??:???(SCR)(Silicon Controlled Rectifier)???????????,???70?????????????????????????? - PowerPoint PPT Presentation

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Title:

??:???(SCR)(Silicon Controlled Rectifier)???????????,???70??????????????????????????

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Title: 20 Author: zy.ahezz.com Last modified by: Created Date: 4/2/2000 4:36:55 AM Document presentation format: – PowerPoint PPT presentation

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Title: ??:???(SCR)(Silicon Controlled Rectifier)???????????,???70??????????????????????????


1
?19?
?17? ???????
17.1 ??????? 17.2 ???????? 17.3 ?????? 17.4
???? 17.5 ???????????? 17.6 ???????? 17.7
???????????
2
???(Thyristor)
?????(SCR)(Silicon Controlled
Rectifier)???????????,???70???????????????????????
???
?????????????????? ???(??????????????????)?
????
  • ??(?? ? ??)
  • ??(?? ? ??)
  • ??(?? ? ??)
  • ??(?? ? ??)

????????????
3
17.1 ????
1. ??
PNPN???????
4
2. ????
??
5
???????????
T1?T2????,????UGK, T1?T2????
6
???????? (1)??A???? (2)???G???????
????????
(1)??A?????,???????(?UGK 0 )?
(2)????????,?????,????UAK(??UAK??),???????????????
IH ( IH??????)
7
??????????
(1)???????????
??????A?K??????,G?K?????????
(2)???????,?????????
?????,???? UAK ???????,???????????????
8
17.2 ?????
1. ??
???????1V
????????
?IG?
IG0?
????
??
??
9
???? ??????,?UAK???,??????????U
UDSM(??????)?,?????????????, UAK??? UDSM ?
????????????,?????????,? U URSM
(??????)?,??????????,????????URSM?
10
2. ????
(1) UDRM??????
?????????? UDRM 80 UDSM (??????)? ?????UDRM ?
100V---3000V
11
(2) URRM??????
??????,??????????????????????URRM 80
URSM(??????)??????URRM?100V--3000V)
12
(3) IF????????
?????
1?5?10? 20?30?50?100?200?300?400 500?600?800?1000A
?14????
13
17.3 ??????
1. ??????????
(1) ???????
14
(2) ????(?u1????)
u2 gt 0 ?,?????? uG ,????? ?? uL ???? uG ????????
u2 lt 0 ?,?????,uL 0 ????????
15
(3) ???????????
16
?????????
17
?????(???????????)
???????
u2?????????,u2???,?????????
???????????,??????????????,?????????
??????????D,??D??????????????,?????u2?????
18
2. ??????????
???????????????
(1) ???????
  • u2 gt 0?????

u2 (A)
T1
RL
u2 (B)
D2
T1 ?D2??, T2 ?D1??
19
  • u2 lt 0?????

T2
u2 (B)
RL
u2 (A)
D1
T2 ?D1??, T1 ?D2??
20
(2) ????
21
(3) ???????????
22
??????????,U2220V,RL3?,???????15180?,????????
Uo?????,?????(?????)?????????????????????
191V, ?15?
0V, ?180?
191/364A
23
???????????????
????????????????????????????????????
24
?????????????
1. ??????????,?????????
?? ??
2. ?????????????
25
???
T1
D1
R
uL
u2
L
T2
D2
1. ???????????,D1?D2 ??????????
?? ??
2. ??T1????T2?????,????????????????
26
17.4 ????
1. ?????????
27
????
?uE lt UP UAUF ?
PN???,iE??
? uE ? UP ?
PN?????, iE?????
? -- ??? (0.35 0.75)
28
2. ???????????
uEltUV ??????
uEgtUP ??????
29
???????
30
3. ?????????
(1) ????
????
31
(2)??????
(a) uE uC ltUP ?,??????,uo ? 0?
??R1??????,???
R1?R2????,???? ??RB1?RB2?????? ??????
RB1RB2 ???215???
32
(b) ???? ??,uC?????? uC ? UP ?,????????????,R1???
????????
UP?UV-- ???????
R2???????
(c) ????? uc ? uv?, ???????,? uo?0?
33
17.5 ????????????
????
????
???
34
??????
????????
35
?????????
36
???????????
37
????
1. ?????????????,?????????????????????
38
2. ?????,???????????
39
3. ????????,?????????????????(????? ?????)????
40
4. ????????,????????
41
1. ?????????????,?????????????????????
???????????????????(?????),????????????????,??????
??????????????????(?? ???),???????????
42
2. ?????,???????????
??????????????????(???),???????????????????,?????
????????????????????????,??????????????
43
3. ????????,?????????????????(????? ?????)????
????????,???????,????????????,????????,???????????
,??????????????????
44
???????????
f???????
45
4. ????????,????????
?????
????????
RP
?
?????
46
17.6 ????????
??????????
??
47
????
UCC
J
1. ??????????
????????????,????????????????T1T2T3???T3?T2????
?????????????,????????,?????
T3
D1
T2
D2
T1
T1??????
T1????????? ??,?????D2? ?,???????
48
2. ????
??????????????????? ????,????????
????7
??S
T1??
T2??
??S
????10
??S
????2
T3??
49
??
?
??????????
7--10--2
?
???????????????????????
50
?????????????????????????????????????????,???????
??(R)????????,???????????????????,???????????????
?
51
17.7 ???????????
1. ??????
??????????????????
?????????,????,??????,??????
????100A????????400A?,?????0.02?,??????
?????????????,????????????,??????,????????????????
?,??????,????????,??????
52
????????
???????????????
???????????????????
?????????????????? ????????,?????????
53
??????
?????????????????????????????,?????????
????
????
????????,???????,?????,???????
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