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Generally no, unless they were designed for it. But I figure youIs it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Instability - two regulating "loops" fighting and one losing.What are the potential problems
I suspected as much but finding one large enough is if possible veryOn Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com> wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com> wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com> wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com> wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
those switches look like decent supplies but are way over my hobby"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com> wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free , now
Yeah, I just checked the price out of interest.On 3/05/2011 11:50 PM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com
wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free , now
those switches look like decent supplies but are way over my hobby budget
, if I can source suitable pass transistors for a 48cdv rail building a
regulator control board will be easy
Thanks anyway , ebay offers 400 watts for under $100.00 delivered just
nothing large enough atm out of China
them about 30 + years ago and the tranny from a 150 amp dc tig , just"atec77"<atec77@hotmail.com> wrote in message
news:ipp2u9$4c0$1@dont-email.me...
On 3/05/2011 11:50 PM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com
wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If you
don't already have some of those, it's crazy to go that route instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free , now
those switches look like decent supplies but are way over my hobby budget
, if I can source suitable pass transistors for a 48cdv rail building a
regulator control board will be easy
Thanks anyway , ebay offers 400 watts for under $100.00 delivered just
nothing large enough atm out of China
Yeah, I just checked the price out of interest.
25 yrs ago you might have picked up an old Telecom rectifier good for a few
hundred amps.....
I have two of the old telstra transformers here from when I started with
On 4/05/2011 12:29 AM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:ipp2u9$4c0$1@dont-email.me...
On 3/05/2011 11:50 PM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com
wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If
you
don't already have some of those, it's crazy to go that route
instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free , now
those switches look like decent supplies but are way over my hobby
budget
, if I can source suitable pass transistors for a 48cdv rail building a
regulator control board will be easy
Thanks anyway , ebay offers 400 watts for under $100.00 delivered just
nothing large enough atm out of China
Yeah, I just checked the price out of interest.
25 yrs ago you might have picked up an old Telecom rectifier good for a
few
hundred amps.....
I have two of the old telstra transformers here from when I started with
them about 30 + years ago and the tranny from a 150 amp dc tig , just
sold my 3.5kw 48 vdc supply , I have a copy of switchmode power supplies
spice and p so when time permits might build one
There is a Honkers bloke who does 350 and 400 watt supplies very cheaply ,
perhaps one of the blade server 48Vdc remote supplies will show up at a
fair price
--
X-No-Archive: Yes
I can get cheap Asian industrial supplies @450watt each , will have to"atec77"<atec77@hotmail.com> wrote in message
news:ipp4o8$pgk$1@dont-email.me...
On 4/05/2011 12:29 AM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:ipp2u9$4c0$1@dont-email.me...
On 3/05/2011 11:50 PM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com
wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If
you
don't already have some of those, it's crazy to go that route
instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free , now
those switches look like decent supplies but are way over my hobby
budget
, if I can source suitable pass transistors for a 48cdv rail building a
regulator control board will be easy
Thanks anyway , ebay offers 400 watts for under $100.00 delivered just
nothing large enough atm out of China
Yeah, I just checked the price out of interest.
25 yrs ago you might have picked up an old Telecom rectifier good for a
few
hundred amps.....
I have two of the old telstra transformers here from when I started with
them about 30 + years ago and the tranny from a 150 amp dc tig , just
sold my 3.5kw 48 vdc supply , I have a copy of switchmode power supplies
spice and p so when time permits might build one
There is a Honkers bloke who does 350 and 400 watt supplies very cheaply ,
perhaps one of the blade server 48Vdc remote supplies will show up at a
fair price
--
X-No-Archive: Yes
You could link 4 ATX power supplies in series. You would have to open up 3
of them and cut the link between the negative terminal and earth.
It will be safe if you hard wire all 4 outputs together in series in a way
that they can not be disconnected. I think the only reason they earth the
negative output is so that it doesn't float at a high voltage WRT mains. So
if all your connections are good, the highest any output will float is 48V.
I thought about it but I need 48vdc @1500 watts , atx wont cut it but
Modern ATX supplies typically have two 12V 20A rails. But many dont realise
that they are not actually separate rails. The rails are separately filtered
with caps, but come from a single SM transformer. (typically)
So each ATX supplies 12V at 40A. Cost is about $40 each from ebay, so $160
is your total.
48V x 40A = 1920WOn 4/05/2011 9:09 PM, Mr Mac wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:ipp4o8$pgk$1@dont-email.me...
On 4/05/2011 12:29 AM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:ipp2u9$4c0$1@dont-email.me...
On 3/05/2011 11:50 PM, Dennis wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:iposj0$kta$3@dont-email.me...
On 3/05/2011 9:13 PM, Mik DaDik wrote:
On 3/05/2011 1:28 PM, atec77 wrote:
On 3/05/2011 10:58 AM, who where wrote:
On Tue, 03 May 2011 07:31:28 +1000, atec77<atec77@hotmail.com
wrote:
Is it permissable to run a couple of dc switch mode supplies in
parallel to gain extra current capacity ?
Generally no, unless they were designed for it. But I figure you
suspected that already.
What are the potential problems
Instability - two regulating "loops" fighting and one losing.
You *can* purchase units designed to operate as master/slave. If
you
don't already have some of those, it's crazy to go that route
instead
of just buying one that's man enough to do the whole job.
I suspected as much but finding one large enough is if possible
very
expensive , might have to reconsider making another linear
What Voltage current are you looking for?
Mik
48Vdc 1500 watts
--
X-No-Archive: Yes
Meanwell SMPS ~$700 ea
RSP-1500-v, 1500W SMPS v = 5V, 12V, 15V, 24V, 27V, 48V...
70-110% V adj, alarm o/p, parallel up to 5400W, 12V aux.
http://users.tpg.com.au/users/p8king/s100.htm
I have a large junk box , I have caps , sinks and transformer free ,
now
those switches look like decent supplies but are way over my hobby
budget
, if I can source suitable pass transistors for a 48cdv rail building
a
regulator control board will be easy
Thanks anyway , ebay offers 400 watts for under $100.00 delivered
just
nothing large enough atm out of China
Yeah, I just checked the price out of interest.
25 yrs ago you might have picked up an old Telecom rectifier good for a
few
hundred amps.....
I have two of the old telstra transformers here from when I started with
them about 30 + years ago and the tranny from a 150 amp dc tig , just
sold my 3.5kw 48 vdc supply , I have a copy of switchmode power supplies
spice and p so when time permits might build one
There is a Honkers bloke who does 350 and 400 watt supplies very cheaply
,
perhaps one of the blade server 48Vdc remote supplies will show up at a
fair price
--
X-No-Archive: Yes
You could link 4 ATX power supplies in series. You would have to open up
3
of them and cut the link between the negative terminal and earth.
It will be safe if you hard wire all 4 outputs together in series in a
way
that they can not be disconnected. I think the only reason they earth the
negative output is so that it doesn't float at a high voltage WRT mains.
So
if all your connections are good, the highest any output will float is
48V.
I thought about it but I need 48vdc @1500 watts , atx wont cut it but I
can get cheap Asian industrial supplies @450watt each , will have to
check the schematic to see if it might work
Ta
Modern ATX supplies typically have two 12V 20A rails. But many dont
realise
that they are not actually separate rails. The rails are separately
filtered
with caps, but come from a single SM transformer. (typically)
So each ATX supplies 12V at 40A. Cost is about $40 each from ebay, so
$160
is your total.