Research On Modular Design And Heat Transfer Performance Of IGBT Cold Plate Structure

With the development of the new energy industry,high-power IGBT(Insulated Gate Bipolar Transistor)switching devices have been widely used.Solving the problem of heat dissipation is the main task facing the current development.This paper takes the IGBT module FF600R12ME4,which is the most widely used inverter industry,as the research object.In view of the characteristics of IGBTs arranged in multiple modules in practical applications,the modular design method is applied to the IGBT cold plate structure design to provide reference for the IGBT multi-module liquid cooling design.Firstly,this paper established a thermal simulation model of IGBT module,and the single-module multi-channel cold plate structure is proposed.Secondly,the thermal resistance network model and the flow resistance network model of the cold plate are theoretically established respectively.The thermal analysis software Icepak was used to optimize the size parameters and shape parameters of multi-channel regional fin structures,and then the integrated heat transfer factor PF was used to evaluate.Finally,three types of spoiler structures are designed to solve the heat flux concentration problem in the heat source concentrated area.It was found that the integrated heat dissipation capability was improved,but the degree of improvement gradually decreased with increasing flow rate.Even so,at the highest inlet flow rate of 2 m/s,the heat dissipation capacity can also be increased to 1.3 to1.5 times.In this paper,based on the single-module cold plate structure,the U-shaped parallel design idea of the three-module cold plate is proposed and the manufacturing plan was designed.For the problem of unequal distribution of flow in the small channel of each unit,this paper proposes to add three types of splitter structure at the inlet of the unit and found that the maximum heat transfer capacity increased to 1.2 to 1.4 times.In order to solve the problem of unequal flow distribution between different units of the main channel,this paper proposes optimizing?which represents the radius ratio of the main channel of the entrance and?_b which represents the resistance of each unit,and found that?has a greater impact on the uniformity of the flow distribution between different units.For the design of four-module cold plate,four topological connection methods(four strings connection,four parallel connection,two parallel two strings connection-1,two parallel two strings connection-2)have been proposed,and further conclude that the connection method of two parallel two strings connection-2 is optimal.For the optimized four-module and three-module cold plate structure,the IGBT simulation heat source that is consistent with the real heat load and the same size aluminum block heat source are established respectively.The temperature of the IGBT simulation heat source and the aluminum block heat source sampling point was experimentally tested.Compared with the simulation results,the maximum deviation values were 8.4%and 4.5%respectively.The deviation of the pressure drop of three-module coldplate gradually increased with the increase of the flow velocity and the maximum value is 10.9%.