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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BQ297xy Overcurrent protection

Can someone explaine to me how dose this overcurrent protection works and how to calculate it? BQ297xy Schematics
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42 views

How do I adjust the current on this constant current board?

I bought this little thing. It gives a current of 17mA and i want it to supply a current of 1.5A to 2A. I noticed there is this current adjustment thingy. I have no idea what it is or how it operates, ...
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Current limiter low voltage drop

I'm trying to understand the function of the constant current regulator CCR and the zener diode 1N5338. I do have more questions but these two components is probably a good start. I understand that a ...
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53 views

How to incorporate voltage controlled current limitation

This is part of a lab PSU and programmable load, for generic lab use including e.g. battery charging/discharging. This question is about the desgin of the current limiter in the psu part. It must be ...
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60 views

Transformer open circuit output voltage and current limiting resistor at gate of Triac

Im kinda new to electronics and have some questions before i solder my projekt together. I want to make an Arduino controlled soldering iron and designed the circuit below. The optocoupler i used is a ...
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56 views

Using a depletion mode mosfet as a current limiting device

I have recently discovered the exciting world of depletion mode mosfets. Curiously, even in this document, I found nowhere that a depletion mode mosfet could be used as a current limiting/inrush ...
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72 views

LM317 using 2N2222 as current limit

I am trying to build a current limiting circuit using LM317. The goal is to limit output current to ~150mA with 25V input and output at >20V. I built the circuit according to ST datasheet, using the ...
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95 views

Do I have to use current limiting resistor for LED in this configuration?

LM741 datasheet says that it can output a maximum of 20-25 mA. So in this case, is that R5 a must, or will it be safe not using it? Assuming LEDs can withstand 25mA.
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137 views

Limiting output current of a Buck Converter

I am trying to power a 4S-ESC to drive a BLDC motor using a buck converter and 24V,10A SMPS. However, my buck converter can only handle 10 Amps of current (safely) at 15V through its output side. ...
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How to calculate the maximum current that a wire can handle? [duplicate]

What are the methods that manufactures used to do so ? What is the formula used if there is a one to do so?
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49 views

Implementation of Adjustable Current Limiting Circuit

I have a circuit that can deliver 0-10V and 0-100mA to a load, and want to have an adjustable current limit that will limit the current delivered. To do this I have a current shunt that I monitor, and ...
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61 views

LED current source safety margin

I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts ...
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87 views

Creating High current DC Power supply [closed]

I have the following resources: Input - 24 V 80 Ah DC Battery (Car Battery) Output, what i want: 12V DC with <2 Amp for driving some of the sensors. 5V DC with <2 Amp for driving micro ...
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Op-Amps in custom current limiter acting strangely

I'm building a small current limiter (~20 mA). It's important that there is little drop over the current limiter and that the load receives almost the full supply voltage when it's pulling less than ...
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68 views

Amperage limiter?

I'm looking for a component that essentially limits the current passing through it, but unlike a resistor, its resistance is not constant. When the current passing through this component is below the ...
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49 views

Zynq-7000 SoC Power-on current limit

I'm designing the power supply line and voltage regulator for a Xilinx Zynq 7000 SoC and I'm not sure how to consider the specification from datasheet concerning the minimum and maximum current to be ...
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65 views

using current limiting diodes instead of resistors

Most 3d printers have stepper motors that are rated for maybe 2-3 volts, but are usually driven at much higher voltage like 12 or 24 volts. It's possible since the motor drivers are current limiting - ...
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60 views

Transistor Limit Current

I am using a LM395T transistor for an inductive load (a motor). The voltage limit is well within the 36V threshold. But current isn't limited. The specs of the transistor say that 1.5 A is maximum. ...
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105 views

How to protect an op-amp against high inrush current following a high input voltage pulse?

I have a circuit where I'm amplifying the output of a piezo transducer with an op-amp. By taking some readings, i've found that the piezo can output fairly high voltages when struck hard (~20V), and ...
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current limiter after a voltage divider for op amp input

I am doing a two-stages amplifier for a very small signal (-+300uV), coming from a radar sensor. The following two images are taken from application notes. I know R2 and R3 are voltage divider. 2.5V ...
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88 views

SMPS feedback circuit with voltage regulation and current limiting

i’m self learning electronics for a few months now and i choose my first project to be a bench SMPS. Since it is my first circuit design ever i really need some clarification. My SMPS is 2-switch ...
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83 views

Limiting logic gates input current with serial resistors reading their electrical characteristics

My application, shown in the diagram below, will have 12V/GND control lines that will arrive at the gate input pins as 'high' state or 'low' state. Datasheets has two values for input current: 10mA (...
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105 views

Very confused regarding parallel resistors limiting current

I'm an electronics noob trying to understand this Arduino circuit below. Having very cursory knowledge of electronics, I'm extremely confused by this statement I took from the Arduino Knock example: ...
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2answers
56 views

How to precisely cap current

I'm building a device that drives a motor shaft with the possibility of injury or discomfort if the motor receives too much current. The motor will be driven at 48V with max current around 5.2A. It ...
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4answers
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Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
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60 views

Is it possible to control a PWM computer fan with a resistor? If yes, how? [closed]

I have a video card that is loud while idle, because the fan curve appears to be set rather aggressively. Unfortunately, this can not be changed via software. The fan is connected with a regular 4-...
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1answer
89 views

Capacitive load - Circuit protection

I have a circuit which drives capacitve loads (they vary from around 800pf to 1600pf) and because of circumanstances like air polution and dust it can come to electrical contact to the surroundings or ...
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1answer
139 views

What capacitor needs to be used for a circuit that limits the current?

I have the following circuit that is intended to limit the current that passes through diode D1 In this case, we can see on the graph that the current is limited at 5.31mA We can see on the graph ...
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87 views

Do I need to limit the current on the inputs of a parallel load shift register?

I have a Parallel Load Shift register (SN74HC165) When connecting the parallel inputs, do I need to add a resistor to limit the current? And if so, can I use one resistor for all 8 Inputs in total? ...
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405 views

How to calculate current limiter resistors for ULN2803 and Relay?

I'm designing a digital I/O, and for the outputs I have ULN2803 and relays. I have the schematic below. The coil current of relay is 16.7mA, ULN2803's max input current is 1.35mA and output current ...
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28 views

CD4543B Direct LED Driving Capability

I bought some 7 segment decoders specifically the CD4543B and the datasheet https://www.ti.com/lit/ds/symlink/cd4543b.pdf mentions "Direct LED Driving Capability" Does that mean I do not have to use ...
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1answer
133 views

Low voltage drop current limiter for charging supercaps with a MOSFET

I have an RPi that I want to give enough juice to auto shutdown when the power goes down. For this I'll use 2 supercaps of 6F (2.7V) in series, giving me plenty of time. Now, I was wondering if I ...
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150 views

How to limit current while almost keeping voltage same

I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
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98 views

Resistance issue in a triac-optocoupler switch

I have made the following circuit to control my water pump with Arduino(UNO R3). I have tried many resistors (calculated myself) to limit current in the optocoupler and triac, but failed to carry the ...
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51 views

How to work around odd LED strip current limiting?

I’m a theatre lighting technician (and electronics hobbyist), working on a project involving SK6812 RGBW addressable LED strips & strings. They use an 800kHz single-wire control signal, ...
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2answers
159 views

TL494/TL594 measure current with grounded load

Multiple examples of current limiting with TL494/TL594 suggest to use current sensing resistor between load(-) and GND. But I want load to be grounded. Can current sense resistor be placed above load(+...
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1answer
83 views

Can I Use a Transformer to feed a Mains current to a RPI GPIO pin

I have a standard mains (240v) motion detector that activates an outdoors lamp. I want to notify my Raspberry Pi when the lamp is activated. My plan is to use a 240v to 3.3v transformer that I have ...
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381 views

How to limit current using voltage regulator

I have a cheap little generic voltage regulator board which should allow me to select both the output voltage and the maximum output current, but I can't get it to limit the current properly. The ...
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50 views

Current limiter doesn't work

I've built simple current source with current limiter. Regulated part of the circuit is supplied by 10V from Lab Power Supply in which I set also current limit to some value. Idea is that U1 pushes ...
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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 ...
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1answer
80 views

Combining non-isolated switch mode power supplies in parallel into a single supply

I'm trying to combine several SMPSs each having a ~350VDC output @100mA each. Background: Purchased an unused batch of small DC->DC SMPSs in good industrial quality. Unfortunately they're too weak ...
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72 views

LM317 Constant Current vs Transistor Current Limiter

LM317 with Current Limiter configuration: Current limiter circuit with transistors: I am used to drive LEDs in my PCBs with LM317. However I recently came across this circuit which will cost less. ...
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44 views

Mountain Bike Light Bar 18650 battery pack

I have a 6 Inch LED Spot Mini Bar Light which is used for vehicles, it uses 12-24 V and is rated at 18 W of power. I have some 18650 batteries which would work perfectly for this project. What would ...
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2answers
315 views

Understanding DALI power supply

I am working on a DALI system and I came across this schematic for the DALI power supply in a Microchip app note AN1465: It says the power line can be 12-20 Volts but the current has to be limited to ...
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74 views

Trying to come up with a overvoltage overcurrent reverse polarity protection circuit, is option 3 done right?

I´m reading for the past week about P-Channel mosfet reverse polarity protection circuits. Then I´ve found this post http://kaktuscircuits.blogspot.com/2014/07/reverse-polarity-and-overvoltage.html ...
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75 views

Limiting current draw from a power supply

I have a power supply that can supply around -60 kV DC and 10 mA. This power supply provides energy to a device known as a fusor. A fusor utilizes a low current and a high voltage to ionize a gas and ...
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97 views

How to safely limit current for DC12v 30a?

I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps. The power supply I'm going to order is, you guessed it, 12V 30A. I've calculated the ...
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73 views

How does voltage/current limits work in switches?

I want to get a rotary switch, it says that it can handle 600 V and 40 A. I will use it to turn ON two DC brushed motors of 12 V 20 A. So, the voltage is way too high but the current is just right. ...
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3answers
83 views

Copper wire current ratings [duplicate]

I have seen a wide variety of different estimates for the maximum current rating for copper wire. For example, for 24-gauge copper wire, the Wikipedia article about "American wire gauge" claims that ...
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2answers
40 views

Reducing current in a circuit without reducing voltage [duplicate]

I didn't find a solution in the other similar posts or maybe I don't understand them. Here is my problem : I've got power supply with an output of 5V and 8A to feed 128 leds drawing 5V and 50mA each. ...