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From: Joe Pfeiffer on 6 Jul 2010 13:12
beecrofter <beecrofter(a)yahoo.com> writes:

> A neat use for bridge rectifiers is to put in battery powered devices
> so that the battery can go in either way .

Coincidentally, comp.robotics.misc has just been having a lively thread
regarding these battery contacts that allow a battery to be inserted in
either orientation, completely through the geometry of the contacts.

http://www.pcmag.com/article2/0,2817,2365995,00.asp
--
As we enjoy great advantages from the inventions of others, we should
be glad of an opportunity to serve others by any invention of ours;
and this we should do freely and generously. (Benjamin Franklin)
From: William Sommerwerck on 6 Jul 2010 13:26
>> A neat use for bridge rectifiers is to put in battery powered devices
>> so that the battery can go in either way .

> Coincidentally, comp.robotics.misc has just been having a lively thread
> regarding these battery contacts that allow a battery to be inserted in
> either orientation, completely through the geometry of the contacts.

> http://www.pcmag.com/article2/0,2817,2365995,00.asp

I was about to say something ironic/sarcastic, about how this has already
been done with battery shape -- but was pleased to read that this system
works with common existing cells. Great idea -- if it works.


> As we enjoy great advantages from the inventions of others, we should
> be glad of an opportunity to serve others by any invention of ours;
> and this we should do freely and generously. (Benjamin Franklin)

"Giving away" inventions is not necessarily a good thing. The patent system
actually encourages invention by increasing the likelihood an inventor will
profit from his ideas.


From: DoN. Nichols on 6 Jul 2010 20:06
On 2010-07-06, beecrofter <beecrofter(a)yahoo.com> wrote:
> A neat use for bridge rectifiers is to put in battery powered devices
> so that the battery can go in either way .

Presuming that the device can accept the loss of two diode
forward drops from the battery to the load. (About 1.4V at reasonable
current levels and with silicon diodes.) Some things are close enough
to their minimum voltage threshold so this would not work well.

If the battery and diode are followed by a regulator, you
probably are all right.

Enjoy,
DoN.


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--- Black Holes are where God is dividing by zero ---
From: Karl Townsend on 6 Jul 2010 20:23

"DoN. Nichols" <dnichols(a)d-and-d.com> wrote in message
news:slrni37h3q.4ds.dnichols(a)Katana.d-and-d.com...
> On 2010-07-06, beecrofter <beecrofter(a)yahoo.com> wrote:
>> A neat use for bridge rectifiers is to put in battery powered devices
>> so that the battery can go in either way .
>
> Presuming that the device can accept the loss of two diode
> forward drops from the battery to the load. (About 1.4V at reasonable
> current levels and with silicon diodes.) Some things are close enough
> to their minimum voltage threshold so this would not work well.
>
> If the battery and diode are followed by a regulator, you
> probably are all right.
>
> Enjoy,
> DoN.

I'm curious. I use a 2:1 transformer, bridge rectifier and caps to power 80
volt AMC drives. This comes out about 4 volts high but hasn't seemed to
cause trouble. For a cheap volt drop could you just run the DC out through a
couple more diodes on a bridge rectifier?

Karl



From: William Sommerwerck on 6 Jul 2010 21:00
> I'm curious. I use a 2:1 transformer, bridge rectifier and
> caps to power 80V AMC drives. This comes out about
> 4V high but hasn't seemed to cause trouble. For a cheap
> voltage drop could you just run the DC out through a couple
> more diodes on a bridge rectifier?

Yup. Each silicon diode gives 0.6V to 0.7V drop. Make sure the diode's
current rating is sufficient.


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