Central inverter solutions

Central inverters convert power on multiple strings of connected solar panels. They are rated from around 600 kW to 4000 kW. Central inverters typically rely on single-stage power conversion, and most inverter designs are transformer-based or isolated. In the DC-AC stage, variable DC is converted to grid-compatible AC power.

Two-level or three-level NPC1 / NPC2 / ANPC topologies are preferred in this stage. A three-level topology is widely used as it enables higher efficiency levels. A three-level NPC2 topology is usually the preferred choice for 1000 V photovoltaic (PV) systems. 1500 V PV systems are becoming more popular as they can reduce system costs and improve end-to-end efficiency. Three-level NPC1 / ANPC topologies enable more robust inverter designs more resistant to cosmic radiation. Switching frequency and cooling requirements are key factors that influence the size of the AC filter, the volume of the system, and costs. Power modules that offer low losses and high current densities are desirable.

Designers often build inverters ranging from 600 kW to 2000 kW and then connect these in parallel to create inverter solutions of up to 4000 kW. For inverter designs ranging from 600 kW to 2000 kW, our power modules enable designers to achieve best-in-class power densities and streamline manufacturing. Our products here include our  EconoDUAL™ 3  family, 62 mm modules, and  PrimePACK™ 3/3+ modules. And because all switches need a driver and all drivers need to be controlled, we also offer the right  EiceDRIVER™ isolated gate driver along with  XMC™ and PSoC™ microcontrollers to complete your inverter designs. Finally, each functional block needs a sensor and auxiliary power supply, so we offer CoolSET™ together with and the TLI4971 current sensor. A smart combination to address connectivity is offered by the which provide a Bluetooth^® and Wi-Fi module in a single device.

Manufacturers are continually looking to improve system costs and performance levels. As a result, inverter power capacities are gradually rising. This has led to a clear trend towards 1500 V photovoltaic arrays in utility-scale installations.

Thanks to our broad portfolio of power semiconductors and our expertise in leading technologies such as silicon (Si), silicon carbide (SiC) and gallium nitride (GaN), we can customize chip technology and packaging, offering you the perfect solution for your PV inverters.

The latest generation silicon carbide semiconductors and CoolSiC™ MOSFETs enable a significant increase in power conversion efficiency in solar power generation systems and associated energy storage. Read more about these applications and how lower loss not only saves energy, but also results in smaller and lighter equipment with lower capital, installation, and maintenance costs.

Download now

This presentation gives you an overview of topologies, technological trends, and requirements of solar applications. Find out more about our offering for each inverter type – from the microinverter to the central and string inverter. Check our recommendations for your application, and you get your customized module in a five-month timeframe.

Download now

In the webinar, you will gain insight into renewables and the emerging applications of energy storage. Learn more about application trends and requirements, and understand Infineon's solution offerings for these applications.

Watch now