海下超声耦合无线电能传输系统电学阻抗变换技术  

Electrical Impedance Transformation Techniques for an Ultrasonic Coupling Wireless Power Transfer System Under Sea Water

作　　者：许康[1] 陈希有[1] 刘丹宁[1] 

机构地区：[1]大连理工大学电气工程学院,辽宁省大连市116024

出　　处：《中国电机工程学报》2015年第17期4461-4467,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(61371026)~~

摘　　要：压电换能器是常用的电声和声电能量转换器件。根据压电换能器在机电谐振状态下显容性的电学阻抗特征,分别研究发射端和接收端压电换能器的阻抗变换问题。在发射端,着眼于消除换能器的容性无功功率,以减轻发射电源的负担,同时能够根据需要提供发射超声波所需要的有功功率;在接收端,着眼于消除等效输出阻抗的容性虚部,并减小实部,以便当负载电阻变动时,能够获得相对稳定的输出电压。给出实现上述阻抗变换的LC网络结构和参数计算方法,并以天然海水为介质、以压电超声换能器为电声和声电转换器件,搭建水下无线电能传输实验装置,以检验阻抗变换效果。实验结果证明了所提阻抗变换技术的有效性。Piezoelectric transducers are common devices for electricity-sound conversion and sound-electricity conversion. Electrical impedance transformation methods for the transmitting transducer and the receiving transducer were respectively studied, according to the electrical impedance characteristic that the piezoelectric transducer is capacitive when it works under the resonant state. On the transmitting side, electrical impedance transformation was aimed at eliminating capacitive reactive power in order to reduce the burden of the power source and providing active power for emitting ultrasonic waves as required, while on the receiving side, eliminating the capacitive imaginary part and decreasing the real part of the equivalent output impedance were mainly considered, with the purpose of getting relatively stable output voltage when the load resistance changed. Structures of the LC impedance transformation network and calculating methods of the parameters were presented in order to achieve these purposes. To examine the effects, an experimental setup of wireless power transfer system under water was established. Nature seawater was used as the ultrasound medium and piezoelectric ultrasonic transducers were used as devices for electricity-sound and sound-electricity conversions. The experimental results verify the efficiency of the proposed impedance transformation techniques.

关 键 词：无线电能传输 海水 超声波 压电换能器 阻抗变换 

分 类 号：TM46[电气工程—电器]