Experimental review of an improving system on wireless power transfer via auto tuning of frequency

Abstract

<span lang="EN-US">Wireless power transfer for electric vehicles is focused because these vehicles cannot run long distance without frequently charging. If these vehicles are charged from outside wirelessly, for example an alternating current (AC) power supply is embed under road, the problem is going to be solved. However, efficiency of wireless power transfer depends on various factors, therefore many contrivances should be considered to realize optimal transfer. In this paper, we focused on frequency of inverter, and created auto tuning system of it in response to the distance of inductors. On this system, frequency was modified automatically by a microcontroller and sensor at the same time position of a load changed. Finally, we confirmed that voltage of light emitting diode (LED) was improved by utilizing our system compared with non-tuning frequency.</span>

Efficient wireless power transfer for a moving electric vehicle by digital control of frequency

“…The optimal frequency 𝑓 opt is determined by (2). The derivation of ( 2) is based on theorm of modern control and a state equation [21], [22].…”

Investigation of 1.5 kW secondary side power controlled method in a inductive wireless power transfer system

“…Nafiaa and Yonis [12] discussed the resonance condition in impedance matching to maintain the maximum efficiency while changing the coupling coefficient. Yamaghuci et al [13] experimental design is discussed while changing the auto-tuning frequency. Alghrairi et al and Onishi et al [14], [15] focused on an asymmetric 4-coil-resonance coupling module with multiple transmitters for high stability, maximum power transfer, and efficiency.…”