15 February 2023
VisIC demos efficient GaN-based 3-phase traction inverter with automotive-grade PMSM motor
VisIC Technologies Ltd of Ness Ziona, Israel – a fabless supplier of power conversion devices based on gallium nitride (GaN) transistors for high-voltage automotive applications – says that it has successfully tested its 2.2mΩ 650V half-bridge power module, consisting of four parallel 8mΩ power FET, in a 3-phase configuration on a dyno-test-bench using a permanent magnet synchronous motor (PMSM) motor at a major automotive OEM.
VisIC reckons this has hence proven that its D3GaN (Direct Drive D-Mode Gallium-Nitride) technology is well-suited even for the most challenging high-power automotive applications. Concerns about parallelization and oscillations caused by fast-switching transients have been addressed.
Picture: VisIC’s 3-phase prototype inverter system.
The inverter phase current reached 350Arms (500A peak) at 400V, although test system set-up limitations prevented higher currents, which the 2.2mΩ power module is capable of.
Worldwide Harmonized Light Vehicles Test Procedure (WLTP) driving cycle testing was executed and achieved comparable efficiency with commercial silicon carbide-based modules, despite using early non-optimized module prototypes. This means that D3GaN will deliver its promise of the highest efficiency, improving car costs through lighter, smaller power systems and a smaller battery size, without compromising the car’s driving range. In addition, the D3GaN technology, based on a GaN-on-silicon process, is delivering better than silicon carbide (SiC) performance at the more competitive silicon cost level.
“With this great accomplishment, acknowledged by a leading automotive OEM, VisIC Technologies has provided overwhelming evidence for higher efficiency at lower-cost future electric vehicle (EV) traction inverters, for the automotive world,” reckons CEO & co-founder Dr Tamara Baksht. “The automotive market demands high-power, high-voltage, high-reliability GaN, and our D3GaN die and module solutions are the answer.”
VisIC’s 3-phase prototype inverter system will be available for testing across additional customer sites towards the end of second-quarter 2023.