe20 kHz ndechekuti zvinobvisa mukana wekuti zvishandiso zvemagetsi zvigadzire ruzha runonzwika kana kuchema. Chikonzero cheizvi ndechekuti frequency yakanyanya kunzwika kune vanhu vazhinji i20,000 Hz, saka nekutaura chimwe chinhu pa25,000 Hz, semuenzaniso, unogona kudzivirira mukana wekurira kana kuchema kunonetsa, izvo zvinogona kuva dambudziko kana iwe uchinyanya kunzwa kana kana application yako ichinyanya kunzwa ruzha.