Design of Signal Conditioning Circuit in Power Electronics Experimental Drive Module
In the operation of power electronics experiments,due to the use of twisted pair connections between modules,some interference signals are coupled on the adapter wires,which can mislead the switch tubes inside the module,leading to frequent damage to the switch tubes and drive modules,reduce the success rate and safety of the experiment.Therefore,based on the working principles of the control module and drive module in the experimental box,combined with the generation path of inter-ference signals,this article designs a signal conditioning circuit added in front of the drive module.The conditioning circuit uses two-stage conditioning for limiting,filtering,reshaping and logical double interlock the input signal of the drive module.Simu-lation and practical testing show that the conditioning circuit can effectively filter out line interference.It can prevent the switch tubes of the upper and lower bridge arm in the module from direct short circuits,reduces the damage rate of the switch tubes and drive chips by 18.0 percentage points and 13.5 percentage points,respectively.
万方数据
维普
