US 7,525,300 B2
Current measuring device and method
Satoshi Watanabe, Kariya (Japan); and Seiki Sakata, Kariya (Japan)
Assigned to Kabushiki Kaisha Toyota Jidoshokki, Kariya-shi (Japan)
Filed on Aug. 28, 2007, as Appl. No. 11/897,136.
Claims priority of application No. P2006-232677 (JP), filed on Aug. 29, 2006.
Prior Publication US 2008/0125988 A1, May 29, 2008
Int. Cl. G01R 33/00 (2006.01)
U.S. Cl. 324—117R  [324/117 H; 324/126] 8 Claims
OG exemplary drawing
 
1. A current measuring device for measuring the current flowing through each of three conductors, comprising:
first and second coreless current sensors are spatially arranged with respect to the conductors; and
a calculator for calculating the current flowing through each conductor based upon (i) the corresponding output signals from the coreless current sensors, (ii) predetermined mathematical coefficients representing a relationship between a fixed standard current and the output signal from the coreless current sensors for the fixed standard current, and (iii) formula Iu+Iv+Iw=0, wherein Iu represents the current flowing through the first conductor, Iv represents the current flowing through the second conductor and Iw represents the current flowing through the third conductor.