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Old 05-22-2012, 07:07 PM #1
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Cool No more reverse polarity protection!

Well, as far as I know it some people accidentally damage drivers & diodes by inserting the batteries the incorrect polarity. But not anymore! using this you can insert the batteries however you want to as long as you place this device before the driver input, you'll never kill another diode because of batteries

I have a version of this planned to be an 17mm with contact board but I had a bunch of diodes lying around so I figured I could still use them and others can too but for an amazing price! For all of these that I have now they are 1$ each thats definetly worth the investment of never killing another diode or driver!

Here's some pictures


This is what you get for 1$


this is how you hook it up



Here's a demo showing it working

Notice when I switch the input polarity it still outputs positive voltage

This does drop Aproximately 0.3V though

I've got exactly 10 of these so get them while they last


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Old 05-23-2012, 02:05 PM #2
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Default Re: No more reverse polarity protection!

How is it only droping .3V?
what diodes are these?
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Old 05-23-2012, 02:13 PM #3
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Default Re: No more reverse polarity protection!

Has to be a Schottky diode. 2 of them in series would be around that voltage.

Schottky diode - Wikipedia, the free encyclopedia

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Old 05-23-2012, 02:13 PM #4
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Default Re: No more reverse polarity protection!

That is a bridge rectifier...
The input still goes through 2 diodes in either input
direction.
There is a Forward Voltage drop through a rectifier
diode. It would be wise to use a Shottky type diode
to lower the Foward Voltage losses...

You also need to choose a diode that can handle the
current required by the Driver/LD..


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Old 05-23-2012, 02:23 PM #5
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by xStatiCa View Post
Has to be a Schottky diode. 2 of them in series would be around that voltage.

Schottky diode - Wikipedia, the free encyclopedia
Generaly the ones with an extremely low VF are not the ones that can handle a couple Amps.

Mouser has thousands of diodes for sale, only a handfull are .15v forward voltage. (none of them can do high current)

Currious the spesific one he chose.
or if mabye he meant .3V each, or .6V total
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Old 05-24-2012, 04:34 PM #6
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by lasersbee View Post
That is a bridge rectifier...
Agreed. One of the few diagrams that are still etched in by brain by 2 years of electronics classes way back in high school. The diagram even shows AC on the input.
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Old 05-24-2012, 05:08 PM #7
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Default Re: No more reverse polarity protection!

So, the logic seems to work, but how could it be used in the common host types used (where case is the common: as in case negative for a reddie or a blue, and case positive for a green module or IR)? You would have to isolate the case and the heat sink, or the diode itself.
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Old 05-24-2012, 05:58 PM #8
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Default Re: No more reverse polarity protection!

The latest Schottky bridge rectifiers only have ~0.44 Volt loss @ 1-2 amps.

Of course, only one Schottky rectifier at the diode . . .

would give polarity protection

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Old 05-24-2012, 06:41 PM #9
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by LarryDFW View Post
Of course, only one Schottky rectifier at the diode . . .

would give polarity protection

LarryDFW

Correct:



It's as simple as this (ignore the part numbers above, they are irrelevant, any diode will work): Picture the above as the input connection on an LM317 driver (or any other type of driver), with the driver connected at the right-hand side of the diagram and the DC from the batteries or PSU on the left. If you connect the positive and ground as shown, the connected load will work correctly. If the polarity is reversed the diode diverts all voltage over .3V-.7V (depending on the type of diode) to ground, protecting the connected load. Thus, all that is needed is a single diode.
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Old 05-24-2012, 07:59 PM #10
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Default Re: No more reverse polarity protection!

Yea forget about this one, it's terrible....

I'll make one with mosfets instead it should be much more efficient
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Old 05-24-2012, 08:17 PM #11
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by AnthoT View Post
Yea forget about this one, it's terrible....

I'll make one with mosfets instead it should be much more efficient
I wouldn't say it's terrible, you shouldn't sell yourself short. What you made is a bridge rectifier which is extremely useful for converting AC to DC. It's just that you overthought the problem of reverse polarity damage, resulting in an overly complicated solution. Happens all the time, which is why engineers have a nice acronym that helps remind us: "KISS" = Keep It Simple Stupid!! lol..
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Old 05-24-2012, 08:20 PM #12
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by ElektroFreak View Post
I wouldn't say it's terrible, you shouldn't sell yourself short. What you made is a bridge rectifier which is extremely useful for converting AC to DC. It's just that you overthought the problem of reverse polarity damage, resulting in an overly complicated solution. Happens all the time, which is why engineers have a nice acronym that helps remind us: "KISS" = Keep It Simple Stupid!! lol..
Lol, I'll just make one with mosfet if anyone needs AC to DC convertion I'll let anyone have these for 0.25$ each
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Old 05-24-2012, 09:51 PM #13
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by ElektroFreak View Post
Correct:



It's as simple as this (ignore the part numbers above, they are irrelevant, any diode will work): Picture the above as the input connection on an LM317 driver (or any other type of driver), with the driver connected at the right-hand side of the diagram and the DC from the batteries or PSU on the left. If you connect the positive and ground as shown, the connected load will work correctly. If the polarity is reversed the diode diverts all voltage over .3V-.7V (depending on the type of diode) to ground, protecting the connected load. Thus, all that is needed is a single diode.
Problem. Then the diode is basically conducting whatever current the battery can muster. Since a diode isn't resistance it will get very, very, hot, very very fast, and will more than likely short/explode/ or go open.
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Old 05-24-2012, 11:11 PM #14
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Default Re: No more reverse polarity protection!

More effective, and I'm not sure why I didn't draw this instead (brain fart I guess, was working on a computer at the time), would be to put a diode in series with the + DC line oriented so that current can only flow in the proper direction. Then even if the polarity is reversed no current can flow thus the circuit can't be completed.
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Old 05-25-2012, 07:36 AM #15
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Default Re: No more reverse polarity protection!

Quote:
Originally Posted by AnthoT View Post
Lol, I'll just make one with mosfet if anyone needs AC to DC convertion I'll let anyone have these for 0.25$ each
What an original idea..........

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Old 05-25-2012, 08:25 AM #16
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Default Re: No more reverse polarity protection!

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