Wolfspeed has expanded the use of silicon carbide technology for outdoor systems in transportation and renewable energy applications with the introduction of a new high-reliability 1.2kV SiC power module. Announced at PCIM 2017, this industry-first module successfully passes stringent environmental qualification tests for simultaneous high humidity, high temperature, and high voltage operation.
This new reliability benchmark enables system designers to confidently deploy SiC power modules in outdoor applications such as transportation, wind energy, solar power, and other renewable energy systems. These environments have traditionally posed challenges for safe and stable device operation due to extreme conditions. Passing these tests demonstrates the robustness and maturity of silicon carbide technology for demanding real-world applications.
The all-SiC power module is rated at 300A with a blocking voltage of 1.2kV. It was tested under severe environmental conditions, including 85 percent relative humidity and an ambient temperature of 85 degrees Celsius, while biased at 80 percent of its rated voltage, equivalent to 960V. Successful operation under these conditions provides strong confidence in the long-term reliability and durability of SiC power devices.
Performance under biased stress testing further validates the overall robustness of silicon carbide technology across a wide range of applications. This achievement highlights the suitability of SiC power modules for next-generation power conversion systems that must operate efficiently and reliably in harsh environments.
According to Alstom, silicon carbide components enable the design of compact, lightweight, and low-loss power converters required for railway transportation applications. Achieving the benchmark for high temperature and high humidity operation under high bias voltage represents a critical milestone in the adoption of SiC devices for demanding transportation markets.
The module is powered by new Wolfspeed silicon carbide MOSFETs, part number CPM2-1200-0025A, along with Gen5 Schottky diodes. Both components have passed the same harsh environmental qualification tests at the die level. The module delivers a low on-resistance of just 4.2 milliohms and achieves more than five times lower switching losses compared to similarly rated, latest-generation IGBT modules.
Advanced module construction techniques are employed, including high thermal conductivity aluminum nitride substrates and optimized assembly methods. These design features ensure compliance with industry requirements for thermal cycling and power cycling while supporting high efficiency and high power density operation.
Wolfspeed stated that this 1200V SiC module reflects its commitment to enabling future power electronics markets by meeting anticipated system requirements for 2020 and beyond. The module is available under part number WAS300M12BM2 and can be driven using existing Wolfspeed gate drivers designed for 62mm power modules.