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Title:A power supply circuit for gate driver of flying capacitor multi-level converters
Author(s):Ye, Zichao
Advisor(s):Pilawa-Podgurski, Robert
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):power electronics
power converter
flying capacitor multilevel converter
multi-level converter
gate driver
power supply
charge pump
isolated dc/dc converter
Abstract:This work investigates new circuits to provide power for the gate drivers of flying capacitor multi-level (FCML) converters. FCML converters with new GaN power switches have received increased attention due to their potential to achieve high conversion efficiency and high power density. However, one of the major challenges is providing power to its gate drive circuits, as the terminals do not have constant references. The most common existing method utilizes an isolated DC/DC converter, which is bulky and energy inefficient. This thesis introduces three new techniques termed cascaded bootstrap, double charge pump and gate-driven charge pump. A new power supply circuit combining the three techniques altogether is developed and used to deliver the required gate voltage using internally available voltage nodes. The proposed circuit can help shrink the size of the overall converter, and further increase conversion efficiency. Prototypes have been built to show the functionality and simplicity of the circuit. Experimental results show that the proposed circuit is up to 3x more power efficient than the current method, at 1/10 of the cost.
Issue Date:2016-07-19
Rights Information:Copyright 2016 Zichao Ye
Date Available in IDEALS:2016-11-10
Date Deposited:2016-08

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