Zero-drift Hall-effect current sensors improve HV systems

July 09, 2020 //By Rich Pell
Zero-drift Hall-effect current sensors improve HV systems
Texas Instruments has introduced what it says are the industry's first zero-drift Hall-effect current sensors.

The TMCS1100 and TMCS1101 are designed to address the need for more precise current measurement as a result of ongoing demand for higher performance and reliability in industrial systems. The devices, says the company, enable the lowest drift and highest accuracy over time and temperature while providing reliable 3-kVrms isolation - especially important for AC or DC high-voltage (HV) systems such as industrial motor drives, solar inverters, energy-storage equipment, and power supplies.

The devices are offered as enabling engineers to design systems that will provide consistent performance and diagnostics over a longer device lifetime, keeping solution size compact without increasing design time. Key benefits of the TMCS1100 and TMCS1101, says the company, include the following:

  • Improve system performance with the lowest drift over time and temperature - The zero-drift architecture and real-time sensitivity compensation of the TMCS1100 and TMCS1101 enable extremely high performance, even under operational conditions such as temperature changes and equipment aging. With an industry-leading total sensitivity drift over temperature of 0.45%, maximum, which is at least 200% lower than other magnetic current sensors, and a maximum full-scale offset drift of <0.1%, the devices provide the highest measurement accuracy and reliability across a wide range of current. Further, a 0.5% lifetime sensitivity drift, which is at least 100% lower than other magnetic current sensors, significantly reduces the performance degradation associated with system aging over time.
  • Reduce maintenance with ultra-high accuracy - Additionally, the ultra-high accuracy of the TMCS1100 (1%, maximum) and TMCS1101 (1.5%, maximum) eliminates the need for device calibration, which reduces equipment maintenance over time. The devices also provide typical linearity of 0.05%, which minimizes signal distortion and helps maintain accuracy across the extended industrial temperature range (-40°C to 125°C).
  • Extend system lifetime with 3-kVrms isolation in an 8-pin SOIC package - The high-quality construction of the TMCS1100 and TMCS1101 provides inherent galvanic isolation capable of delivering 3-kVrms of 60-second isolation per the Underwriters Laboratories (UL) 1577

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