Drive synchronous control protection method and device applied to igbt series power modules

Abstract

The present invention provides a method and device for driving synchronous control and protection applied to IGBT series power modules, and adjusts the signal output on each transmission path through the transmission delay, eliminating the transmission delay of the main controller in the process of signal transmission The resulting inconsistency improves the transmission accuracy; the multi-channel IGBT drivers on the same bridge arm synchronously receive the master controller to issue a synchronous blocking command according to the fault information, and the multi-channel IGBT drivers realize different signals on the same bridge arm according to the synchronous blocking command. Synchronous blockade of IGBT, so as to realize the consistency of sending and receiving of synchronous blockade commands, and realize the consistency of IGBT synchronous blockade, and realize the synchronous triggering of different IGBTs on the same bridge arm. The technical solution provided by the invention optimizes the dispersion of the IGBT driver only through the communication between the main controller and the IGBT driver without increasing any hardware cost, enhances the synchronization of IGBT triggering and fault protection, and improves the IGBT Reliability of series power module work.

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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