Magnetic sensor device, inverter apparatus, and battery apparatus
AssigneeTDK Corporation
InventorsYuta Saito, Hiraku Hirabayashi
Life of this patent
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Abstract
A magnetic sensor device includes a first detection circuit that generates a first detection signal, a coil through which a feedback current is passed to generate a cancellation magnetic field, a second detection circuit that generates a second detection signal having a correspondence with a value of the feedback current, and a control circuit that controls the feedback current. In a closed-loop operation, the control circuit controls the feedback current so that the first detection signal has a constant value. In an open-loop operation, the control circuit maintains the feedback current at a constant value.
Claims18
A magnetic sensor device comprising:
- a first detection circuit that includes a magnetic detection element configured to detect an applied magnetic field, and generates a first detection signal having a correspondence with a strength of the applied magnetic field;
- a feedback coil through which a feedback current is passed to generate a cancellation magnetic field for cancelling at least part of a target magnetic field that is a magnetic field to be detected;
- and
- a second detection circuit configured to generate a second detection signal having a correspondence with a value of the feedback current, wherein
- the feedback current is controlled so that the first detection signal has a constant value in a first case where a strength of the target magnetic field is greater than a first value and less than a second value, and the feedback current is controlled to be maintained at a constant value in a second case where the strength of the target magnetic field is less than or equal to the first value or greater than or equal to the second value, and
- in the first case, a detected value generated based on the second detection signal has a correspondence with the strength of the target magnetic field, and in the second case, a detected value generated based on the first detection signal has a correspondence with the strength of the target magnetic field.
Dependencies are inferred from the claim text.