Common methods for detecting the quality of IGBT tubes

testingIGBTThe quality of insulated gate bipolar transistors is an important step in ensuring the normal operation of power electronic devices. Here are some commonly used detection methods:

1. Appearance inspection

· Check the pinsCheck if there are any obvious signs of damage, corrosion, or burning on the pins.

· Check packaging: ObservationIs there any crack, deformation or other physical damage in the packaging of IGBT.

2. Static characteristic testing

· Use a multimeter：

i. Diode testing modeSet the multimeter to diode test mode.

ii. Test gate and emitter：

§ Connect the red probe to the grid and the black probe to the emitter. Under normal circumstances, a certain positive pressure drop should be displayed (usually withinBetween 0.6V and 1.5V.

iii. Test the collector and emitter electrodes：

§ Connect the black probe to the emitter and the red probe to the collector. Under normal circumstances, it should display as open circuit (no conduction).

iv. Test the gate and collector electrodes：

§ Connect the red probe to the grid and the black probe to the collector. Under normal circumstances, it should display as open circuit.

3. Dynamic characteristic testing

· Using an oscilloscope：

i. Connect the test circuitUse a simple test circuit that includes a power supply, a load, and a control circuit.

ii. Apply gate signalApply gate drive signals through control circuits.

iii. Observe waveformObserve using an oscilloscopeCheck the switching waveform of IGBT to ensure that the switching speed, on voltage, and off voltage are within the normal range.

4. Temperature testing

· Heating test：

i. Apply working currentApply current under normal working conditions.

ii. Measure temperatureMeasure using an infrared thermometer or thermocoupleEnsure that the temperature of IGBT is within the safe operating range.

5. functional testing

· Testing in actual circuits：

i. takeInstall IGBT into the actual circuit and observe its working status.

ii. Check if it can conduct and turn off normally, and monitor whether the output voltage and current meet expectations.

6. Short circuit test

· Short circuit protection test：

i. Test under safe conditionsThe short-circuit protection function of IGBT ensures that it can be turned off in a timely manner in the event of a short circuit.

matters needing attention

· Before conducting any testing, ensure thatIGBT is in a power-off state to avoid electric shock and equipment damage.

· During testing, relevant safety regulations should be followed to ensure the safety of the testing environment.

· If unsureIt is recommended to have a professional inspect and replace the IGBT status.

Through the above methods, effective detection can be achievedThe quality of IGBT ensures its normal operation in power electronic devices.