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脉冲变压器磁芯重复频率复位电路的研究
Repetitive reset circuit of magnetic core of pulse transformer
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摘要: 为了提高脉冲变压器磁芯的利用率,需要给脉冲变压器施加退磁电流,使磁芯达到负向饱和点以获得最大的磁感应强度增量.研究了一种工作电压在几十伏的重复频率脉冲复位电路,产生反向脉冲电流,实现磁芯复位.研究了不同复位电容容量和充电电压条件下的磁芯复位效果,发现磁芯复位效果与复位电容所储存的能量具有正相关性.综合考虑脉冲变压器工作的要求,选用较低工作电压和较大复位电容容量的方案.对比分析了有无磁芯复位时硅钢带环形磁芯脉冲变压器的磁化特性,说明了加入复位电路的必要性.试验表明,该复位电路在50 Hz重复频率下可长时间稳定运行.Abstract: The demagnetization current is applied to pulse transformer to improve the utilization ratio of the magnetic core.A pulse reset circuit working at low voltage was studied to generate a pulse current contrary to the main discharge current.The effectiveness of magnetic core reset under different capacitances and charging voltages was studied.The result implied that the power saved in the capacitor had a positive correlation with the effectiveness of reset circuit.Considering the output targets,a larger capacitance with a lower working voltage was selected.The output characteristics of the pulse transformer with a toroidal magnetic core emphasized the necessity of reset circuit.Experiments showed that the reset circuit could run steadily for a long time under 50 Hz repetition rate.
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