A power module provided with an electrode arm

Abstract

The invention discloses a power module with a large electrode arm. The module comprises a DBC, an output electrode and a plurality of power supply electrodes. Each power supply electrode comprises a leading-out portion, a main body portion, a connection portion and a welding pin. The leading-out portion is connected to the main body portion. The main body portion is connected to the welding pin through the connection portion. The welding pin is connected to the DBC. The connection portion comprises a large arm and a small arm. Each large arm is connected to one small arm. The large arm is connected to the main body portion. The small arm is connected to the welding pin. In the invention, through arranging the large arm between the main body portion and the welding pin of each power supply electrode, the large arm is used to connect the small arm and the welding pin; through adjusting a width of each large arm respectively, a resistance and a stray inductance of each parallel loop can be balanced; the large arms are stacked so that the stray inductance of the power module provided with the large arms can be reduced and dynamic current sharing performance of the module is increased.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a power module provided with an electrode arm. Background technique [0002] The power module is a power switch module packaged by power electronic devices such as MOS transistors (metal oxide semiconductors), IGBTs (insulated gate field effect transistors), and FRDs (fast recovery diodes) according to certain functions. Power conversion in various occasions such as automobiles, photovoltaic power generation, wind power generation, and industrial frequency conversion. [0003] In the existing power modules, the distances from the DBC (Direct Bonding Copper, insulating copper-clad substrate) power supply connection node to the electrode lead-out part are different. Taking a three-level power module as an example, such as figure 1 As shown, it is an existing power module, including DBC1, output electrode 2, intermediate electrode 3, positive electrode 4 and negative electrode 5, w...

AI Technical Summary

Problems solved by technology

[0003] In the existing power modules, the distances from the DBC (Direct Bonding Copper, insulating copper-clad substrate) power supply connection node to the electrode lead-out part are different. Taking a three-level power module as an example, such as figure 1 As shown, it is an existing power module, including DBC1, output electrode 2, intermediate electrode 3, positive electrode 4 and negative electrode 5, wherein, the welding leg on each DBC1 among the six DBC1 is the power connection point The distances to the electrode lead-out parts 6 connected to the DBC are not all the same, resulting in differences in the stray inductance and resistance between the DBC power supply connection point and the electrode lead-out parts 6, further affecting the dynamic current sharing of each parallel power switch chip of the power module performance

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