A High-Efficiency Li-ion Battery Switching Charger with Dual-Path Three-Level Buck Converter

  • Woo Joong Jung Korea university
  • Yun Ho Lee Samsung Electronics
  • Sung Min Yoo Samsung Electronics
  • Tae Hwang Kong Samsung Electronics
  • Jun Hyeok Yang Samsung Electronics
  • Hyung Min Lee Korea University
DOI: https://doi.org/10.23075/jicas.2021.7.4.006
Keywords: Dual-Path, Flying capacitor, Li-ion battery charger, Loop-free calibration, Self-balancing, Three-level buck converter

Abstract

This paper proposes a Li-ion battery switching charger with a three-level DC-DC buck converter adopting a loop-free auto-calibration technique for self-balancing of two flying capacitors. The proposed Li-ion battery switching charger provides four operation modes including trickle, precharge, constant current (CC) and constant voltage (CV) mode as the Li-ion battery voltage level. It is designed by 0.13-μm CMOS BCD process and used 0805 size two flying capacitors of 4.7 μF each and an inductor of 10 μH with a DC resistance (DCR) of 100 mΩ as output components. The core chip size without pads is 3.7 × 3.7 mm2. The measurement verified the proposed loop-free auto calibration scheme and the simulation result shows charging process. The supply voltage is 9 V and the load voltage condition varies 2.7-4.2 V and the maximum load current is 1.5 A. The simulation peak efficiency of constant current mode is 93.2% at 1 MHz switching.

Author Biographies

Woo Joong Jung, Korea university

Woo Joong Jung received the B.S. degree at School of Electrical and Electronics Engineering, Chung-Ang University (CAU), Seoul, Korea, in 2018. He is currently working towards the M.S. and Ph.D. joint degree in electrical engineering from Korea University, Seoul, South Korea. His current research interest includes dc-dc switching converter and power management ICs.

Yun Ho Lee, Samsung Electronics

Yun Ho Lee (S’18) received the B.S. degree in electrical engineering from Inha University, Incheon, South Korea, in 2018, and the M.S. degree in electrical engineering from Korea University, Seoul, South Korea, in 2021, respectively. In 2021, he joined Samsung Electronics Inc., Hwasung, South Korea. His current research interest includes designing power management IC.

Sung Min Yoo, Samsung Electronics

Sung Min Yoo received the B.S. and M.S. degrees in electrical engineering from Sogang University, Korea, in 2010 and 2012. In spring 2012, he joined Samsung electronics. His research interests include analog circuit designs for power electronics and application processor applications and mixed-signal integrated circuit.

Tae Hwang Kong, Samsung Electronics

Tae Hwang Kong (M’14) received the B.S. degrees from Pusan National University, Busan, Korea, in 2008. He received the M.S. degree in electrical engineering from KAIST in 2010 and the Ph.D. degree in electrical engineering from KAIST in 2014. In spring 2014, he joined Samsung electronics. His research interests include analog circuit designs for power electronics and application processor applications, with current emphasis on control methodology, high-frequency switch-mode power converters, multi-phase power converter and mixed-signal integrated circuit.

Jun Hyeok Yang, Samsung Electronics

Jun Hyeok Yang received the B.S. degree from Kyung-Pook National University, Korea, and the M.S. and Ph.D. degrees in electrical engineering from Korea Advanced Institute of Science and Technology (KAIST), Korea, in 2007, 2009 and 2013, respectively. Since 2013, he has been working with Samsung Electronics, Korea. Recently, he is the project leader of the analog IP design group and is in charge of developing power/thermal management circuits and analog security detectors.

Hyung Min Lee, Korea University

Hyung-Min Lee (M’14) received the B.S. degree (summa cum laude) from Korea University, Seoul, South Korea, in 2006, the M.S. degree from the Korea Advanced Institute of Science and Technology, Daejeon, South Korea, in 2008, both in electrical engineering, and the Ph.D. degree in electrical and computer engineering from the Georgia Institute of Technology, Atlanta, GA, USA, in 2014. From 2014 to 2015, he was a Postdoctoral Associate with the Massachusetts Institute of Technology, Cambridge, MA, USA. From 2015 to 2017, he was a Research Staff Member with the IBM T. J. Watson Research Center, Yorktown Heights, NY, USA. In 2017, he joined the School of Electrical Engineering, Korea University, where he is currently an Associate Professor. His research areas include analog/mixed-signal/power-management IC and microsystem design for biomedical, sensor, and Internet of Things applications. Prof. Lee was a recipient of the Silver Prizes in the 16th and 18th Human-Tech Thesis Prize Contest from Samsung Electronics, South Korea, in 2010 and 2012, respectively, and the Commendation Award in the Fourth Outstanding Student Research Award from TSMC, Taiwan, in 2010.

Homepage : https://basic.korea.ac.kr/

Published
2021-09-27
How to Cite
Jung, W. J., Lee, Y. H., Yoo, S. M., Kong, T. H., Yang, J. H., & Lee, H. M. (2021). A High-Efficiency Li-ion Battery Switching Charger with Dual-Path Three-Level Buck Converter. Journal of Integrated Circuits and Systems, 7(4), 27-32. https://doi.org/10.23075/jicas.2021.7.4.006
Issue
Vol 7 No 4 (2021)
Section
Articles