Questions tagged [current-sensing]
The current-sensing tag has no usage guidance.
35 questions with no upvoted or accepted answers
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Window current detection through a current sense differential amplifier and a comparator
I'd like to implement a circuit to detect the over-current through a grounded load. The limits for that current are either 3mA DC current or -3mA and 3mA in case of bipolar AC current. I want to ...
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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 ~...
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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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2
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Input Filter for Current Sense Amplifier - ODrive
Out of curiosity, can anyone explain to me why the input filters for the current sense amplifiers in the old ODrive schematics are unbalanced (i.e., the external resistor is only on the negative CSA ...
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Removing the effects of Parasitic Inductance in current sense resistor – Low side current sensing
We are evaluating MIC21LV32 from microchip in one of our applications.
For the current sensing we have used 3 mΩ sense resistor (1206, 1 %, 1 W), as these sense resistors have higher ESL+ parasitic ...
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94
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AC Current Sensing LED indicator circuit
I'm playing around with a circuit to drive a LED based on the output from a current sensing transformer. The idea is to have the LED appear proportionally brighter with the output from the current ...
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236
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Detect Battery Insertion in USB Charging Circuit
I'm using an MCP73831T as the charger IC, I've figured out how to detect the charging/charged, this was easy, however, I would like to know when the battery is actually plugged in, I know when the usb ...
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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 ...
- 1,078
1
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0
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74
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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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1
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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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1
answer
223
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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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1
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Makerbase TMC2226 stepper driver board: are current sense resistors underrated power-dissipation-wise?
I am looking at the schematics for Makerbase TMC2226 stepper driver board:
The schematic shows 1/8W 0.11 ohm current sense resistors.
The datasheet for TMC2226 IC says:
8 Selecting Sense Resistors
.....
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0
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0
answers
62
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Current sensing in DC-DC converter
I studied DC-DC converter in peak/valley/average mode control and I have a question about the methodology to sense the current in average current mode control. I saw lot of paper about DCR sensing but ...
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Unipolar stepper driven PWM to reduce voltage
I need to drop voltage for unipolar stepper motor with winding resistance 50ohm and inductance 40mH (measured with generator and oscilloscope for equivalent circuit Rout + (Rl + L)). Available Vcc is ...
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75
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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. ...
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2
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360
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Designing a current sensing op-amp circuit for an AC load
I'm trying to simulate a current sensing op-amp circuit. My AC voltage, 24 VAC, is across a load of 10 Ω. I used a 100 μΩ resistor and measured the voltage across it using an op-amp.
Looking at some ...
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How do I make the circuit to sense the collector current for the FAN1100-F085?
I am trying to design an ignition coil driver using the FAN1100-F085 IC and a ISL9V3040x3ST−F085C IGBT.
I am having trouble understanding the datasheet when it comes to the current sensing. It says to ...
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0
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SCR falsely triggered on startup (battery low current monitor)
I'm trying to build a li ion low charge current detector and cutoff circuit as a complement to my battery charging setup. Charging should be disconnected when the current reaches 400mA or below. I'...
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171
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Current Sensing Trace Routing
I'm developing a motor control board (sensorless FOC). I have a question about the differential pair traces, they are very long (the longest is about 80 mm) and crosses several gate lines. How bad is ...
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71
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Self powered current sense in tapped inductor buck converter
I am interested in designing the autonomous (both turn on and off) high-side high-voltage switch proposed in this paper. The proposed topology of the high-side switch is as follow:
Auto-turning on is ...
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How to sense the current an amplifier is supplying?
Consider the circuit below. It is made up of three parts: input, bidirectional amplifier, and output. If we set the gain of the amplifier to 1, then it as if we've just connected the input to the ...
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Choosing the kind of current sensing method and the voltage of the testing signal for a DIY LCR meter
I have been designing my own LCR meter that uses the V-I method to make measurements. I have finished the sine wave generator and processor side, but I got stuck at the sensing part.
Here I have 3 ...
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143
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Help understanding conflicting results from INA190 current sense amp
Built a board for a drone that has a few things onboard, though the one that is messing me up is the current sense chip, INA190, though it's most likely not the problem.
Picture 1 show the big yellow ...
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303
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Current sense resistor vs transimpedance amp vs hall effect current sensor for instrumentation?
I'm using a photomultiplier tube; this creates a current output relative to the number of photons incident to it, on the magnitude of microamps. So, I need a precise and accurate way of measuring very ...
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68
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Sensing Ground Faults on a High Voltage Pulser - Coupled Inductor Issue in LTSpice
I am building a ground-fault protected High Voltage Pulser. The pulses may be as high as 500V and as narrow as 50us (20kHz).
The question of how to create GFCI protection is proving to be a ...
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394
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How to average output of current sensor to get smooth output?
I am using INA138 current sensor with 100Hz, PWM duty 5%, 8-bit resolution signal load is a resistor,
I getting zero readings while actual current readings also appear,
edited -
zero current sense ...
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139
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Designing high bandwidth current sensors for inductor current sensing
I am designing a high-frequency current sensor, suitable for sensing +/- 20 Amps at frequencies of 200kHz. This is being used in average current mode control application in an isolated forward ...
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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....
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1
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148
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Output current and voltage levels regulation in ac/dc adapter
On the picture below is the output circuit of AC/DC adapter. I understand how voltage level contol works, but I don't understand how exactly current limitation works and how should I calculate ...
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1
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Measuring high currents with toroids
I got a PT27312 current sensor (datasheet), I wonder if I can use it to measure currents up to 100A AC/DC.
I couldn't find any specifications in respect of the current measurement range.
I only know ...
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234
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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 ...
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254
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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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Method for sensing fault currents with microcontroller
How do I choose a proper approach for detecting ground fault currents (20 mA through 30A, 60Hz)? Let's say I have a zero sequence CT and calculate a burden resistor. I have a 12-bit ADC in the micro. ...
user115094
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ACS71020-I2C data read problem
I recently working on ACS71020 with I2C communication .I will attach my module details, code and my results. The slave address of the I2C keeps changing and even If I turn on the supply the measured ...
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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 ...
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