Questions tagged [current-sensing]
The current-sensing tag has no usage guidance.
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22 views
Buck converter design using MCP1630V
I have already designed a buck converter with the following specifications using an MCP19035:
Vin=14V,
Vout=1.8V,
Fc=63kHz(Crossover frequency),
Vref=0.6V,
Iout=10A
step load High IOH=7.5A
step ...
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0answers
21 views
Using a switching DC-DC converter in high dynamic range current/voltage sensing
I'm thinking of making a power meter circuit which will have a high-side current-sensing amp (LTC6102), a resistive voltage divider for sensing the voltage, a dual op-amp (OPA2365) as a buffer for the ...
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0answers
40 views
H-Bridge Low Side Sense Resistor - Position of Resistor and Bulk Capacitance
My question regards the considerations required in determining the location of a current sense resistor on the low-side of an H-Bridge. I've presented two scenarios.
Details: The H-Bridge load is a ...
1
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1answer
401 views
ESP32 using acs712 give wrong values
I'm trying to measure current with acs712 30A current sensor connecting to NodeMCU-32S but I'm getting wrong and unstable values. For zero current the ADC pin should read value of 2048 (esp has 12 bit ...
-2
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1answer
68 views
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0answers
29 views
Stepper Motor Driver UC3770A
I have a bunch of UC3770A IC's (datasheet) from my school, and I would like to use them to drive the stepper motors in a project I am working on. I have tried to put the circuit together a couple of ...
0
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1answer
95 views
FOC sensor vs sensorless
I am trying to understand the hardware difference between the sensored and sensorless FOC 3-phase Induction Motor Drive circuit.
So far what I understand is that FOC require following sensors:
1. ...
0
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1answer
69 views
SMPS Current Sense Resistor Selection
I am looking into using an SPV1040 boost converter to charge a battery from a solar cell. The chip includes inputs for a current sense resistor, which are described in one of ST's applications notes ...
2
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1answer
160 views
Shunt resistors and PCB layout
I have several questions about the current sensing through a resistance.
The resistances are 2-SMD package and I will use the 4-wire kelvin method for the layout.(see image) Specifically, there are ...
-1
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1answer
121 views
Current sensing for side channel analysis
I'm trying to design a power supply with a built in current sensor for a digital system. The purpose is for side channel analysis. In current sensing, I would like to detect both the AC and DC current....
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2answers
50 views
Over-current sense
I am using a circuit shown below.
it is designed to sense 1.5 A whenever the load takes current >= 1.5 A. Rsen senses the related voltage and activates the transistor.
Here I use a Rsen = 0.46 R(0.7V/...
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2answers
105 views
Four-terminal resistor pinout?
Anyone can tell me (or preferably, point me to a source that explicitly shows) the pinout of the 4-pin current-sense resistors?
I'm seeing the datasheets for three different models (including Rideon'...
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3answers
126 views
Current sensing on negative 1.1kV DC rail
I searching for a way to do high side current sensing on a -1100V DC rail.
My HV is generated from the hamamatsu C9619 High voltage power supply module and it powers the hamamatsu R647P ...
3
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2answers
111 views
High side current sensing for negative high voltage
I need to monitor the current for a negative high voltage supply.
I implemented the following circuit in a simulation program:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/1867
But ...
0
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2answers
160 views
Overcurrent Sensing
I am designing an overcurrent protection circuit. I am sensing current with a LEM sensor across a sensing resistor of 16.5 ohm. The voltage drop for maximum current is 2 V. In the next stage I am ...
2
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0answers
134 views
High voltage 1100 V current sense on the high side
I have the circuit that you see below.
My load is a photomultiplier tube equivalent to a 3.63Mohm resistor.
My power supply can deliver max 4W (2kV and 2mA). I use it on 1100V and the load draws ~...
2
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1answer
362 views
Noise problems in current sensing
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
I am using a motor from an electric bike, as a generator and I am rotating it using a drill, to test ...
0
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1answer
286 views
Low side current sensing
I’m making a BLDC motor controller application. The motor control IC (Allegro A4931) uses low side current sensing (R7,R8,R9) for controlling the motor. Unfortunately the motor IC does not output a ...
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2answers
142 views
Placement of sense resistor on DC-DC converter
For my design I am using DC-DC converters LTM4620 and LTM4644, which integrate the MOSFETs and the inductor in the chip.
For measuring the output current, I will add a sense resistor in each output ...
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0answers
50 views
Problem simulating LMP8645 current sense amplfiier in LTspice
Basically the problem i am getting is that the output offset voltage is extremely large (58mv)
here is the datasheet for the amp: http://www.ti.com/lit/ds/symlink/lmp8645hv.pdf
on page 9 it shows ...
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1answer
909 views
How to measure DC current with a microcontroller?
I have a project where I need to measure DC currents in the range of 0-150 A. I am using an STM32F446RE MCU. I can't use the solution where I convert current to voltage using resistors and reading ...
0
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1answer
170 views
high side vs low side current sensing in isolated bench power supplies, does it matter?
I'm trying to make a couple of mains isolated, transformer based, bench power supplies. Considering that the current sense resistor will be in the PSU box and external loads will not have access to ...
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0answers
119 views
High side current sensing in BLDC motor?
I want to measure DC current flow through the 48 V battery in bldc motor (through Inverter circuit). Are INA 282, INA 169 work properly or not? Since my battery motor specification is 48 V, 5 Amp, 250 ...
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2answers
115 views
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% ...
1
vote
1answer
107 views
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 ...
0
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2answers
41 views
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 ...
0
votes
1answer
348 views
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 ...
1
vote
2answers
362 views
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 ...
5
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1answer
151 views
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 ...
1
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1answer
92 views
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 ...
1
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2answers
2k views
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 ...
0
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2answers
108 views
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 ...
1
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1answer
51 views
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 ...
0
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1answer
547 views
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 ...
2
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3answers
566 views
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 ...
1
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1answer
340 views
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 2kV power supply. Here is a link of an article which I am referring.
https://www.maximintegrated.com/en/...
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1answer
223 views
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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3answers
820 views
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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1answer
76 views
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 ...
0
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1answer
139 views
closed loop hall effect sensor operation
I know that closed loop hall effect sensors use the generate a current in the secondary winding to oppose the flux in the core such that the flux will equal zero and at this point the current in the ...
0
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2answers
401 views
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 ...
0
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1answer
143 views
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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vote
3answers
392 views
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 ...
0
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1answer
76 views
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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1answer
428 views
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 ...
5
votes
2answers
1k views
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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4answers
2k views
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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2answers
199 views
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 ...
0
votes
2answers
691 views
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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vote
1answer
818 views
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 ...
