(Silicon Controlled Rectifier)

1
?20? ???????
20.1 ???
20.2 ??????
20.3 ??????
20.4 ?????????
20.5 ????
2
?20? ???????
????
1.????????????????? ??????? 2.
????????????????? ???????????? 3.
????????????????? ??
3
??? (Silicon Controlled Rectifier)
???????????????????? ?????????????????????? ??????
?? ????????????????????,???????????,??????????
?????????
???????????????????????????????
???(??????????????????)?

4
20.1 ???

• 20.1.1 ????

????????PN??????, ????????????
G
(c) ??
????????????
5
??????PNP?NPN?????????
6
20.1.2 ????
???????
A
G
?????????????????,?????????
EG
K
EA gt 0?EG gt 0
7
20.2.2 ????
G
??????,??EG , ?????,?????????
K
EA gt 0?EG gt 0
8
????????
1. ???????(???????)??????? 2.
???????(????????)??????????(??????)?
??????,????????? ?????,????????????
????????
1. ????????????,???????????? 2.
??????????????????????????
9
20.1.3 ????
??????
????
IG2 gt IG1 gt IG0
??????
??????
????
????
10
20.1.4 ????
UFRM
????????(??????) ????????????????,????????????????
??? ???UFRM 80 UB0 ? ????? UFRM ?100V 3000V
11
?????????????Im, ?
?????IF?1A 1000A?
12
IH ???? ?????????????,??????
???????????? ??IH??? ??????
UF ??????(???) ???????,???????????,
??????????????? ???1V???
UG?IG?????????? ???,???????6V?,?????
??????????????????? ? ??UG?1?5V,IG?????????
13
?????????
????????? ???, ???AI??0.41.2V
????,??????????UFRM?URRM???
????????(IF)
?KP5-7???????????5A,?????700V?
14
20.2 ??????

• 20.2.1 ????????
• 1. ?????

(1) ??
u gt 0 ? ?ug 0,??????,
????????,?????????? ?,
u lt 0 ? ????????????, uo 0,
uT u ,???????
15
(2) ????
?t1
u lt 0 ? ????????????
????????
16
(3)????
2?
?t2
?t1
O
O
???
??
???
?????? ?????????????????
17
(4)?????????????
?????
??????,???????Uo?
18
2. ???????????
(1)??
??????? ,??????????,??????????????????(????),?
?????,???????(???)?
???u???,???????????,??????????
????,?????????
19
2) ????(???????)
2?
?t2
?t1
O
20
3.?????(??????)
(1) ??


ugt 0? D????,??????????
21
(3)????(??????)
2?
iL
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20.2.2 ??????????
1. ??
2. ????
(1)??u ?????
T1?D2???? ??? T1????????, ?T1?D2? ?,??????
a
??,T2?D1???????????
23
(2)??u ?????
T2?D1???? ??? T2????????, ?T2?D1? ?,??????
b
??,T1?D2???????????
24
3. ????
2?
??
25
4. ???????????
26
??????????
(1)

• ??????????,???
• ??????

?? ??
2. ?????????????
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(2)
1. ???????????,D1?D2 ?? ????????
?? ??
2. ??T1????T2?????,??? ?????????????
20.2.3 ??????????
??
28
20.2.4 ??????????
1. ??
2.????
??
29
20.3 ??????
?????????????????,?????????
?????????,????????,??????,???PN???,???????????????
?100A????????400A?,?????0.02?,?????????
?????????????,????????????,??????,????????????????
??,???????,????????,??????
30
20.3.1 ????????

• 1. ???????

????????????????????,??????????????,??????,?????
?????
????????????,??????
?????
?????
??? ???
31
2. ???????
????(???)????(???)????????,??????????,?????,??
??????
3. ??????
????????????,????????????????????????,????
???????????????????,?????????????????
32
20.3.2 ????????

• 1. ????

???????????????????? ???????????????,?????? ???
???
????? ?????
???? (????)
2. ????
33
20.4 ?????????

• 20.4.1 ????????????
• 1.??

PN?
N???
(a) ???
????????????????
34
2. ????
?????
? ???(0.5 0.9)
? UE lt ? UBBUD UP ?
PN???,IE??
PN?????, IE?????
????????????
35
3 .??????????
???UEgtUP?, ????????, ??IE???UE? ???,?????
Ip
IV
36
????????
1. UE lt UP??????
UE gt UP??????, UE lt UV??????
2.??????????UP? ??????UBB?????
??,????UBB???????,???? ?UP???
3. ????????????UV?????IV? ???????????2
5V?????? ?????, UV????????,????
???????????
37
20.4.2 ?????????

• 1. ????

??????? ????????? ??????RC?? ????????? ???
??????
???????????
38
2. ??????

????uC0?
????U, ??C???R???????uC?????
?uC ? UP?,?????,? ?C??,R1?????????
(a)
(b)
????? uC ? Uv?,???????,?ug?0?
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??R???????,?????????,????????
(c) ????
40
20.4.3 ??????????????
1. ??
41
2. ????
(1)????
??
? ?
42
(2) ????
(3) ????uL
O
O
?t
43
? ? ? ?
1. ?????????????,?????? ???????????????
?????????????????????(?????),????????????????,?
???????????????????????(?????)???????????
2. ?????,???????????
??????????????????(???),???????????????????,???
??????????????????? ???????,??????????????
44
3. ????????,???????????? ?????????
????????,???????,????????????,????????,?????????
??,???????????????????
????????????????? ????????????????
4. ?????
45
?????????
???????????R1??(???),?? ??????????????????????
?????????,????????,??? ??????????D1,
????????,? ??D2,?????????
46
????????????
47
20.5 ????

• 1. ???????

??????????????,????, ????????????????????
48
????
R2 ?RP? C ?T1 ? R3 ? R4 ?????????????
???????????,?????????????????
49
????????????,????????????UP?????DZ?????,??
???????,????????????,????????
50
???????????????????D???R1?????
?????????,????D?R1?????
?????????D??,??????R2 ? RP?C?????RP??,????????
?? ???
51
2. ?????
????????????,??????????
??
??
?????????????????
52
UA1gtUA2?,??????A2????, ???????,???A1??A2?
UA2gtUA1?,??????A2????, ???????,???A2??A1?
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• ??????

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