WATER COOLING TECHNOLOGY FOR IGBT
IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor, is a composite fully controlled voltage-driven power semiconductor device composed of BJT (bipolar transistor) and MOS (insulated gate field effect transistor), and has MOSFET The advantages of both the high input impedance and the low turn-on voltage drop of the GTR. The GTR saturation voltage is reduced, the current carrying density is large, but the driving current is large; the MOSFET driving power is small, the switching speed is fast, but the conduction voltage drop is large, and the current carrying density is small. The IGBT combines the advantages of the above two devices, with low driving power and reduced saturation voltage. It is very suitable for converter systems with DC voltages of 600V and above, such as AC motors, inverters, switching power supplies, lighting circuits, traction drives, etc.
IGBT is the core device of energy conversion and transmission. It is commonly known as the “CPU” of power electronic devices. As a strategic emerging industry, it is widely used in rail transportation, smart grid, aerospace, electric vehicles and new energy equipment.
Under normal circumstances, the current flowing through the IGBT module is large, and the switching frequency is high, which causes the loss of the IGBT module device to be relatively large, so that the temperature of the device is too high, and the poor heat dissipation of the IGBT module may cause damage to the working operation of the whole machine. The cause of overheating of the IGBT may be that the driving waveform is not good or the current is too large or the switching frequency is too high, and the heat dissipation may be poor.
If the temperature is too high, the working efficiency of the module will decrease, which will affect the overall work progress. Especially for those devices that need to work continuously, the reliance on IGBT modules is greater, and a good cooling system is needed to ensure. Speaking of the heat dissipation method, the most commonly used passive fin heat dissipation, air cooling and heat dissipation, these heat dissipation methods, low cost, easy to use and widely used. However, there are also many constraints. The accumulation of heat cannot be dissipated in time, and the heat dissipation effect quickly reaches the bottleneck. In this case, the IGBT module faces great difficulties.
In this case, the new heat dissipation method must replace the traditional heat dissipation mode. Water cooling is a fast-growing way, and it has been outstanding in the field of heat dissipation in recent years. The water-cooling heat dissipation utilizes the characteristic that the specific heat capacity of the liquid is greater than that of the air, so that the heat is quickly and fully absorbed, and the heat is discharged through the circulation system to dissipate the heat, and then return to the waterway system. The process of reciprocating and reciprocating, to continuously dissipate heat, if you encounter peak heat, you can also respond more calmly. With the advancement and continuous improvement of water cooling technology, today’s water cooling is safer and more durable, and the cost is also reduced. Although it is a little inconvenient in terms of installation and maintenance, in the long run, water cooling technology is worth putting into use.