Inspection circuit for magnetic field detector, and inspection method for the same
AssigneeFujikura Ltd.
InventorYasushi OIKAWA
Life of this patent
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Abstract
An inspection circuit serves as a pseudo circuit of a flux gate-type magnetic element having an excitation coil and a detection coil and inspects a magnetic field detector that detects a magnetic field based on an output of the magnetic element when detecting an intensity of a stationary magnetic field applied to the magnetic element based on a time-resolved magnetic balance type. The magnetic field detector includes: an excitation signal generation unit, a detection signal comparison unit, a feedback signal conversion unit, a feedback signal adjustment unit, a data signal conversion unit, and an excitation signal adjustment unit.
Claims16
An inspection circuit, which serves as a pseudo circuit of a flux-gate type magnetic element having an exciting coil and a detection coil, for inspecting a magnetic field detector that detects a magnetic field based on an output of the magnetic element when detecting an intensity of a stationary magnetic field applied to the magnetic element based on a time-resolution magnetic balance type,
- wherein the magnetic field detector includes:
- an excitation signal generation unit that generates an alternating signal;
- a detection signal comparison unit that detects detection signals of a positive voltage or a negative voltage which are generated in the detection coil by an induced electromotive force when a current direction of an excitation current which is applied to the exciting coil is switched;
- a feedback signal conversion unit that converts a time width between the detection signals of a positive voltage and a negative voltage into voltage information;
- a feedback signal adjustment unit that generates a feedback signal for generating a magnetic field that cancels out the stationary magnetic field which is applied to the magnetic element from the voltage information;
- a data signal conversion unit that outputs the feedback signal as a data signal indicating a magnetic field intensity;
- and
- an excitation signal adjustment unit that generates an alternating current from the alternating signal, and generates the excitation current which is applied to the exciting coil based on the alternating current, and
- the inspection circuit includes:
- an alternating signal adjustment unit, connected to an output of the excitation signal adjustment unit, which inputs the excitation current, as a pseudo signal of the detection signal, to an input terminal of the detection signal comparison unit after an intensity of the excitation current which is output by the excitation signal adjustment unit is adjusted.
An inspection method, which uses a pseudo circuit of a flux-gate type magnetic element having an exciting coil and a detection coil, for inspecting a magnetic field detector that detects a magnetic field based on an output of the magnetic element when detecting an intensity of a stationary magnetic field applied to the magnetic element based on a time-resolution magnetic balance type,
- wherein the magnetic field detector includes:
- an excitation signal generation unit that generates an alternating signal;
- a detection signal comparison unit that detects detection signals of a positive voltage or a negative voltage which are generated in the detection coil by an induced electromotive force when a current direction of an excitation current which is applied to the exciting coil is switched;
- a feedback signal conversion unit that converts a time width between the detection signals of a positive voltage and a negative voltage into voltage information;
- a feedback signal adjustment unit that generates a feedback signal for generating a magnetic field that cancels out the stationary magnetic field which is applied to the magnetic element from the voltage information;
- a data signal conversion unit that outputs the feedback signal as a data signal indicating a magnetic field intensity;
- and
- an excitation signal adjustment unit that generates an alternating current from the alternating signal, and generates the excitation current which is applied to the exciting coil based on the alternating current, and
- the inspection method includes:
- a step of supplying the excitation current which is output by the excitation signal adjustment unit, to an alternating signal adjustment unit connected to an output of the excitation signal adjustment unit;
- and
- a step of inputting the excitation current, as a pseudo signal of the detection signal, to an input terminal of the detection signal comparison unit after an intensity of the excitation current is adjusted by the alternating signal adjustment unit.
Dependencies are inferred from the claim text.