Influence of distributed inductance on T-type protection charging circuit of pulse power supply
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摘要: 在使用基于高频开关变换充电技术的充电机对脉冲电源充电时，由于充电回路中分布电感的存在，在高频电流充电过程中，会在充电机T型保护回路两端产生高于充电电压的过电压，存在损坏T型保护回路半导体功率器件的风险；为解决此问题建立充电机及脉冲电源回路仿真模型，通过仿真分析得到充电回路分布感变化对T型保护回路影响的初步规律，然后通过实验进一步验证该规律。为了减少充电回路分布电感对T型保护回路影响，针对性地提出了减少充电回路的分布电感解决方案，主要方法是改变输出线缆类型、长度等措施，并通过仿真与实验来验证该方案的有效性，为脉冲电源工程化应用提供可靠的参考依据。Abstract: When the charger based on the high-frequency switching charging technology is used to charge the pulse power supply, due to the existence of distributed inductance in the charging circuit, during the high-frequency current charging process, overvoltage higher than the charging voltage will be generated at both ends of the T-type protection circuit of the charger, and there is a risk of damaging the semiconductor power devices of the T-type protection circuit. To solve this problem, the simulation model of charger and pulse power supply circuit is established, and the preliminary law of the influence of the distribution inductance change of charging circuit on T-type protection circuit is obtained through simulation analysis, and it is further verified through experiments. To reduce the influence a solution to reduce the distributed inductance of the charging circuit is proposed. The main method is to change the type and length of the output cable. The effectiveness of the solution is verified by simulation and experiment, which provides a reliable reference for the engineering application of the pulse power supply.
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图 5 10 m双绞线，充电电压3 kV、充电电流25 A实验时，充电机T保两端电压波形
Figure 5. Voltage waveform at both ends of charger T-protection circuit in the test with 10 m twisted pair, charging voltage 3 kV, charging current 25 A
图 8 10 m同轴电缆充电电流25 A实验电压波形
Figure 8. 10 m Coaxial cable charging current 25 A experimental voltage waveform
表 1 两种不同长度充电输出线缆的仿真结果
Table 1. Simulation results of two charging output cables with different lengths
twisted pair length/m inductance/μH charging voltage/kV voltage at both ends of
T-protection circuit/kVovervoltage/kV 10 12.56 3 3.60 0.60 6 7.36 1.36 22 27.64 3 4.71 1.71 6 8.30 2.30 
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表 2 同轴电缆实验仿真数据对比
Table 2. Comparison of simulation data of coaxial cable experiment
coaxial cable
length/minductance/μH charging
voltage/kVT-protection overvoltage/kV simulation experiment 10 14 3 3.34 3.39 6 6.40 6.44 22 31 3 3.39 3.43 6 6.71 6.75
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表 3 双绞线、同轴电缆T保两端过电压对比统计表
Table 3. Comparative statistical table of overvoltage at both ends of twisted pair and coaxial cable T-protection circuit
cable type inductance/μH charging
voltage/kVvoltage at both ends of
T protection/kVovervoltage/kV 10 m twisted pair 12.56 3 3.60 0.60 10 m coaxial cable 4.10 3.34 0.34 22 m twisted pair 27.64 4.71 1.71 22 m coaxial cable 9.03 3.39 0.39 10 m twisted pair 12.56 6 7.36 1.36 10 m coaxial cable 4.10 6.40 0.40 22 m twisted pair 27.64 8.30 2.30 22 m coaxial cable 9.03 6.71 0.71
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