TY - JOUR
T1 - Triple-Mode, Hybrid-Storage, Energy Harvesting Power Management Unit
T2 - Achieving High Efficiency Against Harvesting and Load Power Variabilities
AU - Li, Jiangyi
AU - Seo, Jae-sun
AU - Kymissis, Ioannis
AU - Seok, Mingoo
N1 - Funding Information:
Manuscript received February 13, 2017; revised May 10, 2017; accepted May 31, 2017. Date of publication September 8, 2017; date of current version September 21, 2017. This paper was approved by Guest Editor Jaeha Kim. This work was supported in part by the National Science Foundation under Grant CCF-1453142 and in part by the Catalyst Foundation. (Corresponding author: Jiangyi Li.) J. Li, I. Kymissis, and M. Seok are with the Department of Electrical Engineering, Columbia University, New York, NY 10027 USA (e-mail: jl3920@columbia.edu, ik2174@ee.columbia.edu, mgseok@ee.columbia.edu).
Publisher Copyright:
© 2017 IEEE.
PY - 2017/10
Y1 - 2017/10
N2 - This paper presents a triple-mode, hybrid storage, energy-harvesting power management unit (EH PMU) that interfaces a photovoltaic cell, a regulated load, and a rechargeable battery. The objective is to maximize the end-to-end conversion efficiency of the EH PMU against temporal mismatch and variabilities of harvesting and load power. To minimize the involvement (charging or discharging) of a battery in the voltage conversion process, the proposed hybrid energy storage employs both battery and capacitor, which increases transient energy buffering capability and reduces the overall power conversion loss. Measurement results with 65-nm test chips show that the proposed EH PMU can achieve up to 2.2 × higher end-to-end conversion efficiency than the conventional dual-mode architectures under testing cases emulating realistic load and harvesting power variabilities. We also devised a framework for the system design to guide capacitor sizing, buffering voltage range selection, and end-to-end efficiency tradeoffs.
AB - This paper presents a triple-mode, hybrid storage, energy-harvesting power management unit (EH PMU) that interfaces a photovoltaic cell, a regulated load, and a rechargeable battery. The objective is to maximize the end-to-end conversion efficiency of the EH PMU against temporal mismatch and variabilities of harvesting and load power. To minimize the involvement (charging or discharging) of a battery in the voltage conversion process, the proposed hybrid energy storage employs both battery and capacitor, which increases transient energy buffering capability and reduces the overall power conversion loss. Measurement results with 65-nm test chips show that the proposed EH PMU can achieve up to 2.2 × higher end-to-end conversion efficiency than the conventional dual-mode architectures under testing cases emulating realistic load and harvesting power variabilities. We also devised a framework for the system design to guide capacitor sizing, buffering voltage range selection, and end-to-end efficiency tradeoffs.
KW - DC-DC converter
KW - Internet of Things (IoT)
KW - energy harvesting
KW - power management
KW - switched capacitor (SC)
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U2 - 10.1109/JSSC.2017.2715827
DO - 10.1109/JSSC.2017.2715827
M3 - Article
AN - SCOPUS:85030320025
SN - 0018-9200
VL - 52
SP - 2550
EP - 2562
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 10
M1 - 8030042
ER -