基于DSP的脉冲电源系统触发时序控制与优化

Control and optimization of trigger timing of pulse power supply system based on DSP

为了满足大电流直线驱动技术中对脉冲电源系统按照设定时序触发各电源模块的需求,本文基于数字信号处理器TMS320C2812设计了一套控制系统。该控制系统能够在强磁环境下对脉冲电源系统进行稳定精确的时序触发,采用优化时序触发从而获得峰值波动较小的脉冲波形。开发了包含时序优化算法的上位机控制系统,编程控制DSP内部定时器产生30路脉冲信号,设计了可靠性高、延时小的通信电路和电源模块驱动电路。最后,将该控制系统用于大电流直线驱动装置的实验,实验所用的脉冲电源由30个电源模块组成,最高储能270kJ。分析实验测得的电流波形,实际放电的时序与在控制系统中的设定时序相比,误差分布在10~18μs之间,表明该系统可以在大电流强磁场干扰下对脉冲电源系统实现精确可靠的时序触发控制;对比优化时序、经验时序和同步触发得到的脉冲电流波形,优化时序得到的电流脉宽最大、电流峰值波动最小,表明该控制系统具有简化操作、优化电流波形避免峰值电流过高的优势。

In high current linear drive technology,there are requirements of triggering the power modules in pulse power supply system according to the set timing. This paper designed a control system based on digital signal processor( DSP) TMS320 C2812. The control system can trigger the pulse power supply system under strong magnetic environment stably and accurately with the set timing,and optimize the trigger timing to obtain a pulse current waveform with small fluctuation in flat top stage. Firstly,an upper computer control system including the trigger timing optimization algorithm is developed. Secondly,the DSP internal timer is programmed to generate 30 pulse signals. Thirdly,a communication circuit with high reliability and low delay and a power module drive circuit are designed. Finally,the control system is applied to the experiments of high current linear drive. The pulse power supply system used in the experiments consists of 30 power modules with a maximum energy storage of 270 kJ. Comparing the actual discharging timing and the set timing,the error of the control system triggering the power modules is found between 10 ~ 18μs,which indicates that the system can realize the reliable and accurate trigger under the interference of high current and strong magnetic field. Comparing the pulse current waveform obtained by optimized trigger timing,empirical trigger timing and synchronous triggering,it is found that the first one has largest pulse width and minimal fluctuation. The experiment result indicates that the control system has the advantage of simplified operation,optimizing the current waveform and avoiding the risk of excessive current peak.