IGBT heat dissipation upgrade: the perfect combination of SIGR 2235 thermal grease and screen printing technology
In the fields of new energy vehicles, rail transit, industrial control, etc., IGBT is the “big heart” of power control, but it is also a “big fan” of heat generation. High temperatures not only shorten lifespan, but may also lead to malfunctions or even shutdowns. So, how to make IGBT work calmly?The answer is: high-performance thermal conductive material+precise coating processPain points in thermal management – three major challenges in IGBT module heat dissipationHigh power density → instantaneous high heat generationPoor working environment → -40 ℃~150 ℃ long-term fluctuationHigh interface thermal resistance → Small air gaps hinder heat conductionApplication of screen printing thermal conductive silicone grease process in IGBT Thermal conductive materials play a crucial role in the heat flow path, effectively controlling the temperature inside the module by conducting the heat from active devices to the external environment. The heat flow within the module depends on the layers in contact along the path.Technological breakthrough – screen printingUnlike traditional slurry coating methods, screen printing technology only applies thermal conductive compounds to the required areas. During this process, the required amount of thermal conductive compound is determined by scanning the substrate surface.Application of screen printing thermal conductive silicone grease process in IGBTThe blue or purple line represents the metal contact area with the heat sink, while the red line indicates the area that has not formed thermal contact with the heat sink. The cavities on the substrate need to be filled with thermal conductive compounds. To determine the required amount of thermal paste, the surface scanning area needs to be divided into a grid like distribution. For each grid point, it is necessary to accurately calculate the sufficient amount of thermal paste to be added. Comparison between using screen printing and not using screen printing technologyUniform and controllable coating thicknessSuitable for large-scale…
