压电超声换能器初级串联匹配新方法  

Novel primary series matching scheme for piezoelectric ultrasonic transducer

作　　者：武剑[1] 董惠娟[1] 张松柏[2] 张广玉[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]黑龙江海事局啥尔滨船检处,哈尔滨150000

出　　处：《吉林大学学报（工学版）》2009年第6期1641-1645,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50674036);哈尔滨市科学研究基金项目(2003AFQXJ004)

摘　　要：在分析超声电源输出变压器的非理想性给压电超声换能器电端匹配带来不良影响的基础上,根据空芯变压器模型理论,提出了一种新型的压电超声换能器初级串联匹配法:取消常规的次级匹配电感,若由输出变压器和换能器所构成的整体负载在换能器机械谐振频率处呈感性,则可通过在输出变压器初级串接一个合适的电容实现功放电路和其负载间的共轭匹配,反之则串联一个合适的电感。性能对比实验表明,该匹配法较传统的次级串联电感匹配法进一步提高了匹配的准确度,能量的传递效果也得到改善。The main reason for the matching performance degradation caused by the output transformer mounted on the ultrasonic generator was analyzed.Then,based on the theory of the air-core transformer model,a novel primary serial matching scheme for the piezoelectric ultrasonic transducer was developed.This scheme eliminates the traditional matching inductor mounted on the secondary coil.If the total load,which is composed of the output transformer and transducer,shows inductive impedance at the mechanical resonance frequency of the transducer,a series-wound suitable capacitor can achieve better performance than the traditional matching inductor-based scheme.Otherwise,a comportable series-wound inductor is needed.As a result of the above treatment,the state of conjugated matching between the supply amplifier and its load is reached.A series of texts demonstrate that,in comparison with the traditional secondary serial inductor matching scheme,the new scheme takes advantage in term of the matching precision and power transmission efficiency.

关 键 词：工程物理学 初级串联匹配法 空芯变压器模型 压电超声换能器 输出变压器 共轭匹配 

分 类 号：TB552[理学—物理]