A bipolar ±13 mV self-starting and 85% peak efficiency DC/DC converter for thermoelectric energy harvesting

Harald Dillersberger, Bernd Deutschmann*, Douglas Tham

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

This paper presents a novel converter for boosting the low-voltage output of thermoelectric energy harvesters to power standard electronic circuits. The converter can start up from a fully depleted state of the system off a bipolar ±13 mV input and can boost it to output voltages of up to 5 V. The converter comprises two transformers, one for each polarity that are multiplexed between an oscillator (used during startup) and a flyback converter (used during normal operation). To eliminate leakage currents in the input stage, the unused converter is completely turned off at startup and both converters are automatically shut off if the input power is found to be too low. Measurement results of the converter designed in a 180 nm CMOS process demonstrate a peak end-to-end conversion efficiency of 85% and nearly perfect impedance matching over the full input voltage range. This is the first time that a converter for ultra-low bipolar input voltages achieves the same performance as a unipolar converter.
Originalspracheenglisch
Aufsatznummer5501
Seitenumfang11
FachzeitschriftEnergies
Jahrgang13
Ausgabenummer20
DOIs
PublikationsstatusVeröffentlicht - 20 Okt 2020

Schlagwörter

  • Energy Harvesting
  • DC DC converter
  • thermoelectric generator
  • flyback converter

ASJC Scopus subject areas

  • !!Control and Optimization
  • !!Energy (miscellaneous)
  • !!Energy Engineering and Power Technology
  • !!Electrical and Electronic Engineering
  • !!Renewable Energy, Sustainability and the Environment

Fields of Expertise

  • Information, Communication & Computing

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