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Questions tagged [current-limiting]

Current limiting is the practice in electrical or electronic circuits of imposing an upper limit on the current that may be delivered to a load with the purpose of protecting the circuit generating or transmitting the current from harmful effects due to a short-circuit or similar problem in the load.

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Combining a differential amp and current limiting circuit

I've been experimenting with a very simple current limiter that regulates the current through a solenoid with a 3-4 ohm resistance. The external driving circuit is a PWM switched N-Ch MOSFET ...
learnvst's user avatar
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56 views

How can I wire four Peltier modules in parallel with current limiting?

I am currently working on a project to cool different materials for a local young student program with engineering. My thinking was to attach Peltier modules to different materials and, using an IR ...
callen12's user avatar
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Can I use the CC/CV converter as the LED strip driver?

I have a power supply - Molex from power supply unit (5V, max current - 11A). Besides lighting there are other consumers that do not need current stabilisation. I want to power 9 ws2812b LED strips ...
phony51's user avatar
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1 answer
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Need for current protection on low current digipot

Context: I am designing a power control system for a 24v 300w halogen lamp and to do this I am taking a stock buck converter Here with current and voltage control, removing two potentiometers and ...
Shai Morrison's user avatar
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1 answer
44 views

Designing a reed switch circuit

I have been trying to design a door contact sensor. Almost 90% is completed, but I am confused about this reed switch circuit. The problem with the circuit is it is consuming too much current I am ...
Aakas Pulikkal's user avatar
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34 views

Current limit resistor calculation zener diode

I designed an overvoltage protection circuit. My input voltage is 90V, and I need overvoltage protection at 90V. However, I used a 91V zener diode in my circuit. I have a problem calculating the ...
Nitheesh's user avatar
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1 answer
63 views

Is it better to shut down an overheated laptop? [closed]

My brother and I were sitting beside a laptop. He was playing a game and we noticed the laptop was overheating. My opinion was to turn it off ASAP to prevent "Thermal runaway" and other ...
Michael George's user avatar
1 vote
2 answers
69 views

REF200UA current source issue with multiple voltage supplies

This is my first question on stack exchange, so if I don't follow any rules I apologize in advance and will try to modify my question to meet expectations! I'm working on a project where the goal is ...
ECPZ's user avatar
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MPPT Charge Controller with Priority Charging capability?

I am designing a solar power system which I would take deep into the Amazon forest to an indio village. They have no energy, and they like to have internet (StarLink) and a fridge would be really ...
Gunther Schadow's user avatar
0 votes
1 answer
58 views

Current limiting stopped working on a power supply

I have an old power supply (Tesla BS554) and all of a sudden the adjustable current limiter stopped working. The supply is designed to limit the output current up to 1 A, but I am measuring short-...
Atropin's user avatar
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1 vote
4 answers
286 views

Limit high current using LDO regulator [closed]

I need to heat up a nicrome wire using 4Amps to break an O-ring. I don't know exacly what is the size of the nicrome wire, so I cannot put a resistor in series, also I cannot dissipate all that heat. ...
Gonzalo García's user avatar
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3 answers
119 views

Reduce the current from a Li-ion battery with 6S 18650 cells and BMS to a motor [closed]

Beginner in electronics looking for advice. I got a 6S BMS board from AliExpress rated at 25 A. I need to reduce current to 5-6 A. The board goes in a mobile vacuum cleaner, its motor is max. 120 W. I ...
Aldas 's user avatar
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1 answer
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Par control in DC servomotor

How can I control the torque of a DC servo? Servo model: DS51150-180 https://i.ebayimg.com/images/g/pEkAAOSwmFNl4NkA/s-l1600.jpg The current in a DC motor, as well as in a servo, determines the ...
Gael Alejandro's user avatar
0 votes
1 answer
52 views

Input capacitor / Inrush current

I am developing an electronic control board for a brushless motor. The motor in question is part number FR_2057_B_FMM from FAULHABER. The motor is powered at 24V and 62.5W. For the three-phase ...
Kolia's user avatar
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1 vote
3 answers
85 views

Drive the current control pin with a voltage

I am aiming to use the TPS929160-Q1 LED Driver for a project. Basically I need to drive LEDs with PWM signal from a MCU (which this component can do very well) but the project also requires to be able ...
Nucrino's user avatar
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5 answers
158 views

Detecting 16 V AC with a GPIO

My project involves detecting a ringing doorbell. The doorbell circuit is 16 V AC and I want a low-voltage binary signal from it. The obvious way to me is to transform that electrical signal until ...
Jonah's user avatar
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0 answers
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Current Limiting Circuit with Comparator/ Threshold Comparator (current limit) switch Simulation

I am driving a stepper motor with an H-bridge and hex inverter and need to create a circuit that limits the current. I need help designing a circuit with a comparator that detects a current greater ...
Jay's user avatar
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3 votes
3 answers
441 views

Force equal current between 2 pins

Is there a way to force current to be shared equally between 2 pins? I need to supply 10A (at either 24 or 48V DC) through a connector. The simple way would be to use a 10A per pin rated connector. ...
Sandro's user avatar
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5 votes
3 answers
117 views

Programmable current-limit on mains

Using an incandescent light bulb in series with a mains-powered device is a well known trick to limit the current used by the device. It's great for testing devices you're unsure of. Unfortunately, ...
Celelibi's user avatar
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1 answer
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Protecting parallel loads

I have a project that has two separate sections that must be powered from the same power source. I do not know the resistance of said loads, but I know the power supply that each of them on their own ...
Ciro García's user avatar
0 votes
1 answer
125 views

Very cheap current limiter circuit [closed]

I need to design the cheapest possible current limiter. My system consists of: half-bridge driver - NCP5901BDR2G - with the enable pin (high state of the pin is enable, low state disable outputs), ...
piotr's user avatar
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1 answer
78 views

Programmable current-limit/e-fuse (+current monitoring?)

Short version: How best to make either a current limiting circuit or an e-fuse (both options are fine to me) so that I can set the limit from software (and not through a fixed resistor as usual)? ...
Sandro's user avatar
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2 votes
1 answer
145 views

Necessity for USB current limiting with Raspberry Pico

I have a couple of questions related to a project based on the Raspberry Pico. I'm using the USB port of the Pico only to power it, not for communication. The Pico has 47uF of capacitance on the VSYS ...
trevor's user avatar
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1 answer
163 views

Not able to get enough current from buck boost (sepic) converter made using TL494

I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
Logesh-0304's user avatar
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1 answer
568 views

How to create an electric fence for slugs and snails using a car battery

There are electric fences that are made using a regular 9v alkaline battery and two wires. One wire connects to the positive terminal, the other wire to the negative, and they are wrapped around the ...
oak savannah's user avatar
0 votes
1 answer
69 views

Powering a tablet from 5V, how to regulate current draw?

I'm making a circuit that controls a 24V led strip, but it has some extra peripherals too, mainly some buttons to interface with. However, I also want to attach a micro usb cable, so it will be able ...
Slalamander's user avatar
0 votes
1 answer
54 views

Limiting current/power dynamically

I recently installed solar panels and now I was looking at using the energy as efficient as possible. All the energy produced I don't use goes to the grid, I get a small amount of money for that. I ...
YentheO's user avatar
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2 answers
247 views

How to understand current limiter circuit

Here the MOSFET IRF9530 works in linear mode of operation and transistor works in forward active. Load resistance is 5 Ω and up to 15 Ω I can keep this MOSFET is linear mode and on increasing further ...
Praveen Kumar's user avatar
0 votes
1 answer
77 views

How to properly calculate current limiting resistor for unknown part?

Newby question here ;) I have pulled apart a kids toy containing a small laser. The laser part doesn't have any partnumber on it, so I did some measurements on the actual device. Please note that I ...
Mar Tijn's user avatar
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0 answers
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Proper DC supply vs batteries

For the current limiter circuit(using voltage regulator), proper DC supply matches the simulation results. However, when a battery of equal supply voltage is connected, the circuit goes haywire i.e. ...
Soham Ghaisas's user avatar
0 votes
2 answers
77 views

Limit voltage in a car

Is there a simple way or is it even possible to limit voltage in the circuit of a car? Let me explain my problem, I’m experiencing voltage drop while cranking that is too low for the ECU to open the ...
Hayden Black's user avatar
2 votes
2 answers
109 views

TPS2553 Current limiting for RGB LEDs

I'm building a keyboard which will use SK6803 mini-e LEDs (ws2812 driver). I'm using a Pi Pico and as such the USB limit for current draw is ~500mA. I'm looking to limit the current draw from the LEDs ...
printsmith3d's user avatar
0 votes
0 answers
53 views

TPS2553 Current limiting [closed]

Editing this so it can be deleted for double post reasons. I'm building a keyboard which will use SK6803 mini-e LEDs (ws2812 driver). I'm using a Pi Pico and as such the USB limit for current draw is ~...
printsmith3d's user avatar
-2 votes
1 answer
81 views

Effect of limiting current of a lithium cell [closed]

I was curious as to what happens to the remaining amperage after the value needed has been dissipated from a battery. If I want 1 ampere from my battery at 4.2 volts and my battery is able to supply ...
imran muhd's user avatar
0 votes
0 answers
54 views

Current limiter tight tolerance

Background: The existing current limiter in the design has a relatively large tolerance primarily because of the component tolerance of the current limiter transistor. Note; the temperature and ...
Cuba havana's user avatar
4 votes
1 answer
762 views

Why is this circuit not limiting current?

This is a 15V voltage regulator from Art of Electronics (page 694), and it is supposed to limit the output current to 1A. However, when driving load impedance (R7) low enough, I am getting much higher ...
Atropin's user avatar
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0 votes
1 answer
71 views

Current limiting circuit: Need for replacing the pass transistor with MOSFET?

The article says "The circuit provides an approximate constant current at high voltages, but it doesn’t enter regulation until it reaches nearly 60V due to the base current the transistor ...
Dynamic_equilibrium's user avatar
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0 answers
65 views

LEDs without resistors in parallel circuit

I have connected 75 WS2812B LEDs in parallel circuit as shown in manufacturer's datasheet: Source: https://www.tme.eu/Document/64e8d425b90f84990264129a9679149c/WS2812B-V5.pdf Since all LEDs should ...
tomass's user avatar
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1 vote
1 answer
70 views

Over-current/short-circuit protection for the battery bank

I am using a 24 V 100 A additional vehicle alternator for charging my additional battery bank of 24 V. I need an over-current/short-circuit protection for my battery bank. I am considering using a DC ...
James Ross's user avatar
12 votes
5 answers
3k views

Is it recommended to set the current limit on a bench power supply by shorting it?

I have a Rapid 85-1901 switching mode 0-20V 0-5A bench power supply: Without a load attached the current shows 0A no matter how you turn the dial. After searching how to set the current limit online, ...
Danny Beckett's user avatar
2 votes
3 answers
410 views

Powering a 3 V motor with 2xAA batteries for several hours

I have a 3 V toy motor that I want to run with some kind of stability using 2x AA batteries. In terms of load, imagine a little fan. I'm not sure how much torque that would add. The motor is a brushed ...
rcot's user avatar
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1 vote
2 answers
113 views

Simple model of limiting the current through a circuit

I am trying to simulate the circuit below where I have a behavioral current source whose job is to limit the current to 1m if the current in the circuit exceeds 1m. However, the circuit below doesn't ...
Leonhard Euler's user avatar
0 votes
1 answer
198 views

BTS7960 current limit [closed]

I want to ask about current limit at BTS7960. I'm not clearly understand when read the bts7960 datasheet. I have using 24 V 20A power supply connect to BTS7960 then connect to 24 V 14 A DC motor. When ...
saiful's user avatar
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0 votes
1 answer
103 views

Constant current near to maximum load current

Following on from my last question where I asked about dual purposing a PFET used for reverse polarity prevention for current limiting to a load (spoiler, that doesn't work for my application), I have ...
learnvst's user avatar
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3 votes
2 answers
113 views

Using PFET to modulate power to load

A typical PFET reverse polarity detection circuit looks like this I was wondering if it is possible to use that same PFET to choke some power off to the load by adding a voltage divider using ...
learnvst's user avatar
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0 votes
1 answer
70 views

50 watt high-power LED current problem [duplicate]

I am using this 50 watt high power LED: . And want to power it using this voltage booster: From 12 V to 34 V as the requirements of the LED datasheet. Will it work? I read that I need to limit the ...
Mohamed Essam's user avatar
0 votes
0 answers
46 views

Sensored Brushless DC Motor Back EMF Problem

I am working on the current control of a BLDC motor with a speed of 12000rpm. The current controller in the system is designed as PI. I give a reference value of 10A to control the motor and the ...
G. G's user avatar
  • 1
0 votes
1 answer
77 views

How can I charge EV battery with large plate and detect shorts

This is a general question but specific example. I want to charge a hoverboard-based robot using a 'docking' station. But I don't know how those know to only send current if the robot and nothing but ...
AwokeKnowing's user avatar
0 votes
1 answer
41 views

Reducing current for 5x5 IR transmitter matrix

I'm currently working on a project that involves a 25 IR transmitter matrix, with each individual IR transmitter requiring around 50mA of current. This results in a total current requirement of ...
Krishna Bansal's user avatar
1 vote
4 answers
98 views

Equipment to throttle energy consumption of 220V AC device (Solar+grid)

(This is my first post in this community, hoping it's the right place) I'm looking for a simple way to prevent a 2kW house water heater to draw too much current at once. Mostly because solar power ...
PPC's user avatar
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