Consequently, lightweight and compact power electronic components are key to enabling efficient designs and increasing the driving range of EVs.
In response, LEM and Semikron Danfoss have designed a new concept, called Nano, that merges the capabilities of LEM’s range of current sensors with Semikron Danfoss’s DCM half-bridge power module platform for high-power automotive applications. The collaboration results in a core-based sensor that is 60% smaller than anything previously available without, according to the companies, any compromise on performance.
“The Nano current sensor is a great example of how LEM is able to work hand-in-hand with industry specialists to tackle customers’ system challenges and create innovative current sensing solutions that deliver optimal performance levels,” said Damien Coutellier, Senior electronics engineer and Nano project manager at LEM.
The newly developed sensor makes it possible to completely integrate the sensing function into the power module, minimising component footprint and simplifying assembly, while keeping costs down.
It is intended for use with electric vehicle (EV) traction inverters with the DCM platform but is also compatible with other Semikron Danfoss power module platforms. The idea behind the Nano concept was to design a core-based current sensor that could fit into the unused space between the top side of the power module and the gate driver board.
This enables the footprint of the current sensor to overlap with the footprint of the power module. As a result, the Nano current sensor does not take up additional space in the inverter. Also, no additional components are required to fix the sensor mechanically and connect it electrically to the driver board – delivering a high level of integration.
The Nano current sensor is mounted on the DCMTM power module, which uses the latest generation of 750V and 1200V SiC MOSFETs and has a rated current of 200A to 1000A.
Characteristics of the DCM platform mean that the new device satisfies insulation coordination requirements for 800V batteries per IEC 60664-1. At the same time, enhanced mechanical robustness, high-temperature stability and protection from humidity and vibrations enable inverters to deliver stable and reliable performance in a range of environments.
“By working hand-in-hand with LEM, Semikron Danfoss was able to develop a unique solution that combined the best of both worlds – our expertise in power electronics with LEM’s current sensing and metrology knowledge. As a result, this plug-and-play solution will save our customers a great deal of time and effort because they will no longer have to worry about the current sensor footprint, assembly, validation, testing or even performance – they are all taken care of in a single package,” explained Thomas Zöls, Senior Electrical Engineers at Semikron Danfoss.
