Patent ID: 7394264

Claim:
A device for measuring current in an inductor, which device is intended to be connected in parallel with said inductor, having two terminals A and B, comprising: a network in parallel with the inductor and connected to the terminals A and B having a resistor R 2 in series with the combination of a resistor R 1 in parallel with a capacitor C 1 ; a voltage offset circuit having a DC voltage generator E connected in parallel with an offset resistor in series with two resistors in parallel R 3 and R 4 , the positive pole of the generator being connected to the common point of the two resistors R 3 and R 4 and to the common point of the resistor R 1 and the capacitor C 1 of the network intended to be connected to one of the two terminals of the inductor, the negative pole of the generator E being connected to the offset resistor; a temperature compensation circuit comprising a current source controlled as a function of the temperature, one of the two terminals of the current source being connected to the negative pole of the generator E, the other terminal of the current source being connected to different points of the measurement device according to the direction of variation of the current of the source as a function of the temperature; and in that the measurement of voltage Vmes, the image of the current in the inductor, is performed between the common point of the resistors R 1 , R 2 of the network and the common point of the offset resistor and of the two resistors R 3 and R 4 .