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Questions tagged [shunt]

Electrical shunt -- relating to a small resistance usually used to sense current. This is what your multimeter uses to measure current. This tag does not cover magnetic shunts.

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DC Electronics Load Part Capacity

Sure, here's your question translated into English: I'm working on developing a DC electronics load that I intend to discharge at up to 30V and 60A. For this, I'm using the FBSOA MOSFET IXTN200N10L2, ...
Bongjin's user avatar
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0 answers
51 views

Pulse DC reading

I'm trying to read current with INA186 on low-side. The shunt resistor calculations are ok, but the current sensed, comes from a pulse DC signal of a SCR. This SCR is rectifying the output of a power ...
samuel mattio's user avatar
1 vote
1 answer
82 views

500 A DC from shunt to battery bus bar, how do you carry the power? [closed]

System is nominally 12 V DC but it is connected to LiFePO4 batteries so the charging voltage is 14.4 V DC. There is currently 900 AH of battery capacity, soon to be 1200 AH. Load side is 2 inverters ...
boatcoder's user avatar
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Car side-mirror dimmer simulator circuit - DIY

Would like to make a simple car side-mirror simulator circuit. The side mirrors I installed (for better blind spot) do not have a dimmer circuit and I am getting LIN bus errors since the dimmer wires ...
fe7565's user avatar
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1 answer
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Output Voltage Feedback Circuit interpretation

I see reference design of Texas Instruments PMP40766 Universal input, 500-W CC/CV e-Bike charger reference design , In the design I don't understand the reason of diodes at the feedback circuit I ...
MSB's user avatar
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3 votes
3 answers
1k views

How do I tell if a shunt resistor is routed using the Kelvin method?

I am struggling to get my head around Kelvin PCB routing for shunt resistors. First how do I tell if a shunt resistor on a PCB is routed using the Kelvin method? Below are three images: THE TWO RED ...
JoeyB's user avatar
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2 votes
2 answers
148 views

Which shunt resistor placement is best?

I came across this picture in a LinkedIn post recently. I understand the reason behind the top two pics. The tracks are too thin to handle the current. However, I do not understand the bottom two ...
JoeyB's user avatar
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1 vote
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Permanent magnet alternator: what happens when windings get shorted together for voltage regulation?

Here is a typical scheme for a permanent magnet 3 phase alternator as found on many motorcycles and recreational vehicles, with rectification to DC via a diode bridge and subsequent voltage regulation ...
Bliss's user avatar
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Thermal EMF on shunts

I tested the accuracy of a shunt resistor of 20 μΩ by applying short pulses of 100 A. At lower current levels near 0, I noticed the sensed current had a variation of ±300 mA. I did some research and ...
404's user avatar
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1 vote
1 answer
61 views

Brushed DC-Motor with Shunt Winding running on AC?

Why can't a brushed DC motor with a shunt winding (stator and rotor windings are connected in parallel) run on AC? As far as I understand it, the stator current should switch polarity at the same time ...
user2276094's user avatar
1 vote
2 answers
55 views

Issue with influence between channels in a dual-channel high-side current sensing circuit

I've designed a two-channel current sensing circuit integrated into a board that outputs two separate signals. However, I'm encountering an issue where one channel seems to influence the other, which, ...
Bongjin's user avatar
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2 answers
113 views

How to use PSRR specification?

While working on the shunt regulator previously discussed here, I've found some high-voltage components that may reduce circuit complexity a lot, since they can be powered directly from bus voltage. ...
Maple's user avatar
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In case of a dc shunt motor, can you use the back emf equation(Eb=ZNPPhi/60A) for the shunt winding (field winding)?

In case of a dc shunt motor, can you use the back emf equation(Eb=ZNPPhi/60A) for the shunt winding (field winding)?
Abhinav Gawas's user avatar
0 votes
1 answer
32 views

Troubleshooting for Power Delivery with Shunt Capacitor

I have been trying to derive an equation to find the power delivered to R(load) for the following circuit In order to do so I used voltage division Which simplified equated tp Then using the fact ...
Fernando Harley's user avatar
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142 views

Can you use a shunt to turn off a disconnect switch?

I was wondering if a shunt could be used to turn off a disconnect switch such as this ABB OT40F3? I am designing something with high voltage (480) and couldn't find good options for relays that could ...
morbedtomeetyou's user avatar
1 vote
1 answer
280 views

HLW8032 energy meter circuit showing power usage at no load

I am designing an AC energy metering circuit. The circuit has to measure voltage, current, power, power factor and energy used for two channels (from the same source). The HLW8032 transmits 24 bytes ...
k.h's user avatar
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1 answer
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Output voltage of BJT shunt regulator in terms of input voltage

I am working through a tutorial to prepare for a test tomorrow and am completely stumped with a step in the algebra. The question is in the image below I am trying to complete b). I have understood ...
Mattster89's user avatar
1 vote
0 answers
83 views

Why are there (almost) no current shunt probes?

Most of the current probes for osciloscopes I can find are somehow magnetically coupled and have a high isolation and price. However, in PCB design shunt resistors are often used. Why does one not ...
Matthias Wälti's user avatar
2 votes
2 answers
256 views

Shunt regulation - discrete or linear? [closed]

This is a spin-off of the question I've asked before. I've received many interesting answers and summarized them there. I also accepted most interesting suggestion. During this time we also bought and ...
Maple's user avatar
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0 votes
1 answer
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Why would you ground your live terminal shunt resistor

I have seen some wiered things when taking the current measurement from a shunt resistor. For instance the below circuit simulate this circuit – Schematic created using CircuitLab What is the ...
JoeyB's user avatar
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1 vote
1 answer
156 views

Choosing a current sensing resistor for boost converter IC AZ34063U

I'm looking to build a boost converter using the AZ34063U IC (Datasheet) and the example circuits in the datasheet use different values, ranging from 0.22 to 0.33, and I couldn't figure out how I ...
nak's user avatar
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1 vote
1 answer
80 views

Biasing AC signal - which circuit is the best?

I've seen a similar question asked earlier here: How do I bias an AC signal for sampling? However, I have a 3 different circuits and I am not sure which one works best! I have: +-2V AC signal of ...
L'orealMenExpert's user avatar
4 votes
2 answers
127 views

Why is the shunt field of a DC starter-generator disconnected when used as a starter?

The Lycoming T53 turboshaft engine is started using a starter generator. The starter generator is a shunt generator. When the T53 is started, the starter generator is used as a DC motor to get the ...
theredlabcoat's user avatar
4 votes
7 answers
626 views

Zener Transistor regulator cascaded into 3-pin IC regulator

So I have a 48 V supply and want 5v output at sub 100 mA. The 78L05 is a super low cost 3-pin voltage regulator, but has a maximum input voltage of 30 V. I was wondering if it is a cost effective / ...
learnvst's user avatar
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2 votes
1 answer
298 views

Calibrating a high current shunt resistor

In a circuit I'm developing I have a shunt that is used for current measurement of +/- 80A. How can its calibration be done? Suppose our budget for this can be 1000 to 1500 USD, what would be the best ...
EarthLord's user avatar
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1 vote
1 answer
209 views

External voltage reference MCU RP2040 - Use of series reference?

I designed a board that uses the RP2040 Pico for its ADC and I/O. To improve the ADC of RP2040 I wanted to use an external reference. In the past, for other projects, I used as external reference a ...
Kostr's user avatar
  • 73
1 vote
3 answers
198 views

Shunt's thermal EMF (Seebeck effect) vs Kelvin connection?

While reading this Vishay document about shunts, I saw that temperature mismatch between the shunt's terminals can introduce a "parasitic" voltage drop which will in turn affects the current ...
HatimB's user avatar
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0 votes
1 answer
83 views

What is the benefit of using a 10MΩ resistor in parallel with a current shunt?

I am reading the Operators Manual for the Fluke 8588A Reference DMM and came across this: The DCI Ext Shunt function provides a calculated current reading for a specified current shunt by measuring ...
Tucker Black's user avatar
0 votes
3 answers
221 views

Can I use this voltmeter / ammeter without the shunt supplied along with it?

I bought this voltmeter online. It does not show current. Do I need to use 10 A load for some reading or it will work for lower amps also like 1 to 2 A? From the product details: Measure Current: ...
Naveed AA's user avatar
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1 answer
123 views

Measuring current with a microcontroller

I'm doing a project that involves sensing current. I'm charging a battery and I need to control how much current and voltage I'm giving out. I thought that it would be okay to use an SCR like a 40tps ...
samuel mattio's user avatar
1 vote
1 answer
1k views

Typical resistance of an SMD solder joint

Do you have an idea of the typical resistance between a PCB track and a SMD resistor pad? That is, the resistance of the solder on, for example, a 0402 resistor. The idea behind my question is that I'...
Sandro's user avatar
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3 votes
1 answer
613 views

How does a microwave oven transformer shunt help resonate the voltage doubling capacitor?

I was reading this great answer by Neil_UK, and a comment-question was: Comment Question 1 Are MOTs belonging to the general type called "Leakage/stray field transformer" ?en.wikipedia.org/...
MicroservicesOnDDD's user avatar
4 votes
5 answers
477 views

Why do these INA240 current shunt amplifiers keep failing?

We have over 100 current shunt amplifiers (Texas Instruments INA240A2-Q1 and INA240A3-Q1) monitoring durability testing of brushed DC motors (more specifically, fuel pumps). On our test boards, there ...
gtetil's user avatar
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0 votes
1 answer
194 views

How to compensate for shunt resistor thermal drift? [closed]

I'm working on a electronic load and below schematic is the simplified version of it. simulate this circuit – Schematic created using CircuitLab The problem is the thermal drift in resistors ...
ElectronSurf's user avatar
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1 vote
0 answers
37 views

Control scheme to regulate Vin using a Buck regulator

I am trying to create a control scheme that allows a buck regulator to regulate its input voltage instead of its output voltage. I'm trying to make an efficient shunting regulator. My current approach ...
reconchris's user avatar
1 vote
0 answers
59 views

Connecting the GND of an isolated circuit to the positive side of a 450V transformer output

I moved to a new company that makes very big old-style controlled rectifiers. They asked me to make a new modified, and enhanced thyristor-controlled rectifier. The strangest problem I faced is that ...
AlMoutaz Billah's user avatar
1 vote
1 answer
258 views

Amplifying millivolt signal to volts from shunt resistor for current detection: Single supply or dual supply op amp?

What are the pros and cons of configuring an op amp to be a single supply op amp vs a dual supply for amplifying very small signals? I am using three of the OPA177GP op amps to build a 3-op amp ...
Tim Caleb's user avatar
0 votes
1 answer
686 views

Why diode in parallel with shunt resistor?

I would like to know why diode is used in parallel with shunt resistor (Current sense). I am assuming it is to protect a shunt resistor if voltage drop is more than 0.7 (Vf of diode) in case of high ...
sangraemelb's user avatar
2 votes
1 answer
160 views

Current sensing resistor placement [closed]

I will be adding a current sensing resistor to a Buck-boost DC-DC converter. Based on the IC datasheet, the resistor is placed at the low-voltage side next to the power inductor. But, as far as I know,...
Bananabread's user avatar
13 votes
6 answers
4k views

How to measure current up to 1000A and not go bankrupt

I need to measure current going through my PCB, which can be anything between -1200A to +1200A. Accuracy within 1-2% with bandwidth of anything higher than 50kHz. The conductor is decided by now - I ...
TQQQ's user avatar
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0 votes
1 answer
141 views

Where should I position my shunt resistor?

I am measuring sun irradiance captured on several small solar panels. The power generated from the panels is not consumed; The measuring device is independently powered; My focus is on high-precision ...
GlennB's user avatar
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0 votes
1 answer
51 views

How to calibrate a shunt with a MM and another shunt

I had noticed someone in my lab calibrated a shunt with a MM and another shunt, was wondering how they went about this? Thank You
wavelength's user avatar
2 votes
1 answer
655 views

Replacing current shunt resistor with different value. Is there a problem?

I have Nitecore UM2 (2 slot) battery charger whose current sense/shunt resistor of 0.1 ohms R100 (package 1206) blown. I replaced with working slot to see if everything works good and it is. I am ...
Paul's user avatar
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1 vote
2 answers
215 views

Why add extra resistance to a shunt?

simulate this circuit – Schematic created using CircuitLab I'm using a Fluke Y5020 air cooled shunt (it's 10 mΩ, 20 A max) and putting 3 A at 60 Hz into it. Aside from Ohm's law, is there any ...
wavelength's user avatar
3 votes
2 answers
147 views

Preventing mains spikes from cheap water pump

I bought a pack of add-ons for my DIY CNC that has a water cooled spindle. One of the items was the water pump. But when I switch on the pump, a fairly substantial crack can be heard in any speakers ...
Kez's user avatar
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0 votes
1 answer
104 views

What are these PCB calibration standards?

I found these shunt resistors in a paper that uses them to calibrate AC equipment for EIS testing. They used the "frequency dependent complex impedance response" of these standards to ...
square potato's user avatar
1 vote
1 answer
133 views

Shunt resistor between differential lines before differential amp

I wonder that why is the shunt resistor used between differential lines? After I took a look the schematic of VR sensor interface, they suggest me to put shunt resistor. The shunt resistor can prevent ...
bcdyzi's user avatar
  • 87
2 votes
1 answer
495 views

High Current (100A) Shunt resistor mounting method

In my design I want to measure the current going through a load with a shunt resistor. Based on some preliminary calculations, I've selected WSBS85181L000JK34 from Vishay. Being my first time using ...
StefanoN's user avatar
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0 votes
1 answer
74 views

Component selection in high side mains current measurement

I need to measure relative small currents (10 mA to 500 mA) from the high side at mains voltage (230 VAC RMS) levels. I also need a high resolution and preferably high accuracy for the measurement. ...
entropiae's user avatar
2 votes
1 answer
83 views

What circuits can blink an LED at certain power consumption threshold?

I have never designed an analog circuit and I am requested to design an analog circuit where a LED driven by a transistor must start blinking at a given frequency when the input power is above a ...
acefrrag's user avatar

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