Noise Analysis and Suppression in Fluxgate Electronics
Aiming at the problem of noise signal interference in the electronics unit of the fluxgate sensor,the effect of the in-troduction of noise signals related to the detection target frequency through the power supply ground crosstalk on the sensing and feedback signals when the MOSFET,a power device present in the fluxgate excitation circuit,is turned on and off at the frequency of the square-wave switching signal was analyzed,and a new type of noise filtering circuit was proposed to reduce the noise level.The circuit simulation results and the practical application of the noise reduction circuit test results show that the noise amplitude level is significantly reduced,the filter circuit can play an obvious role in suppressing the noise signal,and in the induction and feedback signals related to the excitation frequency,harmonic noise is effectively filtered out,and the similarity with the high-per-formance fluxgate magnetic measurement data improves from the original 0.918 to 0.986,verifying the noise reduction circuit is effective in improving the overall magnetic measurement level of the fluxgate sensor.
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