Device for electric current measurement drawn from the source by sine inverters

摘要

In series with the wire connecting the source (1) of DC voltage and the measured inverter (2) is connected the measuring resistor (3), wherein the measuring resistor (3) is connected in parallel to inputs of the instrumentation amplifier (4), which is fed with symmetrical voltages and its output is connected to the active filter (5) of the fourth-order Chebyshew approximation and the output of filter (5) is connected to the measuring input of the differential analog-digital converter (6), wherein the digital signal at the output of the transmitter (6) is further connected to the singlechip microprocessor (7), which output is connected to a display (8).