Maximum Electrical Power Extraction from Sources by Load Matching

Sigmund Singer, Shlomi Efrati, Meir Alon and Doron Shmilovitz
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Sigmund Singer: School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel
Shlomi Efrati: School of Mechanical Engineering and System Engineering Research Initiative (TAU-SERI), Tel-Aviv University, Tel-Aviv 6997801, Israel
Meir Alon: School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel
Doron Shmilovitz: School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel

Energies, 2021, vol. 14, issue 23, 1-19

Abstract: This paper describes the matching of various loads to sources (including nonlinear ones). The purpose of matching is to extract the maximum available power from the source. This has particular importance for renewable sources and energy-harvesting devices, in which unused energy is just wasted. The main innovations in this paper include (and followed by examples) simplified calculation of the matching parameter for a controllable load and matching by means of a family of power-conservative two-port networks, denoted POPI (Pin = Pout), such as transformers, gyrators, loss-free resistors (LFRs) and series LFRs (SLFRs). An additional innovation described in this paper is a new, simplified model of an HF power amplifier based on the series LFR concept. This model predicts that the efficiency of the HF power amplifier operated under the matched-mode condition can significantly exceed the 50% efficiency limit that is predicted by the conventional model. As HF power amplifiers drive antennas in transmission and some wireless power transfer (which uses radiative techniques) systems, it is clear that the operation of such systems in the matched-mode condition is not restricted to a 50% efficiency limit.

Keywords: maximum power transfer; impedance matching; POPI networks; loss-free resistor (LFR); renewable energy sources; wireless power transfer; HF power amplifier; transmission systems (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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