Asahi Kasei Microdevices’ New Current Sensor Enables Dramatically Smaller On-Board Chargers for Electric Vehicles
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Fast current measurements
The CZ39 series features a high-sensitivity compound Hall element that enables a response time of 100 ns, making it possible for current measurements to keep up with the high switching speed of SiC- and GaN-based power solutions. This allows OEMs to take advantage of those devices’ smaller size and thus reduce the weight of on-board charging systems in order to extend cruising range. The CZ39 series’ ability to quickly signal the system to interrupt current flow during an overcurrent condition also makes for a robust electronic fuse, or e-fuse, implementation.
Reduced heat generation
AKM has developed a unique package for the CZ39 series that achieves a primary conductor resistance of only 0.3 mΩ. Even under continuous 40 Arms current flow at an ambient temperature of 125ºC, heat generation is minimal, greatly reducing the need for bulky thermal management measures. Additionally, the structure of the package provides sufficient creepage and clearance distances for use in applications above 650 V.
Enhanced noise immunity
The combination of high voltage and high-speed switching in SiC- and GaN-based systems presents a challenge with respect to electrical noise mitigation. The CZ39 family is exceptionally resilient to such conditions, ensuring continuous and highly accurate current detection even in noisy environments.
Please visit AKM.com for additional information.
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Additional information is available on https://www.akm.com/global/en/.
About Asahi Kasei
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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christian.okeefe@ak-america.com
sebastian.schmidt@asahi-kasei.eu
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