This article proposes a new digitized modulation scheme suitable for a high-power wireless electric vehicle charger employing an integrated boost multilevel converter (IBMC) as its primary-side converter. Using the proposed modulation scheme, an IBMC can generate a boosted square-wave-shaped ac voltage with a controllable amplitude, enabling it to regulate the power efficiently over a wide load and/or coupling range while achieving zero voltage switching for all switches. This article focuses on the steady-state operating principles of the proposed digitized modulation scheme. Key practical considerations, such as capacitor voltage balancing and semiconductor device selection, are highlighted. To verify the benefits of the proposed modulation scheme, an SAE J2954 WPT2/Z2 compliant wireless EV charger prototype that uses an IBMC as the primary converter is designed and built. 200 V Si MOSFETs are employed in the 12 submodules (SMs) that compose the IBMC. The secondary side employs a passive rectifier, and the power flow is controlled using only the IBMC. This system maintains an efficiency between 90% and 93% when regulating power transfer at 7.7 kW under a 220% variation in coupling factor (i.e., 0.14–0.31) and a 150% variation in battery voltage (i.e., 280–420 V).

中文翻译：

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具有宽 ZVS 工作范围的基于 Si MOSFET 的高功率无线电动汽车充电器


本文提出了一种新的数字化调制方案，适用于采用集成升压多电平转换器 (IBMC) 作为初级侧转换器的高功率无线电动汽车充电器。使用所提出的调制方案，IBMC 可以生成幅度可控的升压方波交流电压，使其能够在宽负载和/或耦合范围内有效调节功率，同时实现所有开关的零电压开关。本文重点介绍所提出的数字化调制方案的稳态工作原理。强调了关键的实际考虑因素，例如电容器电压平衡和半导体器件选择。为了验证所提出的调制方案的优点，设计并构建了一个符合 SAE J2954 WPT2/Z2 标准的无线电动汽车充电器原型，该原型使用 IBMC 作为主转换器。构成 IBMC 的 12 个子模块 (SM) 中采用了 200 V Si MOSFET。次级侧采用无源整流器，并且仅使用 IBMC 来控制功率流。当耦合系数变化 220%（即 0.14-0.31）和电池电压变化（即 280-420 V）150% 变化时，该系统将功率传输调节为 7.7 kW，效率保持在 90% 至 93% 之间。