Multi-Phase DC Power Supply Topologies with Fast Response for Telecom and Point-of-Load Applications

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dc.contributor.advisorKrishnamoorthy, Harish S.
dc.contributor.committeeMemberRajashekara, Kaushik
dc.contributor.committeeMemberChen, Yuhua
dc.contributor.committeeMemberLi, Xingpeng
dc.contributor.committeeMemberHawke, Joshua T.
dc.creatorYerra, Srikanth
dc.date.accessioned2022-06-30T22:45:20Z
dc.date.createdMay 2021
dc.date.issued2021-05
dc.date.submittedMay 2021
dc.date.updated2022-06-30T22:45:21Z
dc.description.abstractThe evolution of the 4G/5G communication networks along with high-speed computing and datacenter facilities increased the demand for compact, efficient, and reliable power supplies with faster output response speeds. The advancements in high-speed semiconductor switching devices and magnetics have constantly raised the scope for the design of efficient, compact power supplies with a faster dynamic response. These opportunities and requirements are contributed to undertake the research proposed in this work. In high-speed radio frequency (RF) communication applications, when supplied with a constant power source the radio frequency power amplifier (RFPA) dissipates energy in the form of heat. This power loss increases proportionately with the speed of the communication system. This needs more cooling and makes the overall system bulky. In this work, efficient power supply topologies with fast varying output voltage are proposed to modulate the drain power supply of an RFPA and reduce the loss dissipation. Multilevel converters are explored as a suitable option for this application and high-frequency gate drive circuits are proposed. A cascaded switching capacitor-based three-level multi-phase converter is proposed to eliminate complex switching capacitor voltage control circuitry. A modified PWM technique is introduced to maintain a linear relationship of output to the input voltage. Zero voltage switching (ZVS) output filter design is proposed to reduce turn-on switching loss and maintain current self-balancing in the multi-phase converter. Point-of-load (POL) regulators are used in the DC power distribution of data centers to convert high DC bus input voltage (12 V – 48 V) to the low POL output voltage (1.2 V – 6 V). The load current demand fluctuates rapidly over a wide range, and if it’s not properly taken care of, the output voltage fluctuates and may damage the sensitive load equipment. In addition, data centers consume a large amount of power which leads to the development of high-efficiency power converters to remain cost-effective. In this work, a single-stage efficient POL converter is proposed to address the high-speed load current transients and regulate the output voltage. A variable switching frequency scheme is proposed to improve the light load efficiency and current self-balancing is used to improve the power-sharing in the multi-phase converter.
dc.description.departmentElectrical and Computer Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: S. Yerra, H. S. Krishnamoorthy and G. S. Kulothungan, "Design and Analysis of Fourth Order ZVS Output Filter for Three-Level Buck Envelope Tracking Power Supply," 2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2020, pp. 1-6, doi: 10.1109/PEDES49360.2020.9379478; and in: S. Yerra and H. Krishnamoorthy, "Multi-Phase Three-Level Buck Converter with Current Self-Balancing for High Bandwidth Envelope Tracking Power Supply," 2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020, pp. 1872-1877, doi: 10.1109/APEC39645.2020.9124075; and in: S. Yerra, H. Krishnamoorthy and Y. Yao, "Single Stage Three-Level Interleaved Buck Converter with Current Self-Balancing for Improved Point-of-Load Performance," 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020), 2020, pp. 1-6, doi: 10.1109/PESGRE45664.2020.9070580; and in: S. Yerra, H. Krishnamoorthy and J. Hawke, "Three-Level DC-DC Converter using eGaN FETs for Wide Bandwidth Envelope Tracking Applications with Extended Output Voltage Range," 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), 2019, pp. P.1-P.9, doi: 10.23919/EPE.2019.8915515.
dc.identifier.urihttps://hdl.handle.net/10657/10241
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectEnvelope Tracking
dc.subjectbootstrap power supply
dc.subjectGaN FET
dc.subjectgate driving techniques
dc.subjecthigh switching frequency
dc.subjectdrain supply modulator
dc.subjectZVS
dc.subjectcurrent balancing
dc.subjectfilter design
dc.subjectmulti-phase buck
dc.subjectmulti-level
dc.subjectswitched capacitor
dc.subjectpower amplifier
dc.titleMulti-Phase DC Power Supply Topologies with Fast Response for Telecom and Point-of-Load Applications
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2023-05-01
local.embargo.terms2023-05-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentElectrical and Computer Engineering, Department of
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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