Mind the gap [electric trains]

D. Fisher
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Abstract

Engineers working on electric trains have struggled with the problem of ensuring that the pantographs keep as much contact with the overhead line as possible without damaging it in one of the harshest environments for electronics known. One system has stepped into the breach. Experience of electronics on trains dictates that both input circuit protection and galvanic isolation are essential (RIA 13 & EN50155). PanChex and the original pantograph telemetry developed by BR Research had used voltage to frequency and voltage to frequency conversion to enable digital transmission of analogue signals over a fibre optic cable. Although this method is useful for simple systems, it suffers from thermal drift. A small change in gain inherently creates a large change in output offset voltage. It was decided from the outset of this project that a standard analogue-to digital converter (ADC) preceded by a high performance instrumentation amplifier would be used to digitise the analogue signals from the sensors.
小心空隙[电动火车]
电动列车的工程师们一直在努力解决一个问题,即在已知最恶劣的电子设备环境之一中,如何确保受电弓尽可能多地与架空线路保持接触,同时又不损坏架空线路。一个系统已经填补了这个缺口。列车上电子设备的经验表明,输入电路保护和电流隔离都是必不可少的(RIA 13和EN50155)。PanChex和最初由BR Research开发的受电弓遥测技术使用电压到频率和电压到频率的转换,通过光纤电缆实现模拟信号的数字传输。虽然这种方法对简单的系统很有用,但它存在热漂移的问题。增益的微小变化必然会造成输出偏置电压的巨大变化。从项目一开始就决定采用标准的模数转换器(ADC),再加上高性能仪表放大器,将传感器的模拟信号数字化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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