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针对以前研究中高场非对称波形电源不足的问题,提出了一种用于FAIMS系统的高场高频非对称波形电源的设计。该电路由方波产生电路、高通滤波器和直流叠加电路3部分组成。方波产生电路采用半桥结构,通过2个MOSFET管的串联,实现了高压方波的输出。利用高通滤波器去除了高频方波中的直流分量,使正方波变成正负面积相等的非对称方波,并进行了理论分析。直流叠加电路通过电阻和电感串联将低压直流信号叠加到高频高压的非对称方波上,同时有效阻隔了高频高压非对称方波对低压直流电源可能造成的损害。还给出了电路的结构,并进行了实验研究。实验结果表明,该电路可以很好地实现非对称方波的自动产生和补偿电压叠加功能,且结构简单。该电路能够输出的最大峰峰值电压为2000V,方波频率为200kHz。
Aiming at the problem of power shortage of high field asymmetric waveform in previous research, a design of high field and high frequency asymmetrical waveform power supply for FAIMS system is proposed. The circuit consists of square wave generating circuit, high-pass filter and DC superposition circuit 3 parts. Square wave generating circuit using half-bridge structure, through the 2 MOSFETs in series to achieve a high-voltage square wave output. The use of high-pass filter to remove the high-frequency square wave DC component, the square wave into an equal area of positive and negative square wave asymmetric, and a theoretical analysis. The DC superposition circuit superposes the low-voltage DC signal to the high-frequency and high-voltage asymmetrical square wave through the series connection of resistance and inductance, and effectively blocks the possible damage to the low-voltage DC power supply caused by the high-frequency and high-voltage asymmetrical square wave. Also given the circuit structure, and conducted an experimental study. Experimental results show that this circuit can realize the automatic generation of asymmetrical square wave and compensate the voltage superimposition function, and the structure is simple. The circuit can output the maximum peak-to-peak voltage of 2000V and the square wave frequency of 200kHz.