A Flexible Inductive Coil Tag for Household Two-Wire Current Sensing Applications

• Main Authors: Yu, Sung-Chu, 余松築
• Other Authors: Cheng, Yu-Ting
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/27401910084174541184

碩士 === 國立交通大學 === 電子研究所 === 100 === This thesis will demonstrate a flexible current sensor tag designed with inductive coils for sensing the current in the power cords of household-goods. The design methods for coils with air and NiFe (Ni71% Fe29%) magnetic material are compared. When the sensor is placed in proximity to a wire carrying AC electric current, a induced voltage in the inductive coils proportional to the current being measured and use a previously developed SU-8 flexible technology to reach better proximity to the power cord for maximizing induced voltage output. With three kind of different line widths and turns coil design in an area of 0.5 x 1 cm2, for a 90-turns coil design, the sensor tag can provide a sensitivity of 68.5μV/A for detecting 60Hz electric current in the ampere regime.