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Unformatted text preview: ECE 201 Lecture 24 2 nd order RLC circuits, Source free or constant input (Undamped) LC Circuit Initial conditions: Goal: KCL and KVL: VI Relations: Differential equation for v C (t) Differential equation for i L (t) Differential Equations for v C (t) and i L (t) and are both of the general form with solution Check: amplitude phase angular velocity Conclusions: for some K and for some K and undamped oscillation natural (resonant) frequency Total Energy = ( 29 ( 29 2 2 1 1 . 2 2 Tot C L E C t Li t Cons = + = How to determine K and ? for some K and with Use the initial conditions: Take the quotient: Use the fact that How to determine K and ? for some K and with Use the initial conditions: Take the quotient: Use the fact that ( 29 ( 29 sin L i t K t = + ( 29 ( 29 cos L L di t L LK t dt = = + ( 29 ( 29 L L i i i + = = ( 29 sin K i = ( 29 ( 29 ( 29 L C C + + = = = ( 29 cos LK = ( 29 tan L i = 1 tan L i  = 2 2 2 2 2 2 1 i K L K + = 2 2 2 2 K i L = + sin and cos combination! with How to find A & B? ( 29 ( 29 sin L i t K t = + ( 29 ( 29 L L i i i B + = = = ( 29 ( 29 ( 29 L C C LA + + = = = = ( 29 L i i = ( 29 C  = ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 sin sin cos cos sin L i t K t K t t = + = + ( 29 ( 29 ( 29 ( 29 cos sin sin cos K t K t = + ( 29 ( 29 sin cos A t B t = + ( 29 ( 29 ( 29 cos sin L L di t L L A t B t dt = = A L = Serial RLC Circuit are given KCL KVL In terms of v C In terms of i L differentiate v C (t)=?, i L (t)=?...
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 Spring '08
 EUDEY
 Macroeconomics

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