Intelligent power module with input buffer anti-interference function

Abstract

The invention discloses an intelligent power module with an input buffer anti-interference function, comprising a bridge driver chip, a first power device, a second power device, a third power device, a fourth power device, a fifth power device and a sixth power device which are connected with the bridge driver chip, and fly-wheel diodes connected with the power devices in a one-to-one correspondence manner. Corresponding to each power device, a filter circuit connected with the logic input end of the bridge driver chip and making the control signal of the logic input end stable and free of interference is arranged. Each filter circuit comprises a bypass capacitor, a filter capacitor, and a voltage stabilizing diode. The input anti-interference capability of the module is improved, the three-phase bridge power devices can work more reliably and more stably, damage to the three-phase bridge power devices inside the module due to instable input signals and external interference is prevented, and better frequency conversion control is realized.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an intelligent power module drive circuit and an intelligent power module. Background technique [0002] Intelligent Power Module, or IPM (IntelligentPowerModule), is a power drive product that combines power electronics and integrated circuit technology. The intelligent power module integrates high-speed, low-power switching devices and high-voltage drive circuits. Compared with traditional discrete device solutions, it has the advantages of high integration and high reliability, and thus wins a growing market. The frequency converter and various inverter power sources have been widely used, and become an ideal power electronic device for frequency conversion speed regulation, metallurgical machinery, electric traction, servo drive, and frequency conversion home appliances. [0003] figure 1 It is a diagram of the internal circuit structure of a typical aluminum substrate-...

AI Technical Summary

Problems solved by technology

[0004] In existing applications, the control drive signal of the bridge driver chip inside the module is directly controlled by the logic high and low levels input by the external central control chip. In this way, the drive signal provided by the external central control chip is implemented through the external PCB wiring. Connection, the signal is transmitted from the central control chip to the control signal input terminal of the module driver chip. Due to the limitation of external PCB space and layout, there is usually a relatively long distance between the central control chip and the input terminal of the module driver chip, and the long metal connection line is easily damaged. External signal interference greatly reduces the reliability of the intelligent power module, and even directly causes the upper bridge and the lower bridge IGBT to form a path, resulting in IPM overcurrent breakdown and burning

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