CURRENT DETECTING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a current detecting circuit capable of performing integration by lowering the accuracy of a voltage dividing ratio required for a voltage dividing resistor that converts an input voltage to an amplifying circuit into a positive value corresponding to a negative value even if a voltage across a sense resistor deflects to the negative value. SOLUTION: A reverse input terminal of an operational amplifier 20 is connected to a node N1 of the sense resistor 11 through a resistor R3, and a nonreverse input terminal of the operational amplifier 20 is connected to a node N2 through a resistor 12. A resistor 13 and a DC power source B1 are connected to the nonreverse input terminal. Resistance values of the resistors 12, 13 are adjusted to always correctly maintain the voltage of the nonreverse input terminal of the amplifier 20. COPYRIGHT: (C)2006,JPO&NCIPI