IN Brief:
- Eaton will use Infineon SiC power semiconductors in its MVSST 2.0 medium voltage solid state transformer platform.
- The architecture targets emerging 800VDC AI data centres while reducing the number of conversion stages between grid supply and IT loads.
- Eaton and Infineon are examining future platforms based on 2.3kV and 3.3kV SiC power modules.
Infineon Technologies will supply silicon carbide power semiconductors for Eaton’s MVSST 2.0 medium voltage solid state transformer platform, taking SiC further upstream in the electrical architecture being developed for high density AI data centres.
The platform is intended for deployment in Asia Pacific and is designed around emerging 800VDC distribution architectures. Eaton is using active power electronics to reduce the number of conversion stages between the medium voltage grid connection and the DC supply required by increasingly power dense computing infrastructure.
That conversion chain is becoming a more visible constraint as rack power rises. Conventional data centre electrical systems move through several transformer and power conversion stages before electricity reaches the IT load, with each stage contributing losses, heat, equipment volume and protection requirements.
Moving more of the conversion towards a medium voltage solid state transformer changes that relationship. Eaton’s MVSST 2.0 uses controlled semiconductor switching rather than relying solely on a passive transformer, allowing the equipment to combine voltage transformation with active conversion and control.
Infineon’s SiC devices sit at the centre of that switching stage. Silicon carbide can operate at higher switching frequencies and lower losses than conventional silicon devices in suitable high voltage applications, creating scope to reduce the size of surrounding magnetic and filtering components while improving conversion efficiency.
The benefit is not determined by the semiconductor alone. Gate drive, insulation, cooling, magnetics, fault management and converter topology all influence whether the theoretical device advantages survive at system level, particularly when the equipment is connected directly into infrastructure expected to operate continuously at megawatt scale.
Eaton says MVSST 2.0 reduces the number of conversion stages compared with conventional architectures while improving power density and deployment flexibility. It is also among the early medium voltage solid state transformer platforms developed around IEC certification requirements, placing electrical safety and grid integration alongside conversion efficiency.
That distinguishes this programme from component demonstrations around 800VDC data centre power. Infineon has already been working across protection, conversion and rack power technologies associated with higher voltage DC distribution, but the Eaton agreement places its SiC devices inside a defined medium voltage transformer platform intended for deployment.
The move towards 800VDC is driven partly by current. Supplying a given amount of power at a higher voltage reduces current, which can cut resistive losses and reduce conductor requirements. The change also introduces more demanding insulation, isolation and protection conditions, particularly around fault interruption and maintenance.
A solid state transformer can contribute more active control than a conventional magnetic transformer, but that capability creates additional electronic complexity. Semiconductor switches and their control systems have to respond predictably to grid disturbances and load faults while maintaining the conversion performance that justified the architecture in the first place.
Future device voltage is already part of the development programme. Eaton and Infineon are examining later SST platforms using 2.3kV and 3.3kV SiC power modules, which could allow higher system voltages and different converter topologies without relying on as many series connected semiconductor devices.
Higher blocking voltage does not automatically simplify the whole system. Packaging, isolation distances, switching transients and thermal behaviour become increasingly demanding as device voltage rises, while designers still have to balance switching speed against electromagnetic interference and insulation stress.
The companies identify grid modernisation and renewable energy systems alongside AI data centres as possible future applications. The underlying requirement is similar: bidirectional or actively controlled conversion between medium voltage infrastructure and DC or lower voltage systems, with efficiency and control functions that are difficult to achieve through passive equipment alone.
For MVSST 2.0, the immediate engineering step is more concrete. Infineon’s SiC technology is moving into Eaton’s named transformer platform, giving the devices a system role at the interface between medium voltage distribution and an emerging 800VDC data centre architecture.
Deployment will provide the more useful evidence. Efficiency, thermal performance, fault behaviour and service reliability under sustained load will determine whether the additional semiconductor content can displace enough conventional conversion hardware to justify a wider shift towards solid state transformers.
