Frequency and Phase-Shift Control of Inductive Power Transfer for EV Charger with LCCL-S Resonant Network Considering Misalignment
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In inductive power transfer (IPT) systems for electric vehicle applications, the coupling coefficient k and self-inductances of the pads can vary depending on the misalignment and vertical distance due to the presence of loosely coupled pads. Furthermore, the operating frequencies of IPT systems are restricted by a Society of Automotive Engineers standard. These frequencies lead to increases in volt-ampere rating and switching losses. Therefore, this paper proposes a control method for operation in a zero voltage switching region close to the zero phase angle frequency for a low volt-ampere rating considering k and the self-inductance variation in a limited operating frequency range. A mathematical analysis is performed, and the critical coupling coefficients of the proposed control are derived. Simulation and experimental results using a 3.3 kW IPT prototype are presented so as to verify the numerical analysis.
KeywordsInductive power transfer (IPT) Frequency control Phase-shift control SAE J2954 Limited operating frequency
This work was supported by “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Korea. (No. 20184030202190). This work was supported by the Korea Institute of Energy.
- 7.Gao Y, Ginart A, Farley KB, Tse ZTH (2016) Misalignment effect on efficiency of wireless power transfer for electric vehicles. In: Proc. IEEE Appl. Power Electron. Conf. Expo., pp 3526–3528Google Scholar
- 12.Wang C-S, Covic GA, Stielau OH (2001) ‘General stability criterions for zero phase angle controlled loosely coupled inductive power transfer systems’. Proc IEEE Ind Electron Conf 2:1049–1054Google Scholar
- 15.Wireless Power Transfer for Light-Duty Plug-In/Electric Vehicles and Alignment Methodology, Standard SAEJ2954, 2017. http://standards.sae.org/j2954_201711/. Accessed 27 Nov 2017
- 20.Boys JT, Huang CY, Covic GA (2008) Single-phase unity power-factor inductive power transfer system. In: 2008 IEEE power electronics specialists conference. IEEE, Rhodes, pp 3701–3706Google Scholar
- 22.Steigerwald RL (1988) A comparison of half-bridge resonant converter topologies. IEEE Trans Ind Electron 3(2):174–182Google Scholar