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为了提高微细电火花加工的脉冲利用率 ,控制系统要求能对一段时间内的放电状态进行连续采集。通过对待测信号的调理 ,使采集系统的任务降到只需以微细电火花脉冲电源的脉冲速率进行采样即可 ,即速率要求为 2 MHz。然而市场上的板极采集元件不是达不到速度要求 ,就是速度太高 ,功能冗余 ,价格昂贵。为此 ,笔者采用了 DMA技术 ,配合高速 A/ D转换器 ADC- 2 0 8MC的应用 ,设计了一个适用于极间放电状态检测的高速采集系统。文中对该系统的一般情况进行了简要介绍 ,着重对 DMA技术与 A/ D转换器的应用及其相关硬件电路进行了分析和讨论 ,并给出了软件实现的说明。
In order to improve the pulse EDM pulse utilization, the control system requirements for a period of time for the continuous discharge of the state collection. By conditioning the signal under test, the task of the acquisition system is reduced to sampling only at the pulse rate of a micro-spark pulse power supply, ie, a rate of 2 MHz is required. However, the market is not the plate collection of components not meet the speed requirements, that is, the speed is too high, functional redundancy, expensive. To this end, I used the DMA technology, with the application of high-speed A / D converter ADC-208MC, designed a suitable high-speed acquisition system for the detection of discharge between electrodes. This paper introduces the general situation of this system briefly, and emphatically analyzes and discusses the application of DMA technology and A / D converter and its related hardware circuits, and gives the explanation of software implementation.