Pre-switch expands with test facility

October 01, 2021 // By Nick Flaherty
Pre-switch expands with test facility
A new building will host a 200kW dyno as Pre-Switch ramps up its AI-based 100kHz e-mobility inverter reference platform

AI-based forced resonant soft-switching technology developer Pre-Switch has expanded into a new facility in the US to support the next phase of the company’s growth.

The new facility, in San Jose, California, has been outfitted with a 200kW dynamometer, a 250kW DC power supply and high precision efficiency test stations that have been custom-built to precisely measure inverter efficiencies above 99 percent.

This will enable customers to measure the motor efficiencies that result from the higher quality sine wave generated by the faster switching frequencies in the CleanWave inverter reference design. This will accelerate the application of the 100kHz technology which extends the range of e-mobility applications including EVs, electric aircraft and electric boats and other watercraft.

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“Inverter efficiency is vital, but in many applications, motor efficiency, especially at low torque where the motor mainly operates, is even more important. Only our soft-switching technology can deliver both, unlike hard-switching techniques which cannot get close to matching our system efficiency levels,” said Bruce Renouard, CEO of Pre-Switch (above).

Pre-Switch began shipping its 200kW (space vector modulated) CleanWave evaluation inverter a year ago, showing efficiencies exceeding 99.3% at 100kHz using only three discrete, low cost 35 mΩ SiC MOSFETs per switch location.

The Pre-Switch controller analyzes multiple inputs on a cycle-by-cycle basis, making adjustments in real time to small, forced-resonant transistors enabling perfect soft-switching. The Pre-Switch AI algorithm handles variations in system temperature, device degradation, changing input voltages and abrupt current swings.

To support this development activity, Pre-Switch has brought in more staff, strengthening the design team, in-house manufacturing, licensing and sales support, all located at the new San Jose headquarters.

www.pre-switch.com

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