Open AccessCoupling Independent Operation in Wireless Power Transfer System without Ferrite Usage
Author(s) -
Nattapong Hatchavanich,
Sumate Naetiladda,
Anawach Sangswang,
Mongkol Konghirun
Publication year - 2021
Publication title -
international journal of electrical and computer engineering research
Language(s) - English
Resource type - Journals
ISSN - 2791-6677
DOI - 10.53375/ijecer.2021.35
Subject(s) - wireless power transfer , maximum power transfer theorem , electromagnetic coil , ferrite (magnet) , voltage , electrical engineering , materials science , inductive coupling , coupling (piping) , control theory (sociology) , power (physics) , engineering , physics , computer science , control (management) , quantum mechanics , artificial intelligence , metallurgy
The power transfer efficiency and output power of a wireless power transfer (WPT) system are mainly affected by magnetic coupling between the primary and secondary coils. This paper presents a constant-current series-series compensated WPT system. Based on the bifurcation criteria, kcri and Lcri, the splitting zero phase angle (ZPA) frequencies is adopted as the operating frequency. The proposed system remains fully compensated even under coupling variations, and without ferrite. The current and voltage gains at the operating frequency can be estimated through the primary current and voltage. A phase-locked loop circuit is used to track the corresponding ZPA frequency due to the coil positioning variations. Experimental results have shown that the 1-kW of output power with the satisfied efficiency of 96%.