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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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, ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Protection of my loads (batteries + equipment) from alternator
I have an aftermarket additional alternator (24v, 100A) installed in vehicle without external regulator (don't know about internal regulator). I have found this alternator locally probably used ...
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Variable Resistance in LTspice- Convergence problems + understanding the solver
I've created a variable resitance model in LTspice to simulate the behavior of a Metal Oxide Varistor. The variable resistance is performed with a behavioral source aas follows:
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OZ960 Intelligent CCFL Inverter Controller - Current Protection Limit Modification
I have a SAMSUNG LCD Pc monitor and it shows for one second the logo and then the screen turns to totally black. The problem is on OZ960 Intelligent CCFL Inverter Controller. I bypassed the protection ...
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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 ...
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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 &...
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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 ...
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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 ...
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Laser detector circuit with ambient light rejection
I recently asked how to best detect dropped balls via laser detection.
Someone suggested ambient light rejection by modulating the laser and then filtering the photodetector input for that signal.
I ...
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Overvoltage Clamping protection for Boost Converter
I think my circuit is failing because of ESD and/or transients when initially connecting my device to a supply. How should I go about protecting the gate of M1? What's the best way to clamp the ...
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Newb - ice cream trailer overvoltage [closed]
Folks,
I have a ice cream on the Walkway over the Hudson in Poughkeepsie, NY. The NYS Park Department provides power: “30AMP 240V” they say. I am running a Taylor c722 softserve machine. It’s happy ...
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How to protect an ADC input from a 100V AC voltage
I would like to know to how to protect my ADC from a 100V AC 50Hz input to the analog inputs of the ADS112C04.
This ADC is used to measure a max differential voltage across a shunt of 50mVrms at 50Hz.
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What indicators can I use to decide whether a power bank which I am interested in buying will appropriately regulate current and voltage?
Anker, one of the largest manufacturers of power banks, often indicates in its ads that the product in question uses a specific system, MultiProtect, to avoid stressing the phone battery which is ...
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Oscilloscope front end - over voltage protection
I have been looking around at different front end implementations for a DIY oscilloscope and came across a variant that I found simple enough as a starting point.
I have a question about protecting ...
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Need a way to regulate current and voltage in CCCV but portable
I have a project in embedded systems that requires charging a 14S lipo battery from a 60V regulator/alternator supply (an RC vehicle), the lipo gets to 99% capacity around 58.8V and the circuit limit ...
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Can MOVs draw lots of current at low voltage?
This circuit should open my fuse in case of an intentional overvoltage attack.
(think as someone intentionally plugging 100V to the 24V input)
Thing is I can't afford to have more than 45V to the rest ...
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Adding hysteresis to over-voltage protection using comparator
I am trying to add hysteresis into my over-voltage detection circuit. The output of the comparator should be high as long as the supply voltage is below 14 V.
The circuit works perfectly fine, but I ...
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Load dump audible issue and large output ripple issue
We have a load dump circuit in one of the boards and which is designed using MAX16129UAAGA IC. The under-voltage and over-voltage range of this IC is 3 V and 31.5 V respectively. Currently, we are ...
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How can I protect my printer's motherboard from a failing NPN inductive probe?
I am wiring up my new 3D printer motherboard. I am using a lj12a3-4-z\bx inductive proximity sensor for my bed sensing probe. In order for the probe to function at ...
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Protect Arduino components from ESD damage from external input
I have an Arduino Due project that senses voltages through an ADC (ADS1115). The ADS1115 voltage sensor inputs will have intermittent connections. I have already fried my compass module by ESD and am ...
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OVP threshold for this converter
Here, this Boost converter, says that it can boost the input voltage from 2.5 V to 10 V.
My input is from a 7.4 V, 7.5 Ah battery. Output is 9 V. The maximum load current is 3 A.
Ideally, for my OVP ...
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Overvoltage protection issues with analog signal
I used this circuit to protect my analog input circuit from overvoltage. I put the models in a simulator and tested and it was showing that it works fine.
Coming now to real life, the circuit seems to ...
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Overvoltage protection circuit transistor draws 2x load current then suddenly stablizes
I've built an over voltage protection circuit according to this schematic by Maxim:
If the load is low power consumption like MCU or other ICs, it works just fine.
If the load is higher for example, ...
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Maximum absolute voltage (and currents) on STM32G microcontroller
According to the data sheet, the maximum absolute voltage on a GPIO pin is -0.3 and +4V, respectively and a max of 20mA source/sink. I am trying to understand where these requirements come from and to ...
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Voltage Level Shifter Sustained Overvoltage Protection
Situation
We have a board that accepts 3.3V signals for SPI, JTAG, UART and similar protocols.
We want to connect to interfaces on other boards that operate in the 1.8V to 5V voltage range and hence ...
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Voltage protection level Up of SPD (surge protection device)
I was going through the datasheet of the below SPD.
https://www.phoenixcontact.com/en-pc/products/type2-surge-arrester-val-sec-t2-3c-350-fm-2905339
It says, Voltage protection level Up ≤ 1.5 kV
It ...
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BLDC Motor Controller Failure
I am developing a robotic vehicle that has four BLDC scooter-style motors that are controlled by off-the-shelf, dual-motor controllers. I have had several of the controllers fail and am trying to ...
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Synchronous buck converter dies instantly after applying 24 V
I am using an AP63356Q to step down from 24 V to 12 V. Everything works fine when the 24 V is coming from a Meanwell S-150-24 AC-DC power supply, but the buck converter got fried when I changed the ...
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Bidirectional TVS diode for protecting dual-rail power
I read that the Raspberry Pi 4 uses a uni-directional TVS as over-voltage protection on USB power.
I also read some AC PSUs use a bi-directional TVS as over-voltage protection.
My circuit is powered ...
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Best overvoltage and reverse polarity protection
I would like to add overvoltage and reverse polarity protection to my circuit.
Searching on the internet, I saw that the solution that seems to be the most popular is this:
I have seen there is a lot ...
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Output OVP ratings in isolated AC-DC converter
I have an application where there can be considerable inductive flyback current into the supply rail, to raise it above the level naturally outputted by the AC-DC converter (48 V). Namely, the full ...
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Over voltage protection circuit ringing
I am testing the following circuit that is used as an over-voltage protection.
My load is 240ohm in parallel with 100uF.
When the OVP circuit is not loaded (I disconnect the output of the FET from ...
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Start heat pump (HVAC) from electric generator: AVR voltage surge issue
I'm trying to start the heat pump from the generator, and it turns out successfully...for an hour.
First of all, mandatory specs and preconditions:
heat pump: Mitsubishi Electric PUHZ-SHW140YHA
...
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Can a Zener diode protect an input pin that is driving low?
I am trying to protect a +5V Digital Output pin from miswiring to +12V, using a Zener diode.
When I simulate a simple protection circuit, the zener clamps the voltage as expected:
However this ...
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Can a USB socket draw more than 5 V?
As a complete newbie in electronics world, I need some advice.
My circuit has a female USB Type A socket for the source and my load is a 5 W 10ohm cement resistor used for heating. As long as the ...
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Diode for overvoltage
This may appear as a very simple question but I am looking for a cross reference for the BAT 54 diode. Here were I live, I can't get that diode. The circuit that I am using is below, so you have an ...
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Overvoltage protection with Zener for this reverse-polarity blocking schematic?
There is a very nice reverse-polarity blocking schematic, discussed here:
How shall I replace SW1, to immediately (as-soon-as-possible) open when ...
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What is this schematic symbol in the INA851 overvoltage schematic?
I was looking at the INA851 and trying to understand the input over-voltage protection. I can't seem to figure out what this pictured part is.
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Why don't Arduinos have a fuse on the Vin pin?
I am designing a PCB for an Arduino Nano. I want to protect the Nano from over current and high voltage. In the schematic of the Nano, there is only one fuse at USB Vcc at Arduino Nano Rev3. No clone ...
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