Troubleshooting my IGBT: Vge not Meeting Design Requirement

In summary, the person is trying to turn on their IGBT but is only getting a gate voltage of 8.25V instead of the required 15V. They have researched and are wondering if they need to add parasitic capacitances to their IGBT. However, the concept of parasitic capacitance is not clear and they may actually need to account for parasitic inductances. The gate structure of the IGBT does create a capacitance, so they should estimate the driver's current and power based on this and the switching frequency.
  • #1
onceinalifetim
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currently i need to turn on my IGBT. i measured Vge, it shown 8.25V, but my design requirement of Vge is 15V.
i did some research, do i need to add in parasitic capacitances to my IGBT??
 
  • #3
Sorry this post is not too clear. You already have a circuit and it is supplying gate voltage of 8.75V - and then you mention design requirement - from where? The IGBT Datasheet?
Parasitic Capacitance - ? -- the root word is parasite -- not something you want to add, it may be that you need to account for the parasitic, but usually in IGBTs we have problems with parasitic inductances. The Gate structure does create a capacitance, so you need to estimate the drivers current / power based on this and the Fsw.
 

FAQ: Troubleshooting my IGBT: Vge not Meeting Design Requirement

What is an IGBT?

An IGBT (Insulated Gate Bipolar Transistor) is a type of semiconductor device that combines the advantages of both MOSFETs and bipolar transistors. It is commonly used in electronic devices as a switch or amplifier.

What does Vge stand for?

Vge stands for Gate-to-Emitter voltage, which is the voltage applied to the gate of an IGBT.

Why is Vge not meeting the design requirement?

There could be several reasons why Vge is not meeting the design requirement, such as incorrect wiring, faulty components, or improper circuit design. It is important to carefully troubleshoot each component and circuit to identify the root cause.

How can I troubleshoot Vge not meeting the design requirement?

To troubleshoot Vge not meeting the design requirement, you can start by checking the wiring and connections of the IGBT. Make sure that all connections are secure and there are no loose or damaged wires. You can also use a multimeter to measure the voltage across the gate and emitter terminals to see if it matches the design requirement. If the voltage is not within the desired range, then you may need to check the components and circuit design.

What are some common solutions for Vge not meeting the design requirement?

If Vge is not meeting the design requirement, you can try adjusting the gate resistor value, checking the gate drive circuit, or replacing any faulty components. It is also important to ensure that the IGBT is being operated within its specified limits and that the load is not causing any issues. If none of these solutions work, it may be necessary to consult a specialist or refer to the manufacturer's datasheet for further guidance.

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