CAJ | 학술논문

针对基于DSP的高功率TEA CO2激光器控制系统直接利用DSP F2812内置A/D转换器（ADC）进行模拟量采样时存在转换误差较大,且模拟量易受电磁干扰等问题,从硬件和软件两个角度提出了校正DSP2812内置ADC的方法。硬件上采用硬件模拟滤波和隔离等手段对输入的模拟量进行处理;软件校正则通过将两路给定的参考电压值送入DSPF2812内置A/D转换器的两个转换通道,计算出ADC的偏置误差和增益误差,以此误差对其它通道A/D转换器进行校正。最后,实验分析了参考电压和A/D采样时钟频率对A/D转换精度的影响。结果表明,提出的方法能有效地提高A/D转换器的精度,A/D转换误差达到±3 LSB,特别是在对腔压值精度要求很高的0～12 000 Pa区段,A/D转换精度达±1 LSB,可以保证TEA CO2激光器的可靠运行。
침대기우DSP적고공솔TEA CO2격광기공제계통직접이용DSP F2812내치A/D전환기（ADC）진행모의량채양시존재전환오차교대,차모의량역수전자간우등문제,종경건화연건량개각도제출료교정DSP2812내치ADC적방법。경건상채용경건모의려파화격리등수단대수입적모의량진행처리;연건교정칙통과장량로급정적삼고전압치송입DSPF2812내치A/D전환기적량개전환통도,계산출ADC적편치오차화증익오차,이차오차대기타통도A/D전환기진행교정。최후,실험분석료삼고전압화A/D채양시종빈솔대A/D전환정도적영향。결과표명,제출적방법능유효지제고A/D전환기적정도,A/D전환오차체도±3 LSB,특별시재대강압치정도요구흔고적0～12 000 Pa구단,A/D전환정도체±1 LSB,가이보증TEA CO2격광기적가고운행。
It shows larger conversion errors and stronger electromagnetic interference when the AD converter（ADC） built in DSPF2812 of the control system for a high-power TEA CO2 laser based on the DSP is used to acquire analog signals.To overcome the backcomings,a method to correct the ADC built in the DSPF2812 was proposed based on both the hardware and software.In hardware processing,the analog filtering and isolation module were adopted to process the input analog signals and the median average filtering method was used to eliminate the occasional glitch.With software correction,two given reference voltages were sent to the two channels of the A/D converter of the DSPF2812 to calculate the offset error and gain error,then it was used to correct other channels of the A/D converter.Furthermore,the impact of the reference voltage and A/D sample clock on the A/D conversion precision was analyzed by experiments.The experimental results show that the method can improve the precision of the A/D converter effectively.The A/D conversion error has been within 3 LSB,which can ensure the stability and reliability of data acquisition for the control system in high-power TEA CO2 lasers.