发明授权
- 专利标题： High accuracy differential current sensor for applications like ground fault interrupters
- 专利标题（中）： 高精度差动电流传感器，适用于接地故障断路器
-
申请号： US13439094申请日： 2012-04-04
-
公开(公告)号： US09081041B2公开(公告)日： 2015-07-14
- 发明人: Andreas P. Friedrich , Andrea Foletto , P. Karl Scheller , William P. Taylor , Michael C. Doogue
- 申请人： Andreas P. Friedrich , Andrea Foletto , P. Karl Scheller , William P. Taylor , Michael C. Doogue
- 申请人地址： US MA Worcester
- 专利权人： Allegro Microsystems, LLC
- 当前专利权人： Allegro Microsystems, LLC
- 当前专利权人地址： US MA Worcester
- 代理机构： Daly, Crowley, Mofford & Durkee, LLP
- 主分类号： G01R33/02
- IPC分类号： G01R33/02 ; G01R15/20
摘要：
A sensor with multiple magnetic field sensing elements for use in current sensing and other applications is presented. In one configuration, the sensor can obtain differential and absolute current measurements of current in current-carrying conductors. When employed in a ground fault interrupter (GFI) application, a first magnetic field sensing element can be used to measure the absolute current flowing in the phase conductor (phase current), a second magnetic field sensing element can be used to measure the absolute current flowing in the neutral conductor (neutral current) and a difference between the phase and neutral currents can be measured by a third magnetic field sensing element or determined from measurements of the first and second magnetic field sensing elements. In another configuration, the sensor can obtain a measure of the difference between currents and/or the sum of currents in current-carrying conductors.