16-Capacitors and Inductors

16-Capacitors and - Capacitors and Inductors Capacitors and Inductors Fred Terry Fall 2008 2008 1 Energy Storage Elements Capacitors and Inductors

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apacitors and Inductors Capacitors and Inductors © Fred Terry all, 008 Fall, 2008 1
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Energy Storage Elements • Capacitors and Inductors Store Electromagnetic Energy – Useful in Power Conditioning (A.C. to D.C. Conversion) – Useful in Filtering Circuits • Takes Time To Change Energy Storage (unless you have infinite power available). •T h e C a pacitors and Inductors in a Circuit Are Strong Factors in Determining Frequency Response and Speed of All Real Circuits • Parasitic (unavoidable but present) Elements in Transistor Circuits (a little in EECS 215, more in EECS 311, 312, model building in EECS 320) • Delays on Real Wires (Transmission Lines, EECS 230, 2 330).
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Physics • Detailed E&M from Maxwell’s Equations hys 240 Phys 240 – EECS 230 ere We Will Use the Resulting Circuit • Here We Will Use the Resulting Circuit Laws from This Physics 3
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Ideal Capacitor Basics i c + ++++++++++++++++++++++++++++++++ + σ c/m 2 V v c - Dielectric Media ε Perfect Insulator d ------------------------------------------------ c c iC t = - σ c/m 2 h h l t Q A ( ) CV Charge on each plate Q=A σ = A ε E =(A ε V/d)=CV Equal and opposite total charges on each plate Total Device is Neutral Device storage energy in E-field 4
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Ideal Capacitor Basics i c V v c + c c iC t = - C in Farads 1F=1 C/V V c must be continuous function of time t. Otherwise i c is infinite (& power is infinite).
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This note was uploaded on 01/31/2011 for the course EECS 215 taught by Professor Phillips during the Spring '08 term at University of Michigan.

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16-Capacitors and - Capacitors and Inductors Capacitors and Inductors Fred Terry Fall 2008 2008 1 Energy Storage Elements Capacitors and Inductors

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