Yi Liu, Xibo Feng, Lin Fuchang
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, HuaZhong University of Science and Technology (HUST), Wuhan, China.
Rev Sci Instrum. 2011 Aug;82(8):084703. doi: 10.1063/1.3623797.
A dry-type pulse transformer based on Fe-based nanocrystalline core with a load of 0.88 nF, output voltage of more than 65 kV, and winding ratio of 46 is designed and constructed. The dynamic characteristics of Fe-based nanocrystalline core under the impulse with the pulse width of several microseconds were studied. The pulse width and incremental flux density have an important effect on the pulse permeability, so the pulse permeability is measured under a certain pulse width and incremental flux density. The minimal volume of the toroidal pulse transformer core is determined by the coupling coefficient, the capacitors of the resonant charging circuit, incremental flux density, and pulse permeability. The factors of the charging time, ratio, and energy transmission efficiency in the resonant charging circuit based on magnetic core-type pulse transformer are analyzed. Experimental results of the pulse transformer are in good agreement with the theoretical calculation. When the primary capacitor is 3.17 μF and charge voltage is 1.8 kV, a voltage across the secondary capacitor of 0.88 nF with peak value of 68.5 kV, rise time (10%-90%) of 1.80 μs is obtained.
设计并构建了一种基于铁基纳米晶磁芯的干式脉冲变压器，其负载为0.88 nF，输出电压超过65 kV，绕组比为46。研究了铁基纳米晶磁芯在几微秒脉宽的脉冲作用下的动态特性。脉冲宽度和增量磁通密度对脉冲磁导率有重要影响，因此在一定的脉冲宽度和增量磁通密度下测量脉冲磁导率。环形脉冲变压器磁芯的最小体积由耦合系数、谐振充电电路的电容、增量磁通密度和脉冲磁导率决定。分析了基于磁芯式脉冲变压器的谐振充电电路中的充电时间、比率和能量传输效率等因素。脉冲变压器的实验结果与理论计算结果吻合良好。当初级电容为3.17 μF且充电电压为1.8 kV时，得到了0.88 nF次级电容上的电压，其峰值为68.5 kV，上升时间（10%-90%）为1.80 μs。
