making a Bridge Rectifier from Diodes ?

O

Omicron

Guest
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there
is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

thanks
 
Omicron wrote:
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there
is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

thanks
Click to expand...
I assume that you're in the USA.
Mouser has some rectifier modules that will fill your needs. Go to
www.mouser.com.and search for part number GBPC4004 or GBPC4006. The
GBPC4004 unit is rated at 400V/40A, and the GBPC4006 is rated for 600V/40A.
Either will work for your application (assuming no major physical mounting
problems).
Mouser has no minimum order, and reasonable shipping rates (for shipments in
the USA).

--
David
dgminala at mediacombb dot net
 
"Omicron" <omicron89@yahoo.com> wrote in message
news:74f52ab7-fc4e-4cc3-870e-237429108826@42g2000prb.googlegroups.com...
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there
is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

thanks
Click to expand...


http://uk.farnell.com/jsp/search/browse.jsp?N=500006+1004156+5056578&Ntk=gensearch_001&Ntt=bridge+rectifier&Ntx=mode+matchallpartial&No=0&getResults=true&appliedparametrics=true&locale=en_UK&catalogId=&prevNValues=500006+1004156&filtersHidden=false&appliedHidden=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D500006%2B1004156%26Ntk%3Dgensearch_001%26Ntt%3Dbridge%2Brectifier%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26catalogId%3D%26prevNValues%3D500006%2B1004156
 
On Fri, 7 May 2010 19:51:54 +0100, Gareth Magennis wrote:
"Omicron" <omicron89@yahoo.com> wrote in message:
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there
is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

http://uk.farnell.com/jsp/search/browse.jsp?N=500006+1004156+5056578
&Ntk=gensearch_001&Ntt=bridge+rectifier&Ntx=mode+matchallpartial
Click to expand...
&No=0&getResults=true&appliedparametrics=true&locale=en_UK
&catalogId=&prevNValues=500006+1004156&filtersHidden=false
&appliedHidden=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp
%3FN%3D500006%2B1004156%26Ntk%3Dgensearch_001%26Ntt%3Dbridge%2Brectifier
%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue
%26appliedparametrics%3Dtrue%26locale%3Den_UK%26catalogId%3D
%26prevNValues%3D500006%2B1004156

"Simple" , indeed.
 
On Fri, 07 May 2010 09:46:44 -0700, Omicron wrote:

I need to have a Bridge Rectifier 250V 40a ..... unfortunately there is
no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

thanks
Click to expand...
www.mccsemi.com


MCC Device Maximum Maximum Maximum
Catalog Marking Recurrent RMS DC C
Number Peak Reverse Voltage Blocking
Voltage Voltage
MP4005 MP4005 50V 35V 50V
MP401 MP401 100V 70V 100V
MP402 MP402 200V 140V 200V
MP404 MP404 400V 280V 400V
MP406 MP406 600V 420V 600V
MP408 MP408 800V 560V 800V
MP4010 MP4010 1000v 700V 1000v
 
In article <74f52ab7-fc4e-4cc3-870e-237429108826@42g2000prb.googlegroups.com>, Omicron <omicron89@yahoo.com> wrote:
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there
is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look like
they need a College COurse to navigate.

Any suggestions or simple equation ?

thanks
Click to expand...

A bridge only works 1/2 cycle so you would need at least 20 amp
diodes. I don't know what voltage your at but
400 volts sounds pretty good to me.

Maybe two of each, NTE5920, NTE5921
Thats when you don't want to isolate the mounting from the heatsink, otherwise
just take your pick.

Bad example as far as COST !!!
I don't have time right now to shop.

You can also add diodes in parallel to gain amperage.
I found some 40 amp 400 volt bridges, but seem hard to find stocked items.

greg
 
On 5/7/2010 1:24 PM GregS spake thus:

In article
74f52ab7-fc4e-4cc3-870e-237429108826@42g2000prb.googlegroups.com>,
Omicron <omicron89@yahoo.com> wrote:

I need to have a Bridge Rectifier 250V 40a ..... unfortunately
there is no such thing available as far as Google can see

Can anyone tell me what size Diodes that would work ? I am just a
hobbyiost and anything for instructions that I have found, look
like they need a College COurse to navigate.

Any suggestions or simple equation ?

A bridge only works 1/2 cycle so you would need at least 20 amp
diodes.
Click to expand...
Huh? Where do you get that?

Despite only operating half-cycle, each diode gets the full current
flowing through it, so you need *at least* 40A diodes, better yet 40A.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
 
On 5/7/2010 2:14 PM David Nebenzahl spake thus:

Huh? Where do you get that?

Despite only operating half-cycle, each diode gets the full current
flowing through it, so you need *at least* 40A diodes, better yet 40A.
Click to expand...
I meant to write "better yet *50A*".


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
 
On 5/7/2010 2:24 PM whit3rd spake thus:

On May 7, 9:46 am, Omicron <omicro...@yahoo.com> wrote:

I need to have a Bridge Rectifier 250V 40a .....

Huh? That's a device that makes 10,000W of DC
power at relatively high voltage. It's not terribly SAFE
to do that; normal switches and fuses cannot
control such DC power. Is this for a flashing
strobe light to illuminate a stadium?
Click to expand...
Hmm; maybe it's for an arc welder. Although I guess those use low
voltage but lotsa current, so maybe not.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
 
In article
<2edb1412-a185-4f08-aa0c-984a0966c179@o12g2000vba.googlegroups.com>,
whit3rd <whit3rd@gmail.com> wrote:

On May 7, 9:46 am, Omicron <omicro...@yahoo.com> wrote:
I need to have a Bridge Rectifier 250V 40a .....

Huh? That's a device that makes 10,000W of DC
power at relatively high voltage. It's not terribly SAFE
to do that; normal switches and fuses cannot
control such DC power. Is this for a flashing
strobe light to illuminate a stadium?
Click to expand...
Whit-

Yes, 250 times 40 is 10,000. That doesn't mean the bridge is being used
to produce 10,000 watts.

Both voltage and current may represent peak values of a low duty-cycle
application. If the bridge feeds a capacitor filter, the voltage peaks
across any one of the diodes would be 2.83 times the AC RMS value. That
would be 88.3 VRMS in this case.

With a 2X margin, actual stress might be 44 VRMS and 20 Amps peak, or
880 Watts peak power. With a low duty cycle, it would be even less.
This wouldn't be unreasonable for many applications such as rapidly
charging the batteries in a hybrid automobile!

Fred
 
On May 7, 9:46 am, Omicron <omicro...@yahoo.com> wrote:
I need to have a Bridge Rectifier 250V 40a .....
Click to expand...
Huh? That's a device that makes 10,000W of DC
power at relatively high voltage. It's not terribly SAFE
to do that; normal switches and fuses cannot
control such DC power. Is this for a flashing
strobe light to illuminate a stadium?
 
On May 7, 2:14 pm, David Nebenzahl <nob...@but.us.chickens> wrote:
On 5/7/2010 1:24 PM GregS spake thus:

A bridge only works 1/2 cycle so you would need at least 20 amp
diodes.

Huh? Where do you get that?

Despite only operating half-cycle, each diode gets the full current
flowing through it, so you need *at least* 40A diodes, better yet [50A].
Click to expand...
No, GregS is right. The rating of rectifiers is on the AVERAGE
current they pass (peaks can be much higher). The voltage
rating, for a bridge, has to be higher than the peak of the AC,
though, because there's a charged capacitor usually on the output.
So, a '250V 40A' bridge is made with 500V 20A rated diodes.
 
whit3rd <whit3rd@gmail.com> wrote:
On May 7, 2:14?pm, David Nebenzahl <nob...@but.us.chickens> wrote:
On 5/7/2010 1:24 PM GregS spake thus:

A bridge only works 1/2 cycle so you would need at least 20 amp
diodes.

Huh? Where do you get that?

Despite only operating half-cycle, each diode gets the full current
flowing through it, so you need *at least* 40A diodes, better yet [50A].

No, GregS is right. The rating of rectifiers is on the AVERAGE
current they pass (peaks can be much higher). The voltage
rating, for a bridge, has to be higher than the peak of the AC,
though, because there's a charged capacitor usually on the output.
So, a '250V 40A' bridge is made with 500V 20A rated diodes.
Click to expand...
what about inrush current?

Here's what hammond manufacturing says

http://www.hammondmfg.com/pdf/5c007.pdf
 
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