Why IGBTs need anti-parallel diodes

IGBTs are power devices that are used in a wide range of applications, including electric vehicles, renewable energy, and industrial automation. They are known for their high power density, efficiency, and switching speed.

IGBTs are typically composed of four components: a collector, an emitter, a gate, and an anti-parallel diode. The anti-parallel diode is connected in parallel with the collector and emitter of the IGBT.

There are two main reasons why IGBTs need anti-parallel diodes.

First, the anti-parallel diode helps to protect the IGBT from overvoltage. When the IGBT is turned off, the collector-emitter voltage can rise to a very high level. The anti-parallel diode provides a path for current to flow, which helps to prevent the IGBT from being damaged.

Second, the anti-parallel diode helps to improve the switching performance of the IGBT. When the IGBT is turned off, the collector-emitter voltage must drop to zero quickly. The anti-parallel diode helps to absorb the current that flows from the IGBT during this process, which helps to reduce switching losses.

In conclusion, anti-parallel diodes are an essential part of IGBTs. They help to protect the IGBT from damage and improve its switching performance.