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.
Questions tagged [over-voltage-protection]
321 questions
2
votes
1 answer
Newb - ice cream trailer overvoltage
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 place is 220v.
The voltage at the outlet is in fact…
Philippe Pierre
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2
votes
1 answer
If an MCB protects from overcurrent, which device protects from overvoltage?
In the context of whole house protection devices used in distribution panel, if an MCB protects from overcurrent, which device protects from overvoltage?
Surge Protection Devices (SPD) can only protect from transient overvoltages before failing.…
Pavin Joseph
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1
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0 answers
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 than normal. The module appears to continue to work…
Dwayne Reid
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1
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2 answers
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 better option would be cool since i don't want to…
Tiago Conceição
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1
vote
1 answer
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 case the 12V line gets connected to the other…
Blasco
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1
vote
2 answers
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-stream (12V instead of 5V) the motor will blow up.…
bode
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1
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1 answer
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? This design is to used in the US so the mains…
Anuraag Rajasekhar
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0
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0 answers
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 not enough copper section to my taste, but there…
Sandro
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1 answer
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 Vout is raising above a certain voltage level (like above 5.1V)?
I thought of a Zener diode, to put…
Daniel
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1 answer
Over voltage protection on lock-in amplifier input
I'm performing an experiment in which I send a sine wave into a test device and try to measure its response which will be in the order of a few \$\mu\$V. This response is obtained from the buffered output of a controller box (commercial device…
DaanMusic
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- 1
0
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1 answer
Problem with overvoltage protection circuits limits
I have a circuit which input voltage shouldn't exceed 50 V, I can't use neither of available overvoltage protection circuits because of the limits each have;
Crowbar circuit. While this is a good approach, the fuse in the circuit is 10 A. What if…
ElectronSurf
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1 answer
Crowbar circuit fuse placement
I'd like to use the below circuit to protect my device from overvoltage.
simulate this circuit – Schematic created using CircuitLab
D1 is rated to 15V. SCR1 is supposed to be ON Semi MCR100-8G with maximum current of 800 mA. F1 supposed to be rated…
Zhenek
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0
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2 answers
Why would this (simple) over voltage protection circuit raise the output voltage?
as a beginner I have recreated this circuit:
I found it in this guide, and I was hoping it would work as intended but instead it gave me some weird results. I connected power to the circuit and probed the input voltage (2.5V), and then subsequently…
Buretto
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-2
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2 answers
Over voltage protection circuit using mosfet
I need over voltage cut off circuit.
If input voltage goes above 440V input power should cut off , once input voltage is back to normal 230V then switch (MOSFET) should be conducting and when supply voltage is greater than 440V MOSFET should not…
Nikhil Joshi
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-3
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1 answer
Overvoltage Protection Circuit Failed
I built this circuit for Vdd of a 8-bit MCU (3.3V nominal) and the input rating is 12-24V.
But when 12V input is used, MCU Vdd pin only receives around 1V, I guess Q1 isn't turning on.
The circuit is modified from Maxim Integrates AN-760. 760's…
Travis Su
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