多路隔离信号采集存储系统设计

Design of the Acquisition and Storage System for Multi-channel Isolated Signals

为采集飞行器落地瞬间两路隔离电压参数与一路PCM码流数据参数,采用"信号全隔离"思想,在电源隔离的同时使用光耦隔离芯片HCNR201对两路模拟电压速变量信号进行光耦隔离。系统采用Xilinx公司Vertex-II系列器件作为FPGA,以光继电器AQY210为选通开关,ADS8365作为模数转换器,经过FPGA混合编帧处理后将数据写入Flash中,存储数据完整可靠,模拟量波形稳定。实践证明,该系统可以成功隔离并采集到多路信号,满足设计需求。

To acquire two channels of isolated voltage parameters and one channel of PCM code stream data parameter at the landing moment of the aircrafts,the concept of＂signal full isolation＂is adopted. While in power supply isolation,the opto-coupling isolation chip HCNR201 is used to opto-coupling isolate two of the speed variable analog voltage signals. In the system,the device of Vertex-II family from Xilinx is used as the FPGA,the optical relay AQY210 is used as the strobe switch,and ADS8365 is used as A /D converter. After FPGA mixing framing processing,the data are written into Flash,the data saved are reliable and complete,and the analog waveform is stable. The practice proves that the system can successfully isolate and collect multiple channels of signals,so the demand for design is satisfied.