Zvikonzero zve LED's Heat Generation
Sezvinongoita magetsi emagetsi, semiconductor emitting diodes (LEDs) anogadzirawo kupisa panguva yekushanda, zvichienderana nekupenya kwese kwese. Pasi pekuita kwesimba remagetsi rinoshandiswa, mwaranzi wemaerekitironi nemakomba zvinosanganazve kugadzira electroluminescence, uye chiedza chinovhenekera pedyo nePN junction chinoda kupfuura nepakati semiconductor uye kurongedza svikiro rechip pachako kuti risvike kunze (mhepo). Yakakwana yazvino jekiseni kunyatsoshanda, radiation luminescence quantum kunyatsoita, chip yekunze mwenje kuburitsa kunyatsoita, nezvimwewo, yekupedzisira chete 30-40% yesimba rekuisa musimba rechiedza, uye yasara 60-70% yesimba rayo inowanzoitika mune isiri-. radiation yakaoma fomu yedot-matrix vibration inoshandura kupisa.
Kuwedzera kwekushisa kwe chip kunosimudzira iyo isiri-radiation yakaoma, ichiwedzera kunetesa kupenya kwakanaka. Nekuti vanhu subjectively vanofunga kuti yakakwirira simba LEDs haana kupisa, kutaura zvazviri, ivo. Kupisa kwakawanda kunokonzera nyore matambudziko akawanda panguva yekushandiswa. Mukuwedzera, vanhu vazhinji vanoshandisa ma LED emagetsi ekutanga kwekutanga uye havanzwisisi kuti vangagadzirisa sei matambudziko ekupisa, zvichiita kuti kuvimbika kwekugadzirwa kuve dambudziko guru. Saka heino mimwe mibvunzo ngatifungei nezvayo: Ma LED ane chero kupisa kunogadzirwa here? Inogona kubudisa kupisa kwakadini? Yakawanda sei kupisa iyo LED inogadzira?
Pasi pemagetsi ekumberi e LED, maerekitironi anowana simba kubva kune magetsi. Pasi pekufambisa kwemagetsi emagetsi, nzvimbo yemagetsi yePN junction inokundwa, uye kuchinja kubva munharaunda yeN kusvika kuP nzvimbo inoitika. Maerekitironi aya anosanganazve nemaburi ari mudunhu reP. Sezvo maerekitironi akasununguka ari kukukurwa achipinda mudunhu reP aine simba rakakwirira kudarika maerekitironi evalence ari munharaunda yeP, maerekitironi anodzokera kune yakaderera simba panguva yekubatanidzwazve, uye simba rakawandisa rinoburitswa nenzira yemafotoni. Iyo wavelength yeiyo emitted photon inoenderana nemusiyano wesimba Eg. Zvinogona kuonekwa kuti nzvimbo yechiedza-emitting inonyanya pedyo nePN junction, uye kubuda kwechiedza ndicho chikonzero chesimba rinobudiswa nekubatanidzwazve kwema electrons nemakomba. Mune semiconductor diode, maerekitironi achasangana nekupikiswa mukati merwendo rwese kubva ku semiconductor zone kuenda ku semiconductor zone. Zviri nyore kubva pamusimboti, chimiro chemuviri cheiyo semiconductor diode inongobva kumusimboti, nhamba yemaerekitironi inoburitswa kubva kune yakaipa electrode uye maerekitironi akadzokera kune yakanaka electrode yesemiconductor diode yakaenzana. Madhiodhi akajairwa, kana electron-gomba pair recombination ikaitika, nekuda kwechikonzero chekusiyana kwesimba remagetsi Eg, iyo yakaburitswa photon spectrum haisi muchikamu chinooneka.
Panzira mukati me diode, maerekitironi anoshandisa simba nekuda kwekuvapo kwekupikisa. Simba rinodyiwa rinoenderana nemirairo yekutanga yemagetsi:
P = I2 R = I2 (RN + + RP) + IVTH
Notes: RN ndiko kuramba kwemuviri kweN zone
VTH ndiyo inovhura-on voltage yePN junction
RP ndiko kupikisa kwakawanda kwenzvimbo yeP
Iko kupisa kunogadzirwa nemagetsi anopedzwa ndeiyi:
Q = Pt
Ikoko: t ndiyo nguva iyo diode inosimbiswa.
Muchidimbu, iyo LED ichiri semiconductor diode. Naizvozvo, kana iyo LED ichishanda munzira yekumberi, maitiro ayo ekushanda anoenderana nerondedzero iri pamusoro. Simba remagetsi raanoshandisa ndere:
P LED = U LED × I LED
Ikoko: U LED ndiyo yekumberi voltage pane iyo LED mwenje sosi
I LED ndiyo ikozvino inoyerera kuburikidza ne LED
Simba remagetsi rinopedzwa rinoshandurwa kuita kupisa uye rinoburitswa:
Q＝P LED × t
Notes: t isimba-panguva
Muchokwadi, simba rinoburitswa kana erekitironi rasanganazve negomba mudunhu reP harina kupihwa zvakananga nekunze kwemagetsi, asi nekuti erekitironi iri munharaunda yeN, kana pasina nzvimbo yemagetsi yekunze, chiyero chesimba chayo chakakwira. kupfuura iyo yeP region. Valence electron level yakakwirira kudarika Eg. Kana yasvika P nharaunda uye recombines pamwe maburi kuva valence maerekitironi muP nharaunda, inobudisa simba rakawanda kudaro. Saizi yeEg inotarwa nechinhu pachayo uye haina chekuita nekunze kwemagetsi. Basa rekunze kwesimba rekupa kune erekitironi nderekusundidzira kuti ifambe yakananga uye kukunda basa rePN junction.
Kuwanda kwekupisa kunogadzirwa ne LED hakuna chokuita nekushanda kwechiedza; hapana hukama pakati pehuwandu hwehuwandu hwemagetsi emagetsi anogadzira chiedza, uye chikamu chakasara chemagetsi emagetsi chinobudisa kupisa. Kuburikidza nekunzwisiswa kwemafungiro ekugadzirwa kwekupisa, kupisa kwekupisa uye kupisa kwekusangana kwe-high-power LEDs uye kutorwa kwemaoretical formula uye zviyero zvekupisa kwekupisa, tinogona kudzidza magadzirirwo chaiwo ekuputira, kuongorora uye kushandiswa kwechigadzirwa kwema LED ane simba guru. Izvo zvinofanirwa kucherechedzwa kuti kupisa manejimendi inyaya yakakosha padanho razvino rekushomeka kwemagetsi e LED zvigadzirwa. Kunyanya kuvandudza kupenya kwesimba kudzikisa chizvarwa chekupisa simba ndiko kuzasi kweketero. Izvi zvinoda kugadzirwa kwechip, kurongedza kwe LED uye kugadzirwa kwechigadzirwa chekushandisa. Tekinoroji kufambira mberi mumativi ese.
