大功率超声换能器匹配技术研究

Research on Matching Technology of High Power Ultrasound Transducer

在电源与超声换能器间,匹配电路起纽带和桥梁作用。大功率超声系统能否正常工作,取决于匹配电路的设计。该文从大功率超声换能器的阻抗特性和实际工作条件出发,对换能器匹配技术进行了研究,提出了一种电容、电感串、并联结合的匹配电路,以及一种可对匹配电感值进行在线调节的新型电路结构。经过ADS仿真和实际工作验证,大功率超声换能器在这种匹配电路下可长时间稳定地工作,且调试上更方便快捷。

The matching circuits play the roles of ligament or bridge between the power supply and the ultrasound transducer.Whether the high power ultrasound system can work normally highly depends on the designing of the matching circuits.This paper discusses from the impedance of the high power ultrasound transducer and the actual work condition,studies the matching technology of the transducer,and advances a series-parallel connective matching circuit with capacitance and inductance.We also advance a new circuit structure which can adjust the value of the matching inductance on-line.ADS emulation and actual work shows that the high power ultrasound transducer can work steadily for a long time with this matching circuit,at the same time,we reduce the work of debugging.