Texas Instruments has introduced what it claims is the first zero-drift hall-effect current sensors.
The TMCS1100 and TMCS1101 allow for the lowest drift and accuracy over time and temperature while providing 3 kVrms isolation. This is important for AC or DC high-voltage systems such as industrial motor drives, solar inverters, energy-storage equipment and power supplies.
The sensors are used in industrial systems that require more precise current measurement as well as reliable operation. The sensors allow design engineers to provide consistent performance and diagnostics over a longer device lifetime, keeping its solution size compact without increasing design time, TI said.
The zero-drift architecture and real-time sensitivity compensation enable performance even under operational conditions such as temperature changes and equipment aging. The sensitivity drift over temperature is 0.45% maximum, which TI said is at least 200% lower than other magnetic current sensors and a maximum full-scale offset drift of less than 0.1%.
The TMSC1100 and TMCS1101 eliminates the need for device calibration, reducing equipment maintenance over time, TI said. Additionally, the sensors provide inherent galvanic isolation capable of delivering 3 kVrms of 60 second isolation per the Underwriters Laboratories' 1577 standard for environmental conditions in grid-connected or power systems.
