Questions tagged [shunt]

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2
votes
3answers
207 views

large voltage spike over shunt resistor even at no load

I'm trying to build a stepper-motor driver. Each windig is driven as shown: at the moment, im feeding this with PWNM signals of constant duty cycle, just to see how everything response. (PWMs are ...
0
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2answers
58 views

Wrong ground reference producing wrong output on ADS1115

I am currently working on a project, which involves measuring current in a DC circuit and storing that generated data on an arduino microcontroller. I decided to go with the ADS1115 and a shunt, which ...
0
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2answers
64 views

Understanding purpose of a resistor in reference schematic TIDU034

Gents, I'm analyzing this schematic, but do not understand couple of things. I would be grateful if someone could explain in detail these questions: 1) R6 - shunt? What's the purpose of it? Under ...
0
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2answers
78 views

Poor Buck Converter Current Limiting?

I am planning on using the XL7026 buck converter IC in an upcoming project because of its dirt cheap cost, small package and wide input voltage range. However, there is one concerning aspect of the ...
0
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0answers
30 views

Shunt Resistor Color Code wrong or different [duplicate]

For a project, I was tasked with identifying some components. To identify all the resistors, I use the digikey calculator which so far gave me correct values. However, with that specific resistor ...
0
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0answers
75 views

Measuring micro-amps with INA series

I'm designing BLE devices and other low power embedded systems that can consume very low energy in the range of a few micro-amps. I can't afford any expensive precision multimeters. Hence, I'm trying ...
0
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1answer
86 views

Measuring output of op-amp current shunt circuit using ADC

This is my first post here, so I hope I have done it correctly. I am rather new to analog circuits, so undoubtedly I've overlooked something. Here is what I want to do: Using a 24-bit LTC2400 ADC, ...
0
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1answer
58 views

Question regarding shunt regualtor using zener diode

simulate this circuit – Schematic created using CircuitLab I am not able to get proper 3.3volt output at the output capacitor. Since 3.3 volt zener diode have been used, there is a drop in the ...
1
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1answer
40 views

Shunt resistors difference

What's the difference between metal and normal high wattage resistors?
1
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1answer
359 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
votes
2answers
158 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
votes
1answer
29 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
238 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
50 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
votes
2answers
205 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
276 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
69 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
134 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
55 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
76 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 = ...
1
vote
1answer
214 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
70 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
70 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
votes
2answers
324 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
vote
1answer
263 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
votes
1answer
376 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
votes
1answer
39 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
votes
1answer
141 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
vote
2answers
169 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
votes
1answer
82 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
176 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
votes
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
votes
2answers
3k 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
263 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
127 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
58 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
888 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
vote
1answer
1k 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
188 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
votes
2answers
228 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
votes
2answers
270 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
votes
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
votes
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
votes
0answers
79 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
votes
3answers
179 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
votes
1answer
87 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
vote
2answers
436 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
votes
1answer
209 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
votes
1answer
39 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
votes
1answer
427 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 ...