IGBT (English full name Insulated Gate Bipolar Transistor) is an insulated gate bipolar transistor, which is the core device of energy conversion and transmission, and the "CPU" of power electronic devices. As a representative product of the third technological revolution of power semiconductor devices, in recent years, with the rise of new energy vehicles and rail transit markets, the market scale has been increasing day by day.
Because the current of the IGBT module is larger, the switching frequency will be higher, and the thermal power consumption of the module will be larger, which will lead to the loss of the IGBT module device and make the temperature of the device too high. If the temperature is too high, the efficiency of the module will decrease, which will affect the overall work progress. Especially those devices that need to work continuously, they are more dependent on IGBT modules and need to have a good heat dissipation system to ensure it. However, if the IGBT module does not dissipate well, it will directly cause damage and affect the operation of the whole machine. It can be seen that the heat dissipation of IGBT is the top priority, and the following article will introduce the thermal conductive materials used in IGBT heat dissipation modules.
IGBT applies thermal grease
The substrate in an IGBT module is generally connected to a heat sink by means of thermal grease. Thermal grease, on the other hand, is a thermally conductive chemical that is a heat conductor between a semiconductor block and a heat sink, and is an environmentally safe silicone-based thermal conductive product designed to solve overheating and reliability issues.
The most widely used in the industry is the use of high thermal conductivity, high reliability thermal grease, silicone grease can better wetting the interface, reduce the interface thermal resistance, so that the IGBT can quickly dissipate heat, in order to ensure its stable working state.
Properties of thermal grease
Thermal grease, also known as heat dissipation grease, thermal paste, etc., is currently the most widely used heat conductive medium, the material is paste-like liquid, it is based on silicone oil as raw material, and add thickeners and other fillers, after heating and decompression, grinding and other processes after the formation of a kind of ester, the substance has a certain viscosity, no obvious particle, can effectively fill a variety of gaps. Main application environment: between high-power heating components and heat sinks.
The main features of thermal grease are:
Excellent thermal conductivity with low oil separation;It is not solid, non-solid, non-melting, tasteless and non-toxic.
Excellent insulation performance, no corrosion of the substrate, stable chemical and physical properties.
It is resistant to high and low temperature, water, ozone and climate aging, and can be used in high and low temperature environments for a long time.
Good thixotropy, moderate consistency, easy to use, and simple MOSFET coating or potting process.
DOWXI thermal grease is recommended