Abstract
Adding a core to a coupling coil can improve transmission efficiency. However, the added core causes the self-inductance of the coupling coil to increase at a high temperature due to the temperature-sensitive property of the core material’s permeability. The self-inductance increases, causing the resonance frequency to shift down, thereby decreasing the output power. The 3 dB bandwidth of the system can learn of the correspondence between the output power and the resonance frequency. In order to make sure that the output power does not excessively decrease at a high temperature, this study employs a simulation for the LCC-S-based wireless power transfer system. Adding a minor resistance to shift down the lower cutoff frequency ensures that the resonance frequency yielded by the temperature rise can be higher than the lower cutoff frequency, making the output power higher than half of the maximum. Then, an adjustment on the compensation capacitances on the resonant circuit elevates the output power more. The outcomes are consistent with the prediction. Adding the core to the coupling coil improves transmission efficiency; increasing the bandwidth of the system excessively decreases the output power decline at a high temperature for the temperature-sensitive core material permeability.
Highlights
Adding a core to a coupling coil increases the transmission efficiency of a wireless power transfer system [1,2,3], but this effect decreases at high temperatures [4]
AcAcAoccrccdooirrnddgiinntgog tEtooqEuEqaqutuiaoatntiiosonn(4ss)((4a4)n)adann(d1d0(()11,00i)t),iisittifisosuffonoudunntdhdatththatahtteththoeeuotopuuutpttpuputotpwpooewwreaernradannmddummtuuuatutluaall indiinundcdutuacncttacanencacereeaarpreerpoprporooprpotiorotrintoiaonln;aialn;li;cnirncercaersaeinsaisgnignthgtehtehneunmunmubmebrebroefor tfoutfurtnrunsrsonofsfbobofotbhtohctohcoucupopluilnpinglignccogoilcislossilsismimsuiuml-ltual-tannteaeonouuesoslulyysslseyerrsvveeresvsteotsoitnioncicrnerecaraseesaetshtehetehmmeumututuuatlauilanilndidunucdtcuatncatcnaecn.ecH.eH.oHwoowewveeverve, ret,hrt,ehthseiemsismuimluautlaeladteterdedsrerueslsutuslthltsoshwhooswwss thatththatahttetthhoeeuotopuuuttptpuputotpwpooewwr ederredcdreeeccarrseeeaassseaesssatahssetthhneeunmnuubmmerbbeoerfrotouffrttnuusrrnninssciinrneccarrseeeaasss;eetshs;;etthhreeesrrueeslstuuilslttissihssoshwhoonwwinnninin FigFFuiigrgeuur8re.e88. This is because increasing the number of turns will simultaneously increase the impedance of the coupling coil; the output power will still decrease if the drive voltage maintains the original voltage
The core added to the coupling coil to enhance the transmission efficiency of the wireless power transfer system results in a decrease in the power being supplied to the load, because the temperature coefficient of the core material renders the power output unevenly
Summary
Adding a core to a coupling coil increases the transmission efficiency of a wireless power transfer system [1,2,3], but this effect decreases at high temperatures [4]. AcAcAoccrccdooirrnddgiinntgog tEtooqEuEqaqutuiaoatntiiosonn(4ss)((4a4)n)adann(d1d0(()11,00i)t),,iisittifisosuffonoudunntdhdatththatahtteththoeeuotopuuutpttpuputotpwpooewwreaernradannmddummtuuuatutluaall indiinundcdutuacncttacanencacereeaarpreerpoprporooprpotiorotrintoiaonln;aialn;li;cnirncercaersaeinsaisgnignthgtehtehneunmunmubmebrebroefor tfoutfurtnrunsrsonofsfbobofotbhtohctohcoucupopluilnpinglignccogoilcislossilsismimsuiuml-ltual-tannteaeonouuesoslulyysslseyerrsvveeresvsteotsoitnioncicrnerecaraseesaetshtehetehmmeumututuuatlauilanilndidunucdtcuatncatcnaecn.ecH.eH.oHwoowewveeverve, ret,hrt,ehthseiemsismuimluautlaeladteterdedsrerueslsutuslthltsoshwhooswwss thatththatahttetthhoeeuotopuuuttptpuputotpwpooewwr ederredcdreeeccarrseeeaassseaesssatahssetthhneeunmnuubmmerbbeoerfrotouffrttnuusrrnninssciinrneccarrseeeaasss;eetshs;;etthhreeesrrueeslstuuilslttissihssoshwhoonwwinnninin FigFFuiigrgeuur8re.e88 This is because increasing the number of turns will simultaneously increase the impedance of the coupling coil; the output power will still decrease if the drive voltage maintains the original voltage. The permeability of the core increases with increasing temperature In this simulation, the equivalent coil inductance was 4.64 μH, with a 0.04 μH increment, resulting in the resonance frequency of the system being shifted down by 10 kHz. The simulation results revealed that the bandwidth obtained using a series resistance of 450 mΩ was sufficient to include the new frequency point within the bandwidth. In this simulation, the equivalent coil inductance was 4.64 μH, with a 0.04 μH increment, resulting in for the output power reduces as the series resistance increases. Tahnealaynsiaslyresissurletssusultgsgseusgtegdesttheadttthhaetstyhsetesmystwemill will not produce a bifurcation phenomenon by the addition of the series resistance and adjustment of the capacitances
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
