Ko e Faingataʻa Fufuuʻi ʻi he Ngaahi Polokalama ʻUhila ʻo Onoponi
ʻI ha mamani lelei, ʻe hoko ʻa e ʻuhila ʻoku tafe mai ʻi heʻetau ngaahi netiueka ʻuhila ko ha peau sine haohaoa mo maʻa—ko ha oscillation ʻo e voltage mo e current. Neongo ia, ko e moʻoni ʻo e ngaahi polokalama fakaʻuhila ʻo onopooni, ʻa ia ʻoku fonu ʻi he ngaahi meʻangaue fakaʻilekitulonika, ʻoku mamaʻo ia mei he fakakaukau ko ʻeni. Ko e taimi kotoa pe ʻoku ke palaki ai ha device ʻoku ʻi ai ha switch mode power supply—mei hoʻo laptop charger ki ha foʻi ʻuhila LED—ʻoku ne fakakeheʻi ʻa e waveform haohaoa ko ʻeni. ʻOku quantified ʻa e distortion ko ʻeni ʻe ha parameter mahuʻinga ʻoku ʻiloa ko e Total Harmonic Distortion, pe THD. Neongo ʻe ongo hange ha foʻi fakakaukau fakatekinikale maʻa e kau ʻenisinia fakaʻuhila, ka ʻoku mahuʻinga ke mahino ʻa e ngaahi tefitoʻi meʻa mahuʻinga ʻo e THD ki ha taha pe ʻoku kau ʻi hono fakamahinoʻi, fokotuʻu, pe tokangaʻi ʻo e ngaahi maama lalahi. ʻE lava ke iku ʻa e ngaahi tuʻunga maʻolunga ʻo e feliliuaki ʻo e harmonic ki he overheat transformers, tripped circuit breakers, malfunctioning equipment, mo e lahi ʻo e ivi ʻoku ʻikai lava. Ki he ngaahi pisinisi mo e ngaahi kolo ʻoku nau ʻinivesi ʻi he maama LED koeʻuhi ko hono malava ke fakahaofi ʻa e ivi, ʻe lava ke fakavaivaiʻi ʻe hono tukunoaʻi ʻo e THD ʻa e fakahu paʻanga ʻoku nau ʻamanaki ke aʻusia. ʻE fakamatalaʻi ʻe he fakahinohino ko ʻeni ʻa e THD, ʻo fakamatalaʻi pe ko e ha ia, founga hono fuatautau, ʻuhinga ʻoku faʻu ai ia ʻe he LED drivers, pea mo e ʻuhinga ʻoku ʻikai lava ke aleaʻi ai hono tauhi ia ke maʻulalo ki ha fola ʻuhila ʻoku malu mo lelei.
Ko e ha ʻa e Total Harmonic Distortion (THD)? Ko ha Fakaʻuhinga Faingofua
Ko e Total Harmonic Distortion (THD) ko ha meʻafua ia ʻoku ne quantifies ʻa e lahi ʻo e mioʻi ʻoku ʻi ha fakaʻilonga, tautautefito ki he tukunga ʻo e ngaahi polokalama malohi, ʻa e mioʻi ʻo e lolotonga pe voltage waveform mei hono fotunga lelei mo haohaoa ʻo e peau sinu. Ke mahino ʻeni, kuo pau ke tomuʻa mahino kiate kitautolu ʻa e foʻi fakakaukau ʻo e harmonics. Ko e tefitoʻi tuʻo lahi ʻo ha polokalama ʻuhila ko hono tuʻo lahi ʻo e ngaue — 50 Hz ʻi he ngaahi feituʻu lahi ʻo e mamani (kau ai ʻa ʻIulope, ʻEsia mo ʻAositelelia) pe 60 Hz ʻi ʻAmelika Tokelau. Ko e harmonics ko e voltages pe currents ʻi he frequency ʻoku integer multiples ʻo e tefitoʻi tuʻo lahi ko ʻeni. Ki ha polokalama 50 Hz, ko e harmonic hono 3 ko e 150 Hz, ko e 5 ko e 250 Hz, ko e 7 ko e 350 Hz, mo e ala meʻa pehee. Ko e THD ko e fakakatoa ia ʻo e malohi (pe lahi) ʻo e ngaahi konga harmonic kotoa ko ʻeni, ʻi hono fakafehoanaki ki he malohi ʻo e tefitoʻi tuʻo lahi. Ko ha meʻafua ia ʻo e lahi ʻo e "longoaʻa" pe ivi ʻoku ʻikai fie maʻu kuo tanaki atu ki he tefitoʻi fakaʻilonga maʻa. ʻOku faʻa fakahaaʻi ia ko ha ratio ʻi he vahaʻa ʻo e 0 mo e 1 pe ko ha peseti mei he 0% ki he 100%. ʻOku fakafofongaʻi ʻe he THD ʻo e 0% (pe 0) ha peau sine haohaoa ʻoku ʻikai fakakeheʻi. ʻOku ʻuhinga ʻa e THD ʻo e 100% (pe 1) ʻoku tatau ʻa e malohi fakakatoa ʻi he harmonics mo e malohi ʻi he tefitoʻi meʻa, ʻo fakahaaʻi ai ha waveform ʻoku fuʻu mioʻi. ʻI hono fakaʻaongaʻi, ko e maʻulalo ange ʻa e mahuʻinga ʻo e THD, ko e maʻa mo lelei ange ia ʻa e malohi.
ʻOku fikaʻi mo fakaʻuhingaʻi fefe ʻa e THD?
ʻOku kau ʻi hono fikaʻi ʻo e THD ʻa e ʻanalaiso ʻo e fakaʻilonga, ka ʻoku fakahangatonu ʻa e tefitoʻi moʻoni. ʻOku fua ʻe he analyzer ʻo e tuʻunga lelei ʻo e malohi ʻa e fakaʻilonga ʻuhila pea fakahoko ha ngaue fakafika ʻoku ui ko e Fast Fourier Transform (FFT). ʻOku veteki ʻe he meʻa ni ʻa e waveform faingataʻa mo mioʻi ki hono ngaahi konga tuʻo lahi fakafoʻituitui. ʻOku ne fakamahinoʻi ʻa e lahi ʻo e tuʻo lahi mahuʻinga (e.g., 50 Hz) mo e lahi ʻo e ngaahi tuʻo lahi kotoa pe (e.g., 100 Hz, 150 Hz, 200 Hz, etc.). ʻOku fikaʻi leva ʻa e THD ʻaki hono toʻo ʻa e aka sikuea ʻo e fakakatoa ʻo e ngaahi tapafa ʻo e lahi ʻo e harmonic kotoa pe, vahevahe ʻaki ʻa e lahi ʻo e tefitoʻi meʻa. ʻOku liunga lahi leva ʻa e ola ʻaki ʻa e 100 ke maʻu ha peseti ʻe taha. Ko hono fakaʻuhingaʻi ʻo e tuʻunga ʻulungaanga mahuʻinga ko ʻeni ko e ki ia ki hono fakafuofuaʻi ʻo e tuʻunga lelei ʻo e ʻOku ʻuhinga ʻa e tuʻunga ʻulungaanga mahuʻinga ʻo e THD ofi ki he 0% ko e output current pe voltage ko ha peau sine maʻa ʻaupito, mo e ngaahi konga ʻo e tuʻo lahi ʻoku meimei tatau mo e input. ʻOku lelei ʻeni. ʻOku ʻuhinga ʻa e mahuʻinga ʻoku ofi ki he 100% ʻoku ʻi ai ha lahi ʻo e mioʻi ʻo e harmonic; ʻOku fakaʻuliʻi ʻa e fakaʻilonga ʻaki ʻa e ngaahi tuʻunga maʻolunga ʻo e ngaahi tuʻunga kehe. Hange ko ʻeni, ʻoku ʻuhinga ʻa e THD ʻo e 15% ko e ivi fakakatoa ʻoku ʻi he ngaahi tuʻo lahi kotoa pe ʻoku fakatahaʻi ko e 15% ʻo e ivi ʻoku ʻi he tefitoʻi meʻa. ʻOku faʻa fokotuʻu ʻa e tuʻunga ko ʻeni ʻo e mioʻi ko ha fakangatangata lahi taha ʻoku fakangofua ki he ngaahi meʻangaue fakafoʻituitui, he ʻe lava ke kamata ke fakatupu ʻe he ngaahi tuʻunga maʻolunga ange ʻa e ngaahi palopalema ʻi he netiueka fakaʻuhila fakalukufua.
Ko e ha ʻoku fakatupu ai ʻe he LED drivers ʻa e feliliuaki ʻo e harmonic?
Ko e tefitoʻi maʻuʻanga tokoni ʻo e mioʻi ʻo e harmonic ʻi he ngaahi maama fakaonopooni ko e LED driver. Ko e fakaʻuli LED ko ha maʻuʻanga ʻuhila fakaʻilekitulonika ia ʻoku ne liliu ʻa e AC (alternating current) ki he malohi DC (direct current) ʻoku fie maʻu ʻe he LED modules. Ko e konga lahi ʻo e ngaahi fakaʻuli ko ʻeni ko e ngaahi kavenga ʻoku ʻikai linear. ʻOku ʻikai hange ia ko ha foʻi ʻuhila incandescent faingofua, ʻa ia ko ha kavenga laine ʻoku ne tohoakiʻi ha ʻau ʻoku molemole, sinusoidal, ʻoku ʻikai ke tohoakiʻi hokohoko ʻe he fakaʻuli LED ʻa e lolotonga ʻi he siakale ʻo e AC. ʻI loto, ko e ʻuluaki sitepu ʻo ha fakaʻuli LED angamaheni ko ha rectifier, meimei ko ha hala fakakavakava diode maʻu pe. ʻOku liliu ʻe he circuit ko ʻeni ʻa e peau ʻo e AC ki ha pulsating DC. ʻOku tataki pe ʻe he diodes ʻi he hala fakakavakava ko ʻeni ʻa e lolotonga ʻi he taimi ʻoku laka hake ai ʻa e voltage ʻi ha tuʻunga pau, ʻa ia ʻoku hoko pe ofi ki he tumutumu ʻo e peau sine AC. ʻOku iku ʻeni ki hono tohoakiʻi ʻe he fakaʻuli ʻa e ʻau ʻi ha ngaahi pulses nounou mo maʻolunga kae ʻikai ko ha peau molemole mo hokohoko. ʻOku koloaʻia ʻa e pulsed current ko ʻeni ʻi he ngaahi tuʻo lahi ʻo e harmonic. ʻOku hanga ʻe he ngaue ʻa e diodes, fakataha mo e feliliuaki tuʻo lahi ʻo e circuitry fakaului ʻo e malohi ʻo e fakaʻuli, ʻo tuʻusi lelei ʻa e waveform lolotonga, ʻo fakafoki mai ʻa e ngaahi ʻau harmonic ko ʻeni ki he maʻuʻanga ʻuhila. Ko e lahi ange ʻa e kavenga ʻoku ʻikai ke laine, pea ko e kovi ange ia hono fokotuʻutuʻu ʻo e maʻuʻanga ʻuhila, ko e lahi ange ia ʻa e mioʻi ʻo e waveform lolotonga, pea ko e maʻolunga ange ia ʻa e THD.
Ko e ha ʻoku hoko ʻi loto ʻi ha LED driver ke faʻu ʻaki ʻa e harmonics?
Ke fakakaukauloto atu ki he meʻa ni, fakakaukau ki he voltage ʻo e AC ko ha foʻi tafungofunga ʻoku ngaʻunu mamalie. ʻE hanga ʻe ha kavenga laine hange ko ha meʻa fakamafana ʻo tohoakiʻi lelei ʻa e ʻau ʻo aʻu ki ʻolunga mo hifo ʻi he tafungofunga ko ia. Ka neongo ia, ʻoku hange ʻa e fakaʻuli LED ʻoku ʻikai laine ko ha tokotaha lue lalo ʻoku ne laka vave mo mamafa ʻi he tumutumu ʻo e tafungofunga. ʻOku tataki pe ʻe he diode bridge rectifier ʻi he taimi ʻoku maʻolunga ange ai ʻa e voltage AC ʻi he voltage ʻoku tauhi ʻi he input capacitors ʻa e fakaʻuli. ʻOku hoko ʻeni ʻi ha vahaʻa taimi nounou ʻi he tumutumu lelei mo kovi ʻo e peau sinu. Ko hono ola ko ha waveform lolotonga ʻoku ʻi ai ha ngaahi pulses fasiʻi mo spiky kae ʻikai ko ha piko molemole mo falahi. Ko e ngaahi pulses masila mo discontinuous ko ʻeni, ʻi he tuʻo lahi, ʻoku faʻu ʻaki ha ngaahi harmonics lahi. ʻE lava ke malohi ʻa e konga mahuʻinga ʻo e 50 Hz, ka ʻe toe ʻi ai foki mo ha ivi mahuʻinga ʻi he 150 Hz (3rd harmonic), 250 Hz (5th harmonic), 350 Hz (7th harmonic), mo e ala meʻa pehee. ʻOku tafe mai ʻa e ngaahi ʻau harmonic ko ʻeni mei he fakaʻuli ki he uaea ʻo e fale pea ki tuʻa ki he transformer ʻo e ʻuhila. ʻOku ʻikai ke nau tokoni ki hono fai ʻo e ngaue ʻaonga; ka ʻoku nau fakafofongaʻi ʻa e ivi maumauʻi ʻoku feʻaveʻaki holo ʻi he sisitemi ʻuhila, ʻo fakatupu ai ʻa e vela mo e fakahohaʻasi.
Ko e ha ʻoku fuʻu mahuʻinga ai ʻa e fakaʻaongaʻi fakakatoa ʻo e harmonic ʻi hono fokotuʻu ʻo e mama?
ʻOku tupu ʻa e mahuʻinga ʻo e THD mei he ngaahi nunuʻa fakakatoa mo maumau ʻoku maʻu ʻe he ʻau ʻo e harmonic ʻi ha fola fakaʻuhila kakato. ʻE lava ke ʻi ai ha ola siʻisiʻi ʻo ha fakaʻuli LED ʻe taha ʻoku maʻolunga ʻa e THD. Neongo ia, ʻi ha fale fakaonopooni, ʻe lava ke laungeau pe lauiafe ʻa e ngaahi fakaʻuli ko ʻeni—ʻi he ngaahi maama LED, komipiuta, monitoa, mo e ngaahi meʻangaue taʻefaʻalaua kehe. ʻOku tanaki ʻa e ngaahi ʻau ʻo e harmonic mei he ngaahi kavenga ʻoku ʻikai ko ʻeni ʻi he ngaahi conductors ʻoku ʻikai kau ki ai mo e transformers tufakiʻanga. ʻOku iku ʻa e fakatahatahaʻi ko ʻeni ki ha ngaahi nunuʻa kovi. Ko e vave taha ko e vela. ʻOku ʻikai ke kaniseli ʻa e harmonic currents, tautautefito ki he 3rd harmonic mo hono multiples (ʻoku ui ko e "triplen" harmonics), ʻi he uaea ʻoku ʻikai kau ki ai ʻo hange ko ia ʻoku fai ʻe he ngaahi tefitoʻi ʻau. Ka ʻoku nau tanaki atu, ʻo fakatupu ai ʻa e conductor ʻoku ʻikai kau ki ai ke ʻi ai ha ʻau lahi neongo ʻoku potupotutatau lelei ʻa e ngaahi konga ʻo e vaʻinga. ʻE lava ke iku ʻeni ki he vela lahi, ko ha fakatuʻutamaki lahi ia ki he vela. ʻOku toe fokotuʻutuʻu foki ʻa e transformers ke ne tokangaʻi ʻa e malohi ʻi he tefitoʻi tuʻo lahi; ʻOku fakatupu ʻe he ngaahi ʻau ʻo e harmonic ʻa e lahi ange ʻo e mole ʻo e ʻeddy mo e mole ʻo e hysteresis ʻi honau ngaahi uho ʻo e magnet, ʻo iku ki he overheating, siʻisiʻi ʻa e lavameʻa, mo ha fakanounou ʻo e moʻui. ʻE lava foki ke uesia ʻa e circuit breakers mo e fuse, he ʻoku ʻikai ke nau ngaue totonu ʻi he taimi ʻoku ʻave ai ʻa e ʻau ʻoku ʻikai sinusoidal, ʻo uesia ai ʻa e malu.
ʻOku uesia fefe ʻe he THD maʻolunga ʻa e lelei ʻo e polokalama ʻuhila mo e ngaahi meʻangaue kehe?
Makehe mei he ngaahi fakatuʻutamaki fakatuʻasino ʻo e overheating, ʻoku holoki ʻe he THD maʻolunga ʻa e lavameʻa fakalukufua ʻo ha polokalama ʻuhila. ʻOku fakafofongaʻi ʻe he ngaahi ʻau ʻo e harmonic ʻa e ivi kuo maumauʻi—ʻoku ʻikai ke nau fai ha ngaue ʻaonga ka ʻoku kei faʻu, ʻave mo fakamoleki ko e vela ʻi he transformers, uaea, mo e ngaahi meʻangaue kehe. ʻOku fakalahi ʻe he meʻa ni ʻa e fakakatoa ʻo e ʻuhila ʻoku maʻu mei he ʻuhila, ʻo iku ki he maʻolunga ange ʻa e moʻua ʻuhila, tautautefito ki he kau fakatau fakakomesiale mo e ngaahi ngaueʻanga ʻa ia ʻe ala moʻua ki ai ʻa e ngaahi tautea ki he maʻulalo ʻa e ʻuhila, ʻa ia ʻoku fekauʻaki vaofi mo e fehalaaki ʻo e harmonic. ʻOku toe uesia foki ʻe he mioʻi ʻa e ngaue totonu ʻa e ngaahi meʻangaue fakaʻilekitulonika pelepelengesi kehe ʻoku fehokotaki ki he netiueka ʻuhila tatau. ʻE lava ke fakatupu ʻe he voltage distortion, ʻa ia ʻoku fakatupu ʻe he harmonic currents ʻoku tafe mai ʻi he impedance ʻo e polokalama, ʻa e ngaahi feituʻu ʻoku kolosi ai ʻa e voltage sine wave ke liliu pe longoaʻa. ʻOku fakaʻaongaʻi ʻe he ngaahi meʻangaue fakaʻilekitulonika lahi ʻa e ngaahi feituʻu ko ʻeni ki he taimi mo e mapuleʻi. ʻE lava ke fakatupunga ʻe ha voltage ʻoku mioʻi ke nau fehalaaki, ʻo iku ki he ʻulungaanga taʻefeʻunga ʻi he ngaahi komipiuta, meʻangaue fakafaitoʻo, mo e ngaahi founga puleʻi ʻo e ngaahi ngaueʻanga. Ko hono moʻoni, ʻoku hanga ʻe he THD maʻolunga ʻo ʻai ʻa e ʻatakai fakaʻuhila kotoa ke "longoaʻa" mo taʻefalalaʻanga, ʻo uesia ai ʻa e meʻa kotoa pe mei he mama ki he ngaahi meʻangaue ʻoku palaki ki he holisi ofi mai.
Ko e ha ʻa e tuʻunga lelei ʻo e THD ki he LED drivers mo e luminaires?
Koeʻuhi ko e ngaahi palopalema ʻoku fakatupu ʻe he THD maʻolunga, kuo ʻasi mai ʻa e ngaahi tuʻunga moʻui mo e ngaahi founga lelei taha ke fakaʻuhingaʻi ʻa e ngaahi fakangatangata ʻoku tali. Ki he ngaahi meʻangaue fakaonopooni ʻo e mama, ʻoku angamaheni ʻaki ʻeni ke fie maʻu ʻa e lahi taha ʻo e Total Harmonic Distortion ʻo ha LED pe fakaʻuli fakafoʻituitui ke siʻi hifo ʻi he 20%, pea ʻoku faʻa fokotuʻu ha taumuʻa fefeka ange ʻo siʻi hifo ʻi he 15% pe 10%. Ko ha THD ʻoku siʻi hifo ʻi he 15% ʻoku faʻa lau ia ko e lelei, ʻo fakahaaʻi ai ʻoku kau ʻi he palani ʻa e fakaʻuli ʻa e sivi harmonic lelei. ʻOku lelei ʻaupito ʻa e THD ʻi lalo ʻi he 10%. ʻOku ʻuhinga ʻeni ʻoku maʻu ʻe he fakaʻuli ha ʻau ʻoku maʻa ange mo sinusoidal ange, ʻo fakasiʻisiʻi ʻene uesia ʻa e grid ʻuhila. ʻI he taimi ʻoku palani ai ha retrofit lahi ʻo e LED pe ngaue langa foʻou, ʻoku mahuʻinga ke fakamahinoʻi ʻa e ngaahi maama ʻoku maʻulalo ʻa e THD. Neongo ʻoku kiʻi maʻolunga ange ʻenau fakamole kimuʻa ʻi he ngaahi meʻa kehe ʻoku maʻamaʻa mo maʻolunga ʻa e THD, ka ʻoku lahi ʻa e ngaahi lelei taimi loloa. ʻOku nau fakapapauʻi ʻoku ngaue lelei, malu mo falalaʻanga ʻa e polokalama fakaʻuhila fakalukufua, ʻo fakaʻehiʻehi mei he fakamole lahi ʻo e movete, fuʻu mafana ʻo e transformer, mo e ngaahi palopalema ʻe ala hoko ʻi he tuʻunga lelei ʻo e ʻuhila ʻa ia ʻe lava ke ne uesia ʻa e fale kotoa. Ko e ʻinivesi ʻi he ngaahi fakaʻuli LED maʻulalo THD ko ha ʻinivesi ia ʻi he moʻui lelei mo e longevity ʻo hoʻo faʻunga fakaʻuhila kotoa.
Ngaahi Tafaʻaki Mahuʻinga ʻo e Total Harmonic Distortion (THD)
ʻOku fakamatalaʻi fakanounou ʻe he tepile ko ʻeni ʻa e ngaahi tefitoʻi fakakaukau fekauʻaki mo e THD ʻi he tukunga ʻo e maama LED.
| Fakakaukau | Fakaʻuhinga / Fakamatala | Ola / Mahuʻinga ʻi he Maama |
|---|---|---|
| Tuʻo Lahi ʻo e Ngaahi Meʻa Mahuʻinga | Ko e tefitoʻi tuʻo lahi ʻo e polokalama ʻuhila (e.g., 50 Hz pe 60 Hz). | Ko e peau sine maʻa ʻoku fie maʻu ʻoku fakataumuʻa ʻa e meʻangaue ke fakaʻaongaʻi. |
| Harmonics | Voltages pe currents ʻi he integer multiples ʻo e tefitoʻi tuʻo lahi (e.g., 150 Hz, 250 Hz). | Faʻu ʻe he ngaahi kavenga ʻoku ʻikai linear hange ko e LED drivers; ʻoku nau fakafofongaʻi ʻa e fakamole ivi pea fakatupu ʻa e mioʻi. |
| Fakakatoa ʻo e Harmonic Distortion (THD) | Ko ha meʻafua ʻo e ivi fakakatoa ʻi he harmonics kotoa pe ʻi hono fakafehoanaki ki he tefitoʻi meʻa, ʻoku fakahaaʻi ko ha ratio pe peseti ʻo e vaʻinga. | Ko ha fakaʻilonga mahuʻinga ʻo e tuʻunga lelei ʻo e malohi. ʻOku ʻuhinga ʻa e THD maʻulalo ange ki he malohi maʻa mo siʻisiʻi ange ʻa e mafasia ʻi he sisitemi ʻuhila. |
| Kavenga ʻOku ʻikai Linear | Ko ha kavenga ʻoku ʻikai proportional ʻa e ʻau ki he voltage, ʻo tohoakiʻi ʻa e ʻau ʻi ha ngaahi pulses nounou. | Ko e ngaahi fakaʻuli LED ko e ngaahi uta angamaheni ʻoku ʻikai linear; ʻoku fakapapauʻi ʻe heʻenau palani ʻa e lahi ʻo e feliliuaki ʻoku nau fakatupu. |
| THD maʻulalo (e.g., <15%) | Fakahaaʻi ha fakaʻuli kuo fokotuʻutuʻu lelei mo e fakatonutonu lelei ʻo e malohi mo e sivi. | Siʻisiʻi ʻa e uesia ʻo e grid, fakasiʻisiʻi ʻa e overheating, maʻolunga ange ʻa e lavameʻa ʻo e polokalama, talangofua ki he ngaahi tuʻutuʻuni. |
| THD maʻolunga (e.g., >30%) | Fakahaaʻi ha fakaʻuli ʻoku ʻikai lelei hono fokotuʻutuʻu, totongi maʻamaʻa pea siʻisiʻi hono siviʻi. | ʻOku fuʻu vela ʻa e neutrals mo e transformers, movete ʻa e ivi, maumauʻi ʻa e ivi, fakahohaʻasi ʻa e ngaahi meʻangaue kehe. |
Ko hono fakaʻosi, ko e Total Harmonic Distortion ko ha tafaʻaki mahuʻinga ia ʻo e tuʻunga lelei ʻo e mama. Ko ha meʻafua ia ʻo e "longoaʻa fakaʻuhila" ʻoku huhu ki ha polokalama ʻuhila ʻe he ngaahi meʻangaue ʻoku ʻikai laine hange ko e LED drivers. Neongo ʻoku ʻikai lava ke taʻofi ha lahi ʻo e THD ʻi he ngaahi meʻa fakaʻilekitulonika ʻo onoponi, ʻoku fakatuʻutamaki ʻa e ngaahi tuʻunga maʻolunga ki he lavameʻa, malu mo e moʻui loloa ʻo e meʻangaue. Ki ha taha pe ʻoku ne fakamahinoʻi pe fokotuʻu ʻa e maama LED, ʻoku mahuʻinga ʻa e fakamuʻomuʻa ʻo e ngaahi maama mo e fakaʻuli ʻoku maʻulalo ʻa e THD—meimei siʻi hifo ʻi he 15%—ki hono fakapapauʻi ʻoku falalaʻanga, lelei mo malu ʻa e fola fakaʻuhila ʻoku ne fakahoko ʻa e talaʻofa kakato ʻo e tekinolosia LED.
Ngaahi Fehuʻi ʻOku Faʻa ʻEke Fekauʻaki mo e Fakakeheʻi Fakakatoa ʻo e Harmonic
Ko e ha ʻa e tuʻunga malu pe tali ʻo e THD ki ha maama LED?
Ki he lahi taha ʻo e ngaahi tuʻunga fakakomesiale mo fakangaueʻanga, ʻoku tali lelei ʻa e Total Harmonic Distortion (THD) ʻo siʻi hifo ʻi he 20%, lolotonga ia ʻoku fie maʻu ha THD ʻoku siʻi hifo ʻi he 15% pea ʻoku fakahaaʻi ai ha fakaʻuli tuʻunga maʻolunga. ʻOku aʻu ʻo aʻu ʻa e ngaahi koloa premium ʻe niʻihi ki he THD ʻi lalo ʻi he 10%. Ko e maʻulalo ange ʻa e THD, ko e siʻisiʻi ange ia ʻa e mafasia ʻi hoʻo sisitemi ʻuhila pea ko e lelei ange ia ʻa e tuʻunga lelei fakalukufua ʻo e malohi.
ʻE lava ke maumauʻi ʻe he THD maʻolunga ʻa e ngaahi meʻangaue kehe ʻi hoku fale?
ʻIo, ʻikai fakahangatonu. ʻE lava ke fakatupu ʻe he THD maʻolunga, tautautefito mei he lahi ʻo e ngaahi kavenga ʻoku ʻikai linear, ʻa e mioʻi lahi ʻo e voltage. ʻE lava ke uesia ʻe he waveform voltage ko ʻeni ʻa e taimi mo e ngaue ʻa e ngaahi meʻangaue fakaʻilekitulonika pelepelengesi kehe, hange ko e ngaahi komipiuta, ngaahi meʻangaue fakafaitoʻo, mo e programmable logic controllers (PLCs). Ka ko e tefitoʻi maumau ko e fuʻu vela ʻo e transformers, uaea tuʻu ʻi tuʻa, mo e motors.
ʻE anga fefe haʻaku fakasiʻisiʻi ʻa e THD ʻi heʻeku fokotuʻu ʻo e mama?
Ko e founga lelei taha ke fakasiʻisiʻi ʻaki ʻa e THD ʻoku ʻi he tupuʻanga: fili ʻa e LED drivers mo e luminaires naʻe fakataumuʻa pau ki he maʻulalo ʻo e harmonic distortion. Kumi ʻa e ngaahi koloa ʻoku siʻi hifo ʻi he 15% ʻa e tuʻunga pau ʻo e THD. ʻI he ngaahi fola lolotonga, ʻe lava ke fokotuʻu ha meʻa sivi harmonic, ka ʻoku faʻa faingataʻa mo mamafa ʻeni ʻi hono fakafehoanaki ki hono fili pe ʻo e ngaahi koloa ʻoku maʻulalo ʻa e THD mei he kamataʻanga.
