Regarding the IGBT conduction angle issue
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I ran into a question today: our company has an inverter, which is from Spanish company PE. The IGBT often causes the system to shut down due to overheating. It’s a Delta inverter; we checked and found that its built-in fan is working properly, and the indoor temperature isn’t high either – we’re in the northeast region. The people from the inverter manufacturer said that a temperature of less than 100 degrees is no problem, but I don’t think that’s right. I still don’t know what the maximum temperature that an IGBT can withstand is Also, does the IGBT reach a higher temperature when the conduction angle is large or when it is small? I would appreciate some advice from fellow sailors, thank you
The high temperature rise of IGBT elements is determined by the inherent properties of the elements themselves. As we all know, when a semiconductor power device is turned off, only the leakage current causes no heating. When in conduction, the junction voltage is very low, and the device loss is also minimal. It is only related to the transition time of the amplification region during the on and off transition processes, because it is only then that the losses in the elements of the amplification region are greatest, and time determines the temperature rise of these elements.
IGBT components are semiconductors that, in application, do not have an on-angle issue; they exist only in two states: on and off. Controlling the magnitude of the output depends solely on the length of the conduction time.
Reply to 3# czywqa: So, during the on and off periods of an IGBT, is it the voltage or the current that is adjusted? How does a frequency converter achieve simultaneous increases and decreases in voltage and current? Thank you
It is not about regulating voltage or current; rather, it involves generating positive and negative pulse voltage signals that cause the IGBT element to turn on or off. These signals force the IGBT element to switch on and off, allowing control over the duration for which it remains on, thereby controlling the level of the output voltage and ultimately determining the speed of the motor.