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Questions tagged [over-voltage-protection]

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1answer
38 views

LED current source circuit design concerns

TL;DR: Read the bulleted list below. I am designing a simple constant current source to power up some LEDs inside arcade buttons. My project consists of 20 of these buttons. Every button is ...
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1answer
45 views

Crowbar Circuit for 35V OVP - What parts should I use?

Please excuse my confusion, because I really don't understand what the "150mA max continuous cathode current" means on the datasheet for the LM431. I'm also not sure it'll work in the crowbar circuit ...
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1answer
82 views

LTC4366 killing MOSFETs

I designed a circuit around LTC4366 as per the picture below. However numerous MOSFETs have been damaged and become useless. Mosfets used : STH12N120K5-2; IXFT50N85XVH; STW13NK100Z - All are rated to ...
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0answers
32 views

Techniques for accurate 5.5 Vdc active voltage clamp

We are currently using TI ISOW7841 Digital Isolation modules /w built-in isolated 5 Vdc DC-DC converter Datasheet. We are having rare failures. Failure shows up as the module running much hotter ...
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1answer
36 views

SMPS Over Voltage Protection

I have some related questions here and I hope I get better understanding thru this forum. ATX SMPS has Over Voltage Protection. Does it mean that it will shut itself down in over voltage situation or ...
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1answer
58 views

high power - overvoltage protection

I am designing a circuit to protect a load from over-voltage. The voltage at the load must be around 380VDC and the current consumption will be around 2A. In normal operation the Power Supply must ...
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1answer
40 views

Reverse polarity protection for symmetrical input

I have a symmetrical voltage input I need to protect agains reverse polarity, and over-voltage. Here is the reverse polarity protection I designed. Is it correct ? I can't find much information about ...
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1answer
51 views

Short-circuit protection, reverse polarity automotive

I am designing a power circuit and would like to integrate the ic VN5160S to protect it, but I have doubts about the position of it. Would the ic VN5160S be before the DC / DC converter in my circuit? ...
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1answer
22 views

ESD/overvoltage protection with DM1231-02SO TVS array

I'm protecting a USB2.0 IC against ESD and overvoltage at the USB connector using a Diodes Incorporated DM1231-02SO TVS (dual) array. The datasheet labels the pins IN and OUT, but it's not 100% clear ...
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1answer
60 views

Transistor Reverse Biasing - AC

I am working on a project which require to activate a 24V Rated relay using a 3.3V rated IO. To provide adequate isolation I have added a Opto-isolater stage. In order to increase the current output ...
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0answers
33 views

Gate behaviour on triggered SCR

I'm having trouble understanding this crowbar circuit, which I'm trying to implement as an overvoltage protection for a 5V linear power supply. V1 simulates the regulator's output while V2 is the ...
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1answer
87 views

Overvoltage protection for AC relay dilemma

I am currently designing a safety-related device that has to open a relay when a certain event occurs. During most of its life, this relay will be closed, and only open if the safety event occurs, ...
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1answer
115 views

What the function of zener diode on this picture

I am confuse, why we need clamping with zener diode because it doesnt matter when vgs goee below zero, cmiiw
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2answers
1k views

Long wires causing Raspberry Pi to die?

I've been working on a simple project involving a Raspberry pi and some switches. I would never thought I would have any problem for something as simple as a switch, but here I am. The 2 wires from ...
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1answer
37 views

Protecting 0..10 Vdc PLC input from voltage divider failures

I'm working on an off-grid PLC based battery bank monitor and dump load controller to replace commercial units that don't work really well with our lithium ion battery bank. In addition, I plan to ...
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3answers
115 views

How long do I have before my sensitive components get fried?

I'm using this IC (https://www2.mouser.com/datasheet/2/609/ADM1270-878589.pdf) to control the current and the voltage on some of the outputs of a PCB that controls the power to other PCBs, which have ...
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2answers
186 views

Simple reverse and overvoltage protection circuit for drive a fan

What is the simplest/minimal circuit or component i can use to drive and protect a fan from overvoltage and reverse polarity? A mosfet per fan seens a option for reverse polarity, still if there's a ...
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1answer
48 views

How can I tell whether a DC device will accept a greater voltage than stated? [closed]

Over the time, as an amateur, I've developed a sense that DC powered devices with internal circuitry should be fed with the voltage stated on the case. Having seen certain devices (e.g a portable USB ...
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1answer
46 views

Connector pins protection from overvoltage

I have a connector which has the following lines: 12V 3.3V GND SDA (I2C) SCL (I2C) The connector might get wet with water and I would like to protect the circuit from the resulting over-voltage in ...
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1answer
132 views

What is Metal Oxide Varistor (MOV), meaning of its specification and how it protects circuit from over-voltages?

Hello, I have a circuit in which a voltage source is connected to some sort of RC Load. To protect this circuit , there is an Metal Oxide Varistor (MYN15-681K). The Pics of circuit and datasheet ...
2
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1answer
79 views

Schematic for input protection with NMOS? Does this really work?

I was reading an old schematic and found this and sketched it up; (see box in image "Some kind of protection") The closest thing to this schematic that I've been able to find, that could have briefly ...
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1answer
47 views

Historical: I am trying to get a handle on when output voltage was used to protect from faulty LEDs

I am interested in when a simple over voltage detector was first used to protect LED arrays from damage caused by one faulty unit. I have a reference from 1999 but am sure I saw something first ...
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1answer
146 views

Slow-blow fuse equivalent for overvoltage?

Working on an compact electronic ballast design (~5 W load), I see the need for an over-voltage protection circuit that has a 'slow-blow' characteristic. When a lamp is turned on, a striking voltage ...
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2answers
152 views

3.3V overvoltage limiter circuit topology

I need to design, using discrete components only, a shunt voltage limiter that drains little or no current (less than 2mA, the lower is better) at 3.3V, and ensure that, when driven at more than 4V, ...
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2answers
373 views

Supercapacitors in series

Can I charge series of 4 Maxwell BCAP3000 supercapacitors with constant current method using an adjustable Power Supply, and exceed the voltage rated for single cell? What I mean is to charge the ...
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1answer
90 views

Limit MPPT solar charger output voltage

I have a problem with my mppt solar voltage regulator. I have a campervan with three 320 W solar panels (Voc 40.8 V, Vmpp 33.3 V) connected in series on the roof, and two 260 Ah, 12 V AGM batteries ...
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1answer
82 views

Simple Power Sink Circuit

I've got a test bench for brushless DC motors, which is supplied with a regulated power supply unit. The motor itself is driven by an electronic speed control (ESC), which feeds energy back to the ...
3
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1answer
215 views

Dimensioning SCR crowbar circuit

I need to dimension an SCR crowbar circuit to reach a certain level of protection against overvoltage, without increasing much the complexity of the circuit of my control card. The need is to protect ...
0
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1answer
269 views

12V 12A resettable crowbar circuit

The idea is to protect the input stage of a control card from improper power supply connection. The power supply is a standard desktop AC-DC power adapter (Meanwell GST160A12) with inbuilt shortcut, ...
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3answers
121 views

Protection diodes for Arduino pin passing current to +5V rail when powered down - what to do?

simulate this circuit – Schematic created using CircuitLab In the circuit above, I'm using a resistor (R1) and a couple of protection diodes (D3 and D4) to keep the voltage on an Arduino pin ...
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1answer
93 views

Push-pull amplifier

The question is concerned the output current of push-pull amplifier once the over-current protection is activated. The resistor Rs(one between base and emitter of the over-current protection ...
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2answers
127 views

Protecting 0 to 5V Arduino pins from +/- 10V oscillating input

Background: I want to connect a Eurorack Synthesizer Low-Frequency Oscillator, which can range from -10V to 10V, to an Arduino pin which can only accept 0V to 5V. I don't mind if the negative ...
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1answer
75 views

Converting 6c (3s2p,4.5v) DC motor to 1s4p 18650 charging/protection

Having a hard time figuring this one out, I am trying to convert a 4.5v 25w dc fan from an air mattress pump to run off a rechargeable battery pack made with 18650's. This is going to be charged and ...
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2answers
198 views

Protecting microcontroller digital output pin from ESD, reverse connection, and other possible user error

I want to protect an output pin from ESD, reverse connection, and other possible user error that might cause damages to my circuit. This pin output pulses depend on the amount of water passing through ...
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1answer
101 views

How can the overvoltage prodection inhibit the voltage to let the voltage doesn't reach the destrutive level?

This is the voltage conditioning schematic,including OVP(overvoltage prodection) and LDO(low drop-out regulator),the OVP limits \$V_{buck}\$ to inhibit it reaching destrutive voltage level. When \$V_{...
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1answer
45 views

Protecting reset pin from overvoltage

I'm designing a board with a control port. The control port allows an external controller to reboot the system by pulling the BRD_RESET low, effectively restarting ...
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0answers
25 views

Protection circuit for applying external voltages at the output of live isolated DC-DC converter

I am designing a tester for 15v power supplies (based on isolated converters). I have to test whether the supply turns itself off or not under fault condition (under voltage and over voltage). Since, ...
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3answers
183 views

History of ESD protection

These days you can't read anything about electronics without hearing about the dire consequences of omitting ESD protection from your designs. It seems this wasn't always the case. If you look at ...
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2answers
207 views

overshoot and undershoot on 3 volt pulse

i am interfacing a system, this system output signal of 200ns digital pulse with repetition time of every 3ms. Ideal voltage of signal would be 0v to 3.3V but signal coming from system have high ...
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2answers
416 views

Overvoltage protection circuit

I have a PCB with 3 inputs: Ground 5V (logic IC power supply) User-selectable 5V or 12V (motor power supply) There are two types of motors, 5V and 12V. If the user selects the wrong DIP switch up-...
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2answers
130 views

Non-resettable zener/polyfuse for overvoltage protection

My setup is two DC-DC converters (hobby BECs) supplies, one acting as a backup for the other. A relay, powered by the primary BEC will automatically switch to the secondary BEC if the output from the ...
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1answer
99 views

Additional overvoltage protection after RBO 40-40 with Zener diode

I have an automotive application where I have this: simulate this circuit – Schematic created using CircuitLab Would the 20V 1W or 5W zener diode be enough together with a typical automotive ...
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0answers
152 views

What to use instead of 1k1 Ohm PTC thermistor?

I've got uni-t ut60a damaged. IC was replaced. Two tracks were repaired. The PTC thermistor of 1k1 Ohm is left. Unfortunately it is not easily available, in fact I couldn't find any of these being ...
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1answer
271 views

Increasing Overdischarge Protection Voltage in DW01A

I am working on a academic project which requires TP4056 along with battery protection circuit (DW01A). The ciruit uses a 1S LiPo 500mAh battery. I want to keep the Overdischarge Protection ...
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1answer
75 views

overvoltage protection on TI's reference design

I'm following TI's reference design (PMP11612) for a 5V 2A AC-DC adapter and was wondering if I would need to add overvoltage protection like a zener diode or a TVS diode on the input to this circuit? ...
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3answers
281 views

Burned out High Voltage Capacitor

Have a high voltage CAP (C4) that was put into a new design. Supposedly it was chosen with the old design parameters in mind. But since its inception it continued burning out. Should we attempt ...
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1answer
356 views

Reverse current from motor driver causes buck converter to shut down

I am using a TPS53319 (datasheet) buck converter to generate 5V 10A to supply H-bridge motor drivers and RC-servos. I am using this schematic which is based on the datasheet example and a TI Webbench ...
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1answer
281 views

TVS Diodes for Audio?

Usually audio inputs use protection diodes that shunt into the power supply rails of the device they're protecting. But is this really necessary? Why are TVS diodes not used here? Yes, some are high ...
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0answers
110 views

LT4363 High surge stopper shutdown at start up

I was asked to protect a DC/DC Buck converter against overvoltage and overcurrent event. During my research, I found the LT4363-2 component from Linear Technology that is defined as a High Voltage ...
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4answers
5k views

Using 12V fans with a 24V PSU

I have recently acquired a 3D printer and have been experiencing all kinds of trouble with the fans used to cool the printer head, the parts and the controller board. The controller is a smoothie-...