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IEEE journal of solid-state circuits, 2022-06, Vol.57 (6), p.1899-1912
2022
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Details

Autor(en) / Beteiligte
Titel
A High-Efficiency Dual-Polarity Thermoelectric Energy-Harvesting Interface Circuit With Cold Startup and Fast-Searching ZCD
Ist Teil von
  • IEEE journal of solid-state circuits, 2022-06, Vol.57 (6), p.1899-1912
Ort / Verlag
New York: IEEE
Erscheinungsjahr
2022
Quelle
IEEE Xplore
Beschreibungen/Notizen
  • This article presents an auto-polarity thermoelectric energy-harvesting interface circuit based on a single-inductor boost/buck-boost hybrid converter. The power stage is configured automatically as a boost converter for a positive input voltage or a buck-boost converter for a negative input voltage. A collaborative efficiency-improving scheme of frequency selection and maximum power point tracking (MPPT) is implemented for input power ranging from 1 to 800 <inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula>. An improved digital zero-current detection (ZCD) technique with fast searching is proposed to turn off power switches accurately. Dual-polarity cold startup is realized with the aid of a pair of cross-coupled Dickson charge pumps. This work is fabricated with a 0.13-<inline-formula> <tex-math notation="LaTeX">\mu \text{m} </tex-math></inline-formula> CMOS process. From the measured results, the interface starts up from a 140- or −160-mV thermoelectric generator (TEG) voltage. It boosts input voltages ranging from 10 mV to 0.4 V and from −10 mV to −0.4 V to a 1.2-V output voltage. It achieves a peak end-to-end efficiency of 90% with a 0.3-V input voltage or 88% with a −0.4-V input voltage. Moreover, end-to-end efficiencies are higher than 80% for input voltages from 90 mV to 0.4 V and from −110 mV to −0.4 V.

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