导通时延抖动对无电抗器电容型脉冲电源的影响

Influences of Turn-on Delay Jitter on the Non-inductor Capacitive Pulsed Power Supply

无电抗器电容储能型电源技术是提升高功率脉冲电源小型化与轻量化水平的有效途径之一,可加速推动电磁轨道发射技术的工程化应用。该型电源工作期间,晶闸管导通时延抖动是影响电源系统安全运行的重要因素。该文建立大功率晶闸管与动态负载的子电路模型,并通过模拟试验验证模型的准确性,结合系统输出性能与半导体开关性能进行对比分析,研究先导通模块的抖动阈值,为电源设计提供参考。结果表明:去除脉冲电抗器后,系统效率提升2.13%,导通时延抖动对系统输出性能影响极小;当出膛速度一致时,更高的系统效率使得无电抗器电源的小型化、轻量化水平进一步提升,体积减小了23.1%,质量减少了18.9%;导通时延抖动影响先导通模块晶闸管的运行安全,应关注高电流上升率以及由此可能引起的电流尖峰;在0.1μs的抖动阈值内,提高导通模块数可有效降低先导通模块的电流上升率;以晶闸管电流上升率限值为边界条件,导通模块数随导通时延抖动的增大以幂函数形式增加。根据系统性能分析,该型电源在增强型电磁轨道发射系统中具备工程可行性。

The Non-Inductor Capacitive Pulsed Power Supply(NICPPS) is one effective way to achieve the miniaturization and lightweight of the pulsed power supply,thus greatly facilitating the engineering progress of the electromagnetic launch technology.During the operation process of the NICPPS,the turn-on delay jitter of the thyristor is an important factor which can affect the reliability of the NICPPS,and its influences need to be taken into serious consideration.In this paper,based on the sub-circuit model of the high-power thyristor and the dynamic load,the performances of system outputs and semiconductor switches are both compared and analyzed,and the simulation is verified by the experiment.The jitter threshold of the first conducted module is discussed,which can be used as a frame of reference for the further development of the NICPPS.The result shows that the system's efficiency rises by 2.13 % without pulse forming inductors,and the output performances are insignificantly affected by the turn-on delay jitter.The higher efficiency makes further improvements on the miniaturization and lightweight of the NICPPS on the condition of the equal muzzle velocity.The system's volume and weight decrease by 23.1 % and 18.9 %,respectively.However,the turn-on delay jitter has a negative impact on operation safety of the thyristor in the first conducted module.Attention must be paid to the high rate of current rise,which could cause the current spike.When the jitter threshold of the first conducted module is not greater than 0.1μs,the increase in the number of conducted modules can reduce the rate of current rise in the first conducted module effectively.Taking the limit value of the rate of current rise as boundary condition,the number of conducted modules rises in the form of power function with the linear increase of the turn-on delay.According to the analysis of the system performances,the NICPPS is feasible for the augmented railgun system in terms of engineering application.