New MOSFETs Enabling Maintenance-Free Servo Drives

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Upto 80 percent loss reduction is achieved, which eliminates cooling fans for a best-in-class thermal performance

Supporting the robotics and automation industry in implementing maintenance-free motor drive inverters is the new CoolSiC MOSFET with .XT interconnection technology. It enables up to 80 per cent loss reduction and eliminates the need for cooling fans and related services. The devices enable high efficiency in various power ratings for servo drive solutions, additional applications profiting from the SMD devices including compact charging infrastructure and industrial power supplies.

A servo drive is the “activator” of the motor in manufacturing equipment. Ohmic conduction losses and fully controllable switching transients of SiC MOSFETs are a perfect match with the load profile of such 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 to 8 V/ns. The new CoolSiC MOSFET SMD devices come with a short-circuit withstand time of 3 µs. This meets servo motor requirements where relatively small inductors and short cables are in use.

Improved Capabilities

The new portfolio is rated from 30 mΩ up to 350 mΩ. The CoolSiC .XT portfolio also shows best-in-class thermal performance and cycling capabilities, resulting in up to 14 per cent higher output current, or doubled switching frequency, or 10 to 15 K lower operating temperatures compared to standard technology.

“Automation solutions without cooling fans open up a new reality when it comes to savings on maintenance effort and material,” said Peter Wawer, Division President 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.”

The 1200 V CoolSiC MOSFETs in D 2PAK-7 package can be ordered now. Infineon plans to extend the SMD package portfolio also in 650 V, with more than 18 new products (R DS(on) 25 to 200 mΩ) to be available as engineering samples in 2021.


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