Questions tagged [shunt]

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1
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1answer
39 views

Shunt resistors difference

What's the difference between metal and normal high wattage resistors?
1
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1answer
139 views

Why is my Voltmeter/Ammeter not reading amps correctly?

I am having problems correctly setting up my volt/ammeters. I am attempting to use them to monitor a boost converter I recently purchased. I would like to have one set up on the input of the boost ...
0
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2answers
106 views

Can I use a regular 2512 SMD Resistor (0.001 ohm) for HLW8012 IC shunt Resistor

Can I use a regular 2512 SMD Resistor for the shunt resistor as current sensing resistor for the HLW8012 power meter IC. As per the data schematic, the manufacturer recommend to use a shunt resistor ...
0
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1answer
27 views

What is the predictable difference of the voltage drop between the V+ and V- lines on a shunt resistor?

I am making an electronic speed controller, and the half-bridge driver I am using has a built-in overcurrent protection feature. In order to utilize this feature, I have to supply the pin (a ...
1
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3answers
192 views

Current measurement with shunt

I need to measure pretty high currents (maximum 100A) flowing from one battery to another. I came up with a solution involving the measurement of the voltage drop across a shunt resistor. The supply I'...
0
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0answers
42 views

Current sense trace vias underneath shunt resistor

I need to connect current sense traces from a shunt resistor to my PMIC on the other side of the board. Due to space constraints, I'd like the traces to pass through vias directly underneath the shunt ...
2
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2answers
126 views

Full wave rectification by opamp

I am trying to read a current waveform from a shunt resistor series with the power line. Using a full bridge rectifier, I got the following waveform: The waveform was sampled every 2 millisecond ...
0
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3answers
162 views

2000A current sensing using STM32

Is there any chance to read 2000A using STM32? I searched the Internet for low-value shunt resistor but nothing found. maybe some kind of current transformer could do the job!! any help will be ...
0
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0answers
62 views

Current Transformers

I have a question about current transformers being used to measure AC currents. Say for example, we have a 50/5 amp current ratio, meaning that when there's 50 amps on the primary, there will be 5 ...
1
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0answers
105 views

High pass shunt filter

I have a DC motor, which is used as an electromagnetic brake. However I want to leave certain frequencies uninhibited, so I thought this should be possible by adding a shunt filter on the DC motor ...
0
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0answers
45 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 ...
0
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0answers
49 views

Shunt Shunt Feedback SImulations

I am trying to simulate the solution to an old text book example on a simple Shunt-Shunt feedback amplifier. simulate this circuit – Schematic created using CircuitLab The book only shows BF = ...
0
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1answer
152 views

DC Shunt Motor Load Loss

I have three DC shunt wound motors in series. Each motor has a coupling to a transmission. I am trying to work out (mathematically, as opposed to intuitively), what happens if the coupling was to drop ...
0
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2answers
49 views

What could be the output current rating of the following shunt regulator?

I am trying to solve the 2013 paper set by ISRO for electrical engineers. I wanted to verify if my answer to Question no 18 is correct. So \$I_L\$ is being drawn out of the circuit shown. Since the ...
0
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2answers
66 views

Does short circuit always (in every electronic circuit) shunt the resistor that has both sides connected to the short circuit branch? [closed]

I wanted to know if short link always (in every electronic circuit) shunt the resistor that has both sides connected to the short link branch
-6
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2answers
223 views

Shunt resistor with ADS1115 [closed]

I am trying to develop an off grid solar monitoring system. In order to measure solar input current I am using a 50 A/75 mV shunt with an Adafruit ADS1115 (VDD=5 V). However, when I ...
1
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1answer
215 views

Constant current source with shunt fet

I'm want to create a project with a LED strobe with IR LEDs. As LEDs the Osram SFH 4249-UV will be used in strings of 15 LEDs and 32 strings parallel. This results in a Vf of 34.5 - 45 V and a If of ...
2
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1answer
272 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 ...
0
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1answer
35 views

Measure unknown load resistance on battery terminal

I need a method to measure the load resistance attached to the terminals on a battery. I want to determine this load before I turn mosfet on to let battery pack discharge. Most important I want to ...
-1
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1answer
132 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....
1
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2answers
137 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'...
0
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1answer
80 views

12 volt 8000 watt battery discharge protection

We built a home in a country where electricity is a rare ressource. In order to have energy available all day we bought a bunch of solar panels and several 12 volt batteries. We then used a 8000 watt ...
0
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2answers
115 views

3.3v Zener Diode Shunt Voltage Regulator giving a 4.3v output

We are trying to use a zener diode shunt circuit to develop a voltage regulator. Our input voltage is 5v. Our desired output voltage is ...
10
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2answers
1k views

Shunt resistor, what value should I expect when soldering on PCB?

I am using a 10 mohm 1% shunt to measure current via voltage drop. My circuit is on a breadboard... It behaves as if the shunt has a value of ~30-40 mohm instead of 10 mohms. I double checked this ...
4
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2answers
2k views

Simple Op-Amp setup for current sense has a strange working range

I am using a LM358D dual amplifier at the moment and my goal is to measure over-current on 2 motors. Before I'll be doing that, I made a test setup to test the equations and check the output signal of ...
0
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2answers
226 views

SMD jumper vs current sense resistor

I need to use some sort of jumper to allow heavy current from terminal block to the relay pins: Dimensions shown in mm. I want to replace this trace with a jumper, preferably SMD. Going through ...
0
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1answer
107 views

dividing voltage of shunt Vref Lm4040

the whole thing i'm trying to do for about 3 mounth's is measuring IR-level with high accuracy, i tried many newbie circuits with huge noises, unstable results etc.. then i focused on ADS1110, an ADC ...
0
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0answers
37 views

LTspice modelling for the end terminal side

So I have this model. I am trying to build a current/voltage converter circuit for a bus carrying current to the other end of the bus, because I need to give this voltage output from the amplifier to ...
2
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3answers
696 views

Use MOSFET series resistor instead of shunt for current measurement

If I have a setup where a N MOSFET drives a heavy inductive load (say, 25A peak), can I use the MOSFET's internal resistance to measure said current the same way I would use a shunt resistor? The ...
1
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1answer
991 views

Series-shunt feedback analysis

Microelectronic Circuits by Sedra/Smith present a method to analyze series-shunt feedback circuits by separating the 'A circuit' from the 'B circuit' in which h11 and h22 are consolidated into the 'A ...
0
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2answers
146 views

Wide range and high precision current measurement

I need to measure current over a large range from a few µA up to 2A. The application is sensitive to noise at later calculations with the measured current. My idea is to use different shunt resistors ...
3
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1answer
122 views

Downsides of using an existing length of wire as a shunt

I have an isolated electrical system composed of a couple of solar panels, 4 x 6V batteries and a 12V -> 120V inverter. I'd like the measure the current flow in and out of the batteries in order to ...
0
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2answers
233 views

Transimpedance Amplifier (TIA) - How to shunt high current spikes?

I am working on the design of a high-bandwidth transimpedance amplifier (TIA) to detect a relatively weak optical signal (100μW) but also be able to withstand short pulse, high power optical signals (>...
2
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2answers
1k views

Converting a galvanometer into an Ammeter

I am 12th grader just in case. Anyway, I do understand how a galvanometer is converted into an ammeter but it's logic doesn't seem to add up. This is what I know so far. Galvanometer is too sensitive ...
0
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1answer
64 views

hardware interfacing and data logging

I am working on a idea. The idea is to measure current from a current source, which transmits 3 levels (ex: 10 20 30mA). Which if possible should be logged, representing 3 states with 3 different ...
0
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0answers
62 views

HF current measurement

I have an assignment, where i'm supposed to (sort of accurately) measure the current drawn by a SIM-card, in the different phases it can operate in. The current is by no means DC, as the SIM-card ...
-2
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3answers
165 views

Should a shunt in an ammeter be changed when the voltage changes? [duplicate]

Supposing I want to measure 1-5A over a range of 1-40V on an ammeter, should I change the shunt resistor every time the voltage changes so that the voltage drop across the shunt resistor stays the ...
0
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1answer
84 views

Constant voltage using shunt regulator

I need to detect a Logic high / Low (at my MCU). This input will come from an external circuit (having common ground with my circuit). My MCU support max 2.8V at the GPIOs. I have designed the below ...
1
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2answers
343 views

Is it possible to measure the voltage and current of a load with this circuit and Arduino?

I'm trying to measure the voltage and current for a DC-AC converter in my car with Arduino. I know it would be easier, more accurate and cheaper to use breakouts with INA226 like this. But this ...
0
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1answer
186 views

PCB Shunt BLDC controller current sens

I was building an ESC. Motor V=22V max current I=90A Battery max current I=60A. My controller is a MIC4607 (Datasheet:http://ww1.microchip.com/downloads/en/DeviceDoc/20005610B.pdf) The PWM f=16kHz but ...
0
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1answer
38 views

The reason why the output of ZCS-controlled boost converter is 1.2V,not 1V in this paper

Here is the three stage stepping up architecture,and in the paper,the author said that when \$ V_{out} \$ increase up to 1V,shunt connecting the capacitors \$ C_{DDi} \$and \$ C_{out} ...Finally,the ...
0
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1answer
334 views

Differential op amp to measure negative current flow through shunt (Rails set to 0 and 5v)

Note* I have done some searching and though there are related topics to this one, this one is unique and I think it warrants its own Question, especially as asking additional questions on another ...
1
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4answers
1k views

Convert millivolts from shunt on DMM on a 50A, 75 mV Shunt

Please excuse my awful math/s. Can anyone please help me calculate/convert the mV reading from a 50A shunt? For example if i was reading 1.5mv how do i convert please. Please keep it simple as math is ...
2
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1answer
51 views

Split a Signal Based on Frequency for High-Power Applications

Normally when one wants to do analysis on a signal based on certain frequency ranges the obvious choice is to filter for those individual ranges and then conduct the analysis based on the result. ...
5
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4answers
3k views

4-terminal shunt resistor [duplicate]

What is the importance of a 4-terminal shunt resistor? What is real purpose behind using two seperate terminal for the voltage measurement across the shunt resistor?
3
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2answers
415 views

Shunt ohmmeter question

I have a question concerning this shunt ohmmeter: If we only want to use the \$R \times 1\$ gauge, we have the following circuit: I want to know what indication would appear on the ohmmeter if I ...
-1
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1answer
538 views

DC motor rpm slower than the rated rpm [closed]

A seperately excited shunt dc motor of 336 KW with rated rpm from 500-700, when it is operated on 420 rpm what will be the effect of current on it?
0
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2answers
404 views

Wiring and programming a shunt with Arduino for 2 way current sensing

I am trying to develop a battery monitoring for a solar system. I have a shunt which is rated at 500 A, 50 mV. and I want to measure current in both directions here. I plan to use the amplifier by ...
0
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2answers
411 views

how to get a clean AC current waveform for power-factor calculations

I've been doing a project to figure out the power factor of a load by comparing the zero crossings of the voltage and current signals (of a AC signal) and hence finding the phase difference using an ...
11
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8answers
2k views

Measure wide range of current 800 µA - 1.5 A

I am having difficulty measuring current into an IoT device that I am making. I need to be able to gather data about power consumption over time, and about the sleep mode current. I was trying to use ...