Fluxgate High Current Sensor Based on Digital Second Harmonic Detection and Ripple Compensation

A second harmonic and ripple compensation technology, applied in the direction of voltage/current isolation, measurement using digital measurement technology, instruments, etc., can solve the problems of high requirements for the winding consistency of the magnetic core coil, increasing the difficulty and cost of the sensor, etc. , to achieve the effects of good linearity, high temperature stability and high measurement accuracy

Active Publication Date: 2022-08-02
SHANGHAI TECH UNIV +1
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Problems solved by technology

This has high requirements for the consistency of the magnetic core and the consistency of the coil winding, which increases the difficulty and cost of sensor preparation

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  • Fluxgate High Current Sensor Based on Digital Second Harmonic Detection and Ripple Compensation
  • Fluxgate High Current Sensor Based on Digital Second Harmonic Detection and Ripple Compensation
  • Fluxgate High Current Sensor Based on Digital Second Harmonic Detection and Ripple Compensation

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the application.

[0052] The system block diagram of the present invention is attached figure 1 shown. There are three coils on the Magnetic core: coil1, coil2 and coil3, which are low frequency measurement coil, feedback coil and high frequency measurement coil respectively. The number of turns of the three coils is N 1 , N 2 and N 3 . Among them, the detection of the DC (low frequency) signal uses the methods of fluxgate and second harmonic detec...

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Abstract

The invention provides a fluxgate high current sensor based on digital second harmonic wave detection and ripple compensation, which is characterized in that it includes a low frequency measurement coil, a feedback coil and a high frequency measurement coil wound on a ring magnetic core. The invention can simultaneously measure the DC component and the AC component in the current, and has high measurement accuracy, good linearity and high temperature stability. The beneficial effects are as follows: (1) the sensor has both digital output and analog output; (2) ) Zero drift digital correction to reduce the influence of the output current bias of the device brought by the analog circuit; (3) Suppress the output ripple.

Description

technical field [0001] The invention relates to a fluxgate current sensor based on digital second harmonic detection, belonging to the technical field of electromagnetic detection. Background technique [0002] There are two main categories of current sensors: one is based on Ohm's law of resistance, and the other is based on Faraday's law of electromagnetic induction. Resistive shunt is a current sensor based on Ohm's law, which is widely used to measure instantaneous current pulse due to its fast rising speed and large amplitude (S.Ziegler, R.C.Woodward, H.H.Iu and L.J.Borle, "CurrentSensing Techniques:A Review," in IEEE Sensors Journal, vol. 9, no. 4, pp. 354-376, April 2009.). Due to the high noise of the conventional resistive shunt measurement, the measurement results are inaccurate and unstable. R. Malewski proposed an improved coaxial resistive shunt, which makes the parasitic inductance very small, but the skin effect is obvious. For measuring large pulse current...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/20G01R19/25
CPCG01R15/202G01R19/25
Inventor 叶朝锋薛明雨曹彬魏雨童汪洋
Owner SHANGHAI TECH UNIV
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