CURRENT SENSOR

WIPO Patent Application WO/2014/199654

A1

A current sensor has a magnetic core that has a void and has magnetic flux generated by a current under measurement passed therethrough, a Hall element disposed in the void, a coil for applying magnetic flux to the Hall element, a high-frequency oscillator for applying a high-frequency signal to the coil, an amplifier for amplifying the output of the Hall element, a first low-pass filter for removing the frequency component of the high-frequency signal from the output of the amplifier, a multiplier for multiplying the output of the amplifier and the high-frequency signal, a second low-pass filter for removing the frequency component greater than or equal to the difference between the frequency of the high-frequency signal and the frequency of the current under measurement from the output of the multiplier, a subtractor for subtracting the output of the second low-pass filter from a reference voltage, a control signal generator for generating a control signal from the output of the subtractor, and a current control circuit for controlling the current supplied to the Hall element according to the control signal. The sensor is not affected by temperature variation and is capable of always securing a constant current sensitivity.

JPS5366267	TEMPERATURE DETECTION CIRCUIT
JP7259632	current sensor

SUZUKI TOSHIKAZU (JP)
NISHIMURA HISASHI (JP)

PCT/JP2014/052056

December 18, 2014

January 30, 2014

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JAPAN AVIATION ELECTRON (JP)

G01R19/32; G01R15/20; G01R19/00

JP2012008009A	2012-01-12
JPS51117080A	1976-10-14
JPH1174823A	1999-03-16
JP2000055999A	2000-02-25
JPH11281678A	1999-10-15
JP2006126012A	2006-05-18

NAKAO, Naoki et al. (JP)
Naoki Nakao (JP)

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