CH9 正弦稳态电路的分析

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Unformatted text preview: ; U = jX C I X L Z = jX C (XC = − 1 ) ωC 4 RLC串联电路: i . R L + + uR - + uL u C - ++ + uC - jω L R I . U - . U R- . + UL1 jω C +. UC - & U 1 Z = & = R + jω L − j = R + jX = Z ∠ ϕ I ωC && & & & 取支路电流为参考相量, 令:I = I∠0° U = U R + U L + UC & UL 电压三角形: & UC & U ϕ UX ϕ & UR U & I UR U= UX UR = U cos ϕ U X = U sin ϕ 2 UR 2 +UX UX ϕ = arctg UR 5 二、正弦电流电路的稳态分析: 电阻电路与正弦电流电路相量法分析比较: 电阻电路 : 正弦电路相量分析 : ⎧ KCL : ∑ i = 0 ⎪ ⎪ KVL : ∑ u = 0 ⎨ ⎪ 元件约束关系 : u = Ri ⎪ 或 i = Gu ⎩...
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This document was uploaded on 01/12/2014.

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