SBAS667F April 2016 – April 2020 AMC1301
Isolated amplifiers are widely used in frequency inverters that are critical parts of industrial motor drives, photovoltaic inverters, uninterruptible power supplies, electrical and hybrid electrical vehicles, and other industrial applications. The input structure of the AMC1301 is optimized for use with low-value shunt resistors and is therefore tailored for isolated current sensing using shunts.
Figure 49 shows a typical operation of the AMC1301 for current sensing in a frequency inverter application. Phase current measurement is done through the shunt resistor, RSHUNT (in this case, a two-pin shunt). The differential input and the high common-mode transient immunity of the AMC1301 ensure reliable and accurate operation even in high-noise environments (such as the power stage of the motor drive).
Additionally, the AMC1301 may also be used for isolated voltage measurement of the dc-link, as described in the Isolated Voltage Sensing section.