SiC inverter evaluation system for increased EV efficiency

8th May 2019
Source: Pre-Switch
Posted By : Alex Lynn
SiC inverter evaluation system for increased EV efficiency

The Silicon Valley start-up that is delivering soft switching for DC/AC and AC/DC power conversion, Pre-Switch, has announced its CleanWave 200kW silicon carbide (SiC) automotive inverter evaluation system that enables power design engineers to investigate the accuracy of the company’s soft switching architecture and platform over varying load, temperature, device tolerance and degradation conditions.

Pre-Switch’s platform, including the Pre-Drive3 controller board, powered by the Pre-Flex FPGA, and RPG gate driver board, virtually eliminates switching losses, enabling fast switching at 100kHz, significantly improving low torque motor efficiency. High switching frequency also reduces motor copper and iron losses.

For electric vehicles this results in an increase in range of five to 12%. The soft-switching solution also benefits industrial motors, solar, wind and traction applications or any other power converter requirement greater than 100kW that is looking to reduce costs and improve efficiency.

Comments Bruce T. Renouard, CEO, Pre-Switch, said: “With Pre-Switch, critical design challenges hindering EV adoption, have been solved. Previously, the limited switching frequency of inverters resulted in a distortion of the output power sine wave causing excessive motor inefficiencies. 

“Our CleanWave inverter evaluation system, which is available to pre-order now, uses Artificial Intelligence (AI) to constantly-adjust the relative timing of elements within the switching system required to force a resonance to offset the current and voltage wave forms, thereby minimising switching losses and increasing EV range.”

Pre-Switch’s forced-resonant soft-switching topology replaces the traditional IGBT driver or silicon carbide driver with a common intelligent controller board, Pre-Drive3, and a specific plug-in RPG (Resonant Power Gate) module optimised for the customer’s chosen SiC or IGBT package. The Pre-Switch architecture increases efficiency and range, while reducing size and weight.


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