Current threshold judgment-based pre-withdrawing saturation driving method of reverse conduction IGBT gate pole

Abstract

The invention relates to a current threshold judgment-based pre-withdrawing saturation driving method of a reverse conduction IGBT gate pole. An external power MOSFET is arranged in the reverse conduction IGBT gate pole and has an effect of flexibly converting a driving level. By the driving circuit, the running mode of the reverse conduction IGBT can be monitored in real time, an average currentpassing through the circuit is obtained by a current measurement method, thus, whether a voltage of the gate pole is needed to be changed is judged, the dynamic and static characteristics of an integrated diode in the reverse conduction IGBT are optimized, the dynamic and static loss of a three-phase inversion system is reduced, and the system efficiency is improved; through calculation, the system capacity can be improved by about 30% on the premise that the volume is maintained unchanged when the pre-withdrawing saturation gate pole driving circuit is applied to a three-phase inverter, the loss release is reduced by 10-15%, and the electric energy can be saved by 10-12% by an IMW-level three-phase inverter.

Description

technical field [0001] The invention relates to the technical field of rail transit energy saving, in particular to a reverse conduction IGBT gate pre-desaturation driving method based on current threshold judgment. Background technique [0002] In modern rail transit traction drive systems, IGBTs are used to form a rectifier and an inverter to form an energy transfer path. The AC voltage on the transformer side is converted into a kV-level DC voltage through the traction rectifier, and the DC link is stabilized, and finally through the three-phase traction inverter. Converter into three-phase AC voltage, connected to the traction motor, so as to drive the train. Generally, the capacity of the IGBT module determines the power level of the traction converter system. The reverse conduction IGBT module replaces the traditional IGBT+ anti-parallel diode package module, which has higher power density, better system thermal characteristics, and lower loss. The traction converter ...

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Problems solved by technology

[0008] This method needs to combine the judgment of the diode mode and the accurate identification of the diode turn-off time. It involves a lot of logic timing problems, and it is difficult to implement. Once a small fault occurs in the timing logic, it may cause abnormal operation of the system, and When the current is small, the waveform is prone to oscillation

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