Patent ID: 9046554
Filing Date: 2015-06-02
Classification: G01R

Abstract:
1. A current sensor comprising: a first magnetic sensor and a second magnetic sensor arranged in a periphery of a current line through which a current to be measured flows, the first and second magnetic sensors outputting first and second output signals, respectively, due to an induction magnetic field applied thereto from the current to be measured, the first and second output signals having respective phases opposite to each other; a first analog-to-digital converter connected to the first magnetic sensor, configured to convert the first output signal and output a first digital signal; a second analog-to-digital converter connected to the second magnetic sensor, configured to convert the second output signal and output a second digital signal; and an operation device connected to the first and second analog-to-digital converters, configured to output an operation value by subjecting the first and second digital signals to an differential operation, wherein the operation device determines that measurement accuracy is low if a difference between a first variation Δ