In this article, a dynamic zero-voltage switching (ZVS) angle control scheme on the wireless power transfer (WPT) system inverter is proposed by implementing a tuning capacitor. High-frequency (HF) and high-power WPT systems are desired in battery charging applications to reduce the battery charging time. Consequently, the power semiconductor devices are subjected to increased voltage, current, and thermal stresses. In this article, the switching losses in the primary-side inverter of a WPT system are suppressed by realizing the ZVS operation during the battery charging process. A dual-loop control strategy is proposed, which involves traditional phase shift control between the inverter phase legs to maintain constant-current (CC)/constant-voltage (CV) at the output and a tuning capacitor to dynamically tune the ZVS angle. The dynamic tuning of the ZVS angle ensures a minimum reactive power requirement from the input source and, therefore, helps to improve the overall efficiency of the system. Closed-loop simulations of the proposed control strategy are carried out using the piecewise linear electrical circuit simulation (PLECS) simulation software. The proposed control strategy is verified on a 10-W WPT prototype by performing the open-loop experimental validations. The maximum efficiency of the proposed control strategy is found to be $\sim 87 \%$ during the CC/CV charging modes. The improvement of $\sim 10 \%$ in the dc–dc efficiency is achieved with the proposed ZVS control strategy.

中文翻译：

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无线电力传输系统中使用调谐电容器的动态ZVS角度控制的分析和演示

在本文中，通过实现一个调谐电容器，提出了一种在无线功率传输（WPT）系统逆变器上的动态零电压开关（ZVS）角度控制方案。在电池充电应用中需要高频（HF）和大功率WPT系统，以减少电池充电时间。因此，功率半导体器件承受增加的电压，电流和热应力。在本文中，通过在电池充电过程中实现ZVS操作，可以抑制WPT系统的原边逆变器中的开关损耗。提出了一种双环控制策略，该策略涉及逆变器相脚之间的传统相移控制，以在输出端保持恒定电流（CC）/恒定电压（CV）；以及一个调谐电容器，可动态调整ZVS角度。ZVS角度的动态调整可确保从输入源获得最小的无功功率要求，因此有助于提高系统的整体效率。使用分段线性电路仿真（PLECS）仿真软件对提出的控制策略进行了闭环仿真。通过执行开环实验验证，在10 W WPT原型上验证了所提出的控制策略。发现所提出的控制策略的最大效率为 通过执行开环实验验证，在10 W WPT原型上验证了所提出的控制策略。发现所提出的控制策略的最大效率为 通过执行开环实验验证，在10 W WPT原型上验证了所提出的控制策略。发现所提出的控制策略的最大效率为 $ \ sim 87 \％$ 在CC / CV充电模式下。的改进 $ \ sim 10 \％$ 提出的ZVS控制策略可实现dc-dc效率。