Browsing by Author "Takamiya, Makoto"

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Introduction to the December Special Issue on the 2015 IEEE International Solid-State Circuits Conference
(2015-12-01)
Takamiya, Makoto
;
Wu, Jieh-Tsorng
;
Ryynanen, Jussi
;
Okada, Kenichi
;
Kim, Jaeha
Single-Inductor Dual-Input Dual-Output Battery-PV Hybrid System With 2-D Adaptive On-Time Control for Internet of Things
(2020-03-01)
Lee, Hui-Hsuan
;
Liu, Chi-Wei
;
Takamiya, Makoto
;
Chen, Po-Hung
;
電子工程學系及電子研究所
In this article, we present a single-inductor dual-input dual-output power converter with two-dimensional adaptive-on-time (2-D AOT) control for Internet of things (IoT) applications. The proposed system combines energy from a 0.55-0.7 V photovoltaic (PV) module with a non-rechargeable 1.4-V zinc-air battery to extend the battery life. The proposed converter employs the buck-boost mode and the buck mode for the PV module and the battery, respectively, to produce two output voltages for different loading currents. The proposed 2-D AOT technique not only reduces the output voltage ripple but also improves the dual-source conversion efficiency over a wide input voltage range. Moreover, the response time of the self-tracking zero-current detector can also be improved by the proposed 2-D AOT. We fabricated the test chip using 0.18-mu m technology in an area of 1.9 x 2.2 mm(2). The measurement results demonstrated a peak efficiency of 92.5% with an input voltage range of 0.55-1.4 V. The output voltage ripple was less than 2.3% VOUT under different input voltage ranges.