A Dynamic Wide-Bandwidth Compensation for Non-Inverting Buck-Boost Converter

Huan Nguyen; Wan Yeong Jung

doi:10.23075/jicas.2022.8.4.002

Huan Nguyen Korea Advanced Institute of Science & Technology https://orcid.org/0000-0002-4547-7772
Wan Yeong Jung Korea Advanced Institute of Science & Technology https://orcid.org/0000-0002-5671-1341

DOI: https://doi.org/10.23075/jicas.2022.8.4.002

Keywords: Compensation, DC-DC Converter, Fast transient response

Abstract

A non-inverting buck-boost converter is a converter which produces a positive output voltage that is either larger or smaller than the input voltage. This type of converter finds use in various applications in general and mobile application in particular. However, there are some problems that limit the performance of the converter. First, the non-minimum phase characteristic in boost mode makes it hard to compensate the converter with high bandwidth. Therefore, the compensation network is usually designed with small bandwidth to ensure the stability of the system. Thus, the system response over a range of input, output voltage is unacceptable in some applications. In addition, the converter is commonly compensated and optimized for some specific values of input, output voltage. As a result, the stability of the converter is only guaranteed at this particular operating condition and the circuit probably become unstable when the operating condition such as input, output voltages and load current change. In this paper a dynamic compensation technique that optimizes the controller under various input, output voltage, load current conditions is presented which improve bandwidth and transient response of the converter. The theory and simulation show the effectiveness of the approach.

Author Biographies

Huan Nguyen, Korea Advanced Institute of Science & Technology

Huan Nguyen received the B.S.degree in Electronics and Telecommunications from Hanoi University of Science and Technology, Hanoi, Vietnam, in 2014. He is currently a Ph.D candidate in Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST). His research interests are in the area of DC-DC converters.

Wan Yeong Jung, Korea Advanced Institute of Science & Technology

Wanyeong Jung received his B.S. degree from Seoul National University, Seoul, Korea, in 2012 and the Ph.D. degree in electrical engineering from the University of Michigan, Ann Arbor, MI, USA, in 2017. From August 2017 to August 2019, he worked at the Microsystems Technology Laboratories in the Massachusetts Institute of Technology a postdoctoral associate. Since 2020, he has been with the Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea where he is now an Assistant Professor. His primary research interests lie in the general area of analog and digital circuits, with an emphasis on autonomous low-power systems such as remote sensor devices and other Internet of Things (IoT) applications. His dissertation research in the University of Michigan focused on low-power analog circuit techniques for realizing a small, low-power systems such as on-chip energy harvesting, power management, sensing, and data conversion. In MIT, he extended his research area to digital circuits including energy-efficient inference accelerators and secure IoT systems.

Homepage : https://seed.kaist.ac.kr/