TY - GEN
T1 - A Single-Inductor Triple-Output Buck-Boost Converter with Output Ripple Control for Wearable Devices
AU - Hsu, Zhi Yun
AU - Liu, Chi Wei
AU - Wu, Jun Wan
AU - Chang, Wei Jen
AU - Li, Tsung Ling
AU - Chen, Po Hung
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This paper presents a single-inductor triple-output (SITO) buck-boost converter for wearable devices. It converts a 2.8V to 4.8V Li-ion battery voltage to three regulated output voltages: 1.2 V, 1.8V, and 3.3V for different back-end circuits, such as digital circuits and analog circuits. The converter operates at discontinuous conduction mode (DCM) and regulates the output using pulse-skip modulation (PSM) to reduce cross-regulation. Furthermore, the converter includes an adaptive on-time (AOT) generator to improve the output power range at low input voltage and control the maximum output voltage ripple under different inputs. Furthermore, three self-tracking zero current detectors (ST-ZCD) provide appropriate off-time periods for power MOSFETs to reduce the reverse inductor current. The measurement results show that the proposed SITO buck-boost converter achieves a maximum peak power conversion efficiency of 75.8% under 315mW output power. In addition, the peak inductor current is well controlled under different input voltages.
AB - This paper presents a single-inductor triple-output (SITO) buck-boost converter for wearable devices. It converts a 2.8V to 4.8V Li-ion battery voltage to three regulated output voltages: 1.2 V, 1.8V, and 3.3V for different back-end circuits, such as digital circuits and analog circuits. The converter operates at discontinuous conduction mode (DCM) and regulates the output using pulse-skip modulation (PSM) to reduce cross-regulation. Furthermore, the converter includes an adaptive on-time (AOT) generator to improve the output power range at low input voltage and control the maximum output voltage ripple under different inputs. Furthermore, three self-tracking zero current detectors (ST-ZCD) provide appropriate off-time periods for power MOSFETs to reduce the reverse inductor current. The measurement results show that the proposed SITO buck-boost converter achieves a maximum peak power conversion efficiency of 75.8% under 315mW output power. In addition, the peak inductor current is well controlled under different input voltages.
KW - adaptive on-time generator (AOT)
KW - DC-DC
KW - single-inductor triple-output (SITO)
KW - zero current detector (ZCD)
UR - http://www.scopus.com/inward/record.url?scp=85142470173&partnerID=8YFLogxK
U2 - 10.1109/ISCAS48785.2022.9937353
DO - 10.1109/ISCAS48785.2022.9937353
M3 - Conference contribution
AN - SCOPUS:85142470173
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
SP - 3575
EP - 3578
BT - IEEE International Symposium on Circuits and Systems, ISCAS 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022
Y2 - 27 May 2022 through 1 June 2022
ER -