A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications

Truong Thi Kim Nga; Seong-Mun Park; Young-Jun Park; Sang-Hyuk Park; SangYun Kim; Truong Van Cong Thuong; Minjae Lee; Keum  Cheol Hwang; Youngoo Yang; Kang-Yoon Lee

doi:10.3390/en11071618

Energies (Jun 2018)

A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications

Truong Thi Kim Nga,
Seong-Mun Park,
Young-Jun Park,
Sang-Hyuk Park,
SangYun Kim,
Truong Van Cong Thuong,
Minjae Lee,
Keum Cheol Hwang,
Youngoo Yang,
Kang-Yoon Lee

Affiliations

Truong Thi Kim Nga: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Seong-Mun Park: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Young-Jun Park: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Sang-Hyuk Park: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
SangYun Kim: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Truong Van Cong Thuong: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Minjae Lee: School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
Keum Cheol Hwang: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Youngoo Yang: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea
Kang-Yoon Lee: College of Information and Communication Engineering, Sungkyunkwan University, Seoul 16419, Korea

DOI: https://doi.org/10.3390/en11071618
Journal volume & issue: Vol. 11, no. 7
p. 1618

Abstract

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This paper presents a wide range buck-boost direct current to direct current (DC–DC) converter for wireless power transfer (WPT) systems. To implement the wide range DC–DC converter, a Hysteresis triple-mode selector is proposed and designed to effectively adjust the DC–DC converter to operate in one of the three modes: buck, boost or buck-boost, according to the input voltage level. Hysteresis control technique eliminates the unstable state at the mode transition. An output soft start-up circuit is proposed to reduce the inrush current in the switch transistor. A min-max duty generator is introduced to improve the accuracy of DC–DC converter. When the output voltage is too low or too high in comparison to the desired value. The min-max duty generator can control the DC component of the error signal to eliminate the unwanted dead state of the pulse width modulation signal. In addition, only one external inductor is shared between two power stages, thus minimizing the system cost by reducing the external components. The proposed buck-boost DC–DC converter is implemented using 180 nm Complementary Metal-Oxide-Semiconductor (CMOS) technology. The output voltage is regulated to 5 V when the input voltage ranges 3–8 V, and output load current ranges 100–500 mA. The die area is 1.55 mm × 1.14 mm (1.767 mm2). The measured peak efficiency of the buck-boost DC–DC converter is 94.8%.

Published in Energies

ISSN: 1996-1073 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology
Website: http://www.mdpi.com/journal/energies

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