What to do to prevent reverse connection of the power supply

In remote networking projects, it is easy to misuse the reverse connection of the power supply. However, the reverse polarity of the power supply will usually cause the back-end capacitor to explode or the chip to burn, resulting in irreversible consequences.
 
Not sure if this is a question.

But...

To prevent a reverse connection of a power supply, you can use a diode, a fuse, or a polarized connector. A diode allows current to flow in only one direction, while a fuse will blow if too much current flows in the reverse direction. A polarized connector ensures that the power supply can only be connected in the correct orientation. Additionally, it is crucial to ensure that the power supply is appropriately labeled with the correct polarity and to always verify the correct orientation before making a connection.
 
Late reply, but a good circuit for reverse polarity is the combination of diode and fuse, with fuse in series with the connector and diode connected across the poles such that if the polarity is connected correctly, the diode is blocking and in reverse the diode conducts (acting as a short-circuit) drawing a large current and blowing the fuse.
 
You can try to use a PMOS, as connected here: PMOS to protect against wrong polarity.
Its advantage over a diode is that, when the polarity is "right", a smaller voltage reduction AND a much smaller POWER dissipated than for a diode forward biased.

You can run the Simulation, without modifying the parameters, to see that no voltage reaches the load if the voltage is reverse (negative). Click on the schema, ask a Simulation (bottom middle-left), and run the Time Domain simulation.
 
To prevent the reverse connection of a power supply, ensure that connectors and plugs are designed to be unidirectional, meaning they can only be connected in one orientation. Additionally, label connectors clearly, use color-coding, and provide training to users to avoid incorrect connections.
While that seems evident, a problem is that a DC power source is often from AA or AAA cells which can be installed in the reversed position. A connector is NOT involved to start with. Sure, the problem is not there if your power source is from an USB cable (or another similar unidirectional connector), but then, the widget-gizmo MUST be used besides a desktop PC, or something like it.
 
A good power supply should have its terminal blocks well labelled to differentiate power, ground, and signal connections. Therefore, before making any connection to the power supply, ensure you do the right thing, which involves visual observation, and if need be, use a multimeter to determine the right connection path for everything you want to connect.
 
You can try to use a PMOS, as connected here: PMOS to protect against wrong polarity.
Its advantage over a diode is that, when the polarity is "right", a smaller voltage reduction AND a much smaller POWER dissipated than for a diode forward biased.

You can run the Simulation, without modifying the parameters, to see that no voltage reaches the load if the voltage is reverse (negative). Click on the schema, ask a Simulation (bottom middle-left), and run the Time Domain simulation.
Thank you so much for sharing the link.

Edit: It worked for me.
 
You can try to use a PMOS, as connected here: PMOS to protect against wrong polarity.
Its advantage over a diode is that, when the polarity is "right", a smaller voltage reduction AND a much smaller POWER dissipated than for a diode forward biased.


You can run the Simulation, without modifying the parameters, to see that no voltage reaches the load if the voltage is reverse (negative). Click on the schema, ask a Simulation (bottom middle-left), and run the Time Domain simulation.




Thanks for the info. I will try PMOS. I will try it later. For, I need a help from this https://academized.com/pay-for-research-paper site and when I am done with my work after that I will try it and will update you, if I face any issue.
Thanks for the info. I will try PMOS.
Edit: I tried PMOS and it works. You made my day.
 
Top