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... shown in Fig. 1, free-space current sensor is a coreless Hall-effect current sensor, and composed only of a primary current carrying conductor, a Hall-effect element and an amplifier circuit. The primary current carrying conductor generates a magnetic field which varies with the current. The magnetic field can be detected by the Hall element, the ...
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... measurement [8], is used to measure the magnetic field density of target point. L from 18 to 24mm Fig. 9 shows a measuring system of current flowing in a straight cable. Experiments are repeat done for ten times as the position of Gauss meter probe changes along the axis of cable. The magnetic field density as function of current is shown in Fig. 10. As the cable is straight, magnetic field can be calculated by (1). In this example, r is the sum of the cable radius and the distance from the top of the Hall probe of Gauss meter CYHT201 to the center of the Hall chip, r=7.15mm, see Fig. 9. The relative deviations are given ...
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... B s , B m and B t are the simulated, measured and theoretical values of the magnetic flux density of the straight cable, respectively. Fig. 11 shows the relative error between the simulation, measured and theoretical values according to (4). B m is the average of each measured magnetic field density. All relative deviations are not higher than ±3% when current changes from 5A to 50A. And the relative deviations between simulation and theoretical values are quite small, less ...
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... that the cross-section area of the conductor used in this experiment is relatively small. It heats remarkably when the current goes high. Due to the thermal drift of the Hall probe of the Gauss meter, the measured values of magnetic flux density will deviate from the true values. The deviations increase with the increasing current. As shown in Fig. 12, the measuring error due to thermal drift is seen as an interferential magnetic field. Its magnetic flux density, db(I) , varies with the current I. The current flows into the terminal (Fig. 12a) and flows out from the terminal (Fig. 12b). According to the Ampere's rule, the magnetic flux density is given ...
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... meter, the measured values of magnetic flux density will deviate from the true values. The deviations increase with the increasing current. As shown in Fig. 12, the measuring error due to thermal drift is seen as an interferential magnetic field. Its magnetic flux density, db(I) , varies with the current I. The current flows into the terminal (Fig. 12a) and flows out from the terminal (Fig. 12b). According to the Ampere's rule, the magnetic flux density is given ...
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... flux density will deviate from the true values. The deviations increase with the increasing current. As shown in Fig. 12, the measuring error due to thermal drift is seen as an interferential magnetic field. Its magnetic flux density, db(I) , varies with the current I. The current flows into the terminal (Fig. 12a) and flows out from the terminal (Fig. 12b). According to the Ampere's rule, the magnetic flux density is given ...
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... on (5)- (7), the way to measure the magnetic flux density can be optimized. Fig. 13. Measuring system for U-shaped ...
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... measuring system for U-shaped conductor is shown in Fig. 13. Fig. 14 shows the magnetic flux density at the target point generated by a conductor of Ø1.3mm as function of current. It can be seen that the green curve obtained by using the above measuring method is very approximate to the simulation result. The relative deviations between the simulation and measured results of each experiment are ...
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... measuring system for U-shaped conductor is shown in Fig. 13. Fig. 14 shows the magnetic flux density at the target point generated by a conductor of Ø1.3mm as function of current. It can be seen that the green curve obtained by using the above measuring method is very approximate to the simulation result. The relative deviations between the simulation and measured results of each experiment are not ...
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... can be seen that the green curve obtained by using the above measuring method is very approximate to the simulation result. The relative deviations between the simulation and measured results of each experiment are not higher than ±3%, see Fig.15. ...
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... above simulation and optimization results are used to a new designed free-space Hall-effect current sensor. And the test model is shown in Fig. 16. Considering the current carrying capacity, a conductor of diameter Ø1.3mm is preferred for the experimental range 0- 10A. Fig. 17 shows the sensitivity of the current sensor, which has been tested for ten times, under d=2mm and L=24mm. The red point represents the average sensitivity. The relative deviations between the measured ...
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... above simulation and optimization results are used to a new designed free-space Hall-effect current sensor. And the test model is shown in Fig. 16. Considering the current carrying capacity, a conductor of diameter Ø1.3mm is preferred for the experimental range 0- 10A. Fig. 17 shows the sensitivity of the current sensor, which has been tested for ten times, under d=2mm and L=24mm. The red point represents the average sensitivity. The relative deviations between the measured values and the average are within ±1.0%, see Fig. 18. Fig. 19 shows the linearity error of the current sensor. The linearity is repeat ...
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... capacity, a conductor of diameter Ø1.3mm is preferred for the experimental range 0- 10A. Fig. 17 shows the sensitivity of the current sensor, which has been tested for ten times, under d=2mm and L=24mm. The red point represents the average sensitivity. The relative deviations between the measured values and the average are within ±1.0%, see Fig. 18. Fig. 19 shows the linearity error of the current sensor. The linearity is repeat measured for 10 times. The linearity error of the current sensor is lower than ±0.6%. Table 2 gives the accuracy of the free-space sensor at ambient temperature of 25℃. The total output error is ±2.6%. A basic accuracy of ±3.0% is realizable for ...
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... a conductor of diameter Ø1.3mm is preferred for the experimental range 0- 10A. Fig. 17 shows the sensitivity of the current sensor, which has been tested for ten times, under d=2mm and L=24mm. The red point represents the average sensitivity. The relative deviations between the measured values and the average are within ±1.0%, see Fig. 18. Fig. 19 shows the linearity error of the current sensor. The linearity is repeat measured for 10 times. The linearity error of the current sensor is lower than ±0.6%. Table 2 gives the accuracy of the free-space sensor at ambient temperature of 25℃. The total output error is ±2.6%. A basic accuracy of ±3.0% is realizable for mass-production. ...
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... Electrical current sensors are well known and find a wide range of applications to the electronics industry [1]. There are a lot of current sensors such as current transformers, shunt resistors and Hall Effect current sensors, etc.234567. Among these current sensors, Hall Effect current sensors have more advantages in good linearity, wide measuring range, high isolation between input and output, relative high accuracy, diverse sensor configurations and applications [5,6,7]. ...
... There are a lot of current sensors such as current transformers, shunt resistors and Hall Effect current sensors, etc.234567. Among these current sensors, Hall Effect current sensors have more advantages in good linearity, wide measuring range, high isolation between input and output, relative high accuracy, diverse sensor configurations and applications [5,6,7]. With the development of the semiconductor integrated circuit industry, Hall IC, which integrates a Hall Effect element and its signal processing circuit in one chip, is also quickly developed. ...
... It has been widely used since it has a lot of advantages, such as high sensitivity, long life, easy installation, low power consumption, high frequency, shockresistant and low cost [8,9]. According to previous studies [7] , the linearity of Freespace Hall Effect current sensor by using a Hall Effect element is not good and its sensitivity is not high enough for industrial applications. In this paper, a higher sensitivity Hall IC is used to improve the linearity and sensitivity of this sensor. ...
Linear Hall IC can be used for the low price open-loop Hall Effect current sensor thanks to its high sensitivity. However, according to the experimental results, its thermal performance is greatly related to the thermal drift coefficient of linear Hall IC and the gain of the amplifying circuit. In this paper, the thermal drift of the zero offset will be improved by two methods. One is to use two Hall ICs, the thermal drift coefficients of which are similar, to build up a differential amplifying circuit to compensate the common thermal drift of the two Hall ICs. Another one is to add a magnetic core for concentrating the magnetic flux. In this way the gain of the amplifying circuit is reduced by increasing the magnetic flux density passed through the Hall IC. Experimental results show that the thermal performance of the optimized current sensor is reasonably improved by the proposed methods. Keywords— linear Hall IC, open-loop Hall Effect current sensor, thermal drift improvement, thermal drift coefficient, amplifying circuit gain.
