Excitation circuit for a fluxgate sensor

Details Excitation circuit for a fluxgate sensor Excitation circuit for a fluxgate sensor

2005-03-15

2005-03-15

Le, N. (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

Reexamination Certificate

active

06867587

ABSTRACT:
A fluxgate excitation circuit comprises an excitation inductor having a resistance Rsat and an inductance Lsat. Vin is provided by a half bridge converter of MOSFET switches (S1, S2). The excitation inductor is driven so that it enters saturation at the transition as the excitation cycle passes from positive to negative. Thus, a high input rms current value of the excitation circuit can be achieved. Because the excitation inductor is saturated for part of the cycle it may be much smaller than heretofore and have a smaller power supply. Thus, the circuit finds application in small devices.

REFERENCES:
patent: 3791043 (1974-02-01), Russell
patent: 4626781 (1986-12-01), Forkel
patent: 4646015 (1987-02-01), Phillips
patent: 5982253 (1999-11-01), Perrin et al.
patent: 6218831 (2001-04-01), Fowler
patent: 6316931 (2001-11-01), Nakagawa et al.
patent: 6512370 (2003-01-01), James

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