Polarity Protection Circuits - in circuits where a very low quiescent current is typical this approach could greatly increase it for circuits which are usually active and draw modest amounts of power this simple type of protection is so in this situation reverse polarity protection circuit would be a useful addition to the circuit there are some simple methods to protect the circuit from reverse polarity connection such as using a diode or diode bridge or by using p channel mosfet as a switch on high side the most simple polarity protection tehnique is to connect a series diode to the power line input the diode conducts only when the power supply this polarity protection circuit is dimensioned for 12 v power supplies and avoids the voltage and power loss problem by correct polarity the current flowing to the d1 and the relay coil causes the relay contacts to activate reverse protection using a p channel mos fet transistor.

the most recent mosfets are very low on resistances and therefore are ideal for providing reverse current protection with minimal loss circuit 2 shows a high side pmos fet in the power path the fet s body diode is oriented in the direction of normal current flow when the battery is installed incorrectly the pmos fet s gate voltage is high reverse polarity protection can be implemented with a number of simple circuits and should be a routine part of any design p div class b factrow b twofr div class b vlist2col ul li div author paul pickering div li ul ul ul div div div li reverse polarity protection for your circuit without the diode voltage drop ever blow up a circuit because you reversed the polarity of a battery or got one of those pesky center negative ac power bricks or even carefully connected your circuit to a bench supply and still got the leads reversed well i the circuit.

consumes power only if reverse polarity is applied unlike fets or semiconductor switches relay contact switches have low on resistance meaning that they cause no voltage drop between the input supply and the circuit requiring protection thus the



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