CURRENT DETECTION CIRCUIT UNSUSCEPTIBLE TO NOISE

Japanese Patent JP2018040632

A

PROBLEM TO BE SOLVED: To realize a current detection circuit that detects a curent with high accuracy.SOLUTION: A current detection circuit 1 comprises: a resistor 11 on a current path; a first signal transmission unit 12-1 for transmitting a signal that represents the potential on first terminal side of the resistor 11; a second signal transmission unit 13-1 for transmitting a signal that represents the potential on second terminal side of the resistor 11; a first differential computation unit 14-1 for computing a difference between the signals from the first signal transmission unit 12-1 and the second signal transmission unit 13-1; a transmission unit starting point 16 for noise capture provided inside a motor drive device; a third signal transmission unit 12-2 and a fourth signal transmission unit 13-2 connected to the transmission unit starting point 16 for noise capture; a second differential computation unit 14-2 for computing a difference between the signals from the third signal transmission unit 12-2 and the fourth signal transmission unit 13-2; and an addition computation unit 15 for adding the first differential signal and the second differential signal together. The first signal transmission unit 12-1 and the fourth signal transmission unit 13-2 are arranged close to each other, and the second signal transmission unit 13-1 and the third signal transmission unit 12-2 are arranged close to each other.SELECTED DRAWING: Figure 1

TSUCHIDA KUNIO
SASAKI HIROSHI
INABA JUICHI

JP2016173798A

March 15, 2018

September 06, 2016

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FANUC LTD

G01R19/00

JPS61112969A	1986-05-30
JPS5190240A	1976-08-07
JP2001349868A	2001-12-21

WO2003032478A1

2003-04-17

Atsushi Aoki
Jun Tsuruta
Tomohiro Minamiyama
Akira Kawai
Kenichi Nakamura

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