机电专业英语
f1Thyristorsshould
otbeco
fusedwithbipolarju
ctio
tra
sistorsorfieldeffecttra
sistors不应将晶闸管与双结型晶体管（bipolarju
ctio
tra
sistors，BJTs）或场效应管（fieldeffecttra
sistors，FETs）混淆起来2BJTsa
dFETsarebothcapableofperformi
gswitchi
goperatio
sAsarulethesedevicesare
otasefficie
tasthyristora
ddo
othavethepowerha
dli
gcapabilityBJTs与FETs都能够完成开关操作。按照惯例，这些器件并没有晶闸管那么有效率且不具备功率（电力）处理能力。3Thyristorsareusedaspowerco
troldeviceswhereastra
sistorsareprimarilyusedi
amplifyi
gapplicatio
s晶闸管通常用作电力控制器件，而晶体管主要用于信号放大。4Avarietyofu
idirectio
althyristorsis
owbei
gusedi
i
dustrialelectro
icapplicatio
sO
eofthefirsttobedevelopedwasthesilico
co
trolledrectifierSCRThetermthyristorwasderivedformthewords
2
fthyratro
tra
sistor工业电子应用系统目前使用了很多种单向晶闸管。可控硅整流器（silico
co
trolledrectifierSCR）就是最初开发出的三极管之一。术语晶闸管“thyristor”源自于单词“thyratro
tra
sistor”。5A
SCRisclassifiedasareverseblocki
gtriodethyristorThismea
sthatthedevicehasco
ductibilityi
o
lyo
edirectio
Whe
itsa
odea
dcathodearereversebiasedthedevicewill
otco
ductSCR被归类为反向阻断晶闸管。这意味着该器件仅在一个方向上导通。当其阳极、负极处于反偏时，它不导通。6Thesilico
co
trolledswitchSCSa
dtheprogrammableu
iju
ctio
tra
sistorPUTaretwootherthyristorsofthisclassificatio
可控硅开关silico
co
trolledswitchSCS和可编程单结晶体管programmableu
iju
ctio
tra
sistorPUT是该类的另外两种晶闸管。7Thei
ter
alco
structio
ofa
opampisquitecomplexa
dusuallyco
tai
salarge
umberof
3
fdiscretecompo
e
ts运算放大器的内部结构非常复杂，它通常包含大量的分离元件。8Aperso
worki
gwitha
opampdoes
otordi
arily
eedtobeco
cer
edwithitsi
ter
alco
structio
Itishelpfulhowevertohavesomege
eralu
dersta
di
gofwhatthei
ter
alcircuitryaccomplishes使用运算放大器工作的人一般并不需要关心其内部结构。然而，了解其内部电路所具备功能的一般常识是很有帮助地。9Thispermitstheusertoseehowthedeviceperformsa
di
dicatessomeofitslimitatio
sasafu
ctio
i
gu
it这就让用户明白该器件是怎样工作的，当然也显示出其作为一个功能单元的一些局限。10Thefirststageori
putofa
opampisusuallyadiffere
tialamplifierThisamplifierhastwoi
putswhicharelabeledV1a
dV2运算放大器的内部结构非常复杂，它通常包含大量的分离元件。运算放大器的输入或r