Resonance Damping Optimization in 1200V Power Modules with Planar SiC MOSFET Devices for 200 kW Output

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Abstract:

Paralleling SiC MOSFETs in high-power modules introduces overvoltage and oscillation risks due to parasitic capacitances and inductances. This study presents a 200 kW EV inverter module co-designed at the device and packaging level to ensure switching reliability under harsh automotive conditions. At 800 V, the planar SiC MOSFET maintained stable gate voltage, while a benchmark trench device module experienced severe ringing and failure. Kelvin-source structures and internal gate resistors mitigated parasitic turn-on, and device-level optimizations—including a 0.5 µm foundry technology, silicide gate, and hexagonal cell layout—improved body-diode performance, together with the channel mobility, blocking voltage, and minimized on-resistance and switching losses. The resulting AEPR25B12C1STJN module demonstrated effective resonance damping, matched the performance of commercial trench module FS03MR12A6MA1B in static and dynamic tests, and achieved 98% AC efficiency with over 200 kW output at 150 °C junction temperature.

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DOI: 10.1109/itec.2018.8450223

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