CURRENT DETECTOR

PURPOSE:To eliminate an influence of an induced voltage to a signal source to be detected, without spoiling a response, by offsetting waveform distortion generated in a circuit to be detected, with respect to an input signal source by a current generating means. CONSTITUTION:A titled detector is provided with a transformer consisting of a magnetic core Cr3 and windings ND1, ND2, and the winding ND1 and the winding ND2 are inserted so as to be in series to a load resistance RP, and in parallel to a power source to be detected EC between A and B, respectively. In this state, in a period in which a magnetic core Cr1 is unsaturated, and a magnetic core Cr2 is unsaturated, no voltage is generated in the windings ND1, ND2 of the magnetic core Cr3 because diodes D21, D22 are in a conductive state. Subsequently, in a period in which the magnetic core Cr1 is unsaturated, and Cr2 is saturated, an output current iL2 flows along a closed circuit of an AC power source Ea the diode D21 the resistance RP the winding ND1 a winding NL2 a diode D12 Ea. Accordingly, when a transformer circuit is inserted in parallel to the power source EC, a strain current which follows an input winding induced voltage does not flow. Accordingly, such problems as heating by the strain current and a damage to the power source EC, etc. are eliminated.