Current sensor for three-phase automotive traction inverter power modules

LEM has released the HAH3DR S07/SP42, a new compact current sensor designed for 800V three-phase power modules.

Developers of automotive traction inverters are increasingly utilising three-phase power modules such as the popular and widely proven Hybridpack Drive from Infineon. These modules now adopt the more efficient SiC MOSFET technology, permitting vehicles to use 800V battery systems that deliver faster charging and longer driving range.

The three-phase sensor has been designed to fit these 800V power modules. Fully calibrated over temperature and stable over the unit’s lifetime, they enable a quick time to market with little R&D effort. This makes them ideal for companies developing small passenger vehicle platforms, trucks and buses while restrained by limited R&D resources.

The new current sensor provides a wide selection of current measuring ranges from 700A to 1200A, and compared to existing units in the family, the package isolation characteristics have been upgraded to cope with the challenge of 800V power modules. As well as the new sensor, the company provides many packages and current measuring range options.

The module features a unique enlarged aperture that can accommodate up to 1.5mm thick busbars, making it compatible with the newest generation of power modules. It is also compatible with power modules from various suppliers, such as the Acepak Drive from ST Microelectronics and the SSDC from ON Semi, Starpower, and CRRC.

As an upgrade of an existing product family, the device is backwards compatible with the first generation HAH3DR S07/SP4 for 400V inverters, meaning no design changes are required to use the new device.

The device is a quality-managed product suitable for ISO 26262 safety-relevant applications within specific conditions, for which the company can provide safety, allowing customers to achieve up to an ASIL D at the inverter level.