| In order to meet the intrinsically safety requirements for the mine switching converter,the potential arc discharge energy in the circuit must meet the standard.Aiming at the problem of surplus energy after circuit failure and protection operation,this paper conducts theoretical analysis and simulation verification on the problem of surplus energy of intrinsically safe Buck switching converter.Firstly,the circuit analysis of the intrinsically safe Buck switch converter is carried out,and the calculation formula of the maximum residual energy is obtained.The relationship between the maximum residual energy and the circuit parameters is analyzed,It is pointed out that the ratio between the maximum residual energy and the average residual energy is only related to the circuit time constant under the critical condition,which is the inherent characteristic of the circuit.The calculation and analysis of the maximum value of residual energy provide theoretical support for the intrinsically safe circuit to adjust the circuit parameters under the condition of energy constraint.Then,by calculating and analyzing the change of the maximum value of the remaining energy in the Buck switch converter after the circuit is connected to the cable,and analyzing the relationship between the remaining energy and the cable length in the case of open arc in the connected cable.Based on the characteristics of the DART protection circuit,a mathematical model of linear arc current incomplete arc discharge is established,and the proportional change of energy composition is analyzed,which provide a theoretical basis for limiting arc discharge energy.Finally,Pspice simulation was uesd to observe whether the circuit protection is achieved within the specified time and the remaining energy is controlled within a safe range when the DART protection circuit plays a protective role in the Buck circuit.Simulation results further demonstrate the effectiveness of DART protection. |
PDF Full Text Request