The Development of Bipolar Marx Pulse Generator Based on Magnetic Isolated Driver
Dong Shoulong1, Zhou Xiaoyu1, Yu Liang1, Liu Xin1,2, Yao Chenguo1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400030 China; 2. Institute of Electronic Engineering China Academy of Engineering Physics Mianyang 621999 China
Abstract：In liquid food sterilization, a bipolar high-voltage pulsed electric field provides a better sterilization effect and inhibits electrode corrosion to prevent food contamination. Traditional bipolar Marx pulse generator contains the main and truncated switches (MS&TS). The MS and TS are usually driven by an optical fiber signal, and the optical fiber modules are powered by DC isolated sources. Hence, the output amplitude of the bipolar Marx generator is limited by isolated DC sources, making it difficult to achieve high-voltage output. The conventional magnetic isolated driver can solve the high overhang problem of driving potential, but needs to meet the control requirements of these two types of switches. Therefore, this paper proposes a design of the bipolar pulse generator based on a magnetic isolated drive. It can solve the problem of high-voltage isolated drive and meet the control requirement of bipolarity, finally realizing the bipolar high-voltage pulse output. Firstly, the circuit design is carried out in this paper. The dual Marx-type circuit topology is adopted for the main circuit of the bipolar pulse generators. The drive circuit for this topology uses the magnetic core to transfer the control signal, including core stacking, in-phase winding, and inverse paralleled winding. It only needs one drive signal to realize the synchronous conduction of the MS or TS, and the complementary conduction of both. To ensure a reliable deadtime between the complementary conduction, the gate resistance value of the sub-driver circuit of the magnetic isolated drive is adjusted accordingly. The gate different resistance values of the sub-driver circuits can form conduction delays of their sub-switches, so the MS and TS own a sufficient deadtime during the on-off process. Then the second delayed control signal realizes the control of the MS and TS in another Marx module, which finally meets the control requirements of the dual Marx-type pulse generator. Secondly, the selection of key components, such as MOSFET, fast recovery isolation diode, energy storage capacitor, and nanocrystal magnetic core, is provided, and related simulations are performed. The results show that the MS and TS have reliable deadtime when the sub-driver gate resistances are different. The overall simulation model achieves a bipolar pulse output of ±5 kV with flexible and adjustable pulse width polarity, verifying the feasibility of the circuit design. Finally, the prototype development is tested. The following conclusions can be drawn from the test: (1) The proposed magnetic isolated drive circuit is designed with magnetic core stacking, and inverse paralleled secondary side winding. It only needs two control signals to realize the control requirements of the bipolar pulse generator, which reduces the number of control signals and improves the system's reliability. Moreover, the synchronization of the switch triggering is unanimous. (2) The output voltage of the magnetic isolated drive-based dual-Marx generator is 0 to ±20 kV, the pulse width is 3 μs to 10 μs, the maximum output frequency is 200 Hz, and the interval between positive and negative polarity can be adjusted flexibly. (3) The module stacking and the energy storage capacitor adjustment can further expand the output capability of such generators.
董守龙, 周晓宇, 余亮, 刘鑫, 姚陈果. 基于磁隔离驱动的双极性Marx脉冲源研制[J]. 电工技术学报, 2023, 38(8): 2015-2024.
Dong Shoulong, Zhou Xiaoyu, Yu Liang, Liu Xin, Yao Chenguo. The Development of Bipolar Marx Pulse Generator Based on Magnetic Isolated Driver. Transactions of China Electrotechnical Society, 2023, 38(8): 2015-2024.
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2023, Vol. 38 
