Current sensor

A current sensor comprising:

• a first magnetic sensor and a second magnetic sensor which are arranged in a periphery of a current line through which a current to be measured passes and output reversed output signals due to an induction magnetic field from the current to be measured;
• a first analog-to-digital converter which is connected to the first magnetic sensor and converts the output signal of the first magnetic sensor from an analog signal to a digital signal so as to be output;
• a second analog-to-digital converter which is connected to the second magnetic sensor and converts the output signal of the second magnetic sensor from an analog signal to a digital signal so as to be output;
• and
• an operation device which is connected to the first analog-to-digital converter and the second analog-to-digital converter, and outputs an operation value by subjecting the output signal of the first analog-to-digital converter and the output signal of the second analog-to-digital converter to differential operation,
• wherein the operation device determines that measurement accuracy is low, in a case where a variation Δ1 in an output signal O1-2 of the first analog-to-digital converter in second sampling immediately after first sampling with respect to an output signal O1-1 of the first analog-to-digital converter in the first sampling is higher than a threshold Δth and a variation Δ2 in an output signal O2-2 of the second analog-to-digital converter in the second sampling with respect to an output signal O2-1 of the second analog-to-digital converter in the first sampling is higher than the threshold Δth.

A current sensor comprising:

• a first magnetic sensor and a second magnetic sensor which are arranged in a periphery of a current line through which a current to be measured passes and output reversed output signals due to an induction magnetic field from the current to be measured;
• a first analog-to-digital converter which is connected to the first magnetic sensor and converts the output signal of the first magnetic sensor from an analog signal to a digital signal so as to be output;
• a second analog-to-digital converter which is connected to the second magnetic sensor and converts the output signal of the second magnetic sensor from an analog signal to a digital signal so as to be output;
• and
• an operation device which is connected to the first analog-to-digital converter and the second analog-to-digital converter, and outputs an operation value by subjecting the output signal of the first analog-to-digital converter and the output signal of the second analog-to-digital converter to differential operation,
• wherein the operation device outputs, in a case where a variation Δ1 in an output signal O1-2 of the first analog-to-digital converter in second sampling immediately after first sampling with respect to an output signal O1-1 of the first analog-to-digital converter in the first sampling is higher than a threshold Δth and a variation Δ2 in an output signal O2-2 of the second analog-to-digital converter in the second sampling with respect to an output signal O2-1 of the second analog-to-digital converter in the first sampling is not higher than the threshold Δth, a value calculated from the output signal O2-2 of the second analog-to-digital converter during the second sampling as an operation value in the second sampling, and
• the operation device outputs, in a case where the variation Δ1 in the output signal O1-2 of the first analog-to-digital converter in the second sampling with respect to the output signal O1-1 of the first analog-to-digital converter in the first sampling is not higher than the threshold Δth and the variation Δ2 in the output signal O2-2 of the second analog-to-digital converter in the second sampling with respect to the output signal O2-1 of the second analog-to-digital converter in the first sampling is higher than the threshold Δth, a value calculated from the output signal O1-2 of the first analog-to-digital converter during the second sampling as an operation value in the second sampling.