Yuav Ua Li Cas Txiav Txim Triac Electrodes nrog Multimeter
Ordinary thyristors (VS) yog qhov tseem ceeb DC tswj cov khoom siv. Txhawm rau tswj AC load, ob lub thyristors yuav tsum tau txuas nrog rov qab polarity nyob rau hauv parallel, kom txhua tus SCR tuaj yeem tswj tau ib nrab-yoj. Rau lub hom phiaj no, yuav tsum tau muaj ob pawg ntawm kev ywj pheej trigger circuits, uas tsis yooj yim rau siv.
Bidirectional thyristor yog tsim los ntawm lub hauv paus ntawm thyristor zoo tib yam. Nws tuaj yeem hloov tsis tau tsuas yog ob lub thyristors txuas nrog rov qab polarity nyob rau hauv parallel, tab sis tsuas yog xav tau ib qho hluav taws xob hluav taws xob. Nws yog ib qho zoo tagnrho AC hloov khoom siv tam sim no. Nws lub npe lus Askiv TRIAC txhais tau tias peb lub davhlau ya nyob twg ob txoj kev AC hloov.
Lub hauv paus ntsiab lus
Txawm hais tias lub triac tuaj yeem suav tias yog kev sib xyaw ntawm ob lub thyristors zoo tib yam hauv daim ntawv, nws yog lub zog sib xyaw ua ke ntawm 7 transistors thiab ntau yam resistors. Cov khoom siv hluav taws xob tsawg feem ntau yog ntim rau hauv cov yas, thiab qee qhov kuj muaj lub dab dej kub, raws li pom hauv daim duab 1. Cov khoom lag luam yog BCMlAM (1A/600V), BCM3AM (3A/600V), 2N6075 (4A/600V), MAC{ {12}} (8A/800V) thiab lwm yam. Feem ntau ntawm cov high-power triacs tau ntim rau hauv hom RD91. Cov tsis tseem ceeb ntawm bidirectional thyristor muaj nyob rau hauv cov lus txuas.
Cov qauv thiab cov cim ntawm bidirectional thyristor muaj nyob rau hauv daim duab 2. Nws belongs rau NPNPN tsib-txheej ntaus ntawv, thiab peb electrodes yog T1, T2, thiab G raws. Vim tias cov cuab yeej tuaj yeem ua cov kev coj ua bidirectional, ob lub electrodes tshwj tsis yog lub rooj vag G tau sau ua ke hu ua lub ntsiab terminals, uas yog T1 thiab T2. Qhia tias nws tsis tau muab faib ua anodes lossis cathodes. Nws tus yam ntxwv yog hais tias thaum lub voltages ntawm G ncej thiab T2 ncej yog zoo txheeb ze rau T1, T2 yog lub anode thiab T1 yog lub cathode. Hloov pauv, thaum qhov voltages ntawm G thiab T2 ncej yog qhov tsis zoo rau T1, T1 dhau los ua anode thiab T2 yog cathode. Cov yam ntxwv ntawm volt-ampere ntawm bidirectional thyristor yog qhia nyob rau hauv daim duab 3. Vim yog lub symmetry ntawm lub pem hauv ntej thiab rov qab cov yam ntxwv nkhaus nkhaus, nws muaj peev xwm tig nyob rau hauv txhua txoj kev.
Kev kuaj xyuas txoj kev
Cov hauv qab no qhia txog cov txheej txheem ntawm kev siv cov ntaub ntawv multimeter RX1 los txiav txim siab cov electrode ntawm triac, thiab tseem kuaj xyuas lub peev xwm ua rau.
1. Txiav txim siab T2 ncej
Nws tuaj yeem pom los ntawm daim duab 2 tias G ncej yog ze rau T1 ncej, thiab nyob deb ntawm T2 ncej. Yog li ntawd, kev tawm tsam rau pem hauv ntej thiab rov qab ntawm G-T1 yog qhov tsawg heev. Thaum siv lub iav RX1 los ntsuas qhov kev tawm tsam ntawm ob txhais taw, tsuas yog qhov kev tiv thaiv qis yog qhia ntawm G-T1, qhov kev tawm tsam rau pem hauv ntej thiab rov qab tsuas yog kaum ntawm ohms, thiab rau pem hauv ntej thiab thim rov qab ntawm T2-G thiab T2-T1 Cov kev tawm tsam yog tag nrho infinite. Qhov no qhia tau hais tias yog ib ko taw thiab ob txhais taw tsis txuas nrog, nws yuav tsum yog T2 ncej. , Ntxiv rau, siv TO-220 pob triac, T2 ncej feem ntau txuas nrog lub dab dej me me, thiab T2 ncej kuj tuaj yeem txiav txim siab raws li.
2. Distinguishing G ncej thiab T1 ncej
(1) Tom qab pom tus ncej T2, thawj zaug xav tias ib qho ntawm ob txhais taw ntxiv yog T1 ncej thiab lwm qhov yog G ncej.
(2) Txuas qhov kev sim dub coj mus rau T1 ncej thiab qhov kev sim liab coj mus rau T2 ncej, qhov kev tiv thaiv tsis kawg. Tom qab ntawd luv-circuit T2 thiab G nrog lub ntsis ntawm lub ntsuas liab, thiab siv lub teeb liab tsis zoo rau G ncej. Tus nqi tiv thaiv yuav tsum yog li kaum ohms (saib daim duab 4(a)), uas ua pov thawj tias lub raj tau qhib, thiab cov kev taw qhia conduction yog T1-T2. Tom qab ntawd tshem tawm cov lus taw qhia liab ntawm G ncej (tab sis tseem txuas rau T2), yog tias tus nqi kuj tseem tsis tau hloov, nws ua pov thawj tias lub raj tuaj yeem tswj tau qhov kev coj ua tom qab ua rau (saib daim duab 4(b)).
3) Txuas cov kev xeem liab coj mus rau T1 ncej thiab qhov kev sim dub coj mus rau T2 ncej, ces luv luv-circuit T2 thiab G, thiab siv lub teeb pom kev zoo rau G ncej, tus nqi kuj tseem yog li kaum ohms, yog tus nqi kuj tseem tsis hloov tom qab disconnecting ntawm tus ncej G, nws txhais tau hais tias tom qab lub raj yog triggered, lub conduction lub xeev kuj yuav tsum tau khaws cia nyob rau hauv lub T2-T1 kev taw qhia, yog li nws muaj ib tug bidirectional triggering khoom. Qhov no ua pov thawj tias qhov kev xav saum toj no yog qhov tseeb. Txwv tsis pub, qhov kev xav tsis sib haum nrog qhov xwm txheej tiag tiag, thiab yuav tsum ua lwm qhov kev xav thiab rov ua qhov ntsuas saum toj no. Obviously, nyob rau hauv tus txheej txheem ntawm kev txheeb xyuas G thiab T1, lub triggering peev xwm ntawm triac kuj raug kuaj. Yog tias qhov ntsuas tau ua raws li qhov kev xav, lub triac tsis tuaj yeem tshwm sim thiab qhib, uas ua pov thawj tias lub raj tau puas lawm. Rau 1A raj, RX10 kuj tuaj yeem siv rau kev tshawb nrhiav. Rau 3A thiab siab dua 3A raj, RX1 yuav tsum raug xaiv, txwv tsis pub nws yog qhov nyuaj rau kev tswj xyuas lub xeev conduction.
