6DD1600-0AC0

【厦门莫格电气自动化有限公司】

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【：（同号）】

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6DD1600-0AC0

摘要：基于ARM9系列的S3C2410处理器，结合嵌入式linux操作系统，完成硬件驱动程序和模糊自整定PID控制算法的设计，实现全自动生化分析仪反应池温度的高精度控制。运行结果表明，所设计的控制系统具有响应快，稳定性、实时性好等优点。实现了一种应用于全自动生化分析仪的高精度温度控制系统。

1 引言
ARM9越来越广泛的应用于各种生物电子仪器中，全自动生化分析仪是一个典型的应用。生化分析仪检测分析过程中温度对检测结果具有很大的影响，被检样品和试剂只有在的温度下检测才能保证生化检验结果的可靠性。生化分析仪的温控系统往往具有非线性、时滞性等特点，应用常规PID控制达不到理想的效果。本系统以ARM9处理器作为控制系统核心，实现模糊自整定PID控制算法。经测试，该系统精度高，稳定性好，响应快，反应盘控温于现行的标准检测温度37℃，控温精度为土0.1℃，显示精度为±0．01℃，*临床使用要求。

2 系统总体设计及主要硬件实现

2.1 系统总体设计

系统结构如图1所示。系统主要由测温器件、ARM控制器及显示变送单元三部分组成。ARM控制器采用三星公司的S3C2410A。测温器件负责温度的采集，在本系统由DS1 8B20温度传感器构成。整个系统工作过程是先由键盘设定温度值，ARM 控制器控制温度传感器采集温度信号，经过模糊PID 控制模块运算，输出PwM 波控制功率驱动模块，实现对温度的加热和制冷控制，同时通过LCD显示温度。

2．2 控制器S3C2410

S3C2410A是由Samsung Electronics Co．，Ltd为手持设备设计的低功耗、高度集成的，基于ARM920T内核16／32RISC嵌入式处理器，运行频率可达203MHz， 独立的16k指令和16kB数据的缓存(Cache)，虚拟内存管理的MMU单元，LCD控制器(STN&TFT)，非线性(NAND)FLASH的引导单元系统管理器(包括片选逻辑控制和SDRAM控制器)，3通道的异步串口(UART)，输入输出端口，实时时钟单元(RTC)，带有触摸屏接口的8个通道10bitADC，IIC总线接口，IIS总线接口，USB的主机(host)元，USB的设备(Device)接口，2个通道的SPI接口和锁相环(PLL)时钟发生单元。
本系统设计采用32位RISC嵌入式处理器工作模式，采用NAND FLASH启动方式。NAND FLASH存储器扩展选择三星电子公司生产的K9F1208，单片容量为64MX 8bit(64M字节)，工作电压2．7～3．6V，8位数据宽度，带有硬件数据保护功能，支持上电自动引导功能。系统中SDRAM 选用HY57V561620T，单片存储容量为4组x4Mxl6位(32M字节)，工作电压为(3．3±0．3)V，16位数据宽度。根据系统需要和充分发挥32位CPU的数据处理能力，本系统选用两片HY57V561620T并联构建32位SDRAM存储器系统，共64MB的SDRAM空间，可满足嵌入式操作系统及各种相对复杂的功能运行要求。

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