TRIAC dimming zoo li flicker thaum kho kom qis qis (xws li hauv qab 20%) ntawm LED teeb. Qhov laj thawj tseem ceeb cuam tshuam nrog kev tsis sib haum xeeb ntawm kev ua haujlwm ntawm TRIAC thiab cov yam ntxwv hluav taws xob ntawm LED. Cov hauv qab no yog ib qho kev ntsuam xyuas ntxaws:
1. Tuav tam sim no ntawm TRIAC
TRIAC lub hauv paus ntsiab lus:
TRIAC dimming kho qhov ci los ntawm kev txiav AC waveform (theem txiav). Txhua lub sijhawm AC dhau xoom, TRIAC yuav tsum tau ua kom tig rau ntawm lub kaum sab xis tshwj xeeb (xws li 30 degree, 90 degree) thiab tua thaum tam sim no qis dua qhov tuav tam sim no (feem ntau 10-50mA).
LED muaj lub zog qis thiab qis tam sim no:
Incandescent teeb muaj lub zog siab (xws li 40W) thiab tam sim no loj (kwv yees 170mA), yog li TRIACs yooj yim rau kev tswj xyuas; thaum LED teeb muaj lub zog qis (xws li 5W) thiab qhov ua haujlwm tam sim no tsuas yog 20-30mA.
Thaum qhov ci ntsa iab raug hloov mus rau qis, lub sij hawm conduction luv luv, thiab tam sim no yuav qis dua qhov tuav tam sim no, ua rau lub thyristor kaw ntxov ntxov, ua rau lub teeb rov pib tsis tu ncua → flickering pom ntawm qhov muag liab qab.
2. Compatibility teeb meem ntawm LED tsav lub zog
Tsoos thyristor dimmers yog tsim los rau cov loads resistive (cov teeb incandescent), thaum LEDs yog capacitive / inductive loads thiab xav tau ib tug tshwj xeeb tsav tsheb fais fab mov los hloov lub voltage.
Teeb meem ntawm qhov ci qis:
Tus tsav tsheb fais fab mov yuav tsis muaj peev xwm kom tau txais lub zog txaus nyob rau hauv lub sij hawm luv luv conduction, ua rau cov zis tsis ruaj khov → LED flickering lossis tua.
Qee qhov qis- cov khoom siv tsav tsheb kawg tsis tau lim txaus thiab tsis tuaj yeem ua haujlwm zoo "fragmented" tam sim no tom qab theem txiav, ua rau muaj kev cuam tshuam ntau dua.
3. Tsis zoo sib xws ntawm dimmer thiab teeb
Leading Edge vs Trailing Edge dimmer:
Leading Edge dimmer (tseem ceeb TRIAC) txiav thawj ib nrab ntawm lub waveform thiab muaj ntau dua flickering ntawm tsawg brightness; Trailing Edge dimmer (xws li MOSFET) txiav qhov thib ob ib nrab, uas yog tsim nyog rau LEDs, tab sis tus nqi yog siab.
Dimmer yam tsawg kawg nkaus load txwv: Qee cov thyristor dimmers yuav tsum muaj qhov tsawg kawg nkaus load (xws li . 20W). Yog tias tag nrho LED lub zog tsis txaus (xws li tsuas yog 10W), lawv yuav tsis ua haujlwm ruaj khov ntawm qhov ci qis.
4. Kev daws teeb meem
(1) Xaiv cov teeb ci LED nrog kev sib raug zoo
Saib rau "TRIAC dimmable" daim ntawv lo thiab tshawb xyuas cov ntawv tshaj tawm kev xeem (xws li kev txhawb nqa 10% -100% dimming).
Zoo dua yog siv cov teeb ci LED nrog kev tsav tam sim no thiab cim "tsis muaj qhov ci tsis muaj flicker" (xws li Philips Hue, Osram).
(2) Hloov hom dimmer
Siv lub trailing ntug dimmer (xws li Lutron CL series) los yog cov dimming (xws liDALI, 0-10V).
Siv cov kev daws teeb meem ntse dimming (xws li Zigbee/Wi-Fi dimming) kom tsis txhob muaj teeb meem thyristor.
(3) Ntxiv lub dummy load (ib ntus kev daws teeb meem nkaus xwb)
Txuas lub load resistive nyob rau hauv parallel (xws li 3W cement resistor) txhawm rau ua kom tag nrho cov tam sim no los tswj cov kev coj ua ntawm thyristor (tab sis txo lub zog efficiency, tsis pom zoo rau kev siv sijhawm ntev -).
Kev sib piv: Vim li cas PWM dimming tsis muaj qhov teeb meem no?
PWM dimming kho lub luag haujlwm lub voj voog ntawm qhov ci los ntawm kev hloov pauv sai ntawm LED (xws li saum toj 1000Hz) es tsis txhob txiav AC waveform.
Tam sim no ib txwm dhau ntawm qhov puv puv, thiab tsis muaj teeb meem ntawm kev saib xyuas tsis txaus, yog li 1% -100% flicker-free dimming tuaj yeem ua tiav.
Qhov qis -brightness flicker ntawm thyristor dimming yog qhov tseem ceeb ntawm qhov tsis sib xws ntawm "incandescent teeb era technology" thiab "LED yam ntxwv". Yog tias yuav tsum muaj qhov dimming ruaj khov, nws raug nquahu kom maj mam tshem tawm cov tshuaj thyristor thiab tig mus rau PWM lossis ntse dimming (DALI) system.
