News: Microelectronics
17 June 2024
ROHM adds 2-in-1 silicon carbide molded modules to TRCDRIVE pack series
As part of its TRCDRIVE pack series, Japan-based ROHM has developed four models with 2-in-1 silicon carbide (SiC) molded modules (two 750V-rated: BSTxxxD08P4A1x4, two 1200V-rated: BSTxxxD12P4A1x1) optimized for xEV (electric vehicles) traction inverters. The TRCDRIVE pack supports up to 300kW and features high power density and a unique terminal configuration, helping to solve the key challenges of traction inverters in terms of miniaturization, higher efficiency, and fewer person-hours.
As the electrification of cars advances, progress is being made in the development of electric powertrain systems that are more efficient, compact, and lightweight. However, for SiC power devices that are attracting attention as key components, achieving low loss in a small size has been a difficult challenge. ROHM claims to have solved these issues inside powertrains with its TRCDRIVE pack.
A trademark brand for ROHM SiC molded type modules developed specifically for traction inverter drive applications, the TRCDRIVE pack reduces size by utilizing a unique structure that maximizes heat dissipation area. In addition, ROHM’s fourth-generation SiC MOSFETs with low O- resistance are built in, resulting in what is claimed to be an industry-leading power density 1.5 times higher than that of general SiC molded modules while greatly contributing to the miniaturization of inverters for xEVs.
The modules are also equipped with control signal terminals using press-fit pins enabling easy connection by simply pushing the gate driver board from the top, reducing installation time considerably. In addition, low inductance (5.7nH) is achieved by maximizing the current path and utilizing a two-layer bus-bar structure for the main wiring, contributing to lower losses during switching.
Despite developing modules, ROHM has established a mass-production system similar to discrete products, making it possible to increase production capacity by 30 times compared with conventional SiC case-type modules, it is reckoned.
Product lineup
TRCDRIVE pack is scheduled to be launched by March 2025 with a lineup of 12 models in different package sizes (small/large) and mounting patterns (TIM: heat dissipation sheet/Ag sinter). In addition, ROHM is developing a 6-in-1 product with a built-in heat sink that is expected to facilitate rapid traction inverter design and model rollout tailored to a variety of design specifications.
Application-level support
ROHM says that it is committed to providing application-level support, including the use of in-house motor testing equipment. Supporting materials are also offered, such as simulations and thermal designs that enable quick evaluation and adoption of TRCDRIVE pack products. Two evaluation kits are also available — one for double-pulse testing and the other for 3-phase full-bridge applications — enabling evaluation in similar conditions as practical inverter circuits.
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