A Generator of Rectangular Pulses Based on a Serial Connection of Mosfet with Umax = 4500 V

IF 0.4 4区工程技术 Q4 ENGINEERING, MULTIDISCIPLINARY Instruments and Experimental Techniques Pub Date : 2024-06-28 DOI:10.1134/s0020441224700131

A. L. Despotuli, V. V. Kazmiruk, A. A. Despotuli, A. V. Andreeva

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Abstract

The purpose of the article is to show the advantages of a new design of a high-voltage rectangular pulse generator. Known analogues combine modules: signal generator; high-voltage key of N identical transistors (Q_k, k = 1….N) connected in series; gate driver of leading Q_k; high-voltage power source, its electromotive force, emf (E), feeds all Q_k and load (R) of the key. In analogs, divider resistors (r_k) and snubbers balance equality of voltages U_k on all Q_k. Under nonideal balance conditions E ≈ 0.7NU_max, where U_max is the maximum operating voltage of Q_k. The new solution differs in that the high-voltage power source sets not one but N emf E_k (E_i/E_j = const (i, j); i ≠ j; i, j = 1, 2, …, N) and each E_k feeds its Q_k through the load R_k. Experiments and simulations have revealed advantages of the new design: (1) the simplicity of the circuit and key tuning, (2) the fast transition ON→OFF for all Q_k (as R_k is small, R_k \( \ll \) r_k), (3) the high pulse repetition rate, and (4) the greatly improved balancing of U_k voltages allows the E_k emf to be set so that ΣU_k ≈ ΣU_{k, max} at U_i, max ≠ U_k, max. The generator with the key based on two different MOSFETs (IXTL2N450 and IXTT1N450HV, U_max = 4500 V) and with a source where the E₂ = 2E₁ were used to excite vacuum ion emission from liquid Ga-based alloys.

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基于摩斯菲特串行连接的矩形脉冲发生器，Umax = 4500 V

摘要本文旨在说明高压矩形脉冲发生器新设计的优点。已知的模拟装置由以下模块组成：信号发生器；由 N 个相同晶体管 (Qk, k = 1....N) 串联而成的高压键；前导 Qk 的栅极驱动器；高压电源，其电动势 emf (E) 供给所有 Qk 和键的负载 (R)。在模拟电路中，分压器电阻器 (rk) 和缓冲器可平衡所有 Qk 上的电压。在非理想平衡条件下，E ≈ 0.7NUmax，其中 Umax 是 Qk 的最大工作电压。新方案的不同之处在于，高压电源设置的不是一个，而是 N 个 emf Ek（Ei/Ej = const (i, j); i ≠ j; i, j = 1, 2, ..., N），每个 Ek 都通过负载 Rk 为其 Qk 供电。实验和模拟揭示了新设计的优势：(1) 电路和按键调整简单；(2) 对所有 Qk 都能快速实现 ON→OFF 转换（由于 Rk 很小，Rk （ \ll \）rk）；(3) 脉冲重复率高；(4) 大大提高了 Uk 电压的平衡性，使 Ek emf 可以在 Ui, max ≠ Uk, max 时设置为 ΣUk ≈ ΣUk, max。基于两个不同 MOSFET（IXTL2N450 和 IXTT1N450HV，Umax = 4500 V）的键发生器和 E2 = 2E1 的源被用于激发液态镓基合金的真空离子发射。

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来源期刊

Instruments and Experimental Techniques 工程技术-工程：综合

CiteScore

1.20

自引率

33.30%

发文量

113

审稿时长

4-8 weeks

期刊介绍： Instruments and Experimental Techniques is an international peer reviewed journal that publishes reviews describing advanced methods for physical measurements and techniques and original articles that present techniques for physical measurements, principles of operation, design, methods of application, and analysis of the operation of physical instruments used in all fields of experimental physics and when conducting measurements using physical methods and instruments in astronomy, natural sciences, chemistry, biology, medicine, and ecology.