All ETDs from UAB

Advisory Committee Chair

Mohammad R Haider

Advisory Committee Members

Karthikeyan Lingasubramanian

Nasim Uddin

Dalton S Nelson

Emil Jovanov

Document Type

Dissertation

Date of Award

2019

Degree Name by School

Doctor of Philosophy (PhD) School of Engineering

Abstract

Batteries have always been considered as one of the important, reliable, light-weight, and ubiquitous energy sources in our daily lives. As battery technology has progressed, different types of battery controlling, monitoring, and supervising technologies are also being rapidly developed. Most of the modern portable electronic devices are battery-powered (lithium-ion batteries, solar cells, fuel cells, etc.). The charging and discharging of the batteries are normally based on DC-DC converter. Form converter structure, the switches and capacitors based converter without inductive components is widely applied. In addition, the switched-capacitor (SC) converters are typically integrated with a monolithic integrated circuit, the low-cost and large-scale integration of the IC provides the possibility to operate in complex battery management system (BMS). For modern devices, the battery management systems are supposed to satisfy some specific requirements. First, the battery management system should have fast dynamic response which could handle the load change and noise immediately. Secondly, the system should have a stable steady-state which is critical for continuous charging and dis-charging. Finally, the system should have a strong capability to manage multiple batteries (i.e. battery network management). In order to build a portable, lightweight, miniature and flexible, fast and wireless charging battery management system, this proposed study focuses on high efficiency, high frequency and faster dynamic response SC DC-DC converter for battery-based applications. In this dissertation, we present a study of developing SC DC-DC converter approaches to perform critical functions in the battery management system. We begin with a brief introduction to the battery management system. Then, we propose and develop a complementary methodology that compensates the weakness of SC DC-DC converter in equivalent output impedance, dynamic response, and power efficiency. We have demonstrated the proposed converter in buck and boost configurations. Another important aspect is that we implement the proposed converter circuit on monolithic integrated circuit design. At last, we propose a three-coil loosely coupled inductive link, which enhanced the long-distance, low coupled factor (K), and low quality factor (Q) for wireless power transmission applied in battery management system. Checking from simulation results, our proposed circuits has high power efficiency, low-power dissipation, and high dynamic response in battery management system.

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