Evaluating Piezoelectric Materials for Power Conversion
Evaluating Piezoelectric Materials for Power Conversion
复制标题
评估用于功率转换的压电材料
作者：
J. D. Boles;Pedro L. Acosta;Y. Ramadass;J. Lang;D. Perreault
压电储能在电力转换中具有多种潜在优势；它提供非常高的功率密度和效率能力，特别是与小规模的磁性材料相比。转换器架构的开发是为了有效利用压电器件，但没有选择压电器件本身的基本标准。在本文中，我们假设实际转换器运行，根据可实现的效率和功率密度得出电力电子中压电材料的品质因数。然后，我们应用这些指标来评估 51 种市售 PZT 压电材料，并确定有前途的候选材料。这些品质因数及其相关的几何条件可作为高效率、高功率密度压电谐振器设计的指南，我们在 LTSpice 中对此进行了演示和验证。在机械效率和物理限制都受到限制的情况下，压电器件表现出对于小型化功率转换有利的缩放特性。
Piezoelectric energy storage has several potential advantages for use in power conversion; it offers very high power density and efficiency capabilities, especially compared to magnetics at small scales. Converter architectures have been developed for efficient utilization of piezoelectrics, but without fundamental criteria for selecting the piezoelectric devices themselves. In this paper, we derive figures of merit for piezoelectric materials in power electronics based on achievable efficiency and power density, assuming realistic converter operation. We then apply these metrics to evaluate 51 commercially-available PZT piezoelectric materials and identify promising candidates. These figures of merit and their associated geometry conditions serve as guidelines for high-efficiency, high-power density piezoelectric resonator design, which we demonstrate and validate in LTSpice. With both mechanical efficiency and physical limits constrained, it is shown that piezoelectrics demonstrate favorable scaling properties for miniaturized power conversion.