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Description:
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This thesis explores some new applications in power electronics for supercapacitors . This involves the design and development of dc -dc converters to interface the supercapacitor banks with the rest of the power electronic system . Two applications for supercapacitors are proposed and analyzed . The first application is aimed at high power applications such as motor drives . The proposed approach compensates the effect of voltage sags in the dc link of typical adjustable speed drives , thus reducing speed fluctuations in the motor and eliminating the possibility of nuisance tripping on the drive control board . The second approach presented in this thesis explores the use of supercapacitors to extend run -time for mobile devices such as laptop computers and hand held devices . Three possible approaches are explored : a ) Supercapacitors connected directly across the battery ; b ) Battery -inductor -supercapacitor connection ; and c ) Supercapacitor , and battery connected via a DC -DC converter . Analytical models , simulation and experimental results on a typical laptop computer are presented . |