Driving circuit for dynamic variable IGBT switching characteristics and protection method thereof

Abstract

Provided are a driving circuit for dynamic variable IGBT switching characteristics and a protection method thereof. The driving circuit for dynamic variable IGBT switching characteristics includes a pulse distribution and digital control chip, switch arrays and gate driving resistance arrays; the pulse distribution and digital control chip is connected with the input end of an IGBT upper bridge arm through a part of the switch arrays and a part of the gate driving resistance arrays, and connected with the input end of an IGBT lower bridge arm through the rest switch arrays and the rest gate driving resistance arrays; the pulse distribution and digital control chip receives the control pulse signals of a controller, receives status information fed back by the IGBT upper bridge arm and the IGBT lower bridge arm, outputs control pulse to drive the IGBT upper bridge arm and the IGBT lower bridge arm after completing pulse distribution, pulse self-locking, pulse interlocking and other treatments according to the control pulse signals and the status information, and meanwhile controls the switch arrays to dynamically change gate driving resistances. The switching characteristics are optimized, the switching loss is reduced, and besides, malfunction coding can be fed back to the controller so as to facilitate intelligent malfunction diagnosis.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a driving circuit and a protection method with dynamically variable switching characteristics of an IGBT. Background technique [0002] The insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) is the core device of the power module in the traction auxiliary converter of the high-speed train. As the interface circuit between the power circuit and the controller, the IGBT driver has a great impact on the loss and reliability of the system. It is a key technology that restricts the independent development of the power module. A reasonable driver design is important in the entire power transmission The conversion system plays an important role, especially in high-voltage and high-power applications. How to drive, control and protect the IGBT to ensure the reliable and safe operation of the IGBT is the difficulty and key to the design of the IGBT drive...

AI Technical Summary

Problems solved by technology

The underlying protection of the IGBT is mainly accomplished through the "analog drive circuit", which has a single form and a single protection level; for high-power IGBT drive circuits, the drive protection scheme is mostly "controller + analog pulse distribution circuit + analog drive circuit"

Compared with the low-power level driving scheme, an "analog pulse distribution circuit" is added, but this level of circuit generally does not have a protection function or has a single protection function

[0004]In addition, the traditional IGBT driver composed of analog circuits cannot intelligently and dynamically control the IGBT on-off process and has a single protection strategy, which cannot meet the control performance of high-power IGBTs and protection requirements

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