CMOS microsystem for AC current measurement with galvanic isolation

Frick, V.; Hébrard, Luc; Poure, P.; Anstotz, F.; Braun, F.

doi:10.1109/icsens.2002.1037335

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…In order to improve the signal to noise ratio of magnetic field measurement systems, many researches were devoted to reduce the offset and the low frequency noise level [3], [4], but few works were carried out to improve the maximal absolute sensitivity of Hall effect sensors. In applications such as contactless AC current measurement [5], the offset of the Hall device is not a limiting factor. On the other hand, improving its absolute sensitivity helps in designing magnetic sensors with a good signal-tonoise ratio.…”

Section: Introductionmentioning

confidence: 99%

Horizontal hall effect sensor with high maximum absolute sensitivity

Kammerer¹,

Hébrard²,

Frick³

et al. 2003

IEEE Sensors J.

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The sensitivity of conventional Hall effect sensors is strongly limited by the well known short-circuit effects. Many researches were devoted to reduce offset and noise but few works were carried out to improve the sensitivity. Here, a new shape of integrated horizontal Hall effect device is presented. This particular shape has been developed in order to minimize the short-circuit effects in the sensor, allowing to reduce its length to width ratio and consequently to reduce its average resistance. Thus the biasing current of this sensor can be significantly increased in order to obtain a higher absolute sensitivity than for conventional devices. Such a Hall effect device needs a specific biasing circuit which is also presented, first in a simple version and second in an improved one. A resolution of ¡ £¢ ¥¤ §¦ has been reached on a bandwidth of © to © with a ¡ £ "! #¢ ¥¤ §$ % sensor biased with a current of ¢ "! & (' $ 0) , the corresponding absolute sensitivity being ¨$ 01 32 ¦ . The maximal absolute sensitivity of a so shaped device can be increased as much as needed by increasing its width-to-length ratio, without loss on the current related sensitivity.

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Section: Introductionmentioning

confidence: 99%

Horizontal hall effect sensor with high maximum absolute sensitivity

Kammerer¹,

Hébrard²,

Frick³

et al. 2003

IEEE Sensors J.

Self Cite

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“…However, the cancellation degree of the common mode perturbation can be reduced depending on the unmatched degree. The mismatch between two sensors can be calibrated by a piecewise linear method or an auto-tuning circuit [ 24 ]. Generally, an extra process cost or an IMC layer is required to increase the sensitivity of the magnetic sensor.…”

Section: Design and Structure Of Current Sensormentioning

confidence: 99%

High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Lee

Hong

Park

et al. 2018

Sensors

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In this paper, we propose a high accuracy open-type current sensor with a differential Planar Hall Resistive (PHR) sensor. Conventional open-type current sensors with magnetic sensors are usually vulnerable to interference from an external magnetic field. To reduce the effect of an unintended magnetic field, the proposed design uses a differential structure with PHR. The differential structure provides robust performance to unwanted magnetic flux and increased magnetic sensitivity. In addition, instead of conventional Hall sensors with a magnetic concentrator, a newly developed PHR with high sensitivity is employed to sense horizontal magnetic fields. The PHR sensor and read-out integrated circuit (IC) are integrated through a post-Complementary metal-oxide-semiconductor (CMOS) process using multi-chip packaging. The current sensor is designed to measure a 1 A current level. The measured performance of the designed current sensor has a 16 kHz bandwidth and a current nonlinearity of under ±0.5%.

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“…The important advantage of yokeless current sensor is the absence of ferromagnetic material, which can be saturated by overcurrent [5]. The integrated yokeless current sensors have limited current range: 5 A sensor of this type is described in [6]. Commercially available yokeless high-current transducers use discrete sensors on both sides of the bus bar [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of External Current on Yokeless Electric Current Transducers

Ripka

Chirtsov

2017

IEEE Trans. Magn.

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Yokeless electric current transducers have compact size, but they are sensitive to external magnetic fields, including those caused by electric currents in their vicinity. It is often believed that this unwanted sensitivity can be effectively suppressed by using a differential sensor. In this paper, we investigate the effect of external current with arbitrary position on busbar differential current sensor. We show the main disadvantage of the differential current sensor: increased sensitivity to currents in the transversal direction, which are not sensed by a single sensor. We analyze by finite element method simulation also the influence of real conductor size and uneven density of ac currents. The results were verified on 1000 A current transducer using a pair of microfluxgate sensors. The realistic suppression of close currents depends on the conductor angular position and in 10 cm distance it can be as low as 50, but it can be corrected if the geometry is known.

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CMOS microsystem for AC current measurement with galvanic isolation

Cited by 7 publications

References 10 publications

Horizontal hall effect sensor with high maximum absolute sensitivity

Horizontal hall effect sensor with high maximum absolute sensitivity

High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Influence of External Current on Yokeless Electric Current Transducers

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