L15 Inductors - EE 40 Inductors EE 40 Lecture 15: Inductors...

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Unformatted text preview: EE 40 Inductors EE 40 Lecture 15: Inductors 1 Static versus Dynamic Capacitor Stores charge (or water) Large current when shorted Inductor Stores flux High voltage when open-circuited EE 40 Lecture 15: Inductors 2 Inductors EE 40 Lecture 15: Inductors 3 http://personal.ee.surrey.ac.uk/Personal/H.M/UGLabs/images/inductor_packages.jpg parts.digikey.com Inductance L [Henry] [H] Typical values: nH mH Capacitance versus Inductance Capacitor Stores charge DC open Inductor Stores flux DC short Physically large More expensive than capacitors EE 40 Lecture 15: Inductors 4 C versus L EE 40 Lecture 15: Inductors 5 time v x time i x C versus L EE 40 Lecture 15: Inductors 6 Capacitors resist change of voltage: voltage v x does not change abruptly when switch is thrown from left to right are DC open circuits: the current through a capacitor goes to zero for constant voltage, dv x /dt=0 store voltage Inductors resist change of current: current i x does not change abruptly when switch is thrown from left to right. are DC short circuits: the voltage across an inductor goes to zero for constant current, di x /dt=0 store current Wire Inductance EE 40 Lecture 15: Inductors 7 r a 0.05 0.1 0.15 0.2 0.25 500 1000 1500 2000 1.919 10 3 105.086 L c r 1mm nH 30cm 3cm r = ? ln 4? 2 e.g. r = 10, a = 1mm L c = 500nH Power Supply Wires EE 40 Lecture 15: Inductors 8 Power supply Electronic Circuit (Load)...
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L15 Inductors - EE 40 Inductors EE 40 Lecture 15: Inductors...

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