Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [current-sensing]

168 questions
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High-side current sensing diagram

I have a load that can be connected or disconnected from a +5V source (let's assume there is a switch). My target is to trigger an output to high-level voltage if the load is connected, and trigger it to low-level if it's disconnected. So far, the…
Alreiber
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Unexpected output with INA138 current sensor

I have no experience with current sensing ICs and I'm trying to build a current sensor with an INA138 IC that I've imported into LTspice. From the manufacturer's website, I'm expecting my output to correspond to: $$V_o=I_sR_sR_L/5k\Omega$$ With an…
p.chives
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Current Sense circuit with digitally programmable gain

I'm designing a precision source meter and I wanted to put a couple ideas out to the community. One thing I will note is that this device has 32 channels, so I need to be very cognizant about both component cost, and component size. Current sense…
AMacDonald
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Current-sense resistor switching mechanism

I planned to make a DIY power meter with automatic switch for current range, usually towards low (uA maybe) currents. I came up with the design below to switch between various current-sense resistors. The MOSFETs will be chosen to have very low Rds…
Tirdad Sadri Nejad
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Some questions regarding measuring current using ACS712

I'm using an ACS712 0-5A current sensor to measure the input current to a boost converter for the implementation of MPPT algorithm. To do so, I need to connect the ACS712 chip in series with a PV voltage source. There are two questions I have…
Narutorunner11
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Designing a high-side current sensor

I'm trying to design a high-side current sensor for limiting the current in a circuit I'm building however I'm very inexperienced with the operation of high-side current sensors. This is my circuit: I'm trying to use the current sensor with a…
p.chives
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How to sense current AC of a sinusoide -100mA to 100mA with 70kHz

Any suggestions about a chip or PCB component that could work? I tried to use the the current sense transformer PA1005.050NLT https://www.digikey.com/product-detail/en/pulse-electronics-power/PA1005.050NLT/553-1527-1-ND/2362933 to sense a small…
algior
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"ground disturbance" in current sensing with shunt resistor

There are lots of questions about "traditional" low-side current sensing using a shunt resistor. Most discussions and papers mention the drawback of "ground disturbance" introduced by the measurement principle (dropping voltage across the sense…
Junius
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