In this paper, the characteristics of an atmospheric pressure helium plasma jet generated by a dual-power electrode （DPE） configuration are investigated by using a two-dimensional fluid model. The effect of a needle...In this paper, the characteristics of an atmospheric pressure helium plasma jet generated by a dual-power electrode （DPE） configuration are investigated by using a two-dimensional fluid model. The effect of a needle electrode on the discharge is studied by comparing the results of the DPE configuration with those of the single ring electrode configuration. It is found that the existence of the needle leads to the generation of a helium plasma jet with a higher propagation velocity, higher species density, and larger discharge width. Furthermore, the influences of the needle radius and needle-to-ring discharge gap on the generation of a plasma jet are also studied. The simulation results indicate that the needle electrode has an evident influence on the plasma jet characteristics.展开更多
针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可...针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10775026,11275042,11305026,and 11405042)
文摘In this paper, the characteristics of an atmospheric pressure helium plasma jet generated by a dual-power electrode （DPE） configuration are investigated by using a two-dimensional fluid model. The effect of a needle electrode on the discharge is studied by comparing the results of the DPE configuration with those of the single ring electrode configuration. It is found that the existence of the needle leads to the generation of a helium plasma jet with a higher propagation velocity, higher species density, and larger discharge width. Furthermore, the influences of the needle radius and needle-to-ring discharge gap on the generation of a plasma jet are also studied. The simulation results indicate that the needle electrode has an evident influence on the plasma jet characteristics.
文摘参考IEEE Std 493-2007《IEEE Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems》对一些典型的建筑供配电系统实例进行分析,并对双电源切换开关的使用提出建议。
文摘针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。
