CAJ | 학술논문

为开展空间力学实验,文中介绍了一种基于DSP变PID算法的空间温度控制系统,应用于空间液桥模型。该方案利用DSP TMS320F2812作为微处理器,前端利用热电偶采集温度信号,经调理电路、AD转换后通过AD转换器自带SPI接口输入到DSP。 DSP根据温度偏差值,运用PID算法控制PWM输出,PWM占空比直接决定驱动温度执行机构工作的桥电路功率,从而实现温度的闭环控制。实验结果证明,该系统稳定性能好、控制精度高,在液桥实验需求范围内控温精度能达到±0.03℃。
위개전공간역학실험,문중개소료일충기우DSP변PID산법적공간온도공제계통,응용우공간액교모형。해방안이용DSP TMS320F2812작위미처리기,전단이용열전우채집온도신호,경조리전로、AD전환후통과AD전환기자대SPI접구수입도DSP。 DSP근거온도편차치,운용PID산법공제PWM수출,PWM점공비직접결정구동온도집행궤구공작적교전로공솔,종이실현온도적폐배공제。실험결과증명,해계통은정성능호、공제정도고,재액교실험수구범위내공온정도능체도±0.03℃。
Describe a space temperature control system based on DSP for PID algorithm in order to carry out the experiment of spatial me-chanics,used in space liquid bridge experimental model. The program draws on TMS320F2812 as a microprocessor,the front-end uses thermocouple temperature for signal acquisition,after conditioning circuit,AD conversion input to the DSP by SPI. According to the tem-perature deviation,DSP uses PID algorithm to control PWM,and the PWM duty cycle directly determines the circuit power of bridge driver for the temperature actuator,in order to achieve closed-loop temperature control. Experimental results show that the system is sta-ble,with high control precision,the temperature control precision can reach ±0. 03 °C within the scope of the demand for liquid bridge experiment.