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Questions tagged [shunt]

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0
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0answers
47 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
87 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
39 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 ...
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0answers
25 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 = ...
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1answer
75 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
45 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 ...
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0answers
31 views

shunt resistor with solar panel

I'm wondering whether the connection of the shunt resistor in this image is correct? and not having any grounding problems? Because i have already connected my shunt resistor with solar panel and ...
0
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2answers
63 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
-3
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1answer
82 views

shunt resistor with ads1115

I am trying to develop an off grid solar monitoring system. In order to measure Solar input current I am using a 50A/75mV shunt with Adafruit ADS1115 (vdd=5v). But when I connected to A0, A1 in ...
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1answer
155 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
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 ...
0
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1answer
32 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 ...
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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....
1
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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'...
0
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1answer
75 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
79 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 ...
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2answers
152 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
76 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
29 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
votes
3answers
482 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
774 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 ...
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2answers
109 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
83 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
168 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
828 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
63 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
53 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
154 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
79 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
273 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
130 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
35 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
282 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
50 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. ...
4
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4answers
2k 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
340 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
455 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
311 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
345 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 ...
10
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6answers
1k 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 ...
0
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2answers
3k views

how to find armature current in dc shunt motor in given question?

A 8.8 kW, 220 V, 1200 rpm dc shunt motor has armature resistance of 0.1 Ω and field resistance of 100 Ω. The rotational loss is 2200 W. Compute: a) The rated load torque on the shaft. b) The ...
2
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2answers
128 views

Currect measure through ADC and shunt

I spent some time already and I think I forget about something in my problem. I have a motor, which single phase is R17 = 2 Ohm. I want to measure a current through it's circuit. I used a shunt with ...
1
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2answers
148 views

Detecting a DC current

I want to detect if the electronic locker in my differential is functioning. The differential locker is essentially a solenoid that engages the axle locker, however since the wire runs under the ...
1
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2answers
406 views

Measure Battery Current via Shunt

I'm working on a project where I'm measuring the current into/out of a battery (currents may be as high as approximately 150A, and I'm not aware of any hall effect devices that are continuously rated ...
0
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2answers
425 views

How can I measure the current and voltage of each source in a DC circuit with multiple sources?

In my off grid house I have a hydro-electric turbine and two separate solar arrays, each producing power at between 0 and 14.7 volts; nominally 12. The amperage varies, but the while system can peak ...
0
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1answer
3k views

Why does armature current increase when load on the DC motor increase?

Does this load somehow decrease the resistance of the armature causing it to draw more current? Is it due to the torque the load will give to the motor?
31
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2answers
2k views

Why this small cut in Ampere meter shunt?

I have seen lot of ampere meter shunt like this. What is the reason for this small cut?