A Reverse Conduction IGBT Gate Pre-Desaturation Driving Method Based on Current Threshold Judgment

Abstract

The invention relates to a reverse conduction type IGBT gate pre-desaturation driving method based on current threshold judgment, using an external power MOSFET in the reverse conduction type IGBT gate to achieve flexible conversion of the drive level, and the drive circuit can be monitored in real time The operation mode of the reverse conduction IGBT, and the average current flowing through the circuit is obtained through the current measurement method, so as to judge whether it is necessary to change the gate voltage to optimize the dynamic and static characteristics of the internal integrated diode of the reverse conduction IGBT, thereby reducing the three-phase The dynamic and static loss of the inverter system can improve the system efficiency. After calculation, applying this pre-desaturated gate drive circuit to the three-phase inverter can increase the system capacity by about 30% while keeping the volume unchanged. Reducing 10%-15% loss release, 1MW class three-phase inverter can save 10%-12% of electric energy.

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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