A quasi-digital frequency-modulated fluxgate current sensor
A current sensor and frequency modulation technology, applied in the direction of voltage/current isolation, etc., can solve the problems of accuracy and sensitivity to be improved, and achieve the effect of large measurement range and high precision
Active Publication Date: 2019-10-11
XI AN JIAOTONG UNIV
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Problems solved by technology
The sensor can basically realize quasi-digital measurement, and it is enough to add a duty ratio measurement device after the measurement, but the measurement method needs to be improved in terms of accuracy and sensitivity
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[0033] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0034] The invention provides a quasi-digital frequency modulation fluxgate current sensor, such as figure 1 As shown, including dual fluxgate probe 1 and self-excited magnetic circuit 2; figure 2 As shown, the double fluxgate probe 1 includes two first magnetic rings 1 and second magnetic rings 4 whose centers are on the same straight line, and the first magnetic ring 1 and the second magnetic ring 4 are respectively wound with a first coil 5 And the second coil 6, wherein the winding direction of the first coil 5 and the second coil 6 is opposite, the first magnetic ring 3 and the second magnetic ring 4 are all made of cobalt-based amorphous alloy magnetic material, and its initial magnetic permeability U i ≥80000, the maximum permeability U max ≥300000, saturation magnetic induction B s =0.55, coercive forcer >0...
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The invention discloses a quasi-digital frequency modulation flux gate current sensor. The quasi-digital frequency modulation flux gate current sensor comprises a double flux gate probe, wherein a self excitation circuit is connected with an upper flux gate probe, the double flux gate probe comprises a first magnetic ring and a second magnetic ring of which two circle centers are on one straight line, the first magnetic ring and the second magnetic ring are respectively wound with a first coil and a second coil, the winding direction of the first coil is opposite to the winding direction of the second coil, the self excitation circuit is a hysteresis comparison circuit and comprises an operational amplifier and a self excitation circuit, and the first magnetic ring and the second magnetic ring are connected in parallel between an anti-phase input end and an output end of the operational amplifier. The quasi-digital frequency modulation flux gate current sensor is advantaged in that not only can measurement precision and sensitivity be guaranteed, but also quasi-digital measurement requirements can be further satisfied.
Description
technical field [0001] The invention belongs to the technical field of current measurement, relates to a quasi-digital frequency-modulated fluxgate current sensor, and in particular to a quasi-digital frequency-modulated fluxgate current sensor. Background technique [0002] Current measurement plays a vital role in the power system; non-contact current measurement technology can guarantee personal safety without affecting the stable operation of the power system, and has broad development prospects in the power industry. Traditional non-contact current measurement technologies include Hall current sensors, Rogowski coils, fluxgate sensors, magneto-impedance effect magnetic sensors, etc. Among them, the fluxgate current sensor has the advantages of high sensitivity, high precision and low power consumption, and has a good development prospect in the field of current measurement. [0003] Most of the signal modulation methods used by the existing fluxgates are amplitude modu...
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IPC IPC(8): G01R15/18G01R15/20
Inventor 刘懿莹虞珂曹建安科翰王心怡娄昊
Owner XI AN JIAOTONG UNIV