【作者】 王忠福；

【导师】 陈昌；

【作者基本信息】 大连理工大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 随着我国基础建设投资的增大和发展,基建施工对工期和质量的要求越来越高。混凝土在基建施工的需求量很大,其质量直接影响着基建的质量。采用混凝土生产设备-自动控制的搅拌站就可以保证混凝土的质量,提高混凝土生产效率。混凝土的整个生产工艺过程中,配料最为重要,称重变送器模块是混凝土生产工艺配料中核心模块之一,本论文目的就是设计一款高精度称重变送器。 本设计有以下的特点: (1)采用Cirrus Logic公司的24位△-∑型CS5532转换器。该转换器采用电荷平衡技术和极低噪声可编程增益斩波稳定测量放大器,能够达到24位分辨率输出结果。宽的动态特性、可编程输出速率、灵活的供电方式以及简便的三线串行输出方式使CS5532成为称重变送器的理想设计方案。此外,CS5532内部有一个完整的自校正系统,可进行自校准和系统校准,可消除A/D本身零点增益和漂移误差,以及系统通道的失调和增益误差。 (2)利用AD623和数字电位器X9C103实现可编程增益放大器。称重变送器处理的信号量程范围为0-36mV,并且要求介于其间的量程变化几乎是无级的,所以选用可通过外接电阻的控制来实现增益变化的放大器AD623,配合数字电位器X9C103实现无级的需求。 (3)介绍了一种新的称重变送器系统漂移校正算法。称重变送器漂移包括零点漂移和增益漂移,实验表明本漂移校正算法能够很好的解决称重变送器的漂移问题。 针对本设计进行模拟实验,由结果数据可以看出,本设计已经达到了预期的设计目标,是一款有效的、经济的设计方案。更多还原

【Abstract】 With the aggrandizement and development of the infrastructure, it is more and more high with the request of the quantity. Its quantity affects the infrastructure quantity directly. Using the concrete production equipment-automation control agitation station can guarantee the quantity of the concrete and raise the concrete production efficiency. Weight transmitter is a core module in the concrete of whole produce craft process. Highly precise weight transmitter is purpose of this thesis.The characteristics in this paper as follows:(l)The design is based on 24-Bit A/D Converter CS5532 of Cirrus Logic.The highly integrated △- ∑ Analog-to-Digital Converter uses charge-balance techniques to achieve 24-bit performance. High dynamoic range programmable output rates flexible power supply options and simple three-wire serial interface makes the ADC ideal solutions for weigh scale. CS5532 offer both self calibration and system calibration. The calibration can eliminate A/D zero error system channel error and drift error.(2) The hardware circuits with AD623 and potentiometer X9C103 develop programmable gain amplifier. Maxmal singnal range of weight transmitter input is 0 to 36mV.The AD623’s gain is resistor programmed by X9C103, or more precisely whatever impedance appears between Pins 1 and 8.(3) A new drift correction algorithm of weight transmitter system is introduced. The drift of weight transmitter includes zero drift and gain drift. Drift correction algorithm perfectly resolves the drift problem practicely.Simulation experiments have been made. The results show that the performance of drift correction algorithm given in this paper is satisfying. The design is relatively high valuable in practice. It is proved to be relatively high effective.更多还原