Inductive current measurement circuit for switched mode power supplies uses negative impedance differential input operational amplifier in shunt inductance resistor circuit

摘要

A low loss inductive current measurement circuit uses an inductance (2) resistance (3) series circuit (1) in shunt with measurement circuit comprising another inductance (5) resistance (6) series circuit (4) with similar time constant and a low or negative impedance current sink coupling circuit (7) with differential input operational amplifier.