Improving performance, efficiency, and reliability of DC-DC conversion systems by differential power processing
Shenoy, Pradeep
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https://hdl.handle.net/2142/34525
Description
Title
Improving performance, efficiency, and reliability of DC-DC conversion systems by differential power processing
Author(s)
Shenoy, Pradeep
Issue Date
2012-09-18T21:24:03Z
Director of Research (if dissertation) or Advisor (if thesis)
Krein, Philip T.
Doctoral Committee Chair(s)
Krein, Philip T.
Committee Member(s)
Sauer, Peter W.
Shanbhag, Naresh R.
Domínguez-García, Alejandro D.
Pilawa-Podgurski, Robert C.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
power electronics
solar photovoltaic (PV)
energy conversion
differential power processing
voltage regulators
Maximum power point tracking (MPPT)
series circuits
power optimizer
Abstract
Direct current (dc) systems are found in a broad range of devices including computer microprocessors, battery packs, and solar photovoltaic (PV) arrays. Operating the energy conversion systems in these devices with high efficiency, performance, and reliability is important. This dissertation examines several circuit-based techniques and power conversion architectures that meet system objectives while only processing a small portion of the total energy. To take the performance capabilities of conventional dc-dc converters beyond their physical limits, the converters must be augmented with additional energy paths that act to nullify transients. Augmentation of a buck converter and a boost converter is analyzed and experimentally verified. Differential power processing architectures are introduced for series connected systems. Connecting the voltage domains of dc systems in series enables both the series elements and the energy conversion circuits to operate in their most efficient regimes and enhance overall system efficiency and reliability. This dissertation presents methods for regulating the intermediate voltage domains. Two applications, microprocessor power delivery and solar PV energy conversion, are specifically examined and validated experimentally.
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