Working Paper Article Version 1 This version is not peer-reviewed

MPPT Circuit Using Time Exponential Rate Perturbation and Observation for Enhanced Tracking Efficiency for a Wide Resistance Range of Thermoelectric Generator

Version 1 : Received: 18 April 2021 / Approved: 19 April 2021 / Online: 19 April 2021 (13:26:24 CEST)

How to cite: Miao, J.; Chen, H.; Lei, Y.; Lv, Y.; Liu, W.; Song, Z. MPPT Circuit Using Time Exponential Rate Perturbation and Observation for Enhanced Tracking Efficiency for a Wide Resistance Range of Thermoelectric Generator. Preprints 2021, 2021040488 Miao, J.; Chen, H.; Lei, Y.; Lv, Y.; Liu, W.; Song, Z. MPPT Circuit Using Time Exponential Rate Perturbation and Observation for Enhanced Tracking Efficiency for a Wide Resistance Range of Thermoelectric Generator. Preprints 2021, 2021040488

Abstract

The thermoelectric generator (TEG) stands out in many energy harvesters due to its simple structure, small size, etc. However, previous studies rarely probe into the influence of TEG internal resistances on extracting maximum power from TEG, and tracking efficiency is limited. By analyzing the relationship between the tracking efficiency and the TEG internal resistances, a time exponential rate perturbation and observation (P&O) technology is proposed to achieve maximum power point tracking (MPPT) for a wide resistance range of TEG. Using the time exponential rate P&O, the MPPT circuit observes the power change by comparing PMOS on-time and perturbs the power by adjusting NMOS on-time exponentially. The MPPT circuit is implemented in a 110nm CMOS process. The tracking efficiency keeps a high level from 98.9 to 99.5%. The applicable range of the TEG resistance is from 1 to 12Ω, which is enhanced at least 2.2 times.

Subject Areas

maximum power point tracking (MPPT); thermoelectric generator (TEG); time exponential rate perturbation and observation (P&O); power modulator

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