高壓和高頻功率開關放大器用於驅動壓電聲表面波傳感器

Design of Power Switching Amplifier for Capacitive Actuator

潘艾娜(Mariana Myryam Panjaitan)

指導教授 ： 丁 鏞

中原大學/工學院/機械工程研究所/碩士(2021年)

https://doi.org/10.6840/cycu202100986

摘要

本文是針對壓電致動器的電容阻抗和諧振頻率高的問題，探討藉由提高功率放大器輸出之電壓峰值和切換頻率來改善壓電致動器之動態性能。使用柔性切換變流器，將低壓方波產生器串聯共振迴路和高頻升壓變壓器(升壓部分)來增大功率放大器的輸出電壓和提升工作頻率並進行設計分析，測試所開發設計之高壓高頻放大器應用於壓電致動器。以壓電表面聲波換能器做為應用範例，實驗結果顯示針對壓電致動器開發的功率放大器可以實現於工作頻率1.4MHz下輸出功率達約200VA之高功率正弦波波形，有利於致動器於高頻操作下驅動並獲得有效之高輸出電流和電壓。

關鍵字

軟式切換變流器 ； 功率切換放大器 ； 壓電致動器 ； 高頻變壓 器 ； 高頻驅動器

並列摘要

The research aiming at the capacitive impedance and high resonance frequency of piezoelectric actuators, to improve the dynamic performance of piezoelectric actuators through increasing the peak values of the output voltage and switching frequency of power amplifiers are explored. Based on the soft switching inverter, the method that enlarges the output voltage as well as operating frequency of the power switching amplifier through using a low-voltage square wave generator in series with resonance tank circuit and high frequency step–up transformer (voltage booster section) is proposed and analyzed. Utilizing the proposed principled and method, a high-voltage and high-frequency amplifier for driving piezoelectric actuator is developed and tested. The research results of the current development for driving a piezoelectric SAW actuator indicate that the developed power switching amplifier can achieve the power output [200VA] and operating frequency 1.4MHz which are beneficial to operating piezoelectric actuator under high output voltage as well as high-frequency with smooth sinusoidal output current and voltage.

並列關鍵字

Soft Switching inverter ； piezo-actuator driver ； high frequency transformer ； high frequency electric driver

參考文獻

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