铌酸锂表面声波谐振器用于甚高频隔离功率转换
Lithium Niobate Surface-Acoustic-Wave Resonator for Very-High-Frequency Isolated Power Conversion
- Virginia Tech（弗吉尼亚理工大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究展示了一种40-MHz铌酸锂SAW谐振器，通过电隔离IDT和布拉格反射镜实现隔离功率转换，达到25.7 W输出功率、93.8%峰值效率和2.17 kV隔离电压，推进了无磁高频功率转换器的发展。
AI中文摘要：
压电器件为高频功率电子提供了一种有前景的无磁替代方案，能够实现紧凑的能量传输并具有固有的电流隔离。在此，我们展示了一种铌酸锂表面声波（SAW）谐振器，它能够实现隔离功率传输，并解决了现有压电器件在功率应用中面临的挑战，包括工作频率、功率传输品质因数（FOM）、功率处理能力和电气隔离。我们针对应用优化的40-MHz SAW谐振器，具有两个电隔离的叉指换能器（IDT）和声学布拉格反射镜，在仅通过背面安装侧进行被动冷却的情况下，实现了25.7 W的输出功率，温升小于15 °C，隔离电压为2.17 kV。在DC-AC功率转换中，我们展示了93.8%的峰值效率、13.47 mW/V$^2$的功率传输FOM以及81.7 W/cm$^3$的峰值芯片功率密度。通过将二极管整流器连接到输出IDT，也展示了DC-DC转换，尽管效率降至52.7%。我们的结果推进了SAW器件作为下一代甚高频、小型化、高密度、无磁、隔离功率转换器的核心组件之一。
英文摘要：
Piezoelectric devices offer a promising magnetic-free alternative for high-frequency power electronics, enabling compact energy transfer with inherent galvanic isolation. Here we demonstrate a lithium niobate surface acoustic wave (SAW) resonator that enables isolated power transfer and addresses the challenges in existing piezoelectric devices for power applications, including operation frequencies, power delivery figure of merit (FOM), power handling, and electrical isolation. Our application-optimized 40-MHz SAW resonator, with the two electrically isolated interdigital transducers (IDTs) and acoustic Bragg mirrors, achieves a 25.7 W output power at a less than 15 °C temperature rise with only passive cooling through the back mounting side, and an isolation voltage of 2.17 kV. In DC-AC power conversion, we demonstrate a peak efficiency of 93.8 %, a power delivery FOM of 13.47 mW/V$^2$ and a peak chip power density of 81.7 W/cm$^3$. DC-DC conversion is also demonstrated by connecting a diode rectifier to the output IDT, despite efficiency degrading to 52.7 %. Our results advance SAW devices as one of the core components for next-generation very-high-frequency, miniaturized, high-density, magnetic-free, isolated power converters.
