[Editor's Note] Amidst the rapidly increasing global demand for eco-friendly energy transition and improved power efficiency, technological innovations in the power electronics field are already reorganizing the very foundation of our lives. Among them, SiC (silicon carbide) modules are attracting attention as key components that drastically reduce power loss and enable heat management and system miniaturization based on their superior high-temperature, high-voltage, and high-frequency operating characteristics compared to existing silicon-based devices. This technological excellence realizes stable and efficient power conversion in various applications such as solar power generation, electric vehicle inverters, and industrial motor drives, while also contributing greatly to environmental protection through energy savings. In the midst of this, Infineon recently updated its 'Power and Sensing Selection Guide 2025-2026' white paper and published detailed information on power devices. Based on this, we looked at the trends and requirements of 3-phase string inverters and related products.


According to the 'Power and Sensing Selection Guide 2025-2026' recently published by Infineon, Infineon is applying this SiC module technology to leading power device designs, introducing products to the market that guarantee stable operation even under extreme conditions.

For example, Infineon’s 2300 V PrimePACK™ 3+ module delivers outstanding power conversion performance in central solar inverter environments, and its high switching frequency combined with Maximum Power Point Tracking (MPPT) functionality enables maximum power extraction from solar panels.

Additionally, the CoolSiC™ MOSFET family provides excellent durability and fast response even in high-temperature environments through low conduction and switching losses, playing a role in maximizing energy efficiency in various power conversion applications.

The 3-phase string inverter solution is a technology that connects multiple solar modules (panels) into strings and converts the collected direct current power into high-quality alternating current power.

This solution is widely used in large-scale solar power plants and distributed energy networks, where a single inverter collects and converts direct current power from multiple panels, maximizing power efficiency and transmission stability.

It provides ease of maintenance along with modular design, reducing initial installation costs.Its importance is growing as it effectively reduces operating costs while increasing power conversion efficiency to ensure the stability of energy supply.

The 350kW class design, which is attracting particular attention from Infineon and its partners, represents an essential capacity for large-scale power plants such as central solar power plants.

The 350kW design is optimized to aggregate direct current power generated from hundreds of solar modules and reliably convert it into high-capacity alternating current power.

The reason why high-power design is important is because it maximizes energy production and distribution efficiency and minimizes power losses that occur in large-scale energy conversion systems, thereby reducing long-term maintenance costs and increasing system reliability to maintain stable power quality.

Additionally, the 350kW design is a standardized solution that takes into account interconnection and expandability between modules, providing a foundation for flexibly responding to future increases in energy demand.

The combination of this 350kW high-power design and SiC modules significantly improves energy conversion efficiency over conventional silicon-based inverters, while ensuring high durability and low heat loss even in extreme environments.

Especially in situations where solar power generation systems are exposed to changes in sunlight and high-temperature environments, the fast switching performance and stability of SiC-based power devices can eliminate unnecessary losses that occur during the power conversion process and maximize the efficiency of the entire system.

Furthermore, these technological innovations go beyond simply advancing power devices and play a critical role in increasing the economic feasibility and sustainability of the entire renewable energy system.

The 3-phase string inverter solution increases the modularity of components in power system design, significantly reducing the complexity of installation and management.
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