Wide-band gap semiconductors such as silicon carbide (SiC) are becoming increasingly important because they offer significantly improved performance in a wide range of applications compared to traditional silicon technologies while reducing the energy required to achieve that performance and physical space. SiC technology is becoming critical in some applications where silicon has reached its physical limits as a power conversion platform, while in other applications, the advantages of efficiency, switching speed, size, weight and cooler, higher temperature, and higher voltage operation. This combination makes silicon carbide increasingly attractive. These material properties of silicon carbide result in higher:
Breakdown field strength
Electronic drift speed
Thermal conductivity
Energy storage system and improved efficiency
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Breakdown field strength
The higher breakdown field strength in silicon carbide allows the device to withstand higher voltages for a given area. It enables device designers to increase the area used for current flow at the same chip size, thereby reducing the device resistance Rsp for a given area. Device resistance is directly related to conducted power losses so that a smaller Rsp will result in lower losses, resulting in higher efficiency.
Electron drift speed
Compared to silicon-based semiconductors, electrons drift twice as fast in silicon-based semiconductors. It has two benefits. First, power losses are lower during the on-and-off transition times. Second, higher switching frequencies allow the use of smaller magnetics and capacitors.
Thermal conductivity
Silicon carbide has three times the thermal conductivity of silicon. It allows silicon carbide devices to operate at temperatures up to 200°C, compared to silicon's typical temperature limit of 150°C. These advantages allow system designers to design more efficient products while making them smaller, lighter and ultimately less expensive. When coupled with the cost savings from using smaller passive components and less thermal management, the overall system cost can be reduced by 20%. Silicon carbide's material properties make it highly advantageous in high-power applications that require high voltages, high currents, high temperatures, and high thermal conductivity while being lightweight overall.
Energy storage systems and improve efficiency
Due to various advantages, silicon carbide solutions have also been widely adopted in power delivery systems, especially in energy storage system (ESS) applications such as electric vehicle charging systems and solar systems with battery storage. DC/DC boost converters, bidirectional inverters (for AC/DC and DC/AC conversion), and battery charging circuits in these systems can all benefit from SiC technology, resulting in a 3% improvement in system efficiency and power density. Improve 50% and reduce the size and cost of passive components.
Advantages of silicon carbide (SiC) over gallium nitride (GaN)
While silicon carbide and gallium nitride offer superior performance compared to silicon, they come with a higher upfront cost. However, the long-term benefits could be significant. For high-power applications, increased efficiency and reduced cooling requirements can lead to better return on investment (ROI).
Comparison of Silicon Carbide (SiC) and Gallium Nitride (GaN)
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