All Questions
Tagged with protection surge-protection
37
questions
-2
votes
1
answer
61
views
Why too many MOVs used in surge protectors?
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 ...
0
votes
0
answers
47
views
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?.
1
vote
4
answers
130
views
Risks of placing Varistor before Fuse for Mains Voltage
I have seen many questions on this and other forums asking about the best option to place the fuse relative to the varistor to protect it from mains voltage spikes and the answer was unanimous: The ...
- 73
1
vote
0
answers
56
views
Can this circuit limit power surges?
This circuit I had created based on MOV and a relay, it principle is: if a surge comes the MOV would get activated and should turn the relay thus the surge should be redirected.
Notes:
Input is ...
1
vote
1
answer
120
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Is it legally allowed to install lightning rods in rainy or cloudy weather?
I had a look at some standards (such as IEC 62305 & IEC 62561 Standards for Lightning Protection) on how lightning rods should be constructed, and also searched the internet. I found no real ...
- 11
1
vote
2
answers
573
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Use of MOVs without fuse?
I understand the MOVs become almost short-circuit when input voltage across them exceed a threshold.
But how does this protect the circuit behind the MOVs? Suppose the input power supply voltage ...
- 241
0
votes
3
answers
203
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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 ...
- 19
0
votes
2
answers
1k
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AC overvoltage protection using Zener diodes (and some other things)
I am considering building an AC protection circuit using the following schematics. I am a physicist and have little practical experience with implementation of electric circuits. Looking forward to ...
- 123
0
votes
0
answers
437
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How to best protect 12V from voltage transient spikes?
I am building an AC power supply and I decided to put digital current and voltage panel meters into it.
I have an issue where whenever my main contactor engages and disengages, there is a transient ...
- 1
14
votes
2
answers
6k
views
Suicidal ASUS power brick?
I was playing around disassembling an Asus laptop power brick (19V, 4.74A) and came across this strange arrangement in the circuit, where just after the bridge rectifier, there is a MOSFET (Q1, N ...
- 847
3
votes
2
answers
5k
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Supply turn-on voltage spikes - best practices for protection
The problem
I recently had a situation where a board had a destructive fail event from turning on a 53V battery which appeared to have had a voltage spike at least over 80V, most likely well over 100V,...
- 6,313
0
votes
1
answer
369
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How to design a discrete flat-clamp TVS circuit
I need something similar to the Texas Instruments TVS3300 but for a higher voltage. The TVS3300 is basically a drop-in replacement for a TVS diode that clamps the voltage using an internal mosfet and ...
0
votes
1
answer
460
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Will these 100 ohm resistors protect my GPIOs from power surges?
I am designing a circuit for a microcontroller that has a few 3.3V GPIO pins. I heard from somewhere that adding small resistor of around 100 ohms in series with the GPIO, will add some additional ...
- 49
0
votes
1
answer
609
views
ESD protection for power input with several fused branches
I'm designing an industrial board that will be powered with a +24V DC. On the PCB there are several fuses to protect each branch against over-current/short-circuit. Example:
simulate this circuit &...
- 1,235
1
vote
0
answers
465
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Why is the maximum voltage of a surge, 6kV inside home wiring?
I was reading about the benefits and cons of series mode surge protectors vs MOV-based surge protectors for home use.
First, why is the probability that a surge will exceed 6kV extremely low due to a ...
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