Inductorless Soft Switching DC-DC Converter with an Optimized Piezoelectric Resonator
Inductorless Soft Switching DC-DC Converter with an Optimized Piezoelectric Resonator
复制标题
具有优化压电谐振器的无电感器软开关 DC-DC 转换器
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
J. Rivas
中科院分区：
文献类型：
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作者：
Weston D. Braun;Zikang Tong;J. Rivas
电感器是电力电子器件小型化的最大障碍之一。几乎所有开关模式转换器拓扑都需要电感电路元件，但电感器相对较大且有损耗。压电谐振器可以在谐振周围提供低损耗的电感阻抗，为替代电感器和提高功率密度提供了可能性。压电谐振器需要高频来实现高功率密度，而现在可以通过宽带隙半导体来实现。在本文中，我们提出了一种由铌酸锂制成的用于功率转换的压电谐振器，与更常用的 PZT 陶瓷相比，这种材料在高频功率转换方面具有多种优势。压电谐振器用于降压DC-DC转换器，无需使用磁性元件即可实现零电压软开关和连续可变转换比。该转换器工作频率为6.3MHz，最大功率输出为30W，效率为92.7%，功率密度为16.7 W/cm3
The inductor presents one of the biggest obstacles in miniaturizing power electronics. Inductive circuit elements are required by almost all switch mode converter topologies but inductors are relatively large and lossy. Piezoelectric resonators can provide an inductive impedance around resonance with low loss, offering the possibility of replacing inductors and increasing power density. High frequencies are needed to achieve high power density with piezoelectric resonators, which is now achievable with wide band-gap semiconductors. In this paper we present a piezoelectric resonator for power conversion fabricated out of lithium niobate, a material that has several advantages for high frequency power conversion compared to the more commonly used PZT ceramics. The piezoelectric resonator is used in a step-down dc-dc converter that achieves zero voltage soft switching and a continuously variable conversion ratio without the use of magnetic components. The converter operates at 6.3MHz and has a maximum power output of 30W at an efficiency of 92.7%, achieving a power density of 16.7 W/cm3