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Extending Efficiency in a DC/DC converter with automatic mode switching from PFM to PWM


Abstract Switch mode DC/DC converters are suited for battery powered applications, due to their high efficiency, which help in conserving the battery lifetime. Fixed Frequency PWM based converters, which are generally used for these applications offer good voltage regulation, low ripple and excellent efficiency at high load currents. However at light load currents, fixed frequency PWM converters suffer from poor efficiencies The PFM control offers higher efficiency at light loads at the cost of a higher ripple. The PWM has a poor efficiency at light loads but good voltage ripple characteristics, due to a high switching frequency. To get the best of both control modes, both loops are used together with the control switched from one loop to another ba... (more)
Created Date 2014
Contributor Vivek, Parasuram (Author) / Bakkaloglu, Bertan (Advisor) / Ogras, Umit (Committee member) / Song, Hongjiang (Committee member) / Arizona State University (Publisher)
Subject Electrical engineering / Analog design / Buck converter / Efficiency / PFM / Power Management IC
Type Masters Thesis
Extent 60 pages
Language English
Copyright
Reuse Permissions All Rights Reserved
Note M.S. Electrical Engineering 2014
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis