Yuav ua li cas kom raug xaiv silicon tswj Cheebtsam rau induction melting rauv

Kev xaiv kom raug ntawm cov khoom siv hluav taws xob xws li thyristors thiab rectifiers yog qhov tseem ceeb los xyuas kom meej qhov kev ntseeg tau ntawm induction melting rauv thiab txo tus nqi ntawm induction melting rauv. Kev xaiv ntawm cov khoom yuav tsum ua tib zoo xav txog yam xws li kev siv ib puag ncig, txoj kev ua kom txias, hom Circuit Court, load zog, thiab lwm yam, thiab coj mus rau hauv tus account kev lag luam raws li kev ua kom ntseeg tau tias qhov tsis zoo ntawm cov khoom xaiv muaj cov npoo.

Txij li thaum daim ntawv thov teb ntawm cov khoom siv hluav taws xob hluav taws xob yog qhov dav heev, thiab cov ntawv thov tshwj xeeb muaj ntau yam, cov hauv qab no tsuas yog piav qhia txog kev xaiv ntawm thyristor Cheebtsam hauv rectifier circuits thiab ib-theem nruab nrab zaus inverter circuits.

1 Rectifier circuit device xaiv

Fais fab zaus rectification yog ib qho ntawm feem ntau siv teb ntawm SCR Cheebtsam. Cov khoom xaiv feem ntau suav nrog nws qhov ntsuas hluav taws xob thiab ntsuas tam sim no.

(1) Lub rau pem hauv ntej thiab rov qab ncov voltages VDRM thiab VRRM ntawm thyristor ntaus ntawv:

Nws yuav tsum yog 2-3 zaug ntawm qhov siab tshaj plaws voltage UM uas cov khoom ua tau dais, uas yog, VDRM / RRM = (2-3) UM . UM qhov tseem ceeb sib xws rau ntau yam kev hloov kho circuits tau qhia hauv Table 1.

(2) Rated on-state tam sim no IT (AV) ntawm thyristor ntaus ntawv:

IT (AV) tus nqi ntawm thyristor yog hais txog tus nqi nruab nrab ntawm lub zog zaus sine ib nrab-yoj, thiab nws cov txiaj ntsig zoo ITRMS = 1.57IT(AV). Txhawm rau tiv thaiv cov khoom tiv thaiv los ntawm kev puas tsuaj los ntawm overheating thaum lub sijhawm ua haujlwm, qhov txiaj ntsig zoo uas ntws los ntawm cov khoom siv yuav tsum sib npaug rau 1.57IT (AV) tom qab tau muab faib ua qhov kev nyab xeeb ntawm 1.5-2. Piv txwv tias qhov nruab nrab load tam sim no ntawm lub rectifier Circuit Court yog Id thiab tus nqi zoo ntawm qhov tam sim no ntws los ntawm txhua lub cuab yeej yog KId, qhov ntsuas ntawm lub xeev tam sim no ntawm cov khoom xaiv yuav tsum yog:

IT(AV)=(1.5-2)KId/1.57=Kfd*Id

Kfd yog xam coefficient. Rau lub kaum sab xis tswj α = 0O, ​​Kfd qhov tseem ceeb nyob rau hauv ntau yam rectifier circuits tau qhia hauv Table 1 .

Table 1: Qhov siab tshaj plaws siab tshaj voltage UM ntawm cov khoom siv rectifier thiab kev suav coefficient Kfd ntawm qhov nruab nrab ntawm lub xeev tam sim no

Lus Cim: U2 yog tus nqi zoo ntawm theem nrab voltage ntawm lub ntsiab voj transformer; ib nrab-yoj inductive load Circuit Court muaj ib tug freewheeling diode.

Thaum xaiv cov khoom tivthaiv IT (AV) tus nqi, cov cua kub dissipation hom ntawm cov khoom yuav tsum tau txiav txim siab. Feem ntau, qhov ntsuas tam sim no tus nqi ntawm tib yam ntawm cov cua txias yog qis dua li cov dej txias; Nyob rau hauv cov ntaub ntawv ntawm ntuj txias, qhov ntsuas tam sim no ntawm cov khoom yuav tsum raug txo mus rau ib feem peb ntawm tus qauv txias txias.