Wireless power transfer (WPT) offers the advantages of convenience, safety, low-maintenance, high reliability, and strong adaptability to the environment. This study proposes a design method to help LCC/S compensation topology achieve zero voltage switching (ZVS), which helps improve the efficiency of the system. The optimisation design of the magnetic coupling structure is conducted first via the finite element simulation software, ANSYS Maxwell. Planar circular coil offers superior comprehensive performance over other structures and is thus utilised in this study, which theoretically analyses the primary characteristics of LCC/S (primary inductor-capacitor-capacitor, secondary series) compensation topology. The study makes an in-depth comparison of two methods for achieving ZVS, adjusting secondary series compensation capacitance, and making a primary T-type network asymmetric. The conclusions of the theoretical analysis indicate that making a primary T-type network asymmetric is the most suitable method for the proposed WPT system. A 400 W prototype was built, and it consistently achieved ZVS operation within the entire load range (5–50 Ω). The highest power transfer efficiency (PTE) achieved by the prototype was 92.9%, and the PTE was consistently above 88% within the entire power range (50–400 W).

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Analysis, design, and optimisation of an LCC/S compensated WPT system featured with wide operation range

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