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首页> 外文期刊>IEEE Transactions on Power Electronics >A Universal Optimal Drain–Source Voltage Tracking Scheme for Synchronous Resonant Rectifiers in Megahertz Wireless Power Transfer Applications
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A Universal Optimal Drain–Source Voltage Tracking Scheme for Synchronous Resonant Rectifiers in Megahertz Wireless Power Transfer Applications

机译：Megahertz无线电力传输应用中同步谐振整流器的通用最优漏极源电压跟踪方案

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摘要

For wireless power transfer (WPT) in mobile applications, the receiving side is usually embedded inside the devices, which makes the heating issue quite challenging, especially at high operating frequency (such as 6.78 MHz) and high power levels. High-frequency synchronous resonant rectification is expected to significantly reduce the power loss on the receiving side and thus improve the rectifier power density. This article proposes a universal optimal drain-source voltage (ODSV) tracking scheme for synchronous resonant rectifier in megahertz (MHz) WPT applications. The ODSV tracking enables the switches in the synchronous rectifiers work at the same switching operation with that of the diodes in the passive rectifiers. Thus, the soft-switching operation can be maintained with minimized body-diode conduction. A tracking algorithm is then developed to adaptively achieve the optimal operation of the synchronous rectifier under varying loading conditions. Finally, the proposed ODSV tracking scheme is implemented in a GaN-based Class E full-wave synchronous rectifier and tested in an experimental 6.78-MHz WPT system. A dc-dc efficiency of 91.6% is achieved under the output power of 120 W. The efficiency of the synchronous rectifier is 97.0% and the rectifier power density can be as high as 1212 W/in(3).
机译：对于移动应用中的无线电力传输（WPT），接收侧通常嵌入设备内，这使得加热问题非常具有挑战性，特别是在高工作频率（例如6.78MHz）和高功率水平。预计高频同步谐振整流预计将显着降低接收侧的功率损耗，从而提高整流电力密度。本文提出了Megahertz（MHz）WPT应用中同步谐振整流器的通用最佳漏极源电压（ODSV）跟踪方案。 ODSV跟踪使得同步整流器中的开关可以在与无源整流器中的二极管相同的切换操作中工作。因此，可以通过最小化的体二极管传导保持软切换操作。然后开发出跟踪算法以在变化的加载条件下自适应地实现同步整流器的最佳操作。最后，所提出的ODSV跟踪方案在GAN的E类全波同步整流器中实现并在实验6.78-MHz WPT系统中进行测试。在120W的输出功率下实现了91.6％的DC-DC效率。同步整流器的效率为97.0％，整流电源密度可以高达1212W / IN（3）。

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