多路磁隔离栅-栅驱动的紧凑型全固态Marx发生器研制OA

Pulsed electric fields have been proven effective for potable water disinfection by inactivating pathogenic bacteria through pulsed corona discharge,which disrupts microbial cell membranes.However,conventional pulse generators suffer from limited tunability,large volume,and heavy weight,which restrict treatment efficiency.In contrast,solid-state Marx generators based on semiconductor switches can deliver multi-parameter-adjustable high-voltage pulses within a much smaller footprint,aligning well with the miniaturization and portability trends of pulsed-power supplies.Most magnetically isolated gate drivers utilize series-connected magnetic cores with a single winding per switch,resulting in one driver per switch.This paper proposes a novel multi-channel magnetic-isolation gate-to-gate driving scheme for compact all-solid-state Marx generators.The proposed architecture substantially reduces the number of drive circuits and enables a single bipolar signal to control all switches within a half-bridge solid-state Marx generator. Firstly,this paper introduces the improved magnetic-isolation drive scheme and its working principle.The common-source characteristic of the charging and discharging switches in the Marx structure is analyzed.Combined with the structure of a multi-secondary-winding transformer,a multi-route drive is realized under a single magnetic core.Meanwhile,the working principle of the gate-gate drive circuit is elaborated,and the influence of parasitic parameters on the switching characteristics of MOSFETs under the common-source structure is analyzed. Secondly,the magnetic isolation transformer and high-voltage insulation of the gate drive are designed.The magnetic core material,coupling capacitance,and high-voltage insulation are analyzed.Compared with the commonly used ferrite magnetic cores,iron-based nanocrystalline magnetic cores offer high magnetic saturation,low coercivity,fast pulse response,and high permeability.Subsequently,the coupling capacitance is measured under various parameters,including the number of secondary windings and magnetic core size,and the impact of different parameters on coupling capacitance is analyzed.In addition,this paper proposes a simple and effective high-voltage isolation scheme according to the proposed compact drive design. Finally,a 29-stage prototype was fabricated and tested.It produces up to 20 kV with the rise and falling times below 65 ns(1 kΩ load),offers pulse-width adjustment from 0.2 μs to 200 μs,and operates stably at 5 kHz.With a volume of only 185 mm×96 mm×115 mm,the generator achieves a power density of 473 kW/L.The compact solid-state Marx generator meets the requirements for potable-water sterilization,enhancing output performance while markedly reducing size and weight for portable and distributed applications.