Name
Title | ||
|---|---|---|
A 115× Conversion-Ratio Thermoelectric Energy-Harvesting Battery Charger for the Internet of Things |
Abstract | ||
|---|---|---|
This article presents a high-conversion-ratio (HCR), high-voltage-tolerant (HVT) energy-harvesting battery charger using 0.18-μm standard CMOS for Internet of Things (IoT). To reduce conversion ratio (CR) of inductive power converter and optimize overall power efficiency, the proposed charger cascades a boost converter and reconfigurable charge pump. Different from the high-voltage device, the standard CMOS process has lower parasitic capacitance and on-resistance; therefore, it can reduce switching and conduction loss. The reconfigurable charge pump dynamically changes the number of pumping stages according to the output voltage (V
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OUT</sub>
) by automatic configuration selector (ACS). To manage the limited power from a thermoelectric generator (TEG), the converter works under the discontinuous conduction mode (DCM). The zero-current detector (ZCD) employs an analog comparator with digital offset compensator and digital comparator to control off-time (T
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OFF</sub>
) quickly and accurately. The self-idle constant on-time (SI-COT) and idle mode both control the mechanism, helping to further reduce static power dissipation. As a result, the proposed converter can achieve peak efficiency of up to 76% at a 92× conversion ratio with output power ranging from 10 μW to 1.9 mW. The available input voltage ranges are 40 to 400 mV, and the dual output voltage ranges are 1 to 1.6 V and 2 to 4.6 V for V
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BOOST</sub>
and V
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OUT</sub>
, respectively. |
Year | DOI | Venue |
|---|---|---|
2020 | 10.1109/TCSI.2020.3012599 | IEEE Transactions on Circuits and Systems I: Regular Papers |
Keywords | DocType | Volume |
High-conversion-ratio (HCR),high voltage tolerant (HVT),DC–DC converter,thermoelectric energy harvesting,reconfigurable charge pump | Journal | 67 |
Issue | ISSN | Citations |
11 | 1549-8328 | 0 |
PageRank | References | Authors |
0.34 | 0 | 4 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Ming-Jie Chung | 1 | 5 | 2.24 |
| Tetsuya Hirose | 2 | 183 | 38.44 |
| takahito ono | 3 | 1 | 2.99 |
| Po-Hung Chen | 4 | 65 | 11.24 |