ELECTRIC CURRENT SENSOR

WIPO Patent Application WO/2018/181090

A1

This electric current sensor is provided with a magnetic core (20) magnetically coupled with an electric current path (P); a detection coil (Lp) wound on the magnetic core; a self-oscillation circuit (30) connected to the detection coil (Lp); a negative feedback coil (Lc) for canceling out a magnetic flux occurring in the magnetic coil (20) due to an electric current (Ip) flowing in the electric current path (P); a negative feedback electric current output circuit (40) for causing an electric current to flow through the negative feedback coil (Lc) on the basis of an oscillation signal (Q) outputted from a self-oscillation circuit (30); and a gain control circuit (60A) for controlling the gain of a closed loop comprising the detection coil (Lp), the self-oscillation circuit (30), the negative feedback coil (Lc), and the negative feedback electric current output circuit (40). Through the present invention, the gain of the closed loop is made variable by the gain control circuit, and it is therefore possible to prevent an error in a control direction or abnormal oscillation of the self-oscillation circuit.

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HORI TATSUMARO (JP)

PCT/JP2018/011970

October 04, 2018

March 26, 2018

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TDK CORP (JP)

G01R19/00; G01R15/18

JPH1062453A	1998-03-06
JP2013040905A	2013-02-28
JP2014119345A	2014-06-30
JP2013088284A	2013-05-13
JP2012526981A	2012-11-01
JP2016532862A	2016-10-20
CN102788930A	2012-11-21

WASHIZU Mitsuhiro et al. (JP)

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