摘要
为提高电流互感器（TA）取能电源在启动电流附近时的取能效率、降低死区,推导了其输出功率与滤波电容电压及匝数的关系。并以取能电源最低输出0.5 W为目标,通过软件仿真了在启动电流附近时滤波电容电压及匝数对TA输出功率的影响。得出在不考虑整流桥压降时最大功率与匝数无关。而实际上由于整流桥压降的原因,最大功率与匝数的关系曲线具有饱和特性,并由此给出了二次侧匝数的最优取值依据。通过分析TA取能电源工作点的稳定性问题,得出其稳定工作点为滤波电容电压较高的点,并分析了取能电源在启动电流附近可能出现的无法输出正常功率的现象,进而提出了对DC-DC电路进行控制的方法以保证在该电流时正常启动。最后,设计了一套完整的TA取能装置,通过实验验证了所作分析的正确性。
In order to improve the efficiency of current transformer power supply in the vicinity of starting current and to reduce the dead zone, we derived a relationship among the output power, filter capacitor voltage, and turns. Then, taking the minimum output power 0.5 W as the target, we simulated the influence of filter capacitor voltage and turns on output power in the vicinity of starting current. It is concluded that the maximum power is independent of turns when the voltage drop of rectifier is not considered. However, due to the voltage drop of real rectifier, the curve of maximum power and turns has saturation characteristic, and the turns are determined according to it. It is obtained that the stable operating point is the point of higher filter capacitor voltage by analyzing the stability of the operating point on the output power curve of current transformer. The phenomenon that the power supply may not be able to output normal power in the vicinity of starting current is analyzed, and the solution of controlling the starting of DC-DC circuit is given. A circuit is designed, and the correctness of the analysis is verified by experiments.
作者
娄杰
陈常涛
LOU Jie;CHEN Changtao(School of Electrical Engineering, Shandong University, Jinan 250061, China;State Grid Rizhao Power Supply Company, Rizhao 276800, China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第6期1774-1781,共8页
High Voltage Engineering
关键词
TA取能电源
启动电流
功率输出特性
二次侧匝数
饱和特性
TA power supply
starting current
power output characteristic
turns of secondary side
saturation charac-teristic
