All Questions
Tagged with protection over-voltage-protection
27
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
15
views
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 ...
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?.
0
votes
0
answers
77
views
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 ...
3
votes
2
answers
392
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 ...
- 7,119
1
vote
2
answers
179
views
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 ...
- 1,326
3
votes
2
answers
2k
views
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 ...
- 828
0
votes
2
answers
2k
views
How to adjust a 3S BMS to connect a 2S Lithium ion battery pack to it?
I have a 2S Lithium ion battery pack and a 3S 18650 BMS protection board. I need to connect the pack to the board. While researching, I've noticed that this can be done by connecting a component ...
3
votes
2
answers
729
views
What is the purpose of this dual-facing diode?
I'm trimming off some parts from an eval board schematic, and I'm not sure what the purpose of this dual-facing diode / rectifier is.
The voltage divider from R33 and R48 is scales by a factor of 10 ...
- 223
4
votes
0
answers
150
views
What is an "integrated self-opening load switch" actually called?
Here is a throw-away circuit to illustrate the behaviour I'm looking for:
simulate this circuit – Schematic created using CircuitLab
Basically a load switch, but during an over-voltage event ...
- 3,229
0
votes
1
answer
132
views
Communication Line Protection
I intend to protect a BUS switches ICs, whose voltage on its pins cannot exceed 5.5V and 3.3V. The current cannot exceed 16mA.
The circuits needs to opperate from 3.3V to 5V. But automotive ...
- 917
0
votes
1
answer
369
views
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
0
answers
157
views
Transformer surge protection with MOSFETS
I'm trying to come up with a good solution to protect a 48VAC circuit against power spikes from the transformer when the load is suddenly disconnected.
Since I have a bunch of MOSFETs and Zeners at ...
- 123
1
vote
1
answer
932
views
Protection circuit with polyfuse and zener
I'm designing a protection circuit with polyfuse and zener for DC 5v input. I have try it fisically but the polyfuse never trigger because the zener burns before when I plug 6-12V to the input.
My ...
- 13
0
votes
1
answer
274
views
When is a fuse used in tandem with a breaker/MCB?
I have observed that at the input (supply side) of some electrical units, only MCB is used for overcurrent protection; whereas in other units, a fuse is used as well as MCB at the input side.
Why and ...
