壓電式反流器驅動控制電路製作

Design of Piezoelectrical Inverter Actuator

黃鴻勳(Hong-Xun Huang)

指導教授 ： 丁鏞

中原大學/工學院/光機電及資電控產業研發碩士專班/碩士(2007年)

https://doi.org/10.6840/cycu200700098

摘要

中文摘要

本文旨在設計以Rosen-Type壓電變壓器於冷陰極管(CCFL)之驅動控制器。藉由壓電變壓器的高昇壓比和高電能轉換效率的特點，可取代傳統線圈(電磁)式變壓器的匝數比過高造成整體效率降低及散熱慢與電磁干擾大等缺點。所設計之驅動器電路架構部分，主要是採用半橋電路搭配壓電變壓器，利用壓電變壓器之昇壓比特性產生昇壓的效果。利用脈寬調變控制設計來驅動半橋電路，使半橋電路切換時可達到零點電壓切換之效果，以降低功率開關的損失。將半橋電路所產生之可調頻的交流方波訊號，透過電感與壓電變壓器內電容匹配產生一個共振電路，以達到柔性切換進而提高整體效率。最後將該驅動控制器電路實際應用於15吋及7吋冷陰極燈管，驗證其功能。

關鍵詞：冷陰極燈管、壓電變壓器

關鍵字

壓電變壓器 ； 冷陰極燈管

並列摘要

Abstract

The design of driving circuitry for a Rosen-type piezoelectric transformer for cold-cathode fluorescent lamp (CCFL) is studied in this article. By using piezoelectric transformer with the merits of high voltage start-up ratio and high efficiency of energy transmission, the disadvantages of low transmission efficiency and slow heat dissipation rate and EMI due to high turn ratio of the traditional electromagnetic transformer is thus improved.
The driving circuitry is fundamentally designed with the half-bridge inverter. By using the PWM control, the half-bridge inverter of zero-voltage switching (ZVS) is achieved so that it can obtain soft switching to reduce the loss of power switch. Also, a frequency-modulation alternate current square signal is generated through a resonance circuit constructed with an inductance and a capacitor of the piezoelectric transformer. Experiments on a 7-inch and 15-inch CCFL are carried out to verify the performance of the driving circuitry.

Keywords: cold-cathode fluorescent lamp (CCFL), piezoelectric transformer

並列關鍵字

cold-cathode fluorescent lamp (CCFL) ； piezoelectric transformer

參考文獻

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[6] M. Shoyama, K. Horikoshi, T. Ninomiya, T. Zaitsu, and Yasuhiro, “Operation Analysis of the Push-Pull Piezoelectric Inverter,” IEEE, APEC’97, pp.573~578, 1997.

[7] John H. Kahl, “Cold Cathode Fluorescent Lamps (CCFLs) -- A History and Overview,” AI-002, Applications Information, JKL Component Corporation, 1997.