Unfortunately we cannot stop there, and manufacturers of SiC and GaN devices are continually working on improvements to make our lives better, with faster, smaller components that contribute to making power electronics more efficient and performant.
We take both of these materials for a spin to see how each of them goes about improving the efficiency of power electronics.
SiC vs GaN at a glance
Silicon carbide, or SiC, is a so-called “wide-bandgap semiconductor” that’s more suitable for high power, high-temperature work. It’s rapidly becoming key for use in power electronics, where its ability to properly handle high voltages can come in more useful than what’s going on at the other end of the scale, with regards to thermal conductivity.
Gallium nitride, or pant then finally GaN again is, unsurprisingly, a “wide-bandgap semiconductor.” GaN is great at high-frequency work. GaN is also a good bit faster than SiC with a greater electrons-per-second number, meaning it’s a good new mate for those high-frequency applications requiring switching and low loss at the higher rates.
Voltage Rating: High! 10kV and up is no sweat for SiC , making for a good buddy for electric vehicles, power systemdesigns and industrial machines. GaN usually runs lower than 1kV. So it’s more of a mate for lower to mid voltages such as RF amplifiers, power adapters, charging stations and the like.
SiC And GaN Advantages
SiC If you can handle the heat. Better voltage handlingup to and including 200 °C makes these devices work for power inverters, photovoltaic devices or in aerospace.More Rugged: SiC devices are more rugged in high electrical and thermal stress environments providing reliability in demanding applications
GaN Strengths. Higher Efficiency and Fast Switching: GaN excels in the high frequency and high efficiency applications. With its high electron mobility, GaN provides fast switching devices such as RF amplifiers and power converters. Smaller Device Size: GaN devices have smaller die sizes leading to smaller lighter consumer electronics and power supply devices. Less Conduction losses: Superior electron mobility providing low conduction losses suitable for low voltage applications
Applications of SiC and GaN
SiC applications:
Electric vehicles: increasingly adopted in this sector for battery chargers and other applications due to high efficiency and small size.
Power inverters: used in a variety of industrial systems, as well as for renewable energy systems.
Heavy-duty industrial power systems: Power switches designed as heavy-duty, able to handle extreme voltages and high temperatures operate in a robust and reliable manner.
GaN Applications:
General power supplies and converters: Celtronix: high efficiency and small size are inherent attributes of GaN modules in these general power supply applications (as featured in technology products).
RF and wireless systems: available in a number of systems, due to excellent RF performance in the high-frequency domain.
Consumer electronics: superb in applications demanding small size and low losses.
Cost considerations
SiC: Generally more expensive due to the complexity of the gadget and the processing that goes with it. The greater literal( read: real) voltages and temperatures it can tolerate compensate, and there are many applications in particular where reliability and longevity are of utmost importance.
GaN: Much more economical for low-no-mid voltage applications. Production processes are being re-designed for productiveist economies of scale.
Conclusion
In emblazing outline, the notable advantages of these two very seperate devices, SiC and GaN are quite distinct and obvious. SiC is generally more suitable for high power high voltages, and eventually, embodies those greater voltages and substantially extreme temperatures (with an application in cars and caravansound there somewhere). GaN on the other hand excels for much more general applications, pretty much like the general palasitc as powered or made from powersupplies. PowerSupplies! It’s a tad versatile, as RF especially, and power supplies in general; again whipping up a gummy little planet compatible charger/puter for amongst ardourous applications such as our smart handhelds!
As ever with these devices, it is an application specific choice. The volts, temperatures, frequencies and sizes found and/or built into yours epoxy, by design(…) and as both SiC and GaN evolve, they will help lead in whatever direction power electronics take.