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AI Algorithm Increase EV Inverter Efficiency

Pre-Switch Inc. has developed the AI-based DC/AC, AC/DC soft-switching controller, has published performance data that shows that its 200 kW (space vector modulated) CleanWave200 evaluation inverter exceeds 99.3 % efficiency at 100 kHz switching frequency using only three discrete, low cost 35 mΩ SiC MOSFETs per switch location. “We are shipping the CleanWave200 evaluation systems to initial customers, and the efficiency data we are making public on April 21 more than justifies our design goals. Customers could use the Pre-Switch technology with even better MOSFETs and expect to get incremental performance gains, but there is no other approach that even comes close to 99.3 % efficiency at 100 kHz with such few, low cost SIC MOSFETs,” comments Pre-Switch CEO Bruce Renouard. “Our AI enables users to migrate from lossy, expensive hard-switching implementations to high efficiency, soft-switching designs with a 10X higher switching frequency which produces an almost pure sine wave output. Our controller analyzes multiple inputs on a cycle-by-cycle basis, making adjustments in real time to small, forced-resonant transistors enabling perfect soft-switching in harsh changing environments. Variations in system temperature, device degradation, changing input voltages and abrupt current swings are all accounted for and optimized within the AI algorithm.”

The published data plots system efficiency for 50-100 kHz switching speeds, input voltages, power output and current output, enabling system designers to compare the Pre-Switch results to their own requirements. “Switching losses using our technology are effectively zero. If we put that into perspective, an EV improves inverter efficiencies, producing a pure sine wave output that improves motor efficiency at low torques where people drive. This will result in an increase its range by up to 12 %,” Renouard added.

The Cleanwave200 evaluation system, reference design and design files can be ordered from Pre-Switch Bruce.renouard@pre-switch.com


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