Pre-Switch, Inc. has announced new data proving the efficiency of the company’s architecture at low load as well as a full load. Tests performed on Pre-Switch’s CleanWave2 reference inverter at 100kHz switching speed show the system is 98.5% efficient at 5% load. Peak efficiency is 99.57%.

Pre-Switch eliminates switching losses, enabling 10X higher switching frequencies, resulting in huge efficiency gains. In EVs, this leads to improved motor efficiency, range, and reliability. The Pre-Switch architecture addresses the challenges that, until now, have prevented the industry from making the transition to soft-switching for EV inverters.  The exceptional efficiency at low loads and high-frequency low distortion sign wave to the motor significantly improves WLTP (EPA’s European milage test system) range performance.  The topology is a variation of the Auxiliary Resonant Commutated Pole (ARCP) soft-switching converter design. However, Pre-Switch employs sophisticated, embedded artificial intelligence to solve complex switching system timing calculations dynamically to ensure accurate soft-switching under changing input voltage, output load, device tolerances, and temperature changes. Adaptations are made on a cycle-by-cycle basis to minimize losses and maximize efficiency.

Pre-Switch is already working with leading EV makers and other emobility companies; evaluation systems are available for other interested parties.