Latest CoolSiC MOSFETs ensure maintenance-free servo drives

Maintenance-free motor drive inverters are the ultimate prize in robotics and automation industry  and Infineon Technologies believes it is supported the industry’s endeavours with the latest CoolSiC member.

The CoolSiC MOSFET with .XT interconnection technology is supplied in a 1200V optimised D 2PAK-7 SMD package, making passive cooling possible. According to Infineon, they exhibit up to 80 per cent loss reduction compared to a silicon-based version and therefore eliminates the need for cooling fans and related services.

The MOSFETs enable high efficiency in various power ratings for servo drives as well as in compact charging infrastructure and industrial power supplies, Infineon advises.

Automation without cooling fans offer the potential for savings on maintenance effort and material, said Peter Wawer, division president of Industrial Power and Control at Infineon. “By combining CoolSiC trench MOSFET chip with .XT interconnection technology we enhance the thermal and cycling capabilities in a small package form factor. This also allows a compact integration of the drive within the motor or into a robot arm,” he explained.

Ohmic conduction losses and fully controllable switching transients of SiC MOSFETs match the load profile of servo motors. An 80 per cent system loss reduction is possible, even for the same EMC level as for IGBT solutions, at dv/dt:s of 5.0 to 8.0V/nano seconds. The CoolSiC MOSFET surface mount devices have a short circuit withstand time of 3 micro seconds. This meets servo motor requirements where relatively small inductors and short cables are in use, confirms Infineon.

The CoolSiC MOSFET with .XT portfolio is rated from 30 to 350 mOhm. The .XT technology allows up to 30 per cent extra loss to be dissipated through the chip package interconnection, compared to standard packages. The CoolSiC .XT portfolio shows best-in-class thermal performance and cycling capabilities, claims Infineon, resulting in up to 14 per cent higher output current, or doubled switching frequency, or 10 to 15K lower operating temperatures compared to standard technology.

The 1200V CoolSiC MOSFETs in D 2PAK-7 package can be ordered now. Infineon has already announced plans to extend the portfolio with 650V devices which will be available as engineering samples in 2021.

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