| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic element control device that is able to restrict both the temperature dependence of magnetic sensitivity and temperature dependence of the output value of a magnetic element without depending on a control method for an excitation coil.SOLUTION: A magnetic element controller according to the invention applies an alternation signal to a plurality of excitation coils provided on a magnetic material core, detects the wave forms of the pulses of different polarities corresponding to alternating signals from the detection coils provided on the magnetic material core, and controls a magnetic element, which detects a constant magnetic field, at detection intervals of the pulses of the different polarities. This device comprises: a first excitation signal generation part configured to generate a first alternation signal, which is applied to the first excitation coil of the excitation coils; a second excitation signal generation part configured to generate a second alternation signal synchronized with and different in polarity from the first alternation signal, the second alternation signal being applied to the second excitation coil of the excitation coils, which is reverse to the first excitation coil in the winding direction; and a detected-signal comparison part configured to detect a pulse, which is a detection signal with a positive or negative voltage, which is generated by induction electromotive force when the direction of the current of the alternation signal is switched. |
