R S)=[SIAJ= △(s) S 其中 R △(s) S十 LC MODERN CONTROL SYSTEMMODERN CONTROL SYSTEM 3             − +  = − = − s L L C R s s s s 1 1 ( ) ( ) 1 ( ) 1 Φ I A LC s L R s s 1 ( ) 2  = + + 其中: