Wrong Polarity Protection Circuit

133

01:38:06

Checks wrong polarity and shows indicator LEDs.

published 9 years ago

GingerKing

9 years ago

Also draws 5 amps in reverse

kuw

9 years ago

Fixed 😁

hurz

8 years ago

And whats the PMOS for? Remove it and see.

kuw

8 years ago

Thats for efficiency, so that it draws no current when the psource is in wrong polarity. The PMOS does not turn on. Without it it would draw current, since the diode will draw some current. Correct me if i'm wrong. Thanks for all the nice comments. I'm a beginner in electronics.

hurz

8 years ago

Again, the diode is doing the complete job. The pmos just waste some energy.

Cometxt

8 years ago

I agree two components doing the same job, however I disagree on the solution. I suggest you keep the PMOS and remove the diode. This will reduce power loss if a PMOS of suitably low RDSon is chosen. Check it out by noting current flow through led before and after removal of the diode, and flipping source round. Circuit still works yet you have more power to play with, and less power loss. Real downside in reality is cost of PMOS v diode v efficiency.

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