Analysis of causes of power module burning

by:MOSO     2020-02-25
The working process of the power supply module is very special. The working sequence and voltage increase are divided into three sections. Phase 1 is 380 v ac rectification reaching 400VDC, and Phase 2 is to continue to make DC- The LINK capacitor is charged to 570VDC, and Phase 3 is to wait for the pulse enable signal to appear and boost DC-LINK voltage to 600VDC. Due to the provision of start-up, drive enable and pulse enable signals at the same time, the interval between the above three steps is extremely short, and the IGBT rectifier Bridge starts to work as soon as the enable conditions are met, when the IGBT rectifier Bridge and the pulse distribution circuit have large current breakdown or pulse order disorder due to voltage instability, humidity, dust accumulation and other reasons, the surge current will impact the igbt dc side of the coordinate axis power module through the DC bus, this is the root cause of the short circuit burning of the power module. When the IGBT rectifier Bridge is short-circuited, the incoming line reactor should play a certain protective role in preventing the current from rising too fast, and the decrease of insulation capacity will cause a sharp decrease in inductance, which will not effectively play a protective role, this is also a secondary reason for the burning of the power module. The normal supply range of voltage in China is 380 (1-15%)V--380 (1 + 10%)V ac. And Siemens power supply module voltage requirements: 38 0 5 v ac, when the power supply exceeds the voltage required by Siemens, the self-protection function of the power supply module (Fuse) It will be lost, and the fuse and the associated three electrical components will be broken down at the same time, resulting in the burning of the power module. The power supply module is a power supply that can be directly mounted on a printed circuit board, and is characterized by being a dedicated integrated circuit (ASIC), Digital signal processor (DSP) , Microprocessor, memory, field programmable gate array (FPGA)And other digital or analog loads to provide power. In general, such modules are called load points (POL) Power supply system or point-of-use power supply system (PUPS). As the modular structure has many advantages, the module power supply is widely used in the communication fields such as switching equipment, access equipment, mobile communication, microwave communication, optical transmission, router, automotive electronics, aerospace, etc. Dear Customer: Hello, our company is a high-quality development group with strong technical force, providing high-quality products, complete solutions and superior technical service companies for the majority of users. The main products are switching power supply, LED driver, etc. The enterprise adheres to the tenet of establishing a career with integrity, keeping its career with quality and forging ahead, continuously climbing new peaks with a firmer pace, and making contributions to the national automation industry, welcome new and old customers to rest assured to buy their favorite products. We will serve you wholeheartedly!
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