同步整流降壓轉換器之驅動器的研究

Study on the Driver of Buck Converter with Synchronous Rectification

侯志英(Chih-Ying (Jasper) Hou)

指導教授 ： 賴炎生

國立臺北科技大學/機電學院/電機工程系所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00614

摘要

本文針對同步整流降壓轉換器之下橋驅動器為研究方向。研究四種同步整流器之下橋金氧半場效電晶體的驅動電路，這四種驅動電路包括：一般驅動、交流驅動、交流箝位驅動及負電壓直接驅動。並且研究盲時時間對轉換效率的影響。
從實驗結果中可以確認，於轉換器規格為：輸入電壓為 19 V、輸出電壓為 1.25 V、輸出電流為1 A至12 A及切換頻率為300 kHz。由實驗結果顯示，交流箝位驅動方式的效率較其它的驅動方式高，並且在增加金氧半場效電晶體之汲極與閘極間的寄生電容實驗中，以交流箝位驅動及負電壓直接驅動的方式相較於一般驅動方式，使得轉換效率提升1.5 %以上。

關鍵字

降壓轉換器 ； 金氧半場效電晶體 ； 驅動器

並列摘要

The main theme of the thesis is to study on the driver of buck converter with synchronous rectification. Four kinds of driver circuits for low-side MOSFET of buck converter with synchronous rectification are investigated. These driver circuits include conventional driver, AC driver, AC driver with clamping circuit, and negative voltage direct driver. Moreover, the effect of dead time on converter efficiency is investigated in this thesis.
Experimental results are presented for confirmation. The specifications of the test converter include: input voltage = 19 V, output voltage = 1.25 V, rated current = 12 A and switching frequency = 300 kHz. Experimental results show that AC driver with clamping circuit is superior to the others for providing the highest efficiency. AC driver with clamping circuit and the negative voltage direct driver improve the efficiency up to 1.5 % as compared to conventional driver as the parasitic capacitor between gate and drain of MOSFET increases.

並列關鍵字

Buck Converter ； MOSFET ； Driver

參考文獻

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