Cov txheej txheem rau kev ntsuas qhov zoo ntawm cov khoom siv hluav taws xob siv lub tshuab multimeter
Thaum lub sij hawm txij nkawm, ib tug multimeter yuav tsum tau siv los xyuas qhov zoo ntawm cov khoom siv hluav taws xob raws li qhov teeb meem txhaum cai. Yog tias txoj kev ntsuas tsis raug, nws yuav ua rau muaj kev txiav txim siab tsis raug, uas yuav ua rau muaj teeb meem hauv kev saib xyuas kev ua haujlwm thiab txawm tias tsis tsim nyog kev lag luam poob. Cov txheej txheem ntsuas tau muab faib ua ob hom: kev ntsuas tivthaiv thiab Circuit Court board hauv kev ntsuas hluav taws xob. Nyob rau hauv txoj kev xeem: Disconnect lub hwj chim mov ntawm lub zaus converter thiab ntsuas cov Cheebtsam ntawm lub Circuit Court board tsis disassembled lawv. Rau cov khoom tawg, luv Circuit Court, thiab qhib Circuit Court faults, txoj kev tshawb pom no tuaj yeem yooj yim thiab sai nrhiav cov khoom puas. Txawm li cas los xij, qhov cuam tshuam ntawm cov khoom ntsuas ntawm lub rooj tsav xwm hauv Circuit Court thiab lawv cov khoom sib txuas ntawm qhov ntsuas ntsuas yuav tsum tau txiav txim siab kom tsis txhob muaj kev txiav txim siab yuam kev. Nov yog txoj hauv kev los txiav txim qhov zoo ntawm cov khoom siv hluav taws xob:
1. Kev txheeb xyuas cov diodes zoo tib yam
Ntsuas nrog MF47 multimeter, txuas cov xov tooj liab thiab dub rau ob qhov kawg ntawm lub diode, nyeem cov ntawv nyeem, thiab tom qab ntawd hloov cov kev sojntsuam rau kev ntsuas. Raws li cov txiaj ntsig ntawm ob qhov kev ntsuas, qhov kev tiv thaiv pem hauv ntej ntawm lub zog qis germanium diodes feem ntau yog 300-500 Ω, thaum silicon diodes yog li 1k Ω lossis ntau dua. Qhov rov qab ua haujlwm ntawm germanium raj yog ntau kaum ntawm kiloohms, thiab qhov rov qab ua haujlwm ntawm silicon raj yog siab dua 500k Ω (tus nqi ntawm lub zog siab diode yog ntau dua). Lub diode zoo muaj qhov tsis zoo rau pem hauv ntej thiab rov qab ua haujlwm siab, thiab qhov ntau dua qhov sib txawv rau pem hauv ntej thiab thim rov qab, qhov zoo dua. Yog hais tias qhov ntsuas rau pem hauv ntej thiab thim rov qab yog me me thiab ze rau xoom, nws qhia tau hais tias lub diode luv luv circuited sab hauv; Yog hais tias lub pem hauv ntej thiab rov qab tsis kam yog siab heev los yog nyhav rau infinity, nws qhia tau hais tias muaj ib tug qhib Circuit Court nyob rau hauv lub raj. Hauv ob qho xwm txheej, lub diode yuav tsum tau muab pov tseg.
Ntawm txoj kev kuaj: Kev sim rau pem hauv ntej thiab thim rov qab ntawm diode pn junction ua kom yooj yim dua los txiav txim siab seb lub diode puas muaj kev tawg luv luv lossis qhib Circuit Court.
2. Pn junction nrhiav kom tau
Teem lub digital multimeter rau diode hom thiab ntsuas pn junction nrog rau kev sojntsuam. Yog hais tias nws ua nyob rau hauv pem hauv ntej kev taw qhia, tus naj npawb tso tawm yog rau pem hauv ntej voltage poob ntawm pn junction. Ua ntej, txiav txim siab lub collector thiab emitter electrodes; Ntsuas qhov hluav taws xob rau pem hauv ntej poob ntawm ob pn junctions nrog ib qho kev sojntsuam. Lub emitter muaj qhov siab tshaj plaws voltage poob, thaum lub collector muaj qhov qis tshaj voltage poob. Thaum kuaj ob qhov kev sib txuas, yog tias qhov kev sojntsuam liab txuas nrog rau cov khoom siv hluav taws xob, qhov kev sim transistor yog hom npn, thiab cov xov tooj liab txuas nrog lub hauv paus b. Yog hais tias qhov kev sojntsuam dub txuas nrog rau cov khoom siv electrode, qhov kev sim transistor yog hom pnp, thiab cov electrode no yog lub hauv paus b. Tom qab lub transistor puas lawm, pn junction tuaj yeem muaj ob qhov xwm txheej: tawg luv luv thiab qhib Circuit Court.
Hauv kev ntsuam xyuas hluav taws xob: Hauv kev ntsuas hluav taws xob ntawm lub transistor yog ua tiav los ntawm kev sim rau pem hauv ntej thiab rov qab tsis kam ntawm pn junction los txiav txim seb lub transistor puas. Cov ceg tsis kam yog ntau dua qhov kev tiv thaiv pem hauv ntej ntawm pn junction. Feem ntau, yuav tsum muaj qhov sib txawv tseem ceeb hauv kev ntsuas rau pem hauv ntej thiab thim rov qab, txwv tsis pub pn kev sib tshuam yuav puas. Thaum cov ceg tiv thaiv tsawg dua qhov kev tiv thaiv pem hauv ntej ntawm pn hlws ris, ceg yuav tsum raug txiav, txwv tsis pub qhov zoo ntawm transistor tsis tuaj yeem txiav txim siab.
3. Peb theem rectifier choj module nrhiav kom tau
Noj Semikron rectifier choj module ua piv txwv, raws li qhia hauv daim duab txuas. Teem lub digital multimeter rau lub diode xeem hom, txuas cov dub sojntsuam mus rau com thiab liab sojntsuam mus rau v ω, thiab siv cov liab thiab dub sojntsuam ntsuas lub pem hauv ntej thiab rov qab diode yam ntxwv ntawm theem 3, 4, thiab 5 thiab ncej 2 thiab 1, raws li, los xyuas thiab txiav txim seb tus rectifier choj puas lawm. Qhov sib txawv ntawm qhov ntsuas qhov zoo thiab qhov tsis zoo, qhov zoo dua; Yog tias cov lus qhia rau pem hauv ntej thiab thim rov qab yog xoom, nws qhia tau tias cov theem kuaj tau raug tawg thiab luv circuited; Yog hais tias ob qho tib si rau pem hauv ntej thiab rov qab cov lus qhia yog infinite, nws qhia tau hais tias lub sij hawm kuaj tau raug txiav. Yog tias ib theem ntawm tus choj rectifier module puas lawm, nws yuav tsum tau hloov.
4. Inverter IGBT module nrhiav kom tau
Teem lub digital multimeter rau diode xeem hom thiab sim cov yam ntxwv ntawm lub hauv ntej thiab rov qab diode ntawm IGBT modules c1. e1i c 2. e2, nrog rau ntawm rooj vag g thiab e1, e2, txhawm rau txiav txim siab seb IGBT module puas zoo lawm.
