Synchronous driving control protecting method and device applicable to IGBT series power module

Abstract

The invention provides a synchronous driving control protecting method and device applicable to an IGBT series power module. The method is characterized in that the signal output of each transmission path is adjusted by sending delaying, so that the inconsistency caused by transmission delay in signal transmission process of a main controller can be removed, and the transmission accuracy can be improved; a multi-way IGBT driver on the same bridge arm is used for synchronously receiving a synchronous lock command released by the main controller based on the fault information and then performing synchronous locking of different IGBTs on the same bridge arm according to the synchronous lock command, thus the synchronous lock command receiving and sending consistency can be ensured, and the IGBT synchronous locking consistency is realized, and moreover, the different IGBTs on the same bridge arm can be synchronously triggered. According to the abovementioned technical scheme, the method and the device have the advantages that the dispersing performance of the IGBT drivers is optimized through the communication between the main controller and the IGBT drivers on the premise that no hardware cost is increased, so that the IGBT triggering and fault protection synchronism can be improved, and the reliability of the IGBT series power module in working can be improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a drive synchronization control protection method and device applied to IGBT series power modules. Background technique [0002] Since the H-bridge power module based on IGBT cascading and the MMC power module based on IGBT cascading require a large number of modules to be cascaded, occupy a large area, and control difficulty increases geometrically, so the application of IGBT cascading power modules has become an inevitable trend. . Current IGBT series power modules include such as figure 1 The shown MMC power module based on IGBT series and as figure 2 The H-bridge power module based on IGBT series connection is shown. figure 1 The shown MMC power module based on IGBT series includes a main controller, an upper bridge arm circuit and a lower bridge arm circuit. An IBGT driver and N power supplies for supplying power to the IBGT driver. The main controller is con...

AI Technical Summary

Problems solved by technology

Therefore, the consistency between the IGBT driver outputs cannot be maintained (especially, the difference between the digital driver outputs is as high as 40ns), and when the IGBT driver consistency difference exceeds 20ns, it will significantly affect the voltage equalization characteristics of the series IGBTs. Not suitable for high voltage series applications

Secondly, when the IGBT in the circuit fails, the IGBT driver directly acts to turn off the respective IGBT for protection, instead of reporting the fault information to the main controller, and the main controller will issue a shutdown command uniformly, which will lead to the same Part of the IGBT on the bridge arm is turned on, and part of the IGBT is turned off, and the IGBT in the off state will independently bear the bridge arm voltage, which far exceeds the voltage rating of the IGBT, which will lead to the expansion of the fault

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