2021年电路分析基础典型例题.pdf

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1、例 2-15 用网孔法求图2-24 所示电路的网孔电流，已知1，1。解：标出网孔电流及序号，网孔1 和 2 的 KVL方程分别为m1m2m362216IIIm1m2m31262IIIU对网孔 3，满足m33II补充两个受控源的控制量与网孔电流关系方程1m12UI；3m1m2III将1，1代入，联立求解得m1m2m34A1A3AIII，。例 2-21 图 2-33（a）所示电路，当R 分别为 1、3、5时，求相应R 支路的电流。（a）（b）（c）（d）图 2-33 例 2-21 用图解：求 R 以左二端网络的戴维南等效电路，由图2-33（b）经电源的等效变换可知，开路电压V2062222)428

2、212(o1U注意到图 2-33（b）中，因为电路端口开路，所以端口电流为零。由于此电路中无受控源，去掉电源后电阻串并联化简求得12222o1R图 2-33（c）是 R 以右二端网络，由此电路可求得开路电压V48)444(o2U输入端内阻为2o2R图 2-24 例 2-15 用图精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 1 页，共 4 页再将上述两戴维南等效电路与R 相接得图 2-33（d）所示电路，由此，可求得R1时，A4211420IR3时，A67.2321420IR5时，2042A125I例 3-10 在图 3-26 所示的电路中，电容原先未储能，已知 US=12

3、V，R1=1k，R2=2k，C=10F，t=0 时开关 S闭合，试用三要素法求开关合上后电容的电压uC、电流 iC、以及 u2、i1的变化规律。解：求初始值CC(0)(0)0uuS1C1(0)(0)12mAUiiR求稳态值2CS12R()8VuURRC()0AiS112()4mAUiRR求时间常数12121s150RRCRR写成响应表达式t150tCCCC()(0)()8(1)Vuuuueet150tCCCC()(0)()12mAiiiieet-150t1111()(0)()(48)mAiiiiee例 3-11 在图 3-27 所示的电路中，开关S长时间处于“1”端，在 t=0 时将开关打向“

4、2”端。用三要素法求t 0 时的u C、u R。图 3-27 例 3-11 图图 3-26 例 3-10 图精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 2 页，共 4 页文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A

5、2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7

6、B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2

7、F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G

8、7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5

9、U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5

10、K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2解：求初始值CC24(0)(0)515V35uuRC(0)(0)3015

11、Vuu求稳态值C()30VuR()0Vu求时间常数3641050010s2sRC写成响应表达式t-0.5tCCCC()(0)()(3015)Vuuuueet0.5tRRRR()(0)()15Vuuuuee例 4-20 RLC串联电路，已知R=30、L=254mH、C=80F，o2202sin(31420)Vut，求：电路有功功率、无功功率、视在功率、功率因数。解：o220 20 VU?LCj()30j(79.8-39.8)ZRXXo(30j40)50 53.1ooo220204.433.1 A5053UIZ?2204.4968VASUIoocos968cos20(33.1)581.2WPUIo

12、osin968sin20(33.1)774.1VarQUIoocoscos20(33.1)0.6例 4-22 某个 RLC串联谐振电路中R=100，C=150pF，L=250H，试求该电路发生谐振的频率。若电源频率刚好等于谐振频率，电源电压U=50V，求电路中的电流、电容电压、电路的品质因数。解：6012611rad/s5.16 10 rad/s1501025010LC精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 3 页，共 4 页文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 Z

13、Y7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编

14、码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5

15、 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2

16、 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文

17、档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3

18、E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7

19、W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A265005.16 108.210223.14fzz050A0.5A100UIR15.162501290LCC01645VUIC12.9LQR例 5-5 对称星形连接的三相负载，每相阻抗为(4j3)Z，三相电源线电压为380V，求三相负载的总功率。解：已知线电压为L380VU，则相电压为PL1220V3UU，因此线电流PL2222044A43UIZ负载的阻抗角为P3arctan36.94因此三相负载总的有功

20、、无功和视在功率分别为LLP3cos338044cos36.923.16kWPU ILLP3sin338044sin36.917.38kVarQU ILL333804428.96kVASU I精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 4 页，共 4 页文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7

21、A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U

22、7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K

23、2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5

24、G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S

25、5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B

26、5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2文档编码:CM6S5U7B3E5 HL10B5K2F7W2 ZY7I5L5G7A2