AKM Achieves Successful Proof of Concept for eFuse in High Voltage 800 V Automotive Applications

Door opener for compact, fast and reliable protection of e.g., on-board chargers or DC/DC converters for electric vehicles

Asahi Kasei Microdevices Corporation (AKM) and Silicon Austria Labs GmbH (SAL), the European research center for electronics and software based systems research, have successfully completed a joint proof of concept of the eFuse technology in high-voltage applications utilizing silicon carbide (SiC)-based power devices. The results show that the eFuse technology can significantly improve safety, as well as reducing material and maintenance costs of systems such as on-board chargers (OBC) in automobiles.

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eFuse system jointly developed by AKM and SAL (Photo: Business Wire)

The popularity of SiC- and gallium nitride (GaN)-based power devices in electric vehicles and other high-voltage applications is on the rise. This makes it necessary to replace mechanical fuses – which have been utilized with conventional silicon (Si) based power converters – in order to immediately shut down the system when detecting an overcurrent, protecting the devices and avoiding costly maintenance.

AKM is producing the CZ39 series, a coreless current sensor with a response time of 100 ns. Its fast response capability and high accuracy allow for precise detection of overcurrent and quick system shutdown. In a joint technical verification together with the Austrian research center SAL, AKM has developed the eFuse system which solves the challenges of conventional protection systems using mechanical fuses. This solution provides the overcurrent and short circuit protection required for next-generation high-voltage EV systems with SiC- and GaN-based power devices, such as OBCs. Furthermore, the current sensor integrated into the eFuse can efficiently regulate the current in connected subsystems, thereby reducing the overall part count.

“With this joint technology validation, we have set a new standard for eFuse technology, and we are proud to combine AKM's expertise with SAL's research capabilities to achieve this innovative result. We expect that the eFuse technology will contribute to smaller and lighter EV onboard chargers," said Toshinori Takatsuka, General Manager of AKM's current sensor business.

“By utilizing the latest AKM current sensing technologies, we can improve the reaction time of eFuses and the protection of wide-bandgap power converters,” said Thomas Langbauer, Team Lead within the Power Electronics Division at SAL.

AKM will present the results of the joint research with SAL at PCIM Europe 2024 (Nuremberg, Germany) in June. In addition, the two companies are discussing further steps as they anticipate a positive market impact.

About Silicon Austria Labs (SAL)

Silicon Austria Labs GmbH (SAL) was founded in 2018 as a top non-university research center for electronics and software based systems. At its locations in Graz, Villach and Linz, research is conducted on key technologies in the fields of Microsystems, Sensor Systems, Power Electronics, Intelligent Wireless Systems and Embedded Systems. SAL brings together key players from industry and science and thus valuable expertise and know-how, and conducts cooperative, application-oriented research along the value chain.

More information about SAL is available at https://silicon-austria-labs.com/

About Asahi Kasei Microdevices

The Asahi Kasei Group contributes to life and living for people around the world. Since its foundation in 1922 with ammonia and cellulose fiber business, Asahi Kasei has consistently grown through the proactive transformation of its business portfolio to meet the evolving needs of every age. With more than 48,000 employees worldwide, the company contributes to sustainable society by providing solutions to the world’s challenges through its three business sectors of Material, Homes, and Health Care. For more information, visit www.asahi-kasei.com.

Asahi Kasei is also dedicated to sustainability initiatives and is contributing to reaching a carbon neutral society by 2050. To learn more, visit https://www.asahi-kasei.com/sustainability/.

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