Intelligent power module with reinforced sampling anti-electrostatic protection

Abstract

The invention discloses an intelligent power module with reinforced sampling anti-electrostatic protection. The intelligent power module comprises a plurality of IGBTs and sampling circuits, wherein the IGBTs are connected with an HVIC tube; emitters of the IGBTs are connected with anodes of FRD tubes and connected with input / output ends of the sampling circuits; fifth input / output ends of the sampling circuits are taken as an N1 end of the intelligent power module; sixth input / output ends of the sampling circuits are taken as an N2 end of the intelligent power module; in addition, four analog switches are arranged in inside circuits of the sampling circuits; and fixed ends of the analog switches are respectively connected with corresponding input / output ends of the sampling circuits. In a non-electrified state, the power supply of the intelligent power module is subjected to electrostatic protection, the risk of electrostatic breakdown can be effectively prevented, and particularly the risk of electrostatic damage in the assembling process on a production line can be also prevented.

Description

technical field [0001] The invention relates to the design field of intelligent power modules, in particular to the design of protection circuits and electrostatic suppression circuits of intelligent power modules. Background technique [0002] Intelligent Power Module, or IPM (Intelligent Power Module), is a power drive product that combines power electronics and integrated circuit technology. The intelligent power module integrates the power switching device and the high-voltage driving circuit, and has built-in fault detection circuits such as overvoltage, overcurrent and overheating. On the one hand, the intelligent power module receives the control signal from the MCU to drive the subsequent circuit to work, and on the other hand, it sends the system status detection signal back to the MCU. Compared with traditional discrete solutions, intelligent power modules have won an increasing market due to their advantages of high integration and high reliability. They are espe...

AI Technical Summary

Problems solved by technology

[0050] It can be seen that the emitters of the IGBT tube 124, the IGBT tube 125, the IGBT tube 126, and the IGBT tube 127 of the current intelligent power module 100 are directly used as the pins of the intelligent power module 100. During the assembly process of the power module 100, the smart power module 100 is easily threatened by static electricity due to touching the operating table, touching the body parts of workers, etc. If these static electricity appear on the UN, VN, WN, -VP pins between the COM pin and the IGBT tube 124, the IGBT tube 125, the IGBT tube 126, and the IGBT tube 127. Therefore, the design of the current intelligent power module 100 has the defect of being damaged by static electricity during installation.

[0051] In fact, if this kind of damage makes the IGBT tube completely invalid, the detection after the assembly of the intelligent power module can be detected to avoid entering the market, but if the damage only causes slight damage to the IGBT tube, the detection after the assembly of the intelligent power module It will be difficult to be found, and entering the market will cause early failure of the product. IGBT tubes are power devices, and high voltage and high current flow through them. IGBT tubes are prone to overheating and burning at the moment of failure, causing the entire intelligent power module to burst. Heat accumulation may even cause the intelligent power module to explode, and in serious cases, fire and other safety accidents may occur

Images