项目七 电路的暂态过程
description
Transcript of 项目七 电路的暂态过程
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510
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RC RL RC
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7.1.1 7.1.2
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7.1.1 1. u-qq(t)uC(t)uC-quC-q 7.17.1
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(1) (2)ict (3)uc(t)t uC(t)iC(t)7.1(a)
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1
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=0
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7-1 4.75F 50Hzu(t)= V1
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3
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3) iL(t)iL(t)(7.2(a))7.2(b)
7.2
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iL(t)
L
(7-8)
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(1) uL(t)=0 (2) 3)()
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4)
5)
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2. (1) (2) (3)
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3. 7.3(a)7.3(b)RCRL 7.3 RCRL
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uC(0+)iL(0+) t=0+ t=0+ 7.1.2
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(1) (2) uC(0-)=0uC(0+)=0 (3) iL(0-)=0iL(0+)=0 (4)
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7-2 7.4(a) :(1) 7.4(a)
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(2)0+7.4(b)7.4 7-2
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7-3 7.5(a)t=0 17.5 7-3
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(27.5(b)
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RC Z RC
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RC7.2.1 RC7.2.2 RC7.2.3 RC7.2.4
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7.2.1 RC RCuC(0+)
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7.6RC1uc(0+)=Us
7.7 7.6 RC 7.7
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=RCRC
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uC(t)i(t)7.8
7.8 (3~5)
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7-4 7.6C=10FR=5k210-3J(1)uC(t)iC(t)(2)8V(3)4s2VR(1)(7-5)
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uC(0+)iC(0+)(7-22)(7-24) V A(2)uC(t)=8V t=0.018s(3)R=uC(t)=2VC=10Ft=4s R=173.9 k
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7.2.2 RC 7.9(a)SRCuC(0+)=0RC SuCUS
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7.9 RC
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KVLRCuC(t) i(t) uC(t)i(t)7.9(b)7.9(c)
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7-5 7.9(a)US=12VR=5kC=1000FSt=0uCiC (1) US=12V (2)
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7.2.3 RC RCRC
7.10 RC
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7.10(a)2 uC(0+)=uC(0-)=U2 S21U1 (7-36)
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(7-40) (7-40)RCU1U1
(7-41) (7-41)RC
- 7.10(a)3 (1)U1=U2(7-40)uC(t)=U1 (2)U1>U2CU17.10(b) (3)U1
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7-6 7.11t 0uc(t)i(t) :(1) :=10 v =2.25v=RC=(R1//R2)C=1.125s V(2)A7.11 7-6
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7.2.4 (7-40)RC f(t)(7-40)uC(t)tt+ (7-42) (7-43)
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(7-44) (RCReqCRLL/Req)3 (7-44)
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7-7 7.12R1=R2=R3=2kC=3103pFUS=12VSuC(0-)=0t=0SuC (1) uC(0+)=uC(0-)=07.12 7-7
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(2) (3)
(4)uC()uC()(7-44)
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RL RC RLRCL RLRCRL
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RL7.3.1 RL7.3.2 RL7.3.3 RL
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7.3.1 RL iL(0+)RL 7.14S1S2iL(0+)=iL(0-)= S1S2 (7-45)
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iL (7-49)
(7-50)
(7-50)(7-45)R2 (7-51)
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7.15
7.14 RL 7.15 RL
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7.15RL (3~5) RLRL
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7-9 7.16RLSt=0SUS=200VR0=10L=0.5HR=40iLuLuR(1)SS A (2) (3)7.16 7-9
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7-10 7.17Si L
t >0 S
7.17 7-10
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A
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7.3.2 RL 7.18S iLuLKVL
7.18 RL
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RL
7.19iLuLuRRL7.19 RL
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7-11 7.18US=10VR=10L=5HS(1)(2)t=0st=+ (1)
(2)t=0st=+ L
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7.3.3 RL RLRL7.20
7.20 RL
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7-12 7.20US=100VR0=R=50L=5HSt=0SiLuL (1)
(2)
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RC RC()()RCRC
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RC7.4.1 RC7.4.2 RC
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7.4.1 RC RC7.21(a) 7.21(b)50 TwTTwT =RCTwuoR
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7.21
- 1. 1t=0uC(0+)=uC(0-)=0uo (0+)=ui=U2R t< uCuoR17.21(c)0
- 2. t=T/2uiRCuo=uC=-UR17.21(c)
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RC(1) (2)R
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7.4.2 RC 7.21(a) 7.22(a)7.22bc
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7.22
- 1. t=0 UuCuo7.22(c) 0
- 2. t=T/2 U1()U7.22(c)
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RC(1) (2)
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