Let me explain about reverse polarity protection or reverse voltage or reverse current condition. Actually, sometimes it may happen, output voltage rises higher than input voltage, and hence current may start to flow from output terminal to input terminal. This is reverse current condition and may damage your circuit. In electronic devices, swapping of negative and positive leads of battery may result in a damage. Because current flow in opposite direction. Similar situation also occurs in case of an accidental short circuit.
So, what is the solution? What you should do to prevent your circuit. There are various reverse polarity protection circuits available, differ in efficiency and and operation.
To drive electronic devices safely, you need to have a proper input voltage and current polarities. You can get reverse polarity protection with the help of diodes. It has characteristic property of flowing current only in one direction makes it popular in reverse protection circuits.
The simplest form of reverse polarity protection is a single diode connected in series with the battery. Look at the circuit below, in case of reverse polarity, reverse current from output terminals to input terminals, the diode remains reverse biased.
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| Reverse Protection Diode |
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