Print Email Facebook Twitter Auto-Resonant Detection Method for Optimized ZVS Operation in IPT Systems With Wide Variation of Magnetic Coupling and Load Title Auto-Resonant Detection Method for Optimized ZVS Operation in IPT Systems With Wide Variation of Magnetic Coupling and Load Author Grazian, F. (TU Delft DC systems, Energy conversion & Storage) Soeiro, Thiago B. (TU Delft DC systems, Energy conversion & Storage) van Duijsen, P.J. (Caspoc Simulation Research, Alphen aan de Rijn) Bauer, P. (TU Delft DC systems, Energy conversion & Storage) Date 2021 Abstract In wireless charging systems, the H-bridge converter's switching frequency is set close to the system's natural resonance for achieving optimized zero voltage switching (ZVS). Variations to the system's natural resonance are commonly tracked by following the changes in the resonant current's polarity, i.e., current zero-crossings. The main implementation challenge is accounting for the time delay between the real monitored current and the final resulting switches’ commutations. This becomes critical at high switching frequencies, particularly when the magnetic coupling and loading vary widely. This paper proposes an auto-resonant detection method that continuously ensures optimized ZVS turn-on with the minimal circulating current over the operable range of magnetic coupling and load. The suggested implementation provides two split variable references for the resonant frequency detection, which adaptatively compensate for the propagation delay based on the resonant current slope. The auto-resonant scheme is benchmarked against the commonly employed method with fixed current detection references. The results highlight the auto-resonant strategy's advantages, namely extended operable range, wider ZVS turn-on region, ease start-up, and improved DC-to-DC efficiency. The auto-resonant features and functionality are verified experimentally with a 200 W low-voltage e-bike wireless charger. Finally, the benefits of the presented method are analytically explored for high-power applications by considering the H-bridge semiconductor losses of a state-of-art 50 kW wireless charging system. Subject ControlH-bridge converterinductive power transferinverterresonant converterssoft-switchingwireless chargingzero voltage switching To reference this document use: http://resolver.tudelft.nl/uuid:aeddf7d0-f6f4-4a17-b792-1d138038e0cb DOI https://doi.org/10.1109/OJIES.2021.3072024 ISSN 2644-1284 Source IEEE Open Journal of the Industrial Electronics Society, 2, 326-341 Part of collection Institutional Repository Document type journal article Rights © 2021 F. Grazian, Thiago B. Soeiro, P.J. van Duijsen, P. Bauer Files PDF 09399232.pdf 10.16 MB Close viewer /islandora/object/uuid:aeddf7d0-f6f4-4a17-b792-1d138038e0cb/datastream/OBJ/view