电容电压或电感电流初值的跃变.ppt

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1、§6-9电容电压或电感电流初值的跃变一.在冲激激励下，电容电压或电感电流初值的跃变iCC例1+-uCtucuC(0-)uC(0+)0tic0二.换路后电路有纯电容(或纯电容和电压源）构成的回路，且构成回路的电容和电压源0-初值的电压代数和不为零，电容电压初值发生跃变。tuLuL+-iL例2+-tiLiL(0-)iL(0+)0合闸后由KVLuc(0+)=EEiCCk(t=0)例1uctE0ict(CE)0已知：E=1V,R=1,C1=0.25F,C2=0.5F,t=0时合k。求：uC1，uC2。解电容电压初值一定会发生跃变。合k前合k后例2ER

2、C1C2+-uc1+-uc2k(t=0)iiC1iC2节点电荷守恒q(0+)=q(0-)uC()=1V=R(C1+C2)ut01/3uC21uC1it-1/62/9iC14/91/6iC2三.换路后电路有纯电感(或纯电感和电流源）构成的割集，且构成割集的电感和电流源0-初值的电流代数和不为零，电感电流初值发生跃变。k例+-10V20.3H0.1Hi1i23+u1-+u2-电感电流发生跃变已知如图求：i1，i2和u1,u2。解(0+)=(0-)回路磁链守恒i()=2A=(0.3+0.1)/(2+3)=0.08s+-10V20.3

3、H0.1Hi1i23+u1-+u2-it03.755i2i12ut-0.375u10.375-2.1875-6.5625u2§6-10脉冲序列作用下的RC电路uS+-uC(0-)=0R+uC-+uR-一.T>>ustT2T3T10000

4、+-uC(0-)=0R+uc-+uR-设uS=100V63.223.371.826.472.926.973.126.973.1tT2T3T4T5T6T7T8T100uC0t=TuC=100+(-100)0.368=63.2t=2TuC=63.20.368=23.3t=3TuC=100+(23.3-100)0.368=71.8t=4Tuc=71.80.368=26.40

5、)T(2n+1)T