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Fluxgate large-current sensor based on digital second harmonic detection and ripple compensation

A second harmonic and ripple compensation technology, applied in voltage/current isolation, measurement using digital measurement technology, instruments, etc., can solve problems such as high requirements for coil winding consistency, increased sensor difficulty and cost, etc. , to achieve the effect of good linearity, high temperature stability, and output ripple suppression

Active Publication Date: 2020-04-10
SHANGHAI TECH UNIV +1
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  • Abstract
  • Description
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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

Method used

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  • Fluxgate large-current sensor based on digital second harmonic detection and ripple compensation
  • Fluxgate large-current sensor based on digital second harmonic detection and ripple compensation
  • Fluxgate large-current sensor based on digital second harmonic detection and ripple compensation

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Embodiment Construction

[0051] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only for illustrating the present invention and are not intended 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 present application.

[0052] System block diagram of the present invention is attached figure 1 shown. There are three coils on the ring magnetic core: coil coil1, coil coil2 and coil 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 DC (low frequency) signal uses the method of flux gate a...

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Abstract

The invention provides a fluxgate large-current sensor based on digital second harmonic detection and ripple compensation, and the sensor is characterized in that the sensor comprises a low-frequencymeasurement coil, a feedback coil, and a high-frequency measurement coil, which are wound on an annular magnetic core. According to the invention, the direct current component and the alternating current component in the current can be measured at the same time. The measurement accuracy is high, the linearity is good, the temperature stability is high, and the beneficial effects are shown as follows: (1) the sensor has digital quantity output and analog quantity output; (2) zero drift digital correction is carried out, and the influence of device output current bias caused by an analog circuitis reduced; and (3) ripple output is inhibited.

Description

technical field [0001] The invention relates to a fluxgate current sensor based on digital second harmonic detection, which belongs to the technical field of electromagnetic detection. Background technique [0002] Current sensors fall into two main categories: those based on Ohm's law of resistance and those based on Faraday's law of electromagnetic induction. Resistive shunts are a current sensor based on Ohm's law. Due to their fast rising speed and large amplitude, they are widely used to measure instantaneous current pulses (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 large measurement noise of conventional resistance shunts, the measurement results have large errors and are unstable. R.Malewski proposed an improved coaxial resistor shunt, which makes the parasitic inductance very small, but the skin effect is obvious. For the measurement of large pul...

Claims

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Application Information

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Patent Type & Authority Applications(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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