【摘要】 为了提高电致生物效应高压脉冲源连续运行时的输出精度及可靠性,设计了一种基于嵌入式实时操作系统Small RTOS51的电致生物效应高压脉冲源控制系统。采用NEC8254-2低成本地实现频率、占空比可调PWM输出,以MAX526,MAX197分别实现D/A,A/D功能,构成高压脉冲源输出控制与反馈回路,并提出了一种改进的采样信号中位值滤波算法。与传统中位值滤波算法相比,该算法具有更高灵敏度,基于RTOS的程序设计,提高了系统的可靠性。实验结果表明:高压脉冲源在连续运行条件下输出精度稳定达到0.1%。更多还原

【Abstract】 In order to improve the output accuracy and reliability of bioelectrical effect high pulse generator running continuously,a bioelectrical effect high voltage pulse generator control system based on embedded real time operating system Small RTOS51 was designed.It used NEC8254-2 to realize adjustable PWM output of frequency and duty cycle,applied MAX526 and MAX197 to achieve D/A and A/D function,composing the high voltage pulse generator output control and feedback loop,and presented an improved sampling signal median filter algorithm.Compared to traditional algorithm,this algorithm has higher sensibility,based on RTOS programmer,it improves the reliability of system.Experimental results show that the output accuracy of high voltage pulse generator is up to 0.1%.更多还原