Tag Nrho Harmonic Distortion (THD) yog ib qho kev sib raug zoo-ntau zaus uas yuav pab txheeb xyuas qhov uas lub kaw lus tso tawm cov ntawv luam tawm. . Nws yog ib qho kev ntsuas ntawm harmonic distortion tam sim no nyob rau hauv lub teeb liab thiab txhais tau tias yog qhov piv ntawm cov sum ntawm lub hwj chim ntawm tag nrho cov harmonic Cheebtsam rau lub hwj chim ntawm lub hauv paus zaus. Qhov no yuav cuam tshuam rau cov khoom siv hluav taws xob nkaus xwb thiab lawv tsuas yog cov khoom siv uas tsim txhua yam zaus. Qhov qis dua tus nqi THD, lub suab nrov tsawg lossis distortion ntawm qhov system tso zis.
Rau txhua qhov kev xeem zaus, tus nqi ntawm THD yog nyob nruab nrab ntawm 0 thiab 1:
ZERO - Tus nqi ze rau xoom txhais tau hais tias cov zis muaj qhov tsis sib haum xeeb tsawg. Cov zis sine yoj muaj cov zaus feem ntau zoo ib yam li cov tswv yim.
IB - Tus nqi ze rau 1 txhais tau hais tias muaj kev sib haum xeeb ntau hauv lub teeb liab. Yuav luag tag nrho cov ntsiab lus zaus hauv lub teeb liab txawv ntawm qhov zaus ntawm lub teeb liab input.
THD kuj tuaj yeem qhia tau tias yog feem pua, ntawm 0 mus rau 100 feem pua, qhov twg 100 feem pua rau 1.
Hauv ntau daim ntawv thov, qis THD yog xav tau. Tsawg THD txhais tau hais tias qhov tso tawm qhov system zoo ib yam li cov lus nkag hauv lub cev nrog qhov cuam tshuam tsawg.
Vim li cas nws thiaj tseem ceeb?
Ua ntej, raws li ib tug txhais, harmonics yog voltages los yog tam sim no zaus uas nws zaus yog ib tug ntau yam ntawm lub hauv paus zaus, thiab Australia yog 50 Hz: 100, 150, 200 Hz, thiab lwm yam. Tag nrho Harmonic Distortion (THD) yog cov sum ntawm tag nrho cov harmonic Cheebtsam rau qhov tseem ceeb zaus tam sim no nyob rau hauv nonlinear hluav taws xob thiab cov khoom siv hluav taws xob.
LED tsav tsheb yog cov khoom siv hluav taws xob hauv hluav taws xob hauv LED luminaires uas muaj cov khoom siv inductive (reactance thiab capacitive Cheebtsam). Lawv yog cov tsis-linear li vim hais tias lawv hloov cov waveform ntawm tam sim no kos los ntawm cov khoom siv hluav taws xob hluav taws xob thiab zoo li tsis tshua muaj sinusoidal.
Feem ntau cov tsav tsheb LED kuj suav nrog tus choj diode rau kev kho cov teeb liab AC input kom khiav DC LED module. Kev hloov pauv ntawm cov txuas txuas diode no ua rau tsis tu ncua tam sim no uas nws thiaj li cuam tshuam cov sine yoj.
Yog li ntawd, thaum tus tsav tsheb LED txuas nrog lub zog tseem ceeb, nws tsim cov kev sib haum xeeb uas cuam tshuam cov khoom siv hluav taws xob. Thiab cov luminaires ntau dua (nrog rau cov tsav tsheb uas tsis yog-linear LED) hauv Circuit Court, qhov cuam tshuam ntau dua rau lub zog faib hluav taws xob, ua rau nws tsis muaj txiaj ntsig, cuam tshuam rau kev ua haujlwm ntawm lwm yam khoom siv thiab overheating cov xov hlau.
Qhov no yog qhov tseem ceeb vim li cas cov hluav taws xob tshwj xeeb ntawm cov khoom siv teeb pom kev zoo hauv kev teeb tsa tshiab feem ntau xav kom qhov siab tshaj plaws THD ntawm lub luminaire tsawg dua 15 feem pua.
