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    • 24. 发明申请
    • ANALOG INPUT DEVICE
    • 模拟输入设备
    • US20090257260A1
    • 2009-10-15
    • US12438366
    • 2006-12-14
    • Yoshihiro AkeboshiSeiichi SaitoTetsuya Nagakawa
    • Yoshihiro AkeboshiSeiichi SaitoTetsuya Nagakawa
    • H02M7/06
    • G01K7/026G01D3/08G01R31/026H03M1/0827H03M1/1076H03M1/1225
    • An analog input device according to the present invention includes a scanning circuit (3) including a first insulation transformer (T1) for insulating an analog signal inputted from a thermocouple (10), a power supply section (2) for charging a test voltage used for disconnection detection of the thermocouple (10), a second insulation transformer (T2) in which the scanning circuit (3) and the power supply section (2) are connected in parallel, and a control circuit (8) for outputting a pulse signal to be inputted to the second insulation transformer (T2). In the analog input device, the second insulation transformer (T2) insulates and transfers a drive pulse (41) for switching the scanning circuit (3) and a power supply pulse (42) for feeding power to the power supply section (2). The control circuit (8) carries out a timing control so that the drive pulse (41) and the power supply pulse (42) are not outputted at the same time. Accordingly, an insulation transformer for application of a test voltage is not required, and thus the total number of the components is reduced to a great extent and reductions in costs and size thereof are realized.
    • 根据本发明的模拟输入装置包括:扫描电路(3),包括用于绝缘从热电偶(10)输入的模拟信号的第一绝缘变压器(T1);用于对所使用的测试电压进行充电的电源部分(2) 对于热电偶(10)的断开检测,并联连接有扫描电路(3)和电源部(2)的第二绝缘变压器(T2)和用于输出脉冲信号的控制电路(8) 被输入到第二绝缘变压器(T2)。 在模拟输入装置中,第二绝缘变压器(T2)绝缘并传送用于切换扫描电路(3)的驱动脉冲(41)和用于向电源部分(2)供电的电源脉冲(42)。 控制电路(8)执行定时控制,使得驱动脉冲(41)和电源脉冲(42)不被同时输出。 因此,不需要用于施加测试电压的绝缘变压器,从而在很大程度上降低了组件的总数,并且实现了成本和尺寸的降低。