Intrinsically Safe Switching Converter Theoretical Study On Spark Time Limit Of Electronic Control

In order to meet the requirements of intrinsically safe performance,the arc discharge energy generated in the circuit must meet the requirements of GB/T3836.4-2021 standard.Different from the traditional intrinsically safe energy and power limitation methods,dynamic arc recognition and turn-off technology(DART)has emerged in recent years,and on this basis,it has developed into an electronically controlled spark time limit technology.After the electronically controlled spark time limit technology is applied to the switching converter,the residual energy of the converter becomes an important factor affecting the circuit detonation probability.Therefore,it is of great theoretical value and engineering practical significance to study the electronic control spark time limit theory of intrinsically safe switching converters.Based on the mathematical model of arc discharge and non-natural arc discharge in simple inductance circuit,a simplified arc discharge mathematical model of Buck converter with electronic controlled spark time limit technology is established.Firstly,based on this model,according to the different positions in the switching cycle at the time of fault occurrence and the time of shutdown,the relationship between the residual energy of Buck converter after inductance breaking and inductance,capacitance and switching frequency is analyzed in four typical cases,and the influence of inductance,capacitance and switching frequency on the residual energy of Buck converter is explored.Secondly,the non-explosive intrinsic safety criterion of Buck converter is obtained by combining the arc mathematical model and the minimum ignition energy.The circuit parameter design method of intrinsically safe Buck converter which meets the requirements of intrinsic safety performance and electrical performance index is studied.Finally,in order to detect the explosion-proof safety performance of the switching converter,this paper also analyzes the electronic control spark time limit intrinsic safety system,and tests the Power-i performance of the converter.The residual energy is analyzed from the perspective of the electronic control spark time limit,and the evaluation method of the intrinsic safety performance of the switching converter is obtained.It provides a new idea and theoretical support for the non-explosive evaluation of the intrinsically safe switching converter,and also provides a theoretical basis for the evaluation,design and detection of the intrinsically safe switching converter.This research has certain reference significance for the design and detection of intrinsically safe switching converters.