Guang-xi Cui

Xi'an Jiaotong University

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Aici Qiu

Xi'an Jiaotong University

Junna Li

Xi'an Jiaotong University

Yongliang Wang

Xi'an Jiaotong University

Shiji Li

Xi'an Jiaotong University

Jian Liu

Harbin Institute of Technology

Ming Jiang

Xi'an Jiaotong University

Xu-liang Chen

Xi'an Jiaotong University

Yongliang Wang

Shanghai Institute of Microsystem and Information Technology

Haoliang Shi

Xi'an Jiaotong University

Shi He

Xi'an Jiaotong University

Cooperative Institutions

Xi'an Jiaotong University

Northwest Institute of Nuclear Technology

State Key Laboratory of Electrical Insulation and Power Equipment

Harbin Institute of Technology

University of Shanghai for Science and Technology

Guizhou Provincial People's Hospital

Southwest Medical University

Shanghai Jiao Tong University

Shenyang Jianzhu University

Harbin Engineering University

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Simulation of primary current distribution in Tesla-type pulse generators

Review of Scientific Instruments (2022)

Shi He Junna Li Yongliang Wang Guang-xi Cui Xu-liang Chen

In a Tesla-type pulse generator, self-inductance of the primary coil is a crucial parameter to determine the final oscillating condition. However, the accurate value of this inductance might be changed due to the uneven primary current distribution caused by practical configuration of the primary side. Consequently, in order to precisely design the transformer, it is helpful to evaluate the primary inductance based on electromagnetic simulation instead of conventional approximate calculation. In this paper, a simulation model based on the finite integration technique is established to solve the uneven primary current problem. A primary coil with multiple contacting points is designed, and hexahedral mesh generation of the coil is also discussed. Hence, a series of verification tests using different primary structures are performed to support the results of simulation. Both results of the simulation model and the verification test presented that the variation of the primary inductance will affect the performance of the generator, and the number of contacting points is the main cause to determine the maximum current density of the coil.

Equivalent series inductance

10.1063/5.0080311

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Citations (1)

The effect of initial electrons generation approaches on nanosecond pulsed breakdown characteristics

Review of Scientific Instruments (2023)

Yongliang Wang Junna Li Ming Jiang Shiji Li Haoliang Shi

In this paper, the effects of initial electrons generation approaches on nanosecond pulsed breakdown characteristics are analyzed. Based on the numerical simulations with a 3D PIC-MCC model, the impacts of field-enhancement factor and initial electron concentration on nanosecond pulsed breakdown characteristics are investigated. Three types of switches are designed and subjected to testing under pulse voltages with rise times of 40, 70, and 120 ns, respectively. The results can be summarized as follows. First, the field-enhancement factor and initial electron concentration have significant influences on the development of the discharge channel. Second, the cathode-grooved self-triggered switch exhibits lower breakdown time delay jitter than the hemispherical self-breakdown switch at low pressure, while the differences in jitter between the two switches become negligible at high pressure. Third, the cathode-grooved self-triggered switch shows a lower breakdown time delay jitter compared to the pre-ionization self-triggered switch for pulse voltages with rise times of 40 and 70 ns. Conversely, this trend reverses for pulse voltage with a rise time of 120 ns. Finally, the breakdown time delay jitter for both the cathode-grooved self-triggered switch and the pre-ionization self-triggered switch has been reduced, and both switches are suitable for different operating requirements and conditions.

Nanosecond

Rise time

Impact ionization

Pulsed Power

Switching time

10.1063/5.0170882

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