一個應用於驅動新型觸控回饋系統之壓電材料致動器的高壓磁滯控制調變D類功率放大器

Abstract

在現今生活中，觸控螢幕裝置已廣泛的出現在我們身邊的許多裝置中，並且由近年各大手機廠的旗艦機種可發現，消費者對於具備大螢幕裝置的需求愈漸提升，因此如何在螢幕使用上改善使用者的操作體驗便成為一個值得開發的研究領域。本論文提出以壓電陶瓷致動器來提供觸控螢幕所需的觸覺回饋，並針對其特性加以研究，設計了一個能提供高電壓、低失真以及高效率的驅動電路用以在適當的操作條件下驅動壓電陶瓷致動器。 上述驅動電路以TSMC 180 nm BCD 製程 (T18HVG2) 實現一個操作在60 V、200 Hz的高壓磁滯控制調變D類功率放大器。此D類功率放大器能達到穩定的70%高能量轉換效率，並產生最低失真為0.0045% THD的輸出訊號，以此作為壓電陶瓷致動器之驅動訊號源。

In today’s life, touch screen technology has widely appeared in many devices around us, observe the flagship models of major mobile phone manufacturers released in recent years and it’s obvious to find that consumers’ demand for large-screen devices has been in-creased year by year. Therefore, the issue of how to improve the user experience of the touchscreen operation becomes a research field worthy of development. In this thesis, pi-ezoelectric actuators are proposed to provide the tactile vibration feedback required for touchscreens, their characteristics are studied and compared with their counterparts. A high efficiency driving circuit that can provide high output voltage and low distortion output signal is designed to provide a proper operating condition for the piezoelectric ac-tuators. This driver circuit implements a proposed high voltage hysteresis control modulation class-D power amplifier operating at 60 V, 200 Hz and is realized with TSMC 180 nm BCD process (T18HVG2). This class-D power amplifier can achieve a stable high pow-er-efficiency performance of 70% and generate an output signal with a minimum distor-tion of 0.0045% THD, which is used as the driving signal source for the piezoelectric ac-tuators.