Texas Instruments (TI) has launched the TMCS2100-Q1 multi-axis coreless Hall effect current sensor, aiming to improve the current detection performance 

of traction inverters in hybrid and pure electric vehicles. This device combines dual-axis magnetic field measurement with its own algorithm, eliminating the

 burden of traditional magnetic core solutions in terms of size and weight, while achieving higher measurement accuracy.

For industry readers of eeNews Europe specializing in electric vehicle power electronics, motor control, and automotive sensing development, this new 

technology provides a fresh perspective for solving the trade-off between the size of the inverter and the accuracy of current measurement. As automakers 

evolve towards higher power density traction systems and 800V electrical architectures, the application value of this device will become increasingly 

prominent.

Dual-axis measurement achieves higher detection accuracy

Traditional coreless Hall current sensors typically only measure the magnetic field of a single axis. However, the TMCS2100-Q1 can simultaneously collect 

magnetic fields in both horizontal and vertical directions, compensating for the impact of sensor position offset relative to the conductor.

TI claims that this solution can achieve 20 times the accuracy of competing single-axis products; with a 0.4mm displacement, the displacement error is less 

than 1%; and at a displacement of 0.1mm, the displacement error is as low as 0.25%.

In the traction inverter, vehicle vibrations cause relative displacement between the sensor and the conductor, introducing measurement errors. Therefore, 

these performance characteristics are crucial. More accurate current detection can optimize the torque control loop of the powertrain, reduce torque 

pulsation, and enhance system efficiency and power output.

"Engineers finally have a Hall current sensor that can break through the limitations of existing solutions. The 800V architecture now demands higher 

precision for the traction inverter, which is of great significance," said Jason Cole, Vice President and General Manager of TI's Sensor Products. "Based on 

the cutting-edge research results of TI's Kilby Laboratory (the company's leading-edge R&D institution), the TMCS2100-Q1 was born, providing automakers

 with a powerful tool for developing hybrid and pure electric vehicles. More accurate current detection directly translates to longer battery life, smoother 

driving experience, and more efficient motor control."

Supporting miniaturization design of traction inverters

Traditional current detection solutions rely on magnetic cores to ensure accuracy, but magnetic cores increase the size and weight of the device. The 

coreless solution avoids this problem but is more susceptible to displacement errors and magnetic field interference.

TI states that this multi-axis architecture can achieve measurement accuracy without sacrificing it. The TMCS2100-Q1 does not require slotting, cutting, or 

drilling on the busbar, simplifying thermal design and mechanical structure design work.

This sensor can adopt a multi-sensor combination architecture, arranged around the busbar at relative positions, facilitating engineers to optimize PCB 

layout space and reduce the overall size of the traction inverter.