剩余电压测试方法及其自动测量仪器的关键技术研究

发布时间：2018-06-30 07:56

本文选题：剩余电压 + 峰值断电　；参考：《中南大学》2012年硕士论文

【摘要】：剩余电压是指用插头连接电源的设备在拔掉插头的瞬时,插头上各插脚之间的残余电压,或者是当断开电气设备电网供电的瞬间内部储能元件(如电容)上的残余电压。制定剩余电压、剩余能量的限值是为了保护患者、操作者或其他人员的人身安全,防止在断电瞬间触及带电部件而发生危险。故准确地检测医疗设备的剩余电压值具有十分重要的意义。本文通过对现有剩余电压的测试方法的研究,设计了一种新型剩余电压自动测试仪,该测试仪由单片机组成的控制与数据处理单元及峰值检测电路单元等组成。首先,给待测设备提供电源,峰值时刻检测电路准确找到电压峰值点,单片机发出信号控制继电器驱动电路断开电源,然后采用分压器将电源插头间的剩余电压进行分压采样,该采样电压输入到电压跟随器,电压跟随器输出的电压值经ADC后,输入到单片机数据处理单元进行数据处理、储存与显示,并在剩余电压超出标准时报警。本研究解决了剩余电压测量的一个关键技术问题,即通过设计个零点检测的关键电路与可调延时器的配合,能使设备在交流峰值处准确断电。该新型剩余电压测量装置,具有较好的重复性、稳定性,以克服现有剩余电压测试仪不能准确地在峰值处断电、测试重复性差、测试工作量大及不能显示放电曲线等缺陷。
[Abstract]:The residual voltage refers to the instantaneous voltage between the pins of the plug and the residual voltage of the internal energy storage elements (such as capacitors) when the power supply of the electrical equipment is disconnected by the device connected with the power supply by the plug at the moment of unplugging the plug and the residual voltage between the pins on the plug. The limits of residual voltage and residual energy are set to protect the personal safety of patients, operators or other personnel, and to prevent danger from touching live components at the moment of power failure. Therefore, it is very important to accurately detect the residual voltage of medical equipment. In this paper, a new type of residual voltage automatic testing instrument is designed through the research of the existing residual voltage test method. The instrument is composed of a single chip microcomputer control and data processing unit and a peak detection circuit unit. First of all, to provide power to the equipment to be tested, the peak time detection circuit accurately find the voltage peak point, the single chip microcomputer sends out the signal to control the relay drive circuit to disconnect the power supply, and then uses the voltage divider to sample the remaining voltage between the power plugs. The sampling voltage is input to the voltage follower. After the output voltage value of the voltage follower is passed through ADC, it is input to the data processing unit of the single chip microcomputer for data processing, storage and display, and alarm when the remaining voltage exceeds the standard. In this paper, a key problem of residual voltage measurement is solved, that is, by designing the key circuit of zero point detection and the cooperation of adjustable delay device, the equipment can be cut off accurately at the peak value of AC. The new residual voltage measuring device has good repeatability and stability, so as to overcome the shortcomings of the existing residual voltage measuring instrument, such as not being able to power off accurately at the peak value, poor repeatability, large test workload and the inability to display the discharge curve.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.6

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