Digital intelligent driving device of high-power IGBT (insulated gate bipolar translator)

Abstract

The invention relates to a digital intelligent driving device of a high-power IGBT (insulated gate bipolar translator). The digital intelligent driving device comprises a DC/DC (direct-current) conversion circuit, a CPLD (complex programmable logic device) logic control module, an active clamping feedback module, a retreating-protection over-current feedback module and a two-stage di/dt detecting module, wherein the output end of the DC/DC conversion circuit is connected with an undervoltage protection module; the output end of the undervoltage protection module is connected with the CPLD logic control module; and the input end of the CPLD logic control module is connected with a PWM (pulse-width modulation) pulse-width modulator, and the output end of the CPLD logic control module is connected with a variable-gate resistance module. The digital intelligent driving device provided by the invention has the advantages that the protection functions such as power isolation, over-current protection, di/dt and active clamping are integrated, the logic control is realized by adopting the programmable logic device CPLD, the ideal driving performance is achieved by real-time variable-gate resistance driving, and soft shut-off is realized by selecting proper shut-off resistance according to the over-current degree, so that the switching loss is effectively reduced and a Miller effect is weakened.

Description

technical field [0001] The invention relates to a high-power IGBT driving device on a megawatt-level converter used in locomotive traction, new energy power generation and other equipment, in particular to a high-power IGBT digital intelligent driving device. Background technique [0002] The existing mature IGBT drive circuits can be roughly divided into three categories: [0003] Single function type: It is mainly composed of optocoupler and power buffer. In practical application, it needs to add isolated driving power supply, logic processing circuit, etc. It is mainly suitable for driving low-power IGBT, and the driving capacity is very limited. If you need to drive IGBT above 600A Not only does it require an external larger power buffer circuit, but it is also more difficult to implement; multi-function type: in addition to providing the function of directly driving IGBT, it can also provide the necessary short-circuit protection function, but there is also the problem ...

AI Technical Summary

Problems solved by technology

[0003] Single function type: It is mainly composed of optocoupler and power buffer. In practical application, it needs to add isolated driving power supply, logic processing circuit, etc. It is mainly suitable for driving low-power IGBT, and the driving capacity is very limited. If you need to drive IGBT above 600A Not only does it require an external larger power buffer circuit, but it is also more difficult to implement; multi-function type: in addition to providing the function of directly driving IGBT, it can also provide the necessary short-circuit protection function, but there is also the problem of limited drive capability; full-function type: Representative products such as the SCALE2 series drive modules of CONCEPT have built-in power supply undervoltage protection and reset functions, but this type of high-power IGBT drive still has many defects, such as the Miller effect of the IGBT and poor soft-off technology.

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