Handout_10_-_Energy_Storage_Element - EE 101A / Winter 10...

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1 EE 101A / Winter 10 Handout # 10 EE 101A Energy Storage Elements Reference – Hambley, Chapter 3, Chapter 3.1 – 3.5, 3.7 1. Motivation Capacitor and inductor can store energy temporarily and later return it to the circuit, and thereby affect the temporal behavior of a circuit. These components can be intentionally introduced to achieve a certain electrical behavior, or are parasitic elements that limit the circuit performance. 2. Capacitor - Electrical Energy Storage q = C v ( q in Coulomb, C in Faraday, v in Volt) (1) C A d (2) = dielectric constant (F/cm) = r A = area d = thickness of dielectric i dq dt C dv dt ( 3 ) P iv Cv dv dt E P dt C vdv C v 2 2 (4) q v C
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2.1 Ceramic Capacitor Two electrodes separated by and encased in ceramic. Non-polar (symmetrical), high voltage capability (few hundred volts), low capacitance (< 100nF), low cost. Multi-layered surface mounted capacitor, medium voltage (< 100 volts), medium capacitance (< 100 F), small footprint. 2.2 Film Capacitor Polymer (e.g., Mylar, Mica, Teflon, …. .) film coated with metal layers in a wrap around structure. Non-polar, very high voltage capability (> 1000 volts), medium capacitance (< 10 F), low cost, but bulky.
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This note was uploaded on 03/30/2010 for the course EE 101A taught by Professor Wong during the Winter '08 term at Stanford.

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Handout_10_-_Energy_Storage_Element - EE 101A / Winter 10...

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