具零電壓切換之相移式全橋直流/直流轉換器的研製

Design and Implementation of Phase-Shift Full-Bridge DC/DC Converter with Zero Voltage Switching

蘇軒毅(Hsuan-Yi Su)

指導教授 ： 賴炎生

國立臺北科技大學/機電學院/機電整合研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00100

摘要

本文主要研製一具零電壓切換之相移式全橋直流/直流轉換器，轉換器開關藉由外加共振電感的方式，達到零電壓導通的特性，因此了降低開關上的切換損失，並利用箝位二極體降低開關所承受之應力及減少有效責任週期的損失，藉此提高轉換器整體效率。同時，探討變壓器匝比與共振電感對於轉換器效率之影響。此外，結合一具有功率因數修正的交流/直流轉換器，進而達到廣泛電壓輸入。
本文所研製之轉換器規格如下：輸入直流電壓為400 V，轉換器輸出為48 V / 16.62 A / 800 W，輸出靜態調節為輸出電壓48 V ± 3 %，當輸出最小電流為1 A，輸出動態調節為輸出電壓48 V ± 3 %，當輸出電流5 A~13.34 A、8.34 A~16.62 A；迴旋率(Slew Rate)為0.5 A/μS，轉換器效率為90 ％ 當輸出為160 W；91 ％ 當輸出為400 W；92 ％ 當輸出為600 W；93 ％ 當輸出為800 W。
由實驗結果証明，在規格內之輸入電壓及負載條件下，各開關元件均能達到零電壓切換導通的特性，輸出暫態規格下輸出電壓最小為47.5 V，最大為49.26 V。此外，亦可滿足單級和雙級在20 %負載條件下，效率達到90 %和80 %之綠色能源規範。

關鍵字

相移式全橋轉換器 ； 零電壓切換 ； 直流/直流轉換器 ； 降壓型轉換器

並列摘要

The objective of this thesis is to design and implement a phase shift full bridge converter with zero voltage switching. The implemented converter achieves zero voltage transition with a resonant inductor to reduce the switching loss. Moreover, the switching stress and circulating loss are reduced by using the clamping diodes; therefore the overall efficiency is improved. Also the effects of the transformer and resonant inductor are discussed in the thesis. Furthermore, the converter is combined with an AC/DC converter with power factor corrector to achieve universal input voltage.
The specifications of converter are as follows: input voltage equal to DC 400 V, output equal to 48 V/16.62 A (800 W), static load regulation equal to DC 48 V ± 3 % (@Imin = 1 A), dynamic load regulation equal to DC 48 V ± 3 % (@Io = 5 ~ 13.34 A, Io = 8.34 ~ 16.62 A), slew rate equal to 0.5 A/μS, converter efficiency equal to 90% @ 160W; 91% @ 400 W; 92% @ 600 W; 93% @ 800 W.
Experimental results show that the power device can achieve zero voltage turn-on, for the specified input voltage and load conditions. The output voltage is well regulated and varied between 47.5 V and 49.26 V. Moreover, the efficiency for single stage and two stage is 90 % and 80 %, respectively. The results confirm that the designed and implemented converter meets the standard of Energy Star.

並列關鍵字

Phase-Shift Full-Bridge Converter ； Zero Voltage Switching ； DC/DC Converter ； Buck Converter

參考文獻

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