高功率突波抑制器順向偏壓之降低

Abstract

本論文針對車用發電機整流系統提出一新型功率整流二極體，其包含順向整流功能與逆向突波抑制功能之二極體元件。此元件將傳統蕭特基整流、與傳統PN二極體整合成單一元件。其於順向電流下利用蕭特基整流接面，可具有低順向壓降，不僅可改善整流轉換效能；並且利用PN二極體具吸收逆向突波之功能，以保護車用發電機整流系統因電感所引發之逆向突波。 文中提出經由模擬參數設計與實際半導體製程製作元件，以得到符合車用逆向崩潰電壓24伏電壓系統之功率整流二極體元件。最後實驗製作之元件，經由測試結果顯示，於順向電壓於電流密度380安培/平方公分測試條件下，可具有小於0.8伏之低順向電壓，並且200度高溫逆向電壓18伏下，漏電流密度小於87 mA/平方公分；並可符合逆向突波測試能力規範。

In this thesis, a novel power diode is proposed which includes forward rectifying function and reverse transient voltage suppressor function for auto alternator rectifier system. It is based on the integration of a conventional Schottky rectifier and conventional PN diode. It can not only with a low forward voltage drop in forward current by using Schottky contact to improve power loss but also using PN diode to absorb the reverse transient surge of inductive coil induced to protect auto alternator rectifier system. Base on the simulation of design parameter, use semiconductor process to fabricate actual device. Finally, a meet automotive 24V voltage system prototype device is constructed. Experimental results show that the forward voltage drop is smaller than 0.8V under forward current density 380A/cm2 testing condition. The reverse leakage current density is smaller than 87mA/cm2 under 200℃reverse testing voltage 18V testing condition. And reverse surge tested, the device meet reverse surge capability spec.