Avoid polarity inversion

MaXiZ · 1st March 2004, 08:51 PM

Is there a schematic that "check" the polarity and if it's not correct don't allow the volt to pass??
I need this for a SMPS.. If i connect erroneously the +/-inverted i'll burn a lot of component...

till · 1st March 2004, 09:03 PM

yes. a diode.

MaXiZ · 1st March 2004, 09:22 PM

????
positive input ==>
Negative input<==
???

till · 1st March 2004, 09:30 PM

you have your source ( power supply) and you circuit you connect to the source. Just build a diode in series with your circuit. A schottky will drop 0,1 or 0,2 Volt and will leave current flow only if connection between circuit and power supply is right direction. Whats the problem?

MaXiZ · 2nd March 2004, 04:48 PM

I mean if i connect the CAR BATTERY to SMPS...
If i invert +/- i'll burn the SMPS!!

till · 2nd March 2004, 04:54 PM

and what makes the difference? i can´t see more solutions than diode --> protection against current flow in wrong direction or fuse ---> protection against too much current flowing.

Sch3mat1c · 3rd March 2004, 03:16 AM

Bridge rectifier (mind the two diode drops)

MaXiZ · 3rd March 2004, 05:55 AM

Quote:

Bridge rectifier (mind the two diode drops)

To protect against polarity inversion at the input of SMPS???

1st March 2004, 08:51 PM	#1
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	Avoid polarity inversion Is there a schematic that "check" the polarity and if it's not correct don't allow the volt to pass?? I need this for a SMPS.. If i connect erroneously the +/-inverted i'll burn a lot of component...

3rd March 2004, 03:16 AM	#7
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Bridge rectifier (mind the two diode drops) __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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1st March 2004, 09:03 PM	#2
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	yes. a diode.

1st March 2004, 09:22 PM	#3
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	???? positive input ==> Negative input<== ???

1st March 2004, 09:30 PM	#4
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	you have your source ( power supply) and you circuit you connect to the source. Just build a diode in series with your circuit. A schottky will drop 0,1 or 0,2 Volt and will leave current flow only if connection between circuit and power supply is right direction. Whats the problem?

2nd March 2004, 04:48 PM	#5
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	I mean if i connect the CAR BATTERY to SMPS... If i invert +/- i'll burn the SMPS!!

2nd March 2004, 04:54 PM	#6
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	and what makes the difference? i can´t see more solutions than diode --> protection against current flow in wrong direction or fuse ---> protection against too much current flowing.

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