CAJ | 학술논문

在分析超声换能器阻抗特性和电路匹配的基础上，对传统纯电感电容匹配电路模型进行电路仿真和阻抗分析，证明该模型在谐振频率附近有大范围的电抗变化，存在电路不稳定和电阻调节精度低的问题；提出“电感-变压器”阻抗匹配模型，通过电感和变压器分别调节换能器电阻和电抗，实现电路的精确匹配，以提高超声换能器阻抗匹配的精度和稳定性，并给出了理想的匹配条件和匹配参数。利用匝数可调的变压器和电感制作了超声换能器的匹配电路，对20.8 kHz的变幅杆换能器进行了阻抗匹配的实验测量，结果证明这种“电感-变压器”阻抗匹配模型在谐振频率附近具有较小的电抗变化范围、较低的电阻变化率和较高的电抗调节精度，在超声换能器的自动阻抗匹配中具有良好的应用前景。
재분석초성환능기조항특성화전로필배적기출상，대전통순전감전용필배전로모형진행전로방진화조항분석，증명해모형재해진빈솔부근유대범위적전항변화，존재전로불은정화전조조절정도저적문제；제출“전감-변압기”조항필배모형，통과전감화변압기분별조절환능기전조화전항，실현전로적정학필배，이제고초성환능기조항필배적정도화은정성，병급출료이상적필배조건화필배삼수。이용잡수가조적변압기화전감제작료초성환능기적필배전로，대20.8 kHz적변폭간환능기진행료조항필배적실험측량，결과증명저충“전감-변압기”조항필배모형재해진빈솔부근구유교소적전항변화범위、교저적전조변화솔화교고적전항조절정도，재초성환능기적자동조항필배중구유량호적응용전경。
Based on the analyses of impedance characteristics and matching circuit of ultrasound transducer, it is found that with the traditional inductance capacitance matching circuit, a wide range of reactance variation around the reso-nant frequency appears and causes the circuit stability and regulatory accuracy reduced. Therefore, a ‘transfor-mer-inductance’ matching model is proposed in this paper. The reactance and resistance can be regulated by the ad-justable inductance and transformer to improve the precision and stability of the matching circuit for ultrasonic trans-ducer, and the ideal matching condition and parameter are provided. In experiments, with the controllable transformer and inductance, a matching circuit is developed for an ultrasonic horn transducer with the center frequency of 20.8 kHz. It is proved that the matching circuit has a narrow impedance variation range with high reactance regulatory ac-curacy when the frequency is close to the resonance, which provides application potential in automatic impedance matching of ultrasonic transducer.