[1]李大伟,吴燕娟,盛成龙,等.开关量检测系统自诊断技术与实现方法研究[J].工业仪表与自动化装置,2018,(02):33-39.[doi:1000-0682（2018）02-0000-00]
　LI Dawei,WU Yanjuan,SHENG Chenglong,et al.Research on self-diagnosis technology and implementation method of the switching quantity detecting system[J].Industrial Instrumentation & Automation,2018,(02):33-39.[doi:1000-0682（2018）02-0000-00]
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开关量检测系统自诊断技术与实现方法研究

《工业仪表与自动化装置》[ISSN:1000-0682/CN:61-1121/TH]

Title:: Research on self-diagnosis technology and implementation method of the switching quantity detecting system

Author(s):: LI Dawei; WU Yanjuan; SHENG Chenglong; DOU Weiming; DING Yuanming; XIANG Yong; Goldcard Smart Group ,Co.,Ltd., Hangzhou 310018 China

Keywords:: self diagnosis; switch quantity; signal detection; anti break line; low power consumption

摘要:: 开关量检测技术具有简单、可靠、成本低等优点，被广泛应用于智能仪表进行信息传递。但其接口电路在短路或开路时，会出现功耗变大及检测功能失效的问题。该文针对上述问题，提出了一种带有自诊断功能开关量检测系统方案，实现了对接口状态的检测和诊断，进一步提高了仪表的智能化程度。当系统发生故障时，功耗也不会增大，并可以诊断出故障原因。该设计还结合实践，搭建了测试环境并进行测试验证。结果表明：当外部接口短路时，平均电流为0.48 μA；当外部接口正常时，采样电压为1.54 V；当外部接口开路时，采样电压为2.55 V；当内部接口开路或短路时，可自检出开关量信号无变化，同时，自动切断系统供电电源，保护其他模块功能不受影响。

Abstract:: Because of the advantages of simple, reliable and low cost, the switch quantity detection technology is widely used in intelligent instruments to carry out information transmission.?However, when the interface circuit is short circuited or opened, the power dissipation and the failure of the detection function will appear.?Aiming at the above problems, this paper proposes a scheme of switch detection system with self diagnosis function, which can detect and diagnose the interface state, and further improve the intelligence level of the instrument.?When the system fails, the power consumption will not increase, and the cause of the fault can be diagnosed.?This design also combines practical situation to build a test environment to test and verify.?The results show that when the external interface is short circuited, the average current is 0.48 μA. When the external interface is normal, the sampling voltage is 1.54 V. When the external interface is open, the sampling voltage is 2.55V. When the internal interface is open or short circuited, it can detect the switch signal without change.?At the same time, it can automatic cut off system power supply, and protect other module function not affected.

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更新日期/Last Update: 2018-04-15