Which inverter is better, MOSFET or IGBT?

The choice between MOSFETs and IGBTs for high power switching in AC circuits depends on several factors, including the specific application, voltage and current levels, switching frequency, and cost considerations.

MOSFETs and IGBTs have different characteristics that make them suitable for different applications. Here are some factors to consider when choosing between MOSFETs and IGBTs for high power switching in AC circuits:

1. Voltage rating: IGBTs are generally better suited for high-voltage applications, typically above 600V. MOSFETs, on the other hand, are more commonly used in low to medium voltage applications, typically up to 600V.

2. Switching speed: MOSFETs have a much faster switching speed than IGBTs, making them better suited for high-frequency switching applications. However, IGBTs have a lower on-state voltage drop, which means they dissipate less power during switching.

3. Conduction losses: IGBTs typically have lower conduction losses than MOSFETs, which means they are more efficient for high-current applications.

4. Cost: IGBTs are generally more expensive than MOSFETs, but the cost difference can vary depending on the specific application.

Based on these factors, MOSFETs are often a good choice for low to medium voltage and high-frequency applications, such as in switch-mode power supplies and motor drives. IGBTs are often a good choice for high-voltage and high-current applications, such as in large motor drives and power transmission systems.

Ultimately, the choice between MOSFETs and IGBTs will depend on the specific requirements of the application, and a careful analysis of the tradeoffs between cost, performance, and other factors should be conducted before making a decision.