Patent ID: 7528594

Claim:
Device ( 1 ) for the detection of direct and/or alternating current comprising: a magnetic core ( 5 ) positioned around at least one current (I)-carrying conductor ( 6 ); a winding ( 10 ), which is circled around said magnetic core ( 5 ); an electrical resistance ( 60 ), which is connected in series to said winding; a voltage source ( 40 ), which is connected to said winding and said electrical resistance, said voltage source supplying a (Vexcit) drive voltage, following which a pick-up current (Jexcit) is generated, said pick-up current circulating in said winding ( 10 ) and in said electrical resistance ( 60 ); amplification means ( 20 ), which are connected to the terminals of said electrical resistance ( 60 ) and generate a first output voltage signal (Vamp 1 ) proportional to the voltage (Vsense) generated at the terminals of said resistance ( 60 ); a feedback adjustment circuit block ( 70 ), which is directly connected between said amplification means ( 20 ) and said voltage source ( 40 ), said feedback adjustment block ( 70 ) detecting said first output voltage signal (Vamp 1 ) and generating a second output signal that is sent to said voltage source, said voltage source inverting said drive voltage (Vexcit) when said circulating current (Jexcit) in said winding ( 10 ) and in said resistance ( 60 ) reaches a preset value.