Doctoral Dissertations

Anfeng Huang

Abstract

“Stable power delivery is becoming increasingly important in modern electronic devices, especially in applications with stringent requirements of its form factor. With the evolution of technology, the switching frequency in a power converter is pushed to a higher frequency range, e.g., several MHz or even higher, to decrease its size. However, the loss generated in the converter increases drastically due to the high switching frequency. In addition, a wide-band feedback controller is required to accommodate the high switching frequency in the converter. We focus on the characterization or modeling of the feedback control circuits and critical components in a switching power converter.

A transient-simulation-oriented averaged continuous-time model is proposed to evaluate the transient output noise of a buck converter. The proposed modeling method is developed with time-domain waveforms, which enables a generalized modeling framework for current-mode controllers with constant and nonconstant switching frequencies.

In this work, we mainly focus on characterization for two types of components: the switching components, including Si MOSFETs and GaN High-electron-mobility transistor (HEMT), and the magnetic core in an inductor.

For the characterization of switching components, a set of test fixtures are designed to characterize the equivalent circuit of Si MOSFETs and GaN HEMTs. The frequency-dependent behaviors of Si MOSFETs are observed, which invalidate the conventional modeling methods for MOSFETs, especially for radiated emission (RE) prediction.

For the characterization of magnetic cores, two different probe calibration methods are demonstrated. Accurate phase discrepancy characterization is allowed with the proposed method, which overcomes the main limitation in the conventional two-winding method. In addition, the proposed method supports wide-band loss measurement without resonance tuning, which supports core loss measurement for non-sinusoidal excitation”--Abstract, page iv.

Advisor(s)

Hwang, Chulsoon
Fan, Jun, 1971-

Committee Member(s)

Khilkevich, Victor
Beetner, Daryl G.
Brow, Richard K.

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Comments

This dissertation is based upon work supported partially by the National Science Foundation (NSF) under Grant No. IIP-1916535.

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2022

Journal article titles appearing in thesis/dissertation

  • Transient Behavior Model of Current-Mode Buck Converters for Power Distribution Network Design
  • Fixture Design for Parasitic Capacitances of MOSFETs for EMI Applications
  • Impedance Converter Based Probe Characterization Method for Magnetic Materials Loss Measurement
  • Improved Current Shut Characterization Method for Ferrite Loss Characterization

Pagination

xv, 110 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2022 Anfeng Huang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12115

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