Title:
Computationally-Enhanced Non-Isolated High Voltage Point-of-Load DC-DC Converters for High Performance Computing
Computationally-Enhanced Non-Isolated High Voltage Point-of-Load DC-DC Converters for High Performance Computing
Author(s)
Gong, Minxiang
Advisor(s)
Raychowdhury, Arijit
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Abstract
High voltage power bus (48 V) is replacing conventional 12 V power bus in many systems such as data centers and auto-motives for improved power delivery efficiency and capability. Therefore, high voltage point-of-load (POL) DC-DC converters (48-to-1 V) are essential in future systems. This dissertation explores circuit designs of high-efficiency high-density non-isolated high voltage POL converters. Compared to prior works, computational methods are implemented to optimize converter's performance. First, a simulation framework and a design space exploration are provided, which reduce the design complexity and enables proposed computation-assisted design methodology. Next, a Gallium Nitride (GaN) based reconfigurable and digital programmable hybrid converter is presented, which supports wide range of operation at high efficiency. Third, a self-optimized hybrid converter with GaN/Si hybrid conversion is presented. The proposed topology not only achieves high efficiency with the run-time optimization, but also reduces the required number of capacitors for improved power density. Next, a dual-path hybrid converter design with low-profile inductors and fully on-chip bootstrapping circuits for extreme high current density is proposed. Finally, conclusions are given for high voltage POL converter designs and future research directions are discussed.
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Date Issued
2022-11-29
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Dissertation