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Questions tagged [over-voltage-protection]

Additional internal or add-on parts to a fixed voltage regulator to prevent the output voltage from exceeding a preset limit if internal voltage regulation fails. Some OVP designs include an SCR to short the output and blow a fuse, rather than risk damage to downstream hardware.

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Issues with LT4363 Surge Stopper: Inrush Current, OV Pin, and Vout Behavior [closed]

I have been reading the high voltage surge stopper with current limiter datasheet (LT4363-2) and trying to understand it through simulation and testing on the actual board. Based on my understanding, ...
chami's user avatar
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-1 votes
1 answer
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Why too many MOVs used in surge protectors? [closed]

I got this photo only for reference, and have no idea about the circuit: but why in this surge protector too many MOVs are used, I mean normally the lowest impedance MOV would take the most surge ...
Hazardous Voltage's user avatar
6 votes
1 answer
563 views

Will this over-voltage protection circuit work?

I am designing a PCBA that is powered from an AC adapter supplying + 19 VDC to the circuit. I want to add a protection against over-voltage, let's say up until + 24 VDC. I came up with the following ...
uz3il's user avatar
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2 answers
69 views

ADC pin protection when using external power supply

I was playing with ADC on ESP32-C6 (devkit board) trying to read values from photoresistor (VT90N2) in voltage divider with another (10K) resistor. simulate this circuit – Schematic created ...
valeroso's user avatar
1 vote
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47 views

How to test Keychron K3 Pro PCB LEDs

After plugging Keychron K3 Pro keyboard to USB port on Tesmart KVM switch (used not original power adapter maybe it worked not stable), after 10 min of working keyboard and mouse unplugged and light ...
Lion's user avatar
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2 answers
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Overshoot in LC Circuit Exceeding TVS Diode Breakdown Voltage

I'm currently troubleshooting an issue with two circuits involving LC components and TVS diodes. Both circuits are designed to ensure the output voltage (Vout2 for the first circuit and Vout3 for the ...
Firas Abd El Gani's user avatar
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2 answers
79 views

Zener MOSFET Voltage Limiter

I need an input protection for a DC-DC converter in a 24V automotive system environment. The DC-DC is capable to accept 50V input but I need some sort of protection against load dump pulses which can ...
Emanuel's user avatar
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Easy Overvoltage and Reverse polarity protection circuit

I'm looking for the simplest and most effective way to add an overvoltage and reverse polarity protection network to a signal line connected to an MCU, the maximum allowable voltage at the MCU pin is ...
404's user avatar
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13 votes
6 answers
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I keep blowing up irrigation solenoids

I built my own Wi-Fi connected irrigation controller using an Arduino Nano and some mechanical relays. The Arduino is opto-isolated from the business end of the relays which switch 24 V AC on/off to ...
Jim M's user avatar
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0 answers
44 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
58 views

Purpose of this RSNUB

This image is from the schematic of an overvoltage protection regulator. https://www.analog.com/media/en/technical-documentation/eval-board-schematic/1018babcsch.pdf I'm trying to find out the ...
marcosbc's user avatar
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Ideas for protecting an sEMG system from external problems

I am designing a pcb to work as a human-machine interface. Here is the simplified schematic: The idea is to connect a custom sEMG acquisition system to esp32 and also a pcb to control vibrotactile ...
pedro ulhoa's user avatar
1 vote
1 answer
62 views

Input protection close to maximum voltage

I'm planning a CAN network based on the CANbed RP2040 where the boards will be connected via fairly long cables (1 to 5 metres) to a LiFePo4 battery as shown below: simulate this circuit – ...
DamienWontContributeToAITheft's user avatar
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0 answers
40 views

Plugable Varistor and Fuse Cartridge for easy and safe replacement

As I have concluded with some tests, by reading some posts and even asking a question on this forum, Varistors can get damaged with multiple or even just one cycle of use. They fail as a short, being ...
Dinis's user avatar
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What are the meaning of the simple directional arrow above the double arrows in this schematic?

Helo,, I would like to know what are the simple directional arrows above the double arrows in this schematic?.
Daniel Prieto López's user avatar
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Protecting negative power rail

I don't trust my power supply and want to protect my circuitry from over(under)-voltage, but cannot find a clear path of going forward with negative power rail. LDO which I use (LT3094) is rated for ...
Andrejs Cainikovs's user avatar
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1 answer
60 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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1 vote
2 answers
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How to protect a device from reverse polarity and over-voltage?

I am designing a device that will include a DC power jack. There is an external wall adapter that converts the 110-230 VAC from the mains to 20 VDC. Here is the schematic: I intend to use a standard ...
uz3il's user avatar
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0 votes
2 answers
109 views

Surge Voltage Protection

I am currently working on designing a protection circuit for mains power. However, as a hobbyist rather than an expert, I am seeking assistance with this circuit. During my research, I came across an ...
M-125's user avatar
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0 votes
1 answer
96 views

Simple overvoltage protection circuit (LED indicator modification)

I saw this overvoltage protection circuit from theoryCIRCUIT. I was wondering if instead the LED indicating that voltage continues to flow, we could instead make the LED turn on when overvoltage ...
HuracanWind's user avatar
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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
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350 V overvoltage and overvoltage transients protection

The robot I'm working on has some some components rate either 360 V or 370 V max (no explicit never exceed values), with nominal voltages of 320 V. The robot is powered through a very long cable (with ...
Sandro's user avatar
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4 votes
1 answer
113 views

How do modern cheap multimeters survive a massive range of voltages?

I bought a little, rubbish multimeter for $2. If I set the voltage range to 200 millivolt, then stick the probes into a mains socket, all I'll see is "1" on the display indicating ...
SF.'s user avatar
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2 answers
81 views

Understanding reference levels in circuits

I understand that a zener diode uses its anode as a reference to limit the over-voltage levels that appear on its cathode. However, in the circuit shown below, I am confused about why the anode of the ...
Momobear's user avatar
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Is it possible to design an over/under AC voltage protection circuit using only diodes and SCRs?

Is it possible to design a circuit using only SCRs and diodes (Zener or otherwise) as a main regulating device to protect a load (220 V, 80 W) from over- and undervoltage? Other passive components (...
Yeal Takian's user avatar
0 votes
1 answer
79 views

Negative Voltage Cutoff

How do I turn off a negative voltage supply using a Zener diode as well as transistors and resistors? Let's say I have -30V supply, but I wanted it to turn off at -15V (using the zener voltage as a ...
HuracanWind's user avatar
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54 views

High negative voltage cut-off for op-amp from dual-rail power supply

In the picture I have a circuit that prevents reverse polarity and cuts the voltage with respect to the Zener diode (15 V) as a voltage reference for positive voltage output. How do I apply the same ...
HuracanWind's user avatar
3 votes
1 answer
75 views

Using Zener diodes to limit the max RPM of wind turbine

A windmill produces AC voltage, with increasing voltage as the turbine spins faster. If you know the max safe RPM, you could find the associated max safe voltage (V_safe). Additionally, when the leads ...
kevinbuiied's user avatar
1 vote
1 answer
45 views

High-Side Protection IC: what is the Vgs when IC is disabled?

I want to use the LM5060 High-Side Protection IC, where you can add an external N-channel enhancement type MOSFET to turn it on/off. I will bias it with 36 V that I need for my PCB. I try to ...
Christianidis Vasilis's user avatar
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42 views

1S Li-Ion BMS Design

I want to use AP6633 Protection IC along with MCP73833 Charging IC for 1S Lithium-Ion Battery. The issue is pinout of AP6633. I really dont have any idea how to connect AP6633 Pins to MCP73833, More ...
Zunuran Nasrullah's user avatar
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1 answer
152 views

Differences between a constant voltage "LED power supply" and a "standard" power supply

I'm looking for some input on a power supply problem... I'm using a Mean Well LPV-60-36 power supply (output of 60 watts @ 36 volts, rated for 1.67A RMS) to power a DM542T stepper motor driver that's ...
Scott Duckworth's user avatar
2 votes
1 answer
129 views

How to avoid transient voltage spikes when powering up a device?

I'm using the linear regulator LP2985-50 from TI to power a set of op amps (NE5532). The op amps provide an analog signal to a component that is very sensitive to overvoltages. Upon power up, I first ...
oscar garcia's user avatar
3 votes
1 answer
452 views

Am I correct that this digital IO protection diode choice doesn't make sense?

I'm currently redesigning a breakout board for an expensive FPGA data acquisition device we work with frequently. The designer of the past version added some components between the FPGA's digital IO (...
Brionius's user avatar
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3 votes
2 answers
399 views

What is the best way to mitigate the spark when a PCB is connected to power?

I'm designing a moderately powerful motor controller (integrated into a product). The board runs on 24V and has a 100uF electrolytic input cap, as well as 2 10uF ceramics near the switcher. Whenever I ...
Drew's user avatar
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0 votes
0 answers
110 views

Overvoltage protection for ESP32 (3v3)

I am trying to desing a switching regulator power supply for esp32 s3 (3v3). this is my schematic, I am using PAM2310 for switch regulator. I have tested it works fine. But sometimes I am thinking, ...
mehmet's user avatar
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12 votes
10 answers
6k views

How can I handle regenerative braking when the lithium-ion battery is full?

Long version We are using third party motor driver with regenerative braking and a lithium-ion battery. Apparently, this combination is well known in e-bike enthusiasts world as having a huge problem ...
Maple's user avatar
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0 votes
2 answers
328 views

Zener diode for overvoltage protection and earthing

I am designing a small circuit where the goal is to measure the current. The CT measures the current, which passes through a shunt resistor. The ADC convert the signal so it can be further processed. ...
cobdmg's user avatar
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0 votes
0 answers
34 views

How Siemens 7SJ80 over current protection relay can trip a circuit breaker remotelly installed

I wanted to know about the Siemens 7SJ80 protection relay which is installed in a transformer station on the middle-voltage line. How can I trip a circuit breaker installed between a solar generation ...
Smrtngy's user avatar
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0 votes
2 answers
203 views

Over voltage and backflow protection

I'm drawing up a MCU based device for my bike to control light etc. The power comes from the dynamo, and at higher speeds it will produce a lot more voltage than the circuit can handle, so protection ...
MiNiMe's user avatar
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1 vote
3 answers
662 views

How to protect MOSFET driver from gate over voltage

Below is part of my circuit. The problem I'm facing is my transistor fails a bit too often, mostly due to my stupidity but also in my learning experience. I have a bunch of transistors which I got for ...
php_nub_qq's user avatar
0 votes
1 answer
68 views

Need help to identify this chip

The input and output are both 3.3V so I think it may be a over voltage chip but I could not find the relevance chip.
ngavn's user avatar
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9 votes
3 answers
3k views

Why am I destroying MOSFETs in this overvoltage protection circuit?

I am designing a pro audio-video product that runs from a nominal 24 V 5 A off-the-shelf computer "brick" that has worldwide certifications. My customer has very little tech savvy, so I want ...
Brian Dotson's user avatar
0 votes
0 answers
75 views

Over voltage protection for 5v differential line

I am working on a stepper motor driver that will use 48V as a power source, this driver will have encoder interface. The encoder has 3 differential lines which will only tolerate 5V. I want to protect ...
Muhammad Nour's user avatar
1 vote
0 answers
64 views

RC Snubber Design Hint for 3 phase AC-AC PWM Chopper

Im trying to design a 3 phase Ac-Ac Pwm Chopper, I'm having difficulty designing the snubber network for the mentioned topology. Now I tried testing this circuit on bench , with my IGBT snubber values ...
Owais Ahmed's user avatar
0 votes
0 answers
87 views

DS3231 module li-ion charging circuit tweak

Most of the DS3231 modules come with a "charging" circuit for a LIR2032 battery. I understand that, as-is, it's considered garbage. The reason people say not to use the module as-is is due ...
Mike Anderson's user avatar
1 vote
0 answers
77 views

Protection of the power supply input from high voltage pulses

I am assembling a power supply for xenon arc lamps. I use a simple welding inverter as a stable current source. I use the presented scheme. The ignition circuit generates pulses up to 25-30 kV for a ...
Typeof undefined's user avatar
4 votes
3 answers
1k views

Overvoltage protection with ultra low leakage current for 3.3 V [duplicate]

I am in search of a method to implement voltage clamping or overvoltage protection for a sense line operating at 3.3V, with an ultra-low leakage current of ideally less than 1 nA. If achieving less ...
Olgidos's user avatar
  • 175
-1 votes
1 answer
493 views

Problems with MOV (Metal Oxide Varistor) simulation in LTspice

I recently ask a question relating this topic because I was having problems with the spice models supplied by the manufacturers wich consists of a logarithmic power law: The problem was of the type &...
Santi Ospina's user avatar
2 votes
1 answer
206 views

Sampling 24V one wire serial with a voltage divider?

I would like to sample 24V one wire serial with a voltage divider, wouldn't grounding the resistors in series potentially affect the data being transmitted? I was considering using an optocoupler but ...
Bob R's user avatar
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3 votes
2 answers
278 views

Protecting op amp from high voltages with leakage <= 1 nA

I need to protect a op amp of a TIA from too high voltages/currents From its datasheet, the LMP7721 support a maximum differential VIN Differential of –0.3 - 0.3 V. I cant use general diodes, due to ...
Olgidos's user avatar
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