汽車發電機三相同步整流器設計

Design of Three-phase Synchronous Rectifier for Automotive Alternator

陳志豪(Chi-Hou Chen)

指導教授 ： 陳志維

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2012年)

摘要

本文提出汽車發電機三相同步整流器設計。發電機輸出三相交流電經三相橋式整流轉成直流電，每一次導通都會通過2個二極體，二極體導通約有1.1-1.3 V的電壓降，以目前汽車電力需求1.5 kW，電流可能達到100-150 A，二極體整流電路將損失約300-400 W效率約70%，由於MOSFET導通壓降損失較小，提出同步整流的方式以功率晶體MOSFET取代二極體，減少二極體整流電路所造成損失，提升整流效率93%以上。

關鍵字

三相同步整流 ； 汽車發電機

並列摘要

In this paper, three-phase synchronous rectifier for automotive alternator design is proposed. Output voltage of the traditional automotive alternator is transferred from AC voltage into DC voltage through three-phase rectifier whose current is through two diodes that result in voltage drop of 1.1-1.5 V. The current may reach 100-150 A for automotive power demand of 1.5 kW. The power losses of diode rectifier are about 300 to 400 W and the efficiency of about 75%. Instead of diodes, MOSFETs which are used for rectifier are turn-on as the diode is turn-on. The efficiency of rectifier can be increased to 93% by using synchronous rectifier because the turn-on losses of MOSFETs are significantly less than those of diodes.

並列關鍵字

synchronous rectifier ； alternator

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