Questions tagged [current-sensing]
The current-sensing tag has no usage guidance.
180 questions
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Real Time AC Current Sensing [closed]
I'm trying to analyse the harmonics present in different household devices's current waveforms. For this, I need a CT based current sensor which can sample data quite accurately and quickly (around 5% ...
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Current sense amplifier working principle
i am running a bldc motor Infineon TLE9879 chip. Now i want to measure the current flowing through the motor. so i use the current sense amplifier where the motor current is converted to a voltage by ...
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Sensing Mobile Battery full and cutting down power on V_bus line
I just come across the situation to cutoff the power when mobile battery full is detected (by breaking the +5v line) .I planned to implement this using high side current sensing method.When the ...
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Closed loop control of PWM using current sensing method
This is the block diagram of the project i am working on. I have a DC voltage range of input as 8V to 16V.
The duty cycle at the PWM generation should change automatically from 10% to 90%. I require ...
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High-side current sensing with a rail-bound instrumentation amplifier?
I know that current shunt monitor ICs and high common-mode voltage differential amplifiers like the INA117 and AD629 exist but I'd like to know if it's possible to use a regular instrumentation ...
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Wide range current sensing at +5kVDC
I am working on a control and interface board for high voltage supplies, which requires some current measurement to be implemented. The general terms of the question are similar to this one. The ...
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Precision of estimating power consumption with a current sensor
When estimating power consumption with a current sensor, what is the usual precision that can be achieved for home appliances? I'd like to make a simple circuit using such a sensor and a ...
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AC Current Sensing Switch Using Current Transformer
I'm struggling to design a circuit that will interpret signals from a SCT013 current transformer and trigger a constant 5v signal (which will go to a microcontroller) when a certain current threshold ...
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Differential amplifier for current measurement
I'm studying reference design from TI (pdf).This design shows the solenoid control circuit. I was interested, why a differential amplifier is used to measure the current? Why not use non-inverting ...
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Current sensing application
The purpose of the application is to maintain a constant current at the load, even if the resistance changes.
I understand that the ADC is reporting the voltage and current values at the load to the ...
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Turn vacuum on when another load (eg. drill/saw/etc.) is active [duplicate]
I need to turn ON (and OFF if possible) a vacuum when another DIY tool, like a drill, is activated/deactivated.
The idea is: "I start working and the vacuum start sucking dust automatically. Then it ...
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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 ...
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High side, high voltage, micro ampere current sensing
I am working on a project in which I am required to sense current in micro ampere range from a 2 kV power supply. Here is a link of an article which I am referring.
https://www.analog.com/en/technical-...
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What are shunts, as related to their use in current sensing in microcontrollers?
Within the manual for the I/O module I'm using (a Loytec LIOB-153) there are wiring diagrams to aid in wiring up your sensors and other inputs/outputs. There are two wiring diagrams for the purpose of ...
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Spikes - DC Motor Current Sensing
I'm using a drv8838 to run a small dc motor (<1A). For current sensing I set up a INA199 (see layout). I'm also using a RC lowpass with a cut off frequency of around 70Hz to filter the shunt ...
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Common mode error formula from TI seems counter intuitive
I'm working on an application to measure current in a buck converter using a current sense amplifier. According to this video from Texas instriment, the equation for common mode error is same as eqn 1 ...
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Closed-loop Hall-effect sensor operation
I know that closed-loop Hall-effect sensors generate a current in the secondary winding to oppose the flux in the core such that the net flux will equal zero.
At this point the current in the primary ...
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Current sensing with Rdson?
I'm fooling around with a PMOS, a Fairchild FDD6637, and pondering whether it would be possible to use Rdson as a sort of shunt-resistance for measuring the voltage drop, to get the amount of current ...
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Inexpensive field deployable non-invasive current sensor [closed]
Is there an inexpensive way to MacGyver a non-invasive current sensor together in a field (yes, a literal field), assuming some prior planning?
The context here is an event similar to EMF Camp or OHM,...
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540
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AC current sensing using micro-controller and suitable circuit
I'm working on the project in which I need to measure AC current. The main problem I am facing is small current amplitude. I have to obtain the current waveform(I need complete waveform not just RMS ...
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What are the two components of this waveform generated by a MS-15 hall effect current sensor?
I am doing a lab write up for school in which we measured the output of a current sensor which was part of a power supply we are using with our ELVIS boards. Here is a schematic of the basic design ...
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Automatic ranging current sensing
I am trying to implement a current shunt sensing circuit. This should be automatic and currently i want it to measure uA to around 200mA, and Change to the mA range at around 200uA. This is to profile ...
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Measuring average current consumption in hardware
I'm working on a very low power budget, battery powered project. This project is allowed to draw 15uA (average) at 3v. The microcontroller we're using draws 4-10mA when active, and 2-3uA when asleep....
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Current sensing nA to mA
I need to sense the current of a target MCU through various periods of its on/sleep/off state and then need to send this data back to another interface MCU to read out the value. They will be both on ...
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Design of low current sensor from 50mA to 2A in a dc-dc buck converter
I would like to sense the current from a path where a current of 50mA to 2 A is flowing to the load. Can I use simple differential amp with gain across the Rsense =20mohm or is there any contemporary ...
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Current sensing relay
I have a 240v/30a table saw and want to automatically start my dust collector, 240v/20a by means of a current sensing switch and relay. I have a 30a double pole relay w/ 24v coil. A 24v transformer ...
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Unipolar Hall current sensor signal conditioning for 5v ADC
Need help. I need to convert signal (0v to 5v) from Hall-based unipolar current sensor measuring the power line from the 84v 4kW battery pack to 5v MCU based ADC converter. Although both – the sensor ...
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Transimpedance vs. Non-Inverting Amp for high sensitivity application
In simple analysis, these two circuits give the same result ... i.e. producing 1V output for a 10pA input. Is there any advantage of one over the other in practice?
I am measuring currents in the ...
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Op amp with transistor in feedback
I am currently looking for a high side current sense IC. I have noticed that most of them that are without galvanic separation, are using an op amp with bjt transistor like in bellow schematics:
The ...
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The benefit to make or use a surface mount 4-terminal current sensing resistor
I find some precision SMD resistors are 4-terminal, like vishay's CSM3637P. It's constructed as below:
It seems it only make a slot on each pad, then get two extra pad to do the voltage measurement.
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