CURRENT DETECTING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a current detecting circuit equipped with a correcting means for the offset quantity of an operational amplifier by using a general operational amplifier having relatively low dielectric strength characteristics. SOLUTION: This current detecting circuit which outputs an output voltage V0 corresponding to a current I flowing to a current detection resistor Rcs is equipped with the current detection resistance Rcs, a DC reference voltage circuit 25 which can sets the operation point Vd of the output voltage V0, and a 1st converting circuit 21 which inputs a potential difference signal (V1-V2) generated corresponding to the two-way current I flowing to the current resistor Rcs and the reference voltage Vd of a DC reference voltage circuit 25 and outputs the voltage signal V0 obtained by adding the reference voltage Vd of the DC reference voltage circuit 25 setting the operation point Vr to the amplified potential difference signal G1 (V1-V2).