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Title:Voltage regulation of a series stacked system of digital loads by differential power processing
Author(s):Das, Dipanjan
Advisor(s):Krein, Philip T.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Differential Power Processing
Series-stacked power delivery
Series stacking
Bidirectional power converters
Abstract:A modern high-end multi-core microprocessor has very stringent power supply requirements. It can draw hundreds of amperes of current at supply voltages as low as 0.8 V. As the supply voltages keep decreasing, the power delivery to meet the supply requirements is becoming increasingly difficult and inefficient. However, the presence of multiple cores in the microprocessor offers us a way to power it at a higher voltage by series-stacking the cores. Differential power processing has been shown to be an efficient way to series-stack server loads. In this work we study the dynamics of the element-to-element DPP topology implemented with bi-directional buck-boost converters. Some of its dynamic drawbacks are pointed out and a topological modification to counter those drawbacks is proposed. We then develop a linear control to regulate processor core voltages in a series stack of 4 cores. A hysteretic control to accommodate light load modes in the bi-directional regulating converters is also discussed. Both the linear and the hysteretic controller are implemented successfully in hardware and efficiency improvement due to light-load modes is demonstrated.
Issue Date:2016-04-28
Rights Information:Copyright 2016 Dipanjan Das
Date Available in IDEALS:2017-09-29
Date Deposited:2016-05

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