V I Characteristics of IGBT | Summary and Q&A

TL;DR

The video discusses the characteristics of a power IGBT, including the threshold voltage, on-state behavior, and the relationship between gate emitter voltage and collector current.

Key Insights

• ✊ The characteristics curve of a power IGBT shows the relationship between collector current and collector emitter voltage.
• ⚡ The threshold voltage is the voltage at which the power IGBT starts conducting current.
• ✊ Once the power IGBT is in the on state, the collector current remains constant for a specific collector emitter voltage.
• 🥺 Increasing the gate emitter voltage leads to an increase in collector current until saturation is reached.
• ✊ The gate emitter voltage needs to be maintained at a specific value for the power IGBT to conduct current.
• ⚡ The power IGBT can be switched on by increasing the collector emitter voltage beyond the threshold voltage.
• ⚡ After saturation, further increases in gate emitter voltage have a minimal impact on the collector current.

Transcript

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Questions & Answers

Q: What is the threshold voltage in a power IGBT?

The threshold voltage is the value of collector emitter voltage at which the collector current starts flowing through the power IGBT. It is the point where the device begins conducting.

Q: How does the collector current behave in the on state of a power IGBT?

In the on state, the collector current becomes constant and flows steadily through the circuit. It remains at this value as long as the collector emitter voltage is above the threshold voltage.

Q: What is the relationship between gate emitter voltage and collector current in a power IGBT?

Increasing the gate emitter voltage beyond the threshold voltage will initially cause the collector current to increase. However, once it reaches saturation, further increases in the gate emitter voltage will not impact the collector current significantly.

Q: How does the power IGBT behave when the gate emitter voltage is varied?

Varying the gate emitter voltage changes the collector current behavior. Increasing the gate emitter voltage leads to an increase in collector current until it reaches saturation. Further increases in the gate emitter voltage will not significantly affect the collector current.

Summary & Key Takeaways

• The video explains that the characteristics curve of a power IGBT shows the rate of change of collector current with respect to the collector emitter voltage.

• The point P on the curve indicates the threshold voltage, beyond which the power IGBT starts conducting current.

• After point Q, the collector current becomes constant and flows through the circuit.