Nguva dzese patinotaura nevatengi, shoko rimwe chete rinotaurwa kakawanda: garandi. Mutengi wega wega anoda nguva yakasiyana yegarandi, kubva pamakore maviri kusvika matatu, uye vamwe vanoda makore mashanu.
Asi kutaura chokwadi, kazhinji, vatengi pachavo vangasaziva kuti nguva iyi yewarandi inowanikwa kupi, kana kuti vanongotevera vanhu vakawanda vachifunga kuti ma LED anofanira kuvimbiswa kwenguva yakareba kudaro.
Nhasi, ndichakutorai munyika ye LED kuti muone kuti hupenyu hwemwenje hunotsanangurwa uye hunotongwa sei.
Chekutanga, kana zvasvika kuma LED, maererano nechitarisiko, tinogona kuona nekukasira kuti akasiyana nechiedza chekare, nekuti anenge ma LED ese ane chinhu chakasiyana -sinki yekupisa.
Madhishi akasiyana-siyana ekupisa haasi ekunaka kwemarambi e LED, asi kuti ma LED ashande zviri nani.
Ipapo vatengi vachashamisika kuti sei matsime emwenje ekare aisawanzoshandisa ma radiator, asi munguva ye LED mwenje inenge yese yaishandisa ma radiator?
Nekuti matsime ekare echiedza aivimba nemwaranzi yekupisa kuti ibudise chiedza, senge marambi etungsten filament, ayo anovimba nekupisa kuti abudise chiedza, saka haatyi kupisa. Chimiro chikuru che LED i semiconductor PN junction. Kana tembiricha yakakwira zvishoma, mashandiro ekushanda achaderera, saka kupisa kwakakosha zvikuru kune LED.
Kutanga, ngatitarisei kuumbwa uye dhayagiramu ye LED
Mazano: Chip ye LED ichaburitsa kupisa painoshanda. Tinotaura nezvekupisa kwenzvimbo yayo yemukati yePN sekupisa kwenzvimbo yekupinda (Tj).
Uye, chinonyanya kukosha, hupenyu hwemwenje dze LED hwakabatana zvakanyanya nekupisa kwejunction.
Pfungwa yatinofanira kunzwisisa: Patinotaura nezvehupenyu hwe LED, hazvirevi kuti haichashandiswi zvachose, asi kana chiedza che LED chasvika 70%, tinowanzo funga kuti 'hupenyu hwayo hwapera'.
Sezvatinoona kubva pamufananidzo uri pamusoro apa, kana tembiricha yejoinhi ikadzorwa pa105°C, kuyerera kwechiedza cherambi re LED kuchaderera kusvika pa70% kana rambi re LED rikashandiswa kwemaawa angangoita 10,000; uye kana tembiricha yejoinhi ikadzorwa pa60°C, nguva yaro yekushanda ichave maawa angangoita 100,000 + awa, kuyerera kwechiedza kuchaderera kusvika pa70%. Hupenyu hwerambi hunowedzerwa kagumi.
Muhupenyu hwezuva nezuva, chatinowanzo sangana nacho ndechekuti hupenyu hwema LED hunosvika maawa zviuru makumi mashanu, izvo zvinoreva kana tembiricha yemagetsi ichidzorwa pa85°C.
Sezvo tembiricha yejunction ichikosha zvikuru muhupenyu hwemwenje ye LED, ungaderedza sei tembiricha yejunction? Usazvidya moyo, ngatitangei tatarisa kuti rambi rinobvisa sei kupisa. Mushure mekunzwisisa nzira yekubvisa kupisa, unozoziva nzira yekuderedza tembiricha yejunction.
Mwenje inobvisa sei kupisa?
Kutanga, unofanira kuziva nzira nhatu huru dzekufambisa kupisa: conduction, convection, uye radiation.
Nzira huru dzekutumira kweradiator ndeyekuburitsa kupisa kwemhepo ne convection, uye kupisa kwemwaranzi pasi pe convection yechisikigo.
Nheyo huru dzekutamisa kupisa:
Kutungamira: Mafambiro anoita kupisa pachinhu kubva pachikamu chinodziya kuenda pachikamu chinotonhora.
Ndezvipi zvinhu zvinokanganisa kufambiswa kwekupisa?
① Kupisa kwezvinhu zvinopisa
② Kudzivirira kupisa kunokonzerwa nechimiro chekuparadza kupisa
③ Chimiro nehukuru hwezvinhu zvinofambisa kupisa
Mwaranzi: Chiitiko chezvinhu zvinopisa zvakanyanya zvinopisa zvakananga kunze.
Ndezvipi zvinhu zvinokanganisa mwaranzi yekupisa?
① Kudzivirira kupisa kwenzvimbo yakapoteredza uye yepakati (zvikuru tichifunga nezvemhepo)
② Hunhu hwemwaranzi yekupisa pachayo (kazhinji mavara matema anopenya nesimba, asi kutaura chokwadi kutamiswa kwemwaranzi hakuna kukosha zvakanyanya, nekuti tembiricha yerambi haina kukwira zvakanyanya uye mwaranzi haina kusimba zvakanyanya)
Kutenderera kwemhepo: Nzira yekufambisa kupisa kuburikidza nekuyerera kwegasi kana mvura.
Ndezvipi zvinhu zvinokanganisa kutenderera kwekupisa?
① Kuyerera kwegasi uye kumhanya kwaro
② Kugona kupisa kwakaringana, kumhanya kwekuyerera uye huwandu hwemvura
Mumarambi e LED, sinki yekupisa ndiyo inonyanya kukosha kwemurambi. Saka, maererano nechimiro cheradiator, kana zvinhu nedhizaini zvisina kukwana, rambi racho richava nematambudziko akawanda mushure mekutengesa.
Zvisinei, kutaura chokwadi, izvi zvinongova chiratidzo, uye ikozvino ndiyo pfungwa huru.
Semutengi, ungatonga sei kana kupisa kwerambi kwakanaka kana kuti kwete?
Nzira yehunyanzvi ndeyekushandisa michina yehunyanzvi kuita bvunzo yekupisa kwejunction.
Zvisinei, michina yakadaro yehunyanzvi inogona kunge isinganyanyi kukosha kuvanhuwo zvavo, saka chasara chete kushandisa nzira yechinyakare yekubata rambi kuti tinzwe tembiricha.
Ipapo mubvunzo mutsva unomuka. Zviri nani here kunzwa kupisa kana kusanzwa?
Kana radiator ichipisa paunoibata, hazvina kunaka zvachose.
Kana radiator ichipisa kana uchiibata, sisitimu yekutonhodza inofanira kunge yakaipa. Kana radiator isina simba rakakwana rekudzima kupisa uye kupisa kwechip hakugone kudzima nekufamba kwenguva; kana kuti nzvimbo inoshanda yekudzima kupisa haina kukwana, uye pane kushomeka mukugadzirwa kwechivako.
Kunyangwe kana rambi racho risingapisi kana richibatwa, harisi rakanaka nguva dzose.
Kana rambi re LED richishanda nemazvo, radiator yakanaka inofanira kunge iine tembiricha yakaderera, asi radiator inotonhorera haisiyo yakanaka hazvo.
Chip yacho haibudisi kupisa kwakawanda, inofambisa zvakanaka, inobvisa kupisa kwakakwana, uye hainzwi kupisa zvakanyanya muruoko. Iyi sisitimu yakanaka yekutonhodza, "chakaipa" chega ndechekuti inongotambisa zvinhu.
Kana paine tsvina pasi pe substrate uye pasina kubatana kwakanaka nesinki yekupisa, kupisa hakuzoburitswe kunze uye kuchaungana pachip. Hachipisi kana ukachibata kunze, asi chip iri mukati inenge yatopisa zvakanyanya.
Pano, ndinoda kukurudzira nzira inobatsira - "nzira yekuvhenekesa kwehafu yeawa" yekuona kana kupisa kwakanaka.
Cherechedza: "Nzira yekuvhenekesa hafu yeawa" inobva munyaya yacho
Nzira yekuvhenekesa kwehafu yeawa:Sezvatakambotaura, kazhinji kana tembiricha ye LED junction ichiwedzera, kuyerera kwe luminous kuchaderera. Zvadaro, chero bedzi tichiyera shanduko mukupenya kwerambi richipenya panzvimbo imwe chete, tinogona kufungidzira shanduko yetembiricha ye junction.
Kutanga, sarudza nzvimbo isingakanganiswe nechiedza chekunze wobva wabatidza rambi.
Mushure mekubatidza, tora mita yechiedza woiyera, semuenzaniso 1000 lx.
Chengeta nzvimbo yerambi nemita yekuvheneka zvisina kuchinja. Mushure mehafu yeawa, shandisa mita yekuvheneka kuti uedze zvakare. 500 lx zvinoreva kuti kupenya kwechiedza kwaderera ne50%. Kunopisa zvakanyanya mukati. Kana ukabatwa nekunze, kuchiri kushanda zvakanaka. Zvinoreva kuti kupisa hakusati kwabuda. Musiyano.
Kana kukosha kwakayerwa kuri 900 lx uye chiedza chikangodzikira ne10% chete, zvinoreva kuti idata rakajairika uye kupisa kwakanaka kwazvo.
Mashandisirwo e "nzira yekuvhenekesa yehafu yeawa": Tinonyora "luminous flux VS junction temperature" curve yekuchinja kwemachipisi anoshandiswa kakawanda. Kubva pacurve iyi, tinogona kuona kuti luminous flux yadzikira mangani, uye tinogona kuziva zvisina kunanga kuti tembiricha yejunction yakwira kusvika kumadhigirii Celsius mangani.
Koramu yekutanga:
Pachipu cheOSRAM S5 (30 30), kuyerera kwechiedza kwakaderera ne20% zvichienzaniswa ne25°C, uye tembiricha yejunction yadarika 120°C.
Koramu yechipirio:
Pachipu cheOSRAM S8 (50 50), kuyerera kwechiedza kwakaderera ne20% zvichienzaniswa ne25°C, uye tembiricha yejunction yadarika 120°C.
Chikamu chechitatu:
Pachipu cheOSRAM E5 (56 30), kuyerera kwechiedza kwakaderera ne20% zvichienzaniswa ne25°C, uye tembiricha yejunction yadarika 140°C.
Koramu yechina:
Kune OSLOM SSL 90 white chip, luminous flux yakaderera ne15% pane iyo iri pa25°C, uye tembiricha yejunction yadarika 120°C.
Koramu yechishanu:
Chip yeLuminus Sensus Serise, kuyerera kwechiedza kwakaderera ne15% zvichienzaniswa ne25℃, uye tembiricha yejunction yadarika 105℃.
Sezvatinoona kubva pamifananidzo iri pamusoro apa, kana chiedza chiri mukupisa chikadzikira ne20% mushure mehafu yeawa zvichienzaniswa nechando, tembiricha yekubatanidza inenge yadarika chiyero chechip. Zvinogona kutongerwa kuti sisitimu yekutonhodza haina kukodzera.
Ehe, iyi ndiyo yakawanda yenyaya, uye zvese zvine musiyano, sezvakaratidzwa mumufananidzo:
Ehe, kune akawanda ma LED, tinogona kushandisa nzira yekuvhenekesa kwehafu yeawa kuti tione kana yakanaka kana kwete mukati mekudonha kwe20%.
Wadzidza here? Paunosarudza marambi mune ramangwana, unofanira kungwarira. Haungogoni kungotarisa chitarisiko chemarambi, asi shandisa maziso ako akapinza kusarudza marambi.
Nguva yekutumira: Chivabvu-24-2024
