Main Applications of IGBT
2024-09-11 11:06
In the last issue, we introduced the working principle of IGBT, or insulated gate bipolar transistor. Today, we will share with you some common applications of IGBT, hoping to let you further understand the role of this type of components in the circuit.
In the last issue, it was mentioned that the on-state power consumption of IGBT is considered VCE(sat) rather than RDS(on). In the scenario of low current, the power consumption of IGBT is greater than that of MOSFET; but in some scenarios of high current, IGBT has an advantage.
We all know that P=UI=I2R, where P refers to power, U is the voltage or the voltage drop applied to the device, I is the current when it is turned on, and R is the device resistance. So assuming that in the case of 40A, in the device with the same withstand voltage of 650V, the on-resistance of ordinary silicon MOSFET is expected to be around 80-300mΩ, while the on-state voltage drop of IGBT is between 1-3V. According to the formula, it can be roughly calculated that when the on-resistance of MOSFET is not reduced, the power consumption is much higher than that of IGBT. This is why we should abandon the switching speed of MOSFET and choose IGBT.
Then the advantageous application scenario of IGBT comes out: high current. So which industrial and automotive applications need to use IGBT?
Take the air conditioning compressor in the figure below as an example
The drive of a three-phase motor requires three-way switch control, plus the forward and reverse functions. Normally, six switch devices are needed, and the function of these switch devices is to invert the DC power of the battery into three-phase AC power, thereby driving the motor.
Other application scenarios include automotive battery management systems, motor control, brake control, and charging control;
Automotive main inverter topology
Industrial applications include frequency converters, PCS (power storage converters), UPS (uninterruptible power supply), etc.
Inverter topology
The above is the introduction to IGBT applications. Thank you for watching!
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