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Questions tagged [over-current]

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Load is switching between 0V and overcurrent in the pulsed drain biasing circuit for a Power Amplifier

Given below is a block diagram of an evaluation-board. It is a pulsed biasing board to a PA. It is designed to produce a pulsed-drain and pulsed-gate signal for the biasing of GaN Power Amplifiers. I ...
Sahasra Vaiishnavi's user avatar
1 vote
1 answer
77 views

Modelling a Desaturation detection circuit on LtSPICE

I am trying to model a gate driver desaturation detection mechanism with discrete elements on LTSpice. The waveforms I have obtained now provide a constant Vdesat of about 5.6V when MOSFET is turned ...
Agniva's user avatar
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0 answers
82 views

Recoverable overcurrent protection of MOSFET using eFuse

I am looking into a way to improve over-current protection of an industrial device with switching contact output (based on PMV37ENEA MOSFET) that is rated for 1A / 30VDC load. The PMV37ENEA is ...
rostokus's user avatar
3 votes
2 answers
195 views

Overcurrent LED in LM338 circuit

I have an LM338 set up in current regulation mode, and I want to make an LED turn on when the current is maxed out (4A in this case) Where do I put this LED, and what other circuitry do I need? Is it ...
Klumpy7's user avatar
  • 392
0 votes
1 answer
56 views

Appropriate Overcurrent, Overvoltage, and Reverse Polarity Protection Circuit for Raspberry Pi 4?

I'm new to electronics but I'm trying to power a Raspberry Pi 4 (model b) using an external power supply for testing purposes[5V @ 3A]. This is possible via the GPIO, using pin 2 and pin 6 as ground ...
MG404's user avatar
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2 votes
1 answer
88 views

Why do my boards shut off when I connect an RJ45 cable to a switch but not a router?

I made a custom single board computer based on the Allwinner V3s. This system on chip has an integrated PHY. All components seems to work except I noticed that when I plug the ethernet cable to a ...
Varech's user avatar
  • 305
2 votes
2 answers
107 views

How does this part of push-pull converter work?

I took apart a power supply unit of some old kitchen lamp, and inside was this push-pull converter. It has an "optional" part, shown at the bottom of the schematic, which is not actually ...
Борат Сагдиев's user avatar
0 votes
0 answers
30 views

Reverse polarity, over-voltage and over-current protection for a "breadboard add-on board"

I am designing a small utility board that should attach to a breadboard and take power from it. It can be described as the opposite of this SparkFun Breadboard Power Supply: instead of powering the ...
tpimh's user avatar
  • 513
0 votes
3 answers
84 views

Concerns about Exceeding Current Rating on SN74HC595N to drive LEDs

I am currently working on a project where I am utilizing SN74HC595N shift registers to drive multiple LEDs. According to the datasheet, the maximum output per pin is specified as 35 mA, with a maximum ...
HydroPage's user avatar
0 votes
0 answers
47 views

Optocouplers for comparator as current detector

I'm working on the realization of overcurrent detection that will be powered by a battery supply. I successfully simulated a comparator with an operational amplifier that will set the output high when ...
Simplifier's user avatar
1 vote
1 answer
139 views

Flip-flop logic for comparator of overcurrent detection

I'm working on the realization of overcurrent detection that will be powered by a battery supply. I successfully simulated a comparator with an operational amplifier that will set the output high when ...
Simplifier's user avatar
0 votes
2 answers
86 views

Comparator as a current detector with shunt resistor v2

I have a comparator with a shunt resistor that measures the voltage and when the voltage of 12 V from the source exceeds the Vref (1 V in my case) it switches to "high" output. I would like ...
Simplifier's user avatar
0 votes
1 answer
160 views

Comparator as a current detector with shunt resistor

I would like to design in OrCAD a comparator with a shunt resistor that will measure the voltage and when the voltage value is exceeded it will flip. I have designed the comparator but I don't know ...
Simplifier's user avatar
0 votes
1 answer
41 views

Rating of circuit breaker for protection

This circuit breaker is rated as 12V-48V 100A and I have to use this circuit breaker between additional alternator (24V 100A) in my vehicle and additional battery bank to provide overcurrent/short ...
James Ross's user avatar
1 vote
3 answers
116 views

Latching comparator always starts at latching position

I build a over-current protection circuit using a latching comparator, below circuit diagram is the simplified version (without the current limit circuitry): simulate this circuit – Schematic ...
ElectronSurf's user avatar
  • 2,396
1 vote
1 answer
73 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
0 votes
1 answer
102 views

Implement adjustable overcurrent protection for DC current

I am designing a hobbyist's multi-fixed voltage channels using ATX PSU breakout. Of course the fixed voltages are 3.3V, 5V, 12V, and if possible, -12V too which are supported by ATX. Now I want to ...
slyx's user avatar
  • 221
1 vote
1 answer
329 views

Configuring Overcurrent Protection – ST Microelectronics Motor Control Workbench

I have been working on a custom electronic speed controller I designed and built partly based on a reference design from ST Microelectonics; the STEVAL-ESC001V1. My board uses the same MCU, a ...
mike's user avatar
  • 127
0 votes
0 answers
46 views

Connect LED to current limiter TPS259540 and control the current

I have an LED (ILH-ON01) with a forward current (IF) rating of 1 A. I want to operate this LED at a constant current of 1 A using a current limiter. The current limiter I have has a limit of 1.17 A ...
Knowledge's user avatar
  • 441
0 votes
1 answer
111 views

How and where to learn protective relaying for power systems?

I'm trying to learn protective relaying for power systems. More specifically, I want to learn how to calculate the settings that must be configured in the digital relays in order to build ANSI device ...
A.Bukhari's user avatar
1 vote
0 answers
178 views

Do power strips need to have a breaker?

In North America we commonly use power strips to connect equipment to the building. https://en.wikipedia.org/wiki/Power_strip I noticed that some power strips have a circuit breaker, and some do not. ...
BetterSense's user avatar
1 vote
0 answers
177 views

Super capacitor causing overcurrent protection

I'm making a power-supply circuit for some MCUs using a battery charging-discharging protect module MH-CD42 (both input and output is 5 V). The module's datasheet says it has a 0.3 seconds switch time ...
Object Unknown's user avatar
0 votes
2 answers
147 views

Circuit Protection: on-board vs off-board; manual vs auto. Which is better for our application?

RE: Circuit protection for small health & beauty product (for mass-production) similar to a foot spa whereby a portion of the user's body will come into direct contact with 1.5 gallons of water ...
tayglo's user avatar
  • 95
0 votes
0 answers
78 views

Understanding USB3.0 over-current detection circuit

I'm trying to understand how the following over-current protection circuit works: the way I understand this, as long as +VBUS_USB3_P0 = 5V and it's equal to +5V_ALW, there is no current current going ...
Firas Abd El Gani's user avatar
0 votes
4 answers
233 views

How can I protect a 12 V, 5 A circuit from high current due to short circuit condition?

How can I protect a 12 V, 5 A circuit against high current due to short circuit? I have tried resettable fuses but they do not work as expected. I have tried MF-USML300/12-2. In actual application (...
Rupak's user avatar
  • 3
5 votes
1 answer
439 views

Overcurrent protection (at 4A 100V)

On the PCB I'm designing, the total power consumption might be as high as 86W (including output power), with supply voltage between 18 and 75V DC (it is OK not to allow full output power bellow 22V). ...
Sandro's user avatar
  • 7,697
1 vote
0 answers
146 views

Non-triangular/Incorrect (non linear) inductor current waveform for half bridge buck converter

I have a buck converter (Half bridge) as shown in the schematic below. (48V output). V_D goes to an external inductor. I have measured the inductor current for different loads (Nominal(upto 4A), ...
Ishani Engineeŕ's user avatar
0 votes
0 answers
72 views

Automotive generator overcurrent protection

I am rebuilding the wiring harness for the engine of a 50+ years old car. There are a few things in the original design that I am planning to improve while at it. My main concern is part of the ...
Martin's user avatar
  • 1
0 votes
3 answers
57 views

Power supply circuits to supply specific voltage with current limitations

I have an old sensor that requires 200mA at 5v DC, but it does not have any overcurrent protections and will blow a capacitor if the current is too high. Is there some kind of current limiter circuit ...
guyguy46383758's user avatar
1 vote
1 answer
90 views

TC4056A shuts off at maximum volume (Bluetooth speaker)

I am trying to build a DIY Bluetooth speaker using a 18650 battery cell, a TC4056A battery charger board, an XY-016 that raises the voltage to 6.5 V, a 2200 μF capacitor, and a CSR8645 board. I am ...
Andrei-Eduard Lică's user avatar
2 votes
2 answers
1k views

Overcurrent/short circuit protection using an op-amp and a MOSFET

I wanted a circuit to limit the current to say 4 A, and found this, but it doesn't work in the Proteus simulator. What's wrong with this circuit? Are there any ways to improve it? Here is my ...
mahyar's user avatar
  • 21
1 vote
0 answers
418 views

Half-bridge driver IR2101 shorting high side and low side (In a weird condition)

I am making my own FOC BLDC driver, but there is a weird problem when I control the gate driver using PWM. I am using three IR2101 driver IC to drive the six N-FETs, and I am using an STM32 (Blue pill)...
Dennis Chang's user avatar
1 vote
1 answer
558 views

Linear power supply - overload protection circuit

Summary and context: Several years ago I bought a linear power supply from Pyramid, model PS-3KX. I would like to understand in detail how the overload protection really works, as said by Pyramid ...
EJE's user avatar
  • 1,589
0 votes
0 answers
48 views

protect from in rush current of buck convertor

I made a PCB base on the following schematic, it uses a buck convertor for 12 to 5 v and then uses an LDO for 5 to 3.3 to run my ESP module I use 2 P-channel MOSFET for polarity protection , but ...
Hamid s k's user avatar
  • 343
0 votes
3 answers
200 views

DC over current protection idea needed for step down converter input

I ride an electric motorcycle which is powered by a 26s 96V Li-ion battery. It has regen braking that charge the battery with 50A current. All the lights are powered by a 60v-120v to 12V 15A DC step ...
Roguenite's user avatar
2 votes
1 answer
74 views

18650 Li-ion cell protection tripping at super low currents (~1 mA)

I recently bought a 3.7 V lithium-ion cell to replace an old 3.6 V NiCd one in a handheld vacuum cleaner. I am aware that Li-ion cells don't handle current surges nearly as well as NiCds do, and for ...
ChemiCalChems's user avatar
-1 votes
2 answers
1k views

What will happen if I use RCBO where there is no neutral in the system?

I need some help. Could you please go through the scenario and try to answer my query below? This system is installed in a ship where there is no neutral connection available. A 440V/220V step-down ...
nid's user avatar
  • 1
0 votes
0 answers
274 views

Transformer secondary conductor protection: how do NEC 240.21(C) and NEC 240.4(B) make sense together?

NEC 240.21 says all ungrounded circuit conductors require overcurrent protection, with a list of exceptions: One of those exceptions is 240.21(C): 240.4(B) says that if you're under 800 amps, you ...
Stephen Collings's user avatar
0 votes
1 answer
257 views

USB hub IC overcurrent Pin: active LOW or active HIGH?

I am using USB2517 - USB 2.0 Hi-Speed 7-Port Hub Controller IC to make a USB 2.0 hub. What I do not understand (or its missing from the IC's datasheet), is Pins OCS[7:1]_N, which are "Input from ...
Christianidis Vasilis's user avatar