The Study of a Fluxgate SPICE Model Based on Schmitt Trigger

Abstract

Current fluxgate sensor probe SPICE models constructed by using arc tangent transfer function method and the diode model in fluxgate sensor simulation had some disadvantages which were non convergence, low simulation accuracy, discontinuously adjusted core characteristics and the model couldn’t simulate the hysteresis characteristic. IO characteristics of Schmitt Trigger was similar to the B-H curve of soft magnetic core in shape, for this reason Schmitt trigger was used to construct fluxgate probe SPICE model. HSPICE was used in simulation. Simulation results shown that this model can simulate the real electrical properties of fluxgate probe accurately. This model can be used for fluxgate sensor interface integrated circuit research and fluxgate sensor application, and provide a reference to judge the performance for fluxgate sensors of which core parameters within a certain range.

SPICE circuit model of voltage excitation fluxgate sensor

“…When there are less data, it can also obtain good results to fit the fluxgate core features, The coil1 can be equivalent to the series connection of time-varying inductance L 11 (i 12 ), hollow inductor L 11 , coil DC resistance R 11 , and then paralleled with the distributed capacitance C 11 . www.ietdl.org we adopt(3) to fit the rise and decline curve data of the core hysteresis loop, respectively, where a, b and c are fitting parameters; the value of c is decided by (4), where i is the excitation current…”

“…The fluxgate SPICE models reported in the literature are all current excitation models [2–9]. When applying current excitation model, its a linear relationship between magnetic field and exciting current.…”

Method for modelling of fluxgate sensor including the geometry influence

“…On the aspect of the magnetic performance of core, the previous reports [2][3][4][5][6][7] focus on the work to set up fluxgate SPICE model using the accurate hysteresis loop of magnetic materials. For the geometry of the sensor, it is usually described with the demagnetisation factor [8].…”