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A High Dynamic Range GMI Current Sensor
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作者 Aktham Asfour Jean-Paul Yonnet Manel Zidi 《Journal of Sensor Technology》 2012年第4期165-171,共7页
The design and performances of a high dynamic range DC-AC current sensor utilizing Giant Magneto-Impedance (GMI) are presented. The sensor is based on a GMI element with negative feedback. The sensing element is a 30 ... The design and performances of a high dynamic range DC-AC current sensor utilizing Giant Magneto-Impedance (GMI) are presented. The sensor is based on a GMI element with negative feedback. The sensing element is a 30 μm diameter GMI Co-based amorphous wire. It is curled to a toroidal core of 2 cm diameter. A bias magnetic field of about 650 A/m is applied to the GMI element to obtain an asymmetric GMI effect. A strong negative feedback is introduced to ensure linearity in a wide dynamic range. Analog conditioning electronics was fully developed. This includes a square wave oscillator based on an inverter trigger;a peak detector and a high gain amplifier with zero adjust. The GMI element is driven at a 3 MHz frequency and 5 mA peak-to-peak current. The closed-loop operations are investigated and the performances of the sensor are presented. DC current measurements are performed. The sensor exhibits good sensitivity and very good linearity, free from hysteresis, in a wide dynamic range of ±40 A. The sensitivity is about 0.24 V/A and the linearity error is about 0.02% of the full scale (FS). The hysteresis error is smaller than the measurement accuracy. AC current measurements using the developed sensor have also been successfully achieved. The sensor bandwidth in closed-loop was about 1.7 kHz. 展开更多
关键词 GMI current SENSOR negative feedback DC-AC current Measurements
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反馈类型的判断方法
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作者 郝宁生 陆英 《韶关大学学报》 1999年第4期87-91,共5页
反馈类型的判断和引入是电路分析和设计的重点和难点,本文就各种反馈类型的判断方法进行了详细的阐述。
关键词 负反馈 电压反馈 电流反馈 串联反馈 并联反馈 电子技术
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