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Single channel temp. measurement and communication circuit - has differential amplifier and frequency converter to eliminate transducer oscillator accuracy effect

机译：单通道温度测量和通信电路-具有差分放大器和变频器，以消除传感器振荡器的精度影响

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摘要

The circuit contains a measurement resistance (3) in a four-wire circuit with a short-circuit switch between its voltage tappings. A differential amplifier (2) and a voltage-to-frequency converter (1) with charge quantity compensation are provided, a sample-and-hold element (16), frequency dividers (10,11)m(10,11), an output stage (14) and other logic elements. The output of the voltage-to-frequency converter is connected via an AND circuit (12) to an output stage (9) pref. contg. an optical transmitter. The further inputs of the AND circuit are connected via the frequency dividers and a delay gate to the internal oscillator of the transducer. The frequency divider is designed to produce a definite duty cycle. USE/ADVANTAGE - For use in process automation applications. The circuit design ensures that the accuracies of the current supply and oscillator have no influence on the number of pulses transmitted.

机译：该电路在四线制电路中包含一个测量电阻（3），在其电压抽头之间具有短路开关。提供了具有电荷量补偿的差动放大器（2）和电压-频率转换器（1），采样保持元件（16），分频器（10,11）m（10,11），输出级（14）和其他逻辑元件。电压-频率转换器的输出通过与电路（12）连接到输出级（9）pref。续光发射机。 AND电路的其他输入通过分频器和延迟门连接到换能器的内部振荡器。分频器设计用于产生确定的占空比。使用/优势-用于过程自动化应用程序。电路设计可确保电流源和振荡器的精度不影响所传输的脉冲数。

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公开/公告号DE3915835A1

专利类型
公开/公告日1990-03-01

原文格式PDF
申请/专利权人 VEB KOMBINAT NAGEMA DDR 8045 DRESDEN DD;
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申请/专利号DE19893915835
发明设计人 KLICKERMANN THOMAS DR.-ING. DDR 6300 ILMENAU DD;KRAUSE LUTZ DR.-ING. DDR 6300 ILENAU DD;RANFT GEORG DIPL.-ING. DDR 6327 ILMENAU DD;
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申请日1989-05-16
分类号G01K7/16;
国家 DE
入库时间 2022-08-22 06:10:07

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