用于无损离子操纵结构的双极性射频电源的研制

Development of a Bipolar Radio-Frequency Power Supply for Structures for Lossless Ion Manipulations

  • 摘要: 无损离子操纵结构(structures for lossless ion manipulations,SLIM)是一种在特殊背景气体下,利用静电场、射频电场、离子驱动电场共同作用实现对气相离子无损传输的新结构,在物质传输和分离方面有着广阔的应用前景。为了充分发挥SLIM在体积和成本上的优势,本研究研制了一款体积小、结构紧凑、成本经济的高频高压双极性射频(radio frequency,RF)电源。该电源使用隔离模块实现控制电路与功率电路的电气隔离,并采用以GaN金属-氧化物-半导体场效应管(MOSFET)为核心的半桥电路作为输出级。针对SLIM的容性负载特性,利用电阻-电感-电容(RLC)电路的滤波特性,实现双极性正弦脉冲电压的输出。经测试,该电源可输出频率1 MHz、峰-峰值 420 V(±210 V)的双极性正弦射频高压信号。在实验室自建的基于行波(traveling wave,TW)的无损离子操纵结构(TW-SLIM)迁移谱实验平台上,以甲基膦酸二甲酯(DMMP)为样本,深入探究了射频电源幅值及频率对小分子离子传输效率的影响。结果表明,射频电源幅值及频率均会对TW-SLIM结构的离子传输效率产生影响,并存在1个最优值范围,这与COMSOL的仿真结果相吻合。该射频电源能够有效支持TW-SLIM平台的稳定运行,对推动基于SLIM的小分子迁移谱技术的小型化和便携化研发具有重要价值。

     

    Abstract: Structures for lossless ion manipulations (SLIM) is a new structure to realize the lossless transmission of gas phase ions by using the combination of electrostatic fields, radio frequency electric fields and ion driving electric fields under special background gas. Its potential applications in material transport and separation are numerous. In order to take full advantages of lossless ion manipulation structures in terms of cost and volume, a low-cost, high-frequency, bipolar radio frequency (RF) power supply with low complexity and compact design was developed in this study. The power supply employed an isolation module to provide electrical isolation between the control and power circuits. In addition, the output stage used a half-bridge circuit with GaN metal-oxide-semiconductor field-effect transistors (MOSFETs) as the core devices. Given the capacitive load characteristics of SLIM, the filter characteristics of a resistor-inductor-capacitor (RLC) circuit were utilized to output bipolar sinusoidal pulse voltages. Through experimental testing, the power supply was able to provide a 420 V (±210 V) peak-to-peak sinusoidal RF high-voltage signal at 1 MHz. On a lab-built instrument platform based on traveling wave-based structures for lossless ion manipulations (TW-SLIM), the influence of the RF voltage amplitude and frequency on the transport efficiency of small molecule ions was investigated using dimethyl methylphosphonate (DMMP) as an analyte. The results showed that both the amplitude and frequency of the radio frequency power supply can affect the ion transport efficiency of the TW-SLIM structure, and there is an ideal range. These findings align with the outcomes of COMSOL simulations. This RF power supply can support the TW-SLIM platform in an efficient manner and is highly valuable for developing compact portable research equipment based on SLIM.

     

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