Regis Heat sink Technology Co., Ltd. is a professional manufacturer of heat dissipation processing. Regis's products and services include various heat sinks, structural parts, heat dissipation analysis and heat dissipation scheme design. Our products are widely used in telecommunications, aerospace, automotive, industrial control, power electronics, medical equipment, security electronics, LED lighting and multimedia/consumer fields.
The heat generated by the power module during operation is transferred to the outer surface of the main cavity in a thermally conductive manner through its mounting contact surface, and then the heat is diffused from the outer surface of the main cavity to the inner surface of the main cavity in a thermally conductive manner, and finally the heat is transferred by convection heat. The circulating coolant is transferred from the water-cooled plate to the external environment. When the whole system reaches thermal equilibrium, the surface temperature of the main cavity will be maintained at the normal working temperature of the power module.
At present, there are several mainstream water-cooling plate processes: copper tubes are bent and buried in the bottom plate, the bottom plate is machined and welded (including the fin design in the flow channel), and the complex combined pipeline type. The machining flow channel of the bottom plate is divided into vacuum brazing, friction stir welding and other processes according to the different welding methods. The fins in the runner can also be divided into many types according to the process, such as profiles, shovel teeth, welding, twisted pieces and so on.
First, a mounting groove with a groove width and size that matches the outer diameter of the water-cooled tube is machined on the base plate by machining, and then the pressure plate with a flat molding surface is placed on the water-cooled tube, and pressure is applied to the pressure plate to make the water-cooled tube embedded and installed in the slot. The water-cooling plate processed by this method has the following problems: there is a gap between the water-cooling tube and the installation groove, resulting in a large thermal resistance and poor heat dissipation; the water-cooling tube is easily squeezed and deformed, resulting in the contact between the water-cooling plate and the electronic products The reduction of the area will affect the heat dissipation effect. More importantly, if the middle of the water-cooling tube is recessed, and the recess is serious, it will not be used as a heat source surface.
First, a mounting groove with a groove width slightly larger than the outer diameter of the water-cooled pipe is machined on the base plate by machining, then the water-cooled joint is welded to the water-cooled pipe, and then the water-cooled pipe with the welded water-cooled joint is arranged in the installation groove. And apply solder paste in the gap between the water-cooled tube and the installation groove, and fix the water-cooled tube and the substrate with a fixture, and then send the fixed water-cooled plate to the heating furnace for heating to melt the solder paste and fully fill the water-cooled tube. and the gap between the mounting slot, and finally cool down and remove the clamp. This method easily leads to the failure of the sealing performance of the water-cooled joint due to the need to heat the solder paste at high temperature, the product qualification rate is low, and the cost is high (the solder paste is expensive), and the thermal resistance of the water-cooled plate is large due to the low heat dissipation coefficient of the solder paste. , the cooling effect is not good.
Friction Stir Welding (FSW) cold plates are suitable for glycol-water and very high cooling needs, while the press lock tube type is ideal for tap or deionized water.
Water cooling radiators are made of high thermal conductivity copper or aluminum. The water circulation system is embedded in the liquid cooling plate, and the electronic components are directly fixed on the water cooling plate.
As long as it is a high-power device radiator, the water-cooled plate radiator used in inverters, inverters, SVG and other equipment basically prefers to use friction welding, which is better and more stable.