All Questions
Tagged with protection reverse-polarity
44
questions
6
votes
2
answers
631
views
BJT B-E Zenering: whither the collector?
So, I'm trying to analyze how the circuit in this question behaves when subject to reverse battery (vs. being driven from OUT to IN), and I'm running into a severe snag in the process, though. It ...
- 8,988
0
votes
0
answers
83
views
Reverse polarity protection + inrush current limiting with mosfets schematic
What do you think about this schematic? I want to put this before a DCDC 24 to 5V with maximum 1A. Any comments or suggestions? The aim of this circuit is to have a soft start with the resistor R2 in ...
- 61
2
votes
1
answer
287
views
Reverse polarity protection and inrush current limiting - back to back mosfets
I was testing this circuit in LTspice, it would protect my boards from reverse polarity and limit the inrush current to the input capacitor of a DC-DC (buck or LDO),
but the simulation gave me this ...
- 61
0
votes
1
answer
300
views
How to calculate the gate voltage and Vgs in this N-channel MOSFET reverse-polarity protection circuit?
The schematic below uses an N-channel instead of a P-channel to block reverse-polarity voltage from occurring. This means the gate voltage (and Vgs) must be positive. But there are two options I've ...
- 411
2
votes
2
answers
390
views
Will this NMOS MOSFET reverse-polarity protection circuit work?
Based on the helpful advice from the community, I realised the first schematic I made would not work as a protection for reverse polarity well due to a couple of flaws including the diode having to be ...
- 411
2
votes
2
answers
446
views
N Channel MOSFET reverse voltage protection proposal
While learning how to make a buck converter, I realised that using P channel mosfets for reverse voltage protection is one of the best ways, but I think it could be better using an N channel using the ...
- 411
2
votes
2
answers
913
views
How to limit P-channel MOSFET gate voltage?
While working on my first buck converter I thought it would be a good idea to add reverse-polarity protection. So I went and searched for what would be the best (and easiest) way to do it and found P-...
- 411
0
votes
2
answers
233
views
Reverse voltage protection of boost converter with Schottky diode shows small voltage output
I am testing reverse voltage protection using Schottky diode and found small but not trivial level of voltage leakage when combined with boost module in open circuit.
Here, as you can see, the 12 V is ...
- 221
0
votes
3
answers
243
views
Where is my mistake with this reverse-polarity protection circuit?
I am trying to do reverse-polarity protection on a 24V PCB. I read up on the PMOSFET method and I thought I had understood it, implemented it as follows:
If I connect the power supply correctly, the ...
- 199
0
votes
0
answers
78
views
Is this a functional and reliable Reverse polarity protection?
Guys, I am trying here to design a UPS controlling board, I designed this circuit and it was to some extent functional and it draws approximately 16mA - 20mA (I don't want to use the traditional one ...
0
votes
1
answer
107
views
Protecting Polarized capacitor from reverse voltage
I have a circuit with a P-channel MOSFET based reverse voltage protection. Will the polarized capacitor be "safe" if a reverse voltage is applied to the below circuit?
I've mocked it up in ...
- 1
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
1
vote
1
answer
140
views
Reverse polarity protection for 320 VDC, 20 A
I would like to add reverse polarity protection to my robot. Supply is 320 VDC, 20 A max. The load is mainly inductive (DC brushless motors, some DC/DC converters).
A simple solution would be using a ...
- 7,697
-1
votes
1
answer
156
views
Speaker protection circuit with polarized capacitor seeing reverse voltage. Why? How?
I am looking at this speaker protection circuit found in a vintage Technics receiver.
The signal from the speakers comes from the wire highlighted in green, coming from the output of a class AB power ...
- 53
0
votes
0
answers
231
views
How to protect this circuit from shorting out / reverse polarity?
I'm building a device that uses multiple TRS jacks for power and communication. (I know that audio jack is not the best choice for power but it's important for overall design and I really want to make ...
- 117