Sensing current on the high side

Sensing current on the high side

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Michael Dunn @ edn.com writes:

At their heart, the majority of DC current sense circuits start with a resistance in a supply line (though magnetic field sensing is a good alternative, especially in higher-current scenarios). One simply measures the voltage drop across the resistor and scales it as desired to read current (E = I × R (if I didn’t include this, someone would complain)). If the sense resistor is in the ground leg, then the solution is a simple op-amp circuit. Everything stays referenced to ground, and you only have to be careful about small voltage drops in the ground layout.

Sensing current on the high side – [Link]

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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1 Responses

  • Svenne
    11 December, 2016 at 11:24 pm

    Hello, Any hints for an application sensing current on the high side for a HiSide switch application like a proportional solenoid. How to deal with the reverse emf current when the switch goes on & off in 20Khz speed ??. There is a number of “Current Sense Amplifiers” ic for this problem but those are quite expensive. Like AD8211 from Analog Devices.

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