Tests performed on Pre-Switch’s CleanWave2 reference inverter at 100kHz switching speed show the system is 98.5% efficiency at 5% load. Peak efficiency is 99.57%. Read …
Pre-Switch, demonstrates ‘astonishing efficiency’ across full load range Find out more
March, 2023 San Jose, Ca., USA: Pre-Switch, Inc., the company that has developed the world’s first AI-based forced-resonant, soft-switching technology enabling ultra-efficient DC/AC, AC/DC inverters running …
SiC FET technology demonstrates the effectiveness of Pre-Switch solutions in high-frequency EV switching. Using United SiC cascode FETs, the Pre-Switch CleanWave200 was able to achieve …
EE World executive editor, Lee Teschler, speaks with Pre-Switch at the APEC 2022 show. Watch the video to learn how Pre-Switch technology eliminates switching losses …
May 2022 – Electronic Design Video – Pre-Switch uses machine learning to constantly adjust the relative timing of elements within the switching system required, forcing …
AI-Based Soft-Switching Inverter Tech Significantly Reduces Power Losses Find out more
Global e-mobility market experiencing the benefits of world-leading, AI-based soft-switching Pre-Switch technology. Sep 30, 2021 San Jose, Ca., USA: Pre-Switch, Inc., the company that has developed …
Over 99% efficient at 100kHz using 3 5mΩ MOSFETs. Brings significant benefits to EV and renewables. April 20 2021, Campbell, Ca., USA: Pre-Switch, Inc., a Silicon Valley …
Pre-Switch publishes highest efficiency figures for 200kW inverter Find out more
Screen captures illustrate active learning, analysis and adjustments that initiate and maintain optimized system timing. April 28 2020, Campbell, Ca., USA: Pre-Switch, Inc., a Silicon Valley …
April 2 2020, Campbell, Ca., USA: Pre-Switch, Inc., a Silicon Valley start-up that has developed the world’s-first Artificial Intelligence (AI) DC/AC, AC/DC soft-switching controller delivering …
Bruce Renouard – March 11 2020, Campbell, Ca., USA: Pre-Switch, Inc., a Silicon Valley start-up that has developed the world’s-first AI DC/AC, AC/DC soft-switching controller …
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A Pre-Switch-enabled inverter reduces sine wave output distortion by 10X, enabling motors to run more efficiently. In a conventional hard switching design, the output ripple current of the half-bridge circuit switching back and forth at 10-15 switching events per fundamental frequency causes a significant level of distortion. The distortion is effectively an induction heater in the motor coils and does no useful work. Pre-Switch technology minimizes this ripple by switching 10x faster. The lower distortion fundamental sine wave to the motor is what we call a ‘clean wave’ and improves motor efficiency predominantly at lower RPM and lower torques which is where EV’s are driven and increases EV range.
The second benefit of the Pre-Switch soft switching architecture is that inverter dV/dt is configurable with a free lossless dV/dt filter that is part of the architecture. Reducing dV/dt improves motor reliability and reduces motor winding insulation allowing higher power density motors. Due to the fast edge speeds of WBG (SiC; GaN) transistors, high dV/dt is traded off for reduced switching losses. But high dV/dt speeds of above 15-20V/ns can cause insulation damage. Inverter designers in the past accommodate these excessive dV/dt speeds by adding extra insulation in the motor. This approach has the adverse affect of reducing motor power density and increasing motor costs. In contrast, the Pre-Switch architecture slows edge speeds but allows increased switching frequencies, eliminating the problem of high dV/dt speeds and reducing the insulation required.
The faster switching speeds enabled with Pre-Switch can be used to spin motors faster. In some applications a lower cost, lighter and higher RPM motor can be used.
The final benefit for motor design is that because Pre-Switch-enabled systems switch so fast, low inductance motors can be used which have the benefit of being smaller and lighter and lower cost. This is particularly suitable for applications such as electric aircraft, where designers are trying to reduce the amount of iron in the motors to keep weight to a minimum.
