New silicon carbide power module for electric vehicles

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Silicon carbide in electric vehicles stands for more efficiency, higher power density and performance. Particularly with an 800 V battery system and a large battery capacity, silicon carbide leads to a higher efficiency in inverters and thus enables longer ranges or lower battery costs. At its virtual PCIM booth (July 1-3), Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) will present the EasyPACK™ module with CoolSiC™ automotive MOSFET technology, a 1200 V half-bridge module with an 8 mΩ/150 A current rating.

In the past ten years, Infineon has sold more than 50 million EasyPACK modules with
different chipsets for a wide range of industrial and automotive applications. At the
same time, the semiconductor manufacturer has successfully established its
extensive portfolio of CoolSiC products in industrial applications. With the introduction
of the CoolSiC automotive MOSFET technology into the EasyPACK and full
automotive qualification, Infineon is now expanding the range of applications for the
module family to include high-voltage applications in electric cars with high efficiency
and switching frequency requirements. These include HV/HV-DC-DC step-up
converters, multi-phase inverters and fast-switching auxiliary drives such as
compressors for fuel cells.

CoolSiC Automotive MOSFET technology
The new module is based on Infineon’s silicon carbide trench MOSFET structure.
Compared to planar structures, the trench structure enables a higher cell density,
resulting in the best-in-class figure of merit. As a result, trench MOSFETs can be
operated at lower gate-oxide field strengths for higher reliability.
First-generation CoolSiC automotive MOSFET technology is optimized for use in
traction inverters, with a focus on achieving the lowest possible conduction losses,
especially under partial load conditions. Combined with the low switching losses of
silicon carbide MOSFETs, this enables losses in inverter operation to be reduced by
around 60 percent compared to silicon IGBTs.

In addition to optimizing performance, Infineon attaches great importance to
reliability. The chip manufacturer develops and tests CoolSiC automotive MOSFETs
with the aim of achieving high short-circuit, cosmic ray, and gate-oxide robustness,
which is key for designing efficient and reliable high-voltage applications in electric
cars.
The new CoolSiC automotive MOSFET power module is fully qualified to the
AQG324 standard.

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