Open AccessEfficiency improvement of WPT system using inexpensive auto‐adaptive impedance matching
Author(s) -
Mirzavand F.,
Nayyeri V.,
Soleimani M.,
Mirzavand R.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.3450
Subject(s) - rectifier (neural networks) , impedance matching , wireless power transfer , electronic engineering , electrical impedance , voltage , power (physics) , diode , matching (statistics) , output impedance , engineering , control theory (sociology) , electrical engineering , computer science , physics , mathematics , electromagnetic coil , statistics , stochastic neural network , control (management) , quantum mechanics , machine learning , artificial intelligence , recurrent neural network , artificial neural network
An inexpensive auto‐adaptive impedance matching rectifier for wireless power transfer (WPT) systems is proposed. In most WPT systems, due to environment variations, the received power varies during the time. Owing to nonlinear characteristics of diodes, variation of received power results in impedance mismatch which degrades the efficiency of the system. The proposed rectifier system changes the matching circuit using two switches based on the level of the output voltage. This strategy provides matching in a wide range of power levels and consequently improves the efficiency of the system up to 20%. The proposed rectifier is fabricated and the output DC voltage is measured showing very good agreement with simulation result.