Single tube IGBT encapsulation full-bridge module and encapsulation method thereof

Abstract

The invention discloses a single tube IGBT encapsulation full-bridge module which comprises an oxygen-free copper heat-conducting substrate, a heat-conducting ceramic wafer and a plurality of single tube IGBTs. The heat-conducting ceramic wafer is fixedly arranged on the oxygen-free copper heat-conducting substrate through soldering paste which is evenly spread. The single tube IGBTs are respectively fixed on the heat-conducting ceramic wafer through soldering paste which is evenly spread. Due to the arrangement of the heat-conducting ceramic wafer, a heat dissipation condition that the IGBT module works can be improved, the problem that temperature rising is excessively large when the IGBT module works with high power is effectively solved, the working efficiency of the IGBT module is improved, and the service life of the IGBT module is prolonged. Due to the arrangement of a dust-proof cover, dust and liquid drops can be effectively prevented from entering the IGBT module in the process of using, electric leakage accidents can be effectively prevented from occurring, meanwhile, the external structure of the module is optimized, and the appearance of the module is more concise and elegant. According to the single tube IGBT encapsulation full-bridge module, the production cost of the whole IGBT module can be reduced, and a fault rate of the IGBT module in the process of using is reduced.

Description

technical field [0001] The invention relates to a single-tube IGBT package module, in particular to a single-tube IGBT package full-bridge module and a package method thereof. Background technique [0002] Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor, referred to as IGBT. [0003] The IGBT full-bridge circuit forms currently used in the field of inverter welding machines can be divided into the following types: 1. Two half-bridge IGBT modules form a full-bridge; 2. A dedicated full-bridge package IGBT; 3. IGBT single-tube insulation and heat conduction Film plus PCB board set. [0004] 1. Two half-bridge IGBT modules form a full bridge and a dedicated full-bridge package IGBT: the traditional IGBT module used in inverter welding machines requires two half-bridge modules to form a full bridge to work, and the increase in the number of modules used increases accordingly The production cost of the product is reduced. The bottom area of ​​th...

AI Technical Summary

Problems solved by technology

[0004]1. Two half-bridge IGBT modules form a full bridge and a dedicated full-bridge package IGBT: the traditional IGBT module used by inverter welding machines needs two half-bridges The modules form a full bridge to work, and the increase in the number of modules used increases the production cost of the product accordingly. The bottom area of ​​the wafer of the traditional IGBT module determines the small heat dissipation area of ​​the module itself, so that it cannot dissipate heat well

When using a traditional IGBT module, since there is no anti-static protection measure at both ends of the module wiring, it is easy to break down and damage the module when welding the drive line. Do a good job of anti-static measures to protect the module from breakdown

[0005]2. IGBT single-tube insulating heat-conducting film plus PCB board assembly group: the IGBT single-tube insulating heat-conducting film plus PCB board assembly group currently used in the welding machine field, During use, it is necessary to add a layer of insulating and thermally conductive silicone sheet at the bottom of the IGBT tube. Due to the small thermal conductivity of the insulating and thermally conductive silicone sheet, it is only 0.8w / m*k--4.5w / m*k, resulting in the IGBT tube being used There are certain heat conduction defects in the process, which affect the heat dissipation effect of the IGBT tube during the working process, and then affect its working efficiency

At the same time, the thermal paste applied on the insulating and thermally conductive silicone sheet will dry out after a certain period of use, which will affect the normal heat dissipation of the IGBT tube.

Images