High Step-Up DC/DC Topology and MPPT Algorithm for Use With a Thermoelectric Generator

  • Laird I
  • Lu D
  • 1

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Abstract

A thermoelectric generator (TEG) is a low-voltage high-current dc power source with a linear V-I characteristic, and therefore, it is desirable to create a power converter with a topology and control method suited to these attributes. Due to the TEG's low voltage, a topology that produces a high step-up gain for a moderate duty cycle is required to reduce voltage and current stresses within the converter. The linear V-I characteristic produces a P-I characteristic with a flatter peak relative to other sources. This can result in large operating point variations while performing maximum power point tracking (MPPT); thus, an algorithm with low steady-state error is desired. This paper presents a novel high step-up dc/dc converter topology operating with a fractional short-circuit MPPT algorithm for use with a 4.2-V, 3.4-A (for matched load at ΔT = 270 °C) TEG module and a converter output of 180 V. Compared to existing high step-up dc/dc converters, the proposed converter achieves higher gain with similar component count. Experimental results are reported to confirm the converter analysis and better performance of the short-circuit MPPT algorithm over the perturb and observe algorithm.

Author-supplied keywords

  • Capacitors
  • DC power conversion
  • DC&#x2013
  • DC-DC power convertors
  • Discharges (electric)
  • Inductors
  • P-I characteristics
  • Switches
  • TEG
  • Topology
  • Windings
  • current 3.4 A
  • current stress reduction
  • high step-up DC-DC topology
  • linear V-I characteristic
  • linear characteristic
  • low-voltage high-current dc power source
  • maximum power point trackers
  • maximum power point tracking
  • moderate duty cycle
  • power converter
  • short-circuit MPPT algorithm
  • steady-state error
  • thermoelectric conversion
  • thermoelectric energy conversion
  • thermoelectric generator
  • tracking
  • voltage 4.2 V
  • voltage reduction

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Authors

  • I Laird

  • D D Lu

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