AKM and SAL: Enabling downsizing and more efficient traction inverters for electric vehicles

Asahi Kasei Microdevices Corporation (AKM) and Silicon Austria Labs GmbH (SAL) have successfully completed a joint proof of concept for integrating a current sensor into a power module to be used in automotive applications such as traction inverters and DC-DC converters. This technology enables energy efficiency, as well as compact and lightweight design for ultra-high current applications using next-generation SiC power devices.

Market demand for downsized, lightweight solutions with high-resolution current sensing is on the rise for more efficient inverter systems in xEVs. To meet this need, AKM is developing the EZ232L, a linear Hall IC for coreless current sensors. With its high resolution and accuracy, this technology enhances the efficiency of traction inverters that require operation over a wide current range.

Traction inverters are the core component that powers the motors of electric drive systems in xEVs, serving as the bridge between the battery and electric drivetrain. Specifically, they play a critical role in converting direct current from the battery into alternating current. To ensure smooth and efficient control across varying driving conditions—low or high speed, cruising or accelerating—precise current sensing over a wide dynamic range is essential.

SAL and Asahi Kasei Microelectronics (AKM) collaborated to conduct a joint technical verification, using EZ232L to develop a power module that integrates a current sensor in order to address the limitations of conventional magnetic core-based current sensing.

“With this joint technology validation, we have set a new standard for current sensing in power modules, and we are proud to combine AKM's expertise with SAL's research capabilities to achieve this innovative result. We expect that the power module integrating coreless current sensor technology will contribute to smaller and lighter xEVs traction inverters," said Toshinori Takatsuka, General Manager of AKM's current sensor business.

“The designed power module offers an all-in-one solution, integrating the latest direct copper bonded power semiconductors along with gate driving circuits and current sensing capabilities. Using a standard PCB and off-the-shelf components, the module provides both flexibility and cost advantages for small-to-medium production volumes,” said Thomas Langbauer, Team Lead within the Power Electronics Division at SAL.

AKM and SAL have presented the results of their collaboration at PCIM Europe 2025 in Nuremberg, Germany. In addition, the two companies are exploring further collaboration, anticipating a positive impact on the market.