What are the "three-electric system" and "electric drive system"? IGBT module structure and automotive IGBT module application

8. What tests and verifications are required for automotive IGBT modules?

The requirements for product performance and quality of automotive IGBT modules are significantly higher than those in the consumer and industrial control fields. Therefore, automotive certification has become the most important barrier to the automotive IGBT module market. Generally speaking, automotive-grade IGBTs require a vehicle model introduction cycle of about two years.

The automotive IGBT module testing standards mainly refer to AEC-Q101 and AQG-324. At the same time, car companies will put forward corresponding requirements based on the characteristics of their own models. The main testing methods include: parameter testing, ESD testing, insulation withstand voltage, mechanical vibration, mechanical shock, high temperature aging, low temperature aging, temperature cycling, temperature shock, UHAST (high temperature and high humidity without bias), HTRB (high temperature reverse bias), HTGB (high temperature debiased), H3TRB/HAST (high temperature and high humidity reverse bias), power cycling, and solderability.

Among them, power cycling and temperature cycling are representative durability tests with extremely strict requirements. For example, the number of power cycles may range from tens of thousands to hundreds of thousands. The main purpose is to test the durability of mechanical connection layers such as bonding wires and solder layers. The failure mechanism during the test is mainly that the thermal expansion coefficients of chips, bonding wires, DBCs, solders, etc. are inconsistent, resulting in bonding wires falling off, breaking, chip solder layer separation, and solder aging.

Chinese Automobile

IGBT Market Situation

With the rapid development of the domestic new energy vehicle industry, the upstream of the industry chain is gradually completing domestic substitution and even leading the world trend, such as vehicle brands, power batteries, battery materials, etc. have already taken a relatively advanced step. The automotive electronic control IGBT module is the core power device of new energy vehicles. It has been monopolized by foreign suppliers such as Infineon, ON Semiconductor, Semikron, Mitsubishi Electric, etc., but with the rise of domestic suppliers such as BYD Semiconductor, Star Semiconductor, CRRC Times, Silan Microelectronics, Cuizhan Microelectronics, etc., it can now meet domestic demand to a certain extent. I believe that in the near future, domestic automotive semiconductor companies will be bigger and stronger!