Tus tsav tsheb fais fab mov hloov AC mains hluav taws xob mus rau qhov ruaj khov, tswj DC tam sim no uas LEDs xav tau. Qhov kev tsim no yog qhov tseem ceeb ua kom txav cov teeb pom kev zoo los ntawm qhov yooj yim "tig" los ua kev txawj ntse, tunable, thiab ua tau zoo.
Tus tsav tsheb yooj yim muaj ob peb qhov tseem ceeb. Lub hwj chim input theem muaj xws li rectification (hloov AC rau pulsating DC) thiab lim (smoothing voltage). Lub zog tso zis theem muab kev tswj xyuas qhov tam sim no lossis qhov tsis tu ncua, uas yog qhov tseem ceeb vim tias LEDs yog cov khoom siv tam sim no. Thaum kawg, kev tiv thaiv circuits tiv thaiv qhov kub thiab txias, dhau-voltage, dhau-tam sim no, thiab luv luv Circuit Court, ua kom muaj kev ntseeg siab ntev nyob rau hauv ib puag ncig feem ntau ntub thiab plua plav ntawm chav loj hlob.
Tshaj li cov tsav tsheb yooj yim, cov khoom siv hluav taws xob ntau-channel dimming pab kom muaj kev ywj pheej hloov ntawm lub teeb sib txawv - piv txwv li, cov kab liab thiab xiav tuaj yeem tswj tau nyias. Cov txheej txheem tseem ceeb hauv qab no yogPulse Width Modulation (PWM). PWM sai hloov lub hwj chim transistor rau thiab tawm ntawm lub siab zaus (feem ntau pua mus rau txhiab Hz). Los ntawm kev sib txawv ntawm qhov sib piv ntawm lub sijhawm mus rau lub sijhawm (lub voj voog lub luag haujlwm), qhov nruab nrab tam sim no los ntawm txhua qhov LED channel yog tswj hwm, yog li kho qhov ci tsis hloov qhov tam sim no tus nqi tam sim no. Txoj kev no ua rau tsis muaj flicker-dawb dimming thiab khaws cia qhov tseeb spectral tso zis yuav tsum tau rau tej theem cog loj hlob.
Cov teeb pom kev zoo niaj hnub no feem ntau sib koom ua ke ntau lub PWM raws nrog microcontroller-raws li kev xav, tso cai rau cov neeg cog qoob loo rau cov phiaj xwm teeb pom kev zoo - los ntawm yub mus rau paj - tsuas yog los ntawm kev kho lub luag haujlwm cycles. Cov theem ntawm kev tswj no maximizes photosynthetic efficiency thiab txuag lub zog.
