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发明名称
一种过电流继电保护器
摘要
一种能够实现过电流保护的过电流继电保护器,它是利用两级运算放大器:输入信号通过电阻与第一级运放负极相接,同时输出端与负极间即有负反馈电阻又有单方向作用二极管;上级运放与下级运放的负极通过电阻及二极管电连接,下级运放负输入端与输出端即有负反馈电阻又能滤波电容。电压比较器正输入端与输出端间有正反馈电阻。交流输入信号与输出信号之间的传递系数与二极管管压降无关,只与运放特性有关。
申请公布号
CN2143380Y
申请公布日期
1993.10.06
申请号
CN92243699.1
申请日期
1992.12.14
申请人
北京开关厂通用电气自动化研究所
发明人
涂大石;张兴华;李安琪
分类号
H02H3/08
主分类号
H02H3/08
代理机构
代理人
主权项
1、一种过电流继电保护器,在装置电路中,精密线性整流的输出端与比较器正端相接,基准电压源与比较器负端相接,其特征在于:输入端分别通过电阻与第一级、第二级运放的负端相接,一级运放的输出分别由两个回路与负端相接:一个回路为正向接入的二极管,另一回路为反向接入的二极管与电阻串联构成,并且由该回路中二极管正端与电阻的连接点引出输出端,通过电阻与第二级运放负端相接,第二级运放的输出端与负端接入负反馈电阻及滤波电容,第二级运放的输出通过电阻与比较器正端相接。
地址
100020北京市朝外关东店
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