Power device, power module and packaging processes of power device and power module
A technology of power devices and power modules, which is applied in the field of power modules and their packaging technology, and power devices, can solve the problems of poor heat dissipation performance of thermal conductive silicone grease and discount of heat dissipation capacity of power modules, etc., achieve high integration, realize lightweight, reduce The effect of the heat transfer path
Pending Publication Date: 2021-12-03
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology
For a typical water-cooled power module in rail transit, the heat dissipation path of the chip is generally: chip-soldering layer-DBC lining board-soldering layer-thick copper bottom plate-thermal conductive silicone grease-water cooling plate, because the heat dissipation path of the chip is too long, it has a negative effect on heat dissipation In addition, the heat dissipation performance of the thermal grease in the heat dissipation path is very poor, which also greatly reduces the heat dissipation capacity of the power module
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[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0053] Such as figure 1 with figure 2 As shown, the power device of this embodiment is specifically applied to a rail transit converter, and specifically includes a chip 105, a liner 104, and a water cooling plate 101. The liner 104 is located on both sides of the chip 105, and the water cooling plate 101 is directly welded to the Liner 104, thereby forming a double-sided water-cooled structure. The power device of the present invention integrates the substrate and heat sink in the existing power device 1, and directly replaces it with the water-cooled plate 101, which eliminates the heat dissipation silicon grease and thick copper base plate in the heat dissipation path of the chip 105, and reduces the heat transfer path, improving heat dissipation efficiency. Of course, in other embodiments, a single-sided water-cooled structure may also ...
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The invention discloses a power device which comprises a chip, a lining plate and a water cooling plate, the lining plate is located on one side or two sides of the chip, and the water cooling plate is directly welded on the lining plate. The corresponding packaging process comprises the following steps of: coating each connecting surface between the chip and the lining plate with nano-silver paste and then conducting sintering; and coating each connecting surface between the lining plate and the water cooling plate with solder paste, and then conducting brazing connection. The invention further discloses a power module which comprises an external radiator, a middle radiator and power devices disclosed by the invention, the power devices are stacked together through the middle radiator, and the external radiator is located on the outermost power device. The corresponding packaging process comprises the following steps: welding the external radiator on the water cooling plate of the power device through a backfill type friction stir welding technology; and welding the middle radiator on the water cooling plate of the power device through a backfill type friction stir welding technology. The power device and power module have the advantages of simple structure, small volume, high heat dissipation efficiency, high power density and the like.
Description
technical field [0001] The invention mainly relates to the technical field of power modules, in particular to a power device, a power module and a packaging process thereof. Background technique [0002] The converter is called the heart of EMUs and electric locomotives because it can convert and utilize the electric energy introduced from the power grid, and the power module is the converter to realize rectification, inverter, DC-DC conversion, AC-AC The core component of the inverter plays an important role in the normal operation of the EMU and the electric locomotive. At the same time, with the gradual increase of the vehicle speed level, the power level of the power module in the converter is also gradually increasing. To solve the heat transfer problem, it is of great significance to improve the performance and reliability of the module. [0003] In addition, permanent magnet synchronous traction drive systems are gradually being applied in rail transit vehicles, but...
Claims
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IPC IPC(8): H01L23/473H01L23/373H01L21/50
CPCH01L23/473H01L23/3736H01L23/3738H01L21/50
Inventor 贺冠强曾祥浩刘良杰唐洲陈俊吴书舟廖俊翕李聪炟王亮
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD