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Exciting circuit of flux gate sensor

A fluxgate sensor and excitation circuit technology, applied in the direction of logic circuit connection/interface layout, pulse shaping, etc., can solve problems such as difficulty in resonance adjustment, and achieve the effect of reducing residual magnetic error, reducing power consumption, and facilitating adjustment

Inactive Publication Date: 2009-12-16
SHANGHAI AIDENGBAO ELEVATOR JIANGSU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of difficult resonance adjustment in the prior art, the present invention provides a fluxgate sensor excitation circuit, which uses electronic circuits to integrate and differentiate square wave signals to obtain triangular wave and spike signals, and then add them to obtain a The triangular wave voltage signal with a sharp pulse at the peak is used as the excitation signal of the fluxgate

Method used

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  • Exciting circuit of flux gate sensor
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  • Exciting circuit of flux gate sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Fluxgate sensor excitation circuit containing inverting differentiator and inverting amplifier. refer to figure 1 .

[0019] (1) Resistance R 1 , capacitance C 1 and op amp A 1 connected as an inverting integrator;

[0020] (2) Resistance R 2 , resistance R 5 , capacitance C 2 and op amp A 2 connected as an inverting differentiator;

[0021] (3) Resistance R 6 , resistance R 7 and op amp A 5 connected as an inverting amplifier;

[0022] (4) Resistance R 3 , resistance R 4 , adjustable resistance W 1 and op amp A 3 Connected as an adder, the operational amplifier A 3 With power drive capability, the excitation voltage and excitation current generated by the circuit of this embodiment can be output without distortion;

[0023] (5) The input terminals of the integrator and the differentiator are connected together and connected with the input terminal 1 of the square wave signal;

[0024] (6) The output of the integrator and an input termi...

Embodiment 2

[0033] Embodiment 2: Fluxgate sensor excitation circuit with inverter and inverting differentiator. refer to figure 2 .

[0034] (1) Resistance R 1 , capacitance C 1 and op amp A 1 connected as an inverting integrator;

[0035] (2) Resistance R 2 , resistance R 8 , capacitance C 2 and op amp A 2 connected as an inverting differentiator;

[0036] (3) Resistance R 3 , resistance R 4 , adjustable resistance W 1 and op amp A 3 Connected as an adder, the operational amplifier A 3 With power drive capability, the excitation voltage and excitation current generated by the circuit of this embodiment can be output without distortion;

[0037] (4) The input terminal of the integrator is connected with terminal 1 of the input square wave signal;

[0038] (5) Terminal 1 of the input square wave signal passes through the inverter N 1 Connected to the input of the inverting differentiator;

[0039] (6) The output of the integrator and an input terminal R of the adder 3 Co...

Embodiment 3

[0048] Embodiment 3: Fluxgate sensor excitation circuit with non-inverting differentiator. refer to image 3

[0049] (1) Resistance R 1 , capacitance C 1 and op amp A 1 connected as an inverting integrator;

[0050] (2) Resistance R 2 , capacitance C 2 and op amp A 2 connected as an in-phase differentiator;

[0051] (3) The input terminals of the integrator and the differentiator are connected together, and are connected with terminal 1 of the input square wave signal;

[0052] (4) Resistance R 3 , resistance R 4 , adjustable resistance W 1 and op amp A 3 Connected as an adder, the operational amplifier A 3 With power drive capability, the excitation voltage and excitation current generated by the circuit of this embodiment can be output without distortion;

[0053] (5) The output of the integrator and an input terminal R of the adder 3 Connection; the output of the differentiator and the other input of the adder W 1 connect;

[0054] (6) Resistance R 1 , ca...

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Abstract

The invention discloses an exciting circuit of a flux gate sensor, which is characterized in that a method of integration, differential and addition is adopted to switch a square signal into a triangular wave current signal with a sharp pulse at the peak value point in order to serve as an exciting signal of a flux gate. The exciting circuit has two forms, wherein, one form is composed of an integrator, a differentiator and a summator, and the other form is composed of an operational amplifier, two resistors and two capacitors. A differential circuit in the first form comprises three forms of an in-phase differentiator, a phase inverter plus a phase reversal differentiator and a phase reversal differentiator plus a phase reversal amplifier. The exciting circuit can be used for generating the exciting signal of the flux gate sensor and lower the remanence error of the flux gate under the condition of low power consumption; moreover, the exciting circuit does not need to work at tuning state. The invention has the beneficial effects that the remanence error can reach 0.5nT and the power consumption is 42mW after the exciting circuit is shocked by a magnetic-field strength of 10mT.

Description

technical field [0001] The invention relates to an excitation circuit, in particular to an excitation circuit for a fluxgate sensor. Background technique [0002] Remanence error is an additional error caused by the change of remanence of magnetic material after the magnetic sensor is disturbed by a strong magnetic field. Compared with other magnetic sensors, the residual magnetic error of the fluxgate sensor is small, but the residual magnetic error must be further reduced in high-demand applications. Increasing the excitation current can effectively reduce the residual magnetism error of the fluxgate sensor, but it also causes the problem of large power consumption. [0003] Document 1 "Pulse Excitation of Micro-Fluxgate Sensors, IEEE TRANSACTIONS ON MAGNETICS, VOL.37, NO.4, JULY 2001 1988-2000" discloses a narrow pulse excitation method, which can obtain Sufficient excitation current amplitude can effectively reduce the residual magnetic error, but this method reduces t...

Claims

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Application Information

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IPC IPC(8): H03K5/02H03K19/0175
Inventor 刘诗斌崔智军
Owner SHANGHAI AIDENGBAO ELEVATOR JIANGSU
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