Breakthrough in High-Voltage Conversion Technology: WeEn Semiconductors Unveils WMSC Series Silicon Carbide Modules
WeEn Semiconductors announced the launch of its WMSC series of silicon carbide (SiC) power modules on July 21, featuring over 20 AC-DC and DC-DC products designed for solid-state transformers (SSTs), electric vehicle (EV) chargers, smart grids, and renewable energy systems. The new series offers voltage ratings ranging from 1,200V to 2,300V, with a minimum on-resistance (RDS(on)) of just 1.5mΩ, marking a significant advancement in high-voltage power conversion technology.
WeEn Semiconductors stated that the WMSC series modules deliver high-efficiency conversion, capable of single-stage conversion from 35kV AC to 800V DC for grid-side power factor correction (PFC) in AI racks. Among the modules, three-level topology parts such as the 1,700V, 5.0mΩ WMSC5R0N17B3T improve electromagnetic interference (EMI) performance, while two-level devices like the 2,300V WMSC5R0F23B3T offer easier control and smaller footprints.
For DC-DC conversion applications, the WMSC series includes multiple half-bridge modules suitable for primary and secondary circuits in LLC and dual-active bridge (DAB) converters. The product lineup features various packaging options, including B2, B3, and 62mm screw-mounted designs. The B3 package modules range from the 2,300V WMSC5R0HS23B3T (for AC-side applications) to the 1,200V WMSC2R4F12B3T (for secondary-side applications). The 62mm screw-mounted package includes the 1,700V, 2.7mΩ WMSC2R7H17T2N-D (for LLC and DAB primary circuits) and the 1,700V, 7.5mΩ WMSC7R5H17T2N-D (for secondary circuits). The lowest on-resistance in the series is the 1,200V, 1.5mΩ WMSC1R5H12B3S, which employs a PCB-soldered half-bridge design for secondary circuit applications.
Low-Inductance Design and Highly Customizable Options Meet Diverse Application Needs
WeEn Semiconductors emphasized that the WMSC series modules feature low-inductance design, with pin arrangements that accommodate gate drive circuit space, device integration, and electrical safety. The modules offer a range of options, including direct bonded copper (DBC), case and silicone-gel materials, as well as various mounting methods, pin types, plating, and pre-applied thermal interface materials, allowing for customization based on customer requirements. WeEn Semiconductors noted that solid-state transformers utilizing WMSC modules can achieve conversion efficiencies of approximately 98%, with all modules available for sampling and in production quantities.
Kevin Shen, President of WeEn Semiconductors, stated that the WMSC series modules cover roughly 90% of all solid-state transformer applications and are also suitable for smart grids, renewable energy, and other high-voltage systems. He highlighted that silicon carbide modules provide higher switching speeds and breakdown voltages, enabling direct connection to medium-voltage grids while reducing the need for magnetic components, improving overall efficiency, and simplifying cooling designs. This technological breakthrough not only enhances power density but also delivers more reliable solutions for high-voltage applications, expected to accelerate the adoption of solid-state transformers and electric vehicle charging infrastructure.
