摘要
提出一种可以集成在 SPIC(智能功率集成电路 )内部的高压电压探测器的方法 ,其理论是基于基本的结终端技术中的浮空场限环系统 ,把场限环系统作为表面电压分压器 .在通常的场限环外侧再增加两个环 ,对外侧环电压再一次分压 ,并把最外侧环设计成高压电压探测器 .这样当主结电压上升到一个高压时 ,最外侧的环可以只有几伏到十几伏的变化 ,这样环 (探测器 )上的信号既可以表征主结高电压 ,又可以由低压逻辑电路处理 .以一个 40 0 V的结构为例 ,分析并模拟了这个结构 .结果证明可以有效探测 SPIC的高压并可以集成在 SPIC中 .同时 ,该结构可以与 CMOS和 BCD工艺兼容 。
A novel high voltage detector that can be integrated into SPIC (Smart Power IC) is proposed.The structure is designed on the basis of normal junction terminal technique of FFLR (Floating Field Limiting Rings) system.The field limiting ring as a voltage divider,is used to optimize the surface field.The voltage of main junction increases from 0 to a high value,while the utmost ring is designed to vary within a small range,which can be handled by using low voltage logic circuits.An example of 400V rings system is analyzed and simulated for this structure.The results prove that the high voltage detector can detect high voltage in SPIC.The structure can be integrated into SPIC.Besides,it is compatible with CMOS or BCD(Bipolar CMOS Dmos) technology,without any additional processes required.
基金
国家自然科学基金资助项目 (批准号 :6 9776 0 41)~~
