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High-five to high-side current sensing

机译:高五到高端电流检测

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摘要

For over a century the standard method of measuring amperage has used a current-shunt ammeter in series between the load and power source. The shunt, basically a resistor with very low resistance, bypasses the majority of load current around the measuring instrument. Only a proportional fraction of overall load current actually passes through the meter. The technique was called high-side current sensing. However, high-side shunts require isolation in modern electronic control systems because of their direct connection to the high-side voltage rail. Current transformers perform this service in ac power systems. But the size and cost of isolated high-side dc sensing precluded its use in many applications.
机译:一个多世纪以来,测量安培数的标准方法是在负载和电源之间串联一个分流电流表。分流器基本上是一个电阻很低的电阻,可绕过测量仪器周围的大部分负载电流。实际上,只有总负载电流的比例部分流过电表。该技术称为高端电流感测。但是,在现代电子控制系统中,高端旁路需要直接隔离,因为它们直接连接到高端电压轨。电流互感器在交流电源系统中执行此服务。但是,隔离式高端直流检测的尺寸和成本使其无法用于许多应用。

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