How to perform avalanche testing of IGBT chips?
Date：2024-08-23
The following are detailed steps and related points on how to conduct IGBT chip avalanche testing:
1. Test Preparation
Test Equipment
With high voltage pulse source: can generate the required high voltage pulse.
Current monitoring equipment: such as high-precision current probes and oscilloscopes for accurate current measurement.
Temperature control device: to ensure that the test is carried out under the specified temperature conditions.
Sample preparation
Select the IGBT chip to be tested and install it correctly on the test fixture or PCB board to ensure good electrical connection.
Safety measures
Test personnel should wear appropriate protective equipment, such as insulated gloves.
Ensure that the test environment meets electrical safety standards and set up warning signs.
2. test parameter setting
voltage pulse amplitude
The initial voltage pulse amplitude is determined according to the specifications of the IGBT chip and the expected avalanche energy. It usually starts from a lower value and increases gradually.
Pulse width
To select the appropriate pulse width, it is necessary to ensure that the avalanche phenomenon can be triggered, and to avoid excessive damage to the chip caused by too long pulse.
Temperature conditions
Set the required test temperature, which is usually room temperature, high temperature (such as 125°C) and low temperature (such as -40°C).
3. Test Steps
Apply an initial voltage pulse
A set voltage pulse is applied between the collector and emitter of the IGBT chip.
Monitoring current
At the same time, the current monitoring equipment is used to monitor the change of current in real time.
Gradually increase the voltage pulse amplitude
If no avalanche phenomenon is observed at the initial voltage, the voltage pulse amplitude is increased stepwise, one appropriate step at a time.
Record Data
Parameters such as voltage, current and temperature were recorded for each test.
Observation of avalanche phenomena
When the current suddenly rises sharply, it indicates that an avalanche phenomenon has occurred.
Stop Test
Stop the test when the specified test conditions are reached or when abnormal conditions occur.
4. Data Analysis and Evaluation
calculating avalanche energy
From the measured current and voltage data, the avalanche energy is calculated by integration.
Compare with specifications
The calculated avalanche energy is compared to the chip's specification or design requirements.
Evaluate reliability
According to the test results, the reliability and performance of IGBT chip under avalanche conditions are evaluated.
For example, if the specifications of an IGBT chip require that it can withstand 100mJ of avalanche energy at a specific temperature, and the test results show that it can actually withstand 120mJ, it means that the chip performs well in terms of avalanche performance.
It should be noted that avalanche testing of IGBT chips needs to be performed in a professional laboratory environment by personnel with relevant experience and skills to ensure the accuracy and safety of the test.
IGBT chip
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