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800V current sensor for three phase traction inverter designs

800V current sensor for three phase traction inverter designs

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By Nick Flaherty



LEM in Switzerland has developed a compact Hall current sensor designed to fit into  800V three-phase power modules in electric vehicles (EVs).

The HAH3DR S07/SP42 three-phase Hall sensor has been designed to fit 800V power modules used in inverter designs.

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

The sensor is fully calibrated over temperature and stable over the unit’s lifetime and aimed at small passenger vehicle platforms, trucks and buses that are restrained by limited R&D resources.

The current sensor offers a wide selection of current measuring ranges from 700A to 1200A, and compared to existing units in the HAH3DR family, the package isolation characteristics have been upgraded to cope with the challenge of 800V power modules. Alongside the sensor LEM is offering a large choice of packages and current measuring range options.

The HAH3DR S07/SP42 has a unique enlarged aperture that can accommodate busbars up to 1.5mm thick, making it compatible with newest generation of power modules.

It is also compatible with power modules from various other suppliers, such as the Acepak Drive from ST Microelectronics, the SSDC from ON Semi, and others such as Starpower and CRRC.

As an upgrade of an existing well proven product family, the HAH3DR S07/SP42 is backwards compatible with the first generation HAH3DR S07/SP4 for 400V inverters, meaning no design changes are needed to use the new device.

The Hall sensor is suitable for ISO 26262 safety-relevant applications within specific conditions, for which LEM can provide a safety enabling customers to achieve up to an ASIL D at the inverter level.

The LEM HAH3DR S07/SP42 is a 3 phase Hall sensor for drive applications (DR) and the S07 designates the sub-family developed specifically for power modules such as the Hybridpack Drive. SP42 designates the specific product in the S07 sub-family which is compatible with 800V power modules with long busbars

www.lem.com 

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