脉冲变压器磁芯重复频率复位电路的研究

徐海鹏; 杨兰均; 张志远; 江宏球; 张立

doi:10.11884/HPLPB201830.170323

脉冲变压器磁芯重复频率复位电路的研究

doi: 10.11884/HPLPB201830.170323

西安交通大学电力设备电气绝缘国家重点实验室, 西安 710049

详细信息

作者简介:
徐海鹏(1992－), 男，硕士，从事脉冲功率技术及其应用研究；xuhaipeng@stu.xjtu.edu.cn

通讯作者:
杨兰均(1968－), 男，教授，从事脉冲功率技术及等离子体技术研究；yanglj@mail.xjtu.edu.cn

中图分类号: TM89
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出版历程
- 收稿日期: 2017-08-25
- 修回日期: 2017-11-01
- 刊出日期: 2018-01-15

Repetitive reset circuit of magnetic core of pulse transformer

State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China

摘要

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。
- 磁芯复位 /
- 脉冲变压器 /
- 硅钢磁芯 /
- 脉冲复位 /
- 重复频率
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.
- magnetic core reset /
- pulse transformer /
- silicon-steel magnetic core /
- pulse reset /
- repetition rates

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图 1 复位电路原理图

Figure 1. Schematic of reset circuits

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图 2 IGBT和SCR的触发信号

Figure 2. Trigger impulses of IGBT and SCR

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图 3 不同复位电容和充电电压下的复位效果

Figure 3. Effectiveness of reset circuit with different capacitance and charging voltage

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图 4 测试电路

Figure 4. Testing circuit

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图 5 有/无复位时的输出电压

Figure 5. Output voltage with /without reset

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图 6 重复频率50 Hz下复位电容两端电压

Figure 6. Voltage of reset capacitor under 50 Hz

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表 1 不同电容电压下磁芯的伏秒积

Table 1. Voltage-second product of magnetic core

C_r / U_Cr	voltage-second product /(kV·μs)
1.5 mF/150 V	30.48
1.5 mF/100 V	30.09
1.5 mF/24 V	5.28
6.6 mF/24 V	29.52
11 mF/24 V	30.12

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表 2 复位效果影响因素

Table 2. Simulated effectiveness of reset circuit

Q=C_rU_Cr	maximum magnetic induction B_m / T	W=(C_rU_Cr²)/2	maximum magnetic induction B_m / T
0.3 mF×200 V	1.78	0.3 mF×200 V	1.78
1.5 mF×40 V	1.70	1.5 mF×90 V	1.77
3 mF×20 V	1.43	3 mF×65 V	1.76
8 mF×7.5 V	0.81	8 mF×40 V	1.74
-	-	16 mF×28 V	1.71

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参考文献(11)

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