Solving environmental and energy problems is an important global issue. While the demand for electric power continues to escalate, the call for energy conservation and the need for highly efficient and compact electric power conversion systems increases rapidly.
Power MOSFET using new SiC materials offer high voltage resistance, high-speed switching, and low on-resistance properties compared to conventional silicon (Si) MOSFET and IGBT products. This will greatly reduce power dissipation and supports a reduction in the size of equipment.
Features of SiC MOSFETs
Since the dielectric breakdown strength of SiC (silicon carbide) is about 10 times as high as that of Si (silicon), SiC power devices can offer a high withstand voltages and low voltage drops. The on-resistance per unit area can be reduced in SiC devices compared with that of Si for the same withstand voltage.
What are the merits of using SiC MOSFETs?
Introducing application examples that have improved efficiency by using SiC MOSFETs.
In the industrial sector, as commoditization and standardization progress, there are increasing cases in which a highly versatile reference design based on device selection and optimal solutions of circuits is used as an efficient development design approach.
This section provides reference designs using SiC MOSFETs for quick advancement of equipment designs.
3-Phase AC 400 V Input PFC Converter
Toshiba's reference design of a power factor correction (PFC) circuit for 3-phase 400 V AC inputs illustrates how to improve power supply efficiency using SiC MOSFETs. The design achieves a power conversion efficiency of 97% and a power factor of 0.99 or more. It is a reference design for the PFC section (gate drive circuit, sensor circuit, output power switch) of high-power converters such as electric vehicle (EV) charging stations.
The growing adoption of EVs has increased the demand for power conversion systems that must also be highly efficient and compact. This Toshiba reference design provides an excellent starting point for the PFC stage of power converters. It can be used as the basis for both prototyping and developing your application, helping it reach its full potential.
5 kW Isolated Bidirectional DC-DC Converter
The 5kW Isolated Bidirectional DC-DC Converter reference design from Toshiba shows how to improve a power supply design's efficiency using SiC MOSFETs. The design uses the dual active bridge (DAB) method, one of the most popular topologies for such high-power converters. The DAB topology has full bridges on both sides, allowing the direction and amount of power to be controlled by adjusting the phase difference between the left and right bridge circuits. This highly versatile reference design forms a starting point for developing and prototyping high-power conversion applications, such as electric vehicle charging stations and inverters in solar power generators.