基于TMS320F2812 FAIMS仪用RF电源控制系统

Design of RF Power Supply Control System Based on TMS320F2812 for FAIMS Instrument

文中提出一个FAIMS仪用高场非对称方波RF电源系统设计方案,系统由信号发生器、高速开关、高压直流电源、高通滤波、补偿电压自动扫描及采集、和计算机控制六部分组成。以TMS320F2812为信号发生及控制核心,驱动高速开关通过逆变产生方波RF信号同时控制DAC转换实现补偿电压自动扫描。该电源系统可以输出频率≤2MHz,电压幅值≤2kV,功率≤300W,占空比20%～50%,波形上升时间约15ns的非对称方波波形。

A high-field high-frequency rectangular waveform RF power supply for FAIMS （field asymmetric waveform ion mobility spectrometry）system is developed in this paper. The system consists of six parts, which are signal generator, high-speed switch, high-voltage DC power supply, high-pass filter, the compensation voltage auto-sweeping and collection and computer control circuit. TMS320F2812 generaled and controlled the signals, which drivered the highspeed switch to general the rectangular RF waveform by inverter. The power system could general rectangular asymmetric waveform, limited to frequencies of ≤2MHz, voltage pulse amplitudes of ≤2kV, power of ≤300W and the duty cycle of 20%-50% with waveform steep rise times of the order of -15ns. The toluene sample was adopted to characterize the FAIMS system. When the power system was applied to the FAIMS system, the spectra of toluene were obtained, it shows that the ions can be separated and detected by the FAIMS system.