电工技术PPT(席时达第四版)第5章

1、1234567电阻电路电阻电路uS闭合前：闭合前：0 i0R utoi电流电流 i 随电压随电压 u 比例变化。比例变化。uS S闭合后：闭合后： US+-uR8电容电路电容电路uS闭合前：闭合前：0C i0C uUSuS S闭合后：闭合后：uRUS+-iC uC+ CutoUS9C 储能储能221CCCuW L 储能储能221LLLiW 10111213iLUS +-uC +-iRiC14A224)0(SL RUi0)0(C uA2)0()0(LL ii0)0()0(CC uuiLUS +-uC +-iR15US +-iRiCiLA2)0(L iA2)0()0(LC ii0)0(R i+16

2、归纳归纳1718 19UuC +-i+ uR -S S闭合后闭合后: :Uuu CRRiu RUutuRC CCdd分析思路UutuRCCC dd)dd(代入tuCiC 20UutuRCCC dd0ddCC utuRC 11 RCp tCCAuu e)(ptAe21暂态分量：暂态分量：稳态分量：稳态分量： tCCAuu e)(22 tCCAuu e)(CC)0(uu )()0( CCuuA tCCCCuu(uu e()0 (）2324 uC（0+）= uC（0-）iL（0+）=iL（0-） tffftf e)()0()()(251221210RRRRR CRRRRCR21210 260)(0)

3、(0- CCuu tCCCCuuuu e()0()(）)0()e1()e1( tUUutRCtC UuC )(uC U+ uR -i+-270)()0( iRUi tiiii e()0(） tRUi e 0)()0(RR uUu tuuuu )e()0()(RRRR tRUu e 28RuuC ()=URUtoi29RC sVsAAVVCF 30C R C （）R （）3100.3680120.36810.3682to32231uC ()=U0. 632UuCtouC的的uC3323uC ()=U0. 632U0. 632U0. 865U0. 950U0. 982U0. 993U45to0 C

4、u 2 3 4 5340 Cu 2 3 4 5 )(t53 35 tCUu 0e 0)( Cu0-)(0)(0UuuCC RC uC + uR -i+-U+- tCCCCuuuu e()0()(）36 tRUi 0e tiiii )e()0()( tRRRRuuuu )e()0()( tRUu 0e u + u -+-370. 632U0toRU.03680 RU0 U.UuC00836e1 t当当 时时38U+-uC +-39URRRuC212)( CRRRRCR21210 21210RRRRR U+-40 tCCCCuuuu )e()0()()e1(e0212212212 ttCURRRU

5、RRRURRRu URRR212 tO41归纳归纳42-)( f-)0( f - tffftf e)()0()()(43 )(t53 44EDA实验实验45EDA实验实验RC充放电464748iUR -uL +U tiiii )e()0()()e1( tRUi RUiii )(0)0()0(0RL 49 tLLLLuuuu )e()0( ） tUtLLuu e)e0( tRURiu e 0)()0( LLuUu50 O51UR -uL +Ui tiiii e)()0()(52 tiiii e)()0()(tLRtIii e)e0(0 0)0(Ii 0)( iRL RIuL0)0( 0)( Lu

6、tLRRIudtdiLuLL e)e(00t- 53tLRRIuuL e0RO54U-+UiL55RRLiRU)(i)(iLLL 0)(00 tLLLLiiii e)()0()(RUR tLRRLRUi e56iUR -uL +Ui)(-)(00RRRURRIUL 57归纳归纳 ttLLUuu e)e0()1( teRUi )e1(R tURiu 58 ttLLRIudtdiLu e)e0(0 ttIii e)e0(0 tLRIuu e0R5960tpUt1t2ptRC CR1u2u+_+_iCu+_61tpUUTUt1t2otototCRU2u+_+_i一一正尖正尖脉冲，脉冲，Pt 62CRU2u+_+_i负负tpUUTU-Ut1t2otototPt 632C1uuu Cuu 1tuRCtuRCRiudddd1CC2 CR1u2u+_+_iCu+_64ptRC CR1u2u+_+_i65tUotpt1t2toCR1u2u+_+_i66Cuuu R1R1uu tuRCtRuCtiCuuCd1d1d11R2 CR1u2u+_+_i67归纳归纳 1.6869 -t/)e(- )(0)()(ffftf7071)0()0()0()0( LiLiCuCu72 tffftf )e0()0()()(3.3.时间常数时间常数