A power module based on phase change material and its manufacturing method

Abstract

The invention provides a power module based on phase change material and a manufacturing method thereof, which belong to the technical field of power modules. The power module comprises a substrate (1), a ceramic copper-clad plate (2), a phase-change module and a power terminal (7). The upper surface of the substrate (1) is rectangular, a plurality of ceramic copper-clad plates are respectively arranged on the substrate (1), and the ceramic copper-clad plates (2) are connected through a copper bar. The phase-change module is arranged on the ceramic copper-clad plate (2), and a plurality of power terminals (7) are arranged on a power terminal mounting end. The phase change module comprises a heat transfer enhancing frame (3) and a sealing cover (4), and the heat transfer enhancing frame (3)is filled with phase change material. A power semiconductor chip (5) is welded to the outer surface of the sealing cover. The invention is advantageous in that the power module with short-time and controllable junction temperature is provided, which can respond to transient temperature rise of the power module, and is suitable for occasions when short-circuit current is actively provided for supporting the power grid voltage during a power grid fault period, and other impact power occasions of electromagnetic ejection and super-capacitor charging.

Description

technical field [0001] The invention belongs to the technical field of power modules, and relates to a power module based on a phase change material and a manufacturing method thereof. Background technique [0002] With the rapid development of renewable energy, the proportion of power converters in the power system is increasing, and the safety and stability of the power system is increasingly affected by the reliability of power converters. In the power system with high penetration rate of distributed power, when the power system fails, the power converter actively injects reactive power support voltage into the large grid, the current of the converter is several times or even ten times the rated value, and the module loss and The junction temperature will rise sharply. If the junction temperature cannot be effectively controlled, it is very likely to cause thermal failure of the module and seriously threaten the security of the system. In addition, when a short-circuit f...

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Problems solved by technology

[0010] For the application of converters, care should be taken to avoid the introduction of composite materials that will lead to an excessive increase in the thermal resistance from the junction to the case of the module, which will affect the thermal performance of the module in normal operation and cause the normal operation temperature to be too high

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