公开(公告)号：US5568047A

公开(公告)日：1996-10-22

申请号：US288177

申请日：1994-08-10

申请人： Daniel A. Staver ,  Juha M. Hakkarainen

发明人： Daniel A. Staver ,  Juha M. Hakkarainen

IPC分类号： G01R15/18 ,  G01R11/02 ,  G01R11/42 ,  G01R15/04 ,  G01R19/00 ,  G01R33/00 ,  G05F1/10 ,  H01F38/32 ,  H03F3/45

CPC分类号： H01F38/32

摘要： A current sensor has one signal interface channel including a transformer having a primary winding, a secondary winding and a feedback winding. A magnetic core magnetically couples the primary winding, the secondary winding and the feedback winding. The current sensor further includes a feedback generating circuit responsive to an AC signal in the secondary winding for generating a feedback signal having a continuous polarity supplied to the feedback winding. The feedback signal being effective for maintaining a flux in the magnetic core substantially near zero. The feedback generating circuit is made up of an operational amplifier, such as an amplifier having first and second differential input ports and first and second differential output ports, and a switching assembly designed to generate a compensating AC signal from a DC offset voltage. The compensating AC signal is conveniently coupled to the operational amplifier through the magnetic core.

摘要翻译： 电流传感器具有一个信号接口通道，其包括具有初级绕组，次级绕组和反馈绕组的变压器。 磁芯磁耦合初级绕组，次级绕组和反馈绕组。 电流传感器还包括响应于次级绕组中的AC信号的反馈产生电路，用于产生具有提供给反馈绕组的连续极性的反馈信号。 反馈信号对于将磁芯中的磁通保持基本上接近零是有效的。 反馈产生电路由诸如具有第一和第二差分输入端口的放大器和第一和第二差分输出端口的运算放大器组成，以及设计成从DC偏移电压产生补偿AC信号的开关组件。 补偿AC信号通过磁芯方便地耦合到运算放大器。