Classroom | Switching Losses and the Optimization Power of GaN & SiC
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December 16, 2025
Classroom | Switching Losses and the Optimization Power of GaN & SiC
In the world of power devices, switching loss is an unavoidable and critical topic.
For modern electronic systems striving for high efficiency, understanding and optimizing switching losses is essential.
Part 01 | What Are “Switching Losses” in Power Devices?
Power devices are responsible for controlling the on/off flow of current within a circuit.
To make it simple, switching loss refers to the power dissipated during the turn-on and turn-off transitions of a device. It consists of turn-on loss and turn-off loss.
How Switching Loss Occurs
During turn-on, voltage does not drop to zero instantly, and current does not immediately rise to the load current. The overlap between voltage and current creates turn-on loss.
Similarly:
During turn-off, current does not immediately fall to zero while voltage begins to rise. This overlap results in turn-off loss.
Additional Sources of Switching Loss
In switching power supplies, additional losses arise from charging and discharging of parasitic capacitances in large MOSFETs.
Relationship with Switching Frequency
Switching loss is proportional to switching frequency. Higher frequency means more switching events per unit time and therefore, higher total loss.
In hard-switching circuits, each switching event produces a fixed loss due to voltage-current overlap.
Total switching loss = Energy loss per switching event × switching frequency
As frequency increases, total loss rises proportionally.
In most cases, turn-off loss is significantly higher than turn-on loss.
Part 02 | How GaN and SiC Optimize Switching Loss
GaN (Gallium Nitride)
As a wide-bandgap semiconductor material, GaN offers exceptional performance. Its high electron mobility means faster switching transitions for GaN devices.
Its shorter switching time contributes to reduced voltage-current overlap and lower switching loss.
Additionally, GaN devices do not have a body diode, eliminating reverse recovery losses associated with traditional devices.
Practical Benefits of GaN
In high-frequency switching power supplies, switching frequency can reach hundreds of kHz or higher. Switching loss remains low and therefore, overall power conversion efficiency is significantly improved.
SiC (Silicon Carbide)
SiC is equally powerful in reducing switching losses. Its high breakdown electric field can support higher voltage operation. Its lower on-resistance results in reduced conduction loss.
In addition, SiC MOSFETs feature extremely fast body diode reverse recovery. This significantly reduces turn-off losses.
SiC MOSFETs are widely used in high-voltage, high-power applications such as EV charging stations and industrial inverters. They can improve system efficiency, reduce energy losses and enhance reliability.
Part 03 | THINKANTECH: Maximizing the Advantages of GaN & SiC
THINKANTECH is deeply focused on power semiconductor innovation, fully leveraging the advantages of GaN and SiC in its product portfolio.
Through careful design and rigorous testing, THINKANTECH devices deliver outstanding performance in minimizing switching losses.
Application Examples
GaN chargers can achieve high power output, fast charging in compact size with reduced heat generation.
SiC power modules enable higher system efficiency with lower operating costs.
Key Value Proposition
By utilizing high-performance materials designed for high frequency, high voltage high temperature applications, THINKANTECH GaN and SiC devices can reduce system losses, improve power conversion efficiency, and deliver high-performance, energy-efficient solutions.
Conclusion
Choosing THINKANTECH GaN/SiC power devices means choosing higher efficiency, lower losses, and stronger system performance.
Empower your electronic systems with advanced semiconductor technology and unlock a new era of energy-efficient innovation.
About THINKANTECH Technology
THINKANTECH specializes in the R&D and commercialization of power semiconductor devices and modules, including:
Si MOSFETs & IGBTs GaN HEMTs SiC MOSFETs & SBDs IGBT and SiC modules
Its products are widely used in consumer electronics, photovoltaics & energy storage, automotive systems, AI servers, and industrial automation.
Headquartered in Nanjing, THINKANTECH operates branches across Shenzhen, Suzhou, Jiangsu, and continues expanding into North America and Taiwan.
Contact
Nanjing HQ: +86-25-51180705
Shenzhen Office: +86-755-36991759
Email: xinkansen@x-ipm.com
Website: https://x-ipm.com
