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Parallel Connecting Two Identical Switching PSUs

H

Holophote

Jan 1, 1970
0
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.

I've never done this with identical switchmode
regulators, and I'm wondering if it's practical
or even possible?

I've got two 20 volt - 3 amp brick style (also
called table-top) switching power supplies.
I'd like to combine the ouputs. In effect,
you would end up with an 20 volt - 6 amp
supply.

They are manufactured by Pihong.
Model No. PSA60W-200.
 
G

Genome

Jan 1, 1970
0
Holophote said:
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.

I've never done this with identical switchmode
regulators, and I'm wondering if it's practical
or even possible?

I've got two 20 volt - 3 amp brick style (also
called table-top) switching power supplies.
I'd like to combine the ouputs. In effect,
you would end up with an 20 volt - 6 amp
supply.

They are manufactured by Pihong.
Model No. PSA60W-200.

No no no, it's not a very auspicious start.

We just don't do that sort of stuff.

I've already reported you to [email protected] but (un)fortunately
they won't pay attention.

Stop being obsequious.

Obviously you need N-1 diode redundancy and a PID contoller.

The PIC men will be along later to sort you out.

DNA
 
E

Eeyore

Jan 1, 1970
0
Holophote said:
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.

No, it's bad practice.

Graham
 
L

Lionel

Jan 1, 1970
0
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.

Hell no! The two regulators will 'fight' over the exact output
voltage.
I've never done this with identical switchmode
regulators, and I'm wondering if it's practical
or even possible?

It's dangerous & it won't work.
 
P

Phil Allison

Jan 1, 1970
0
"Lionel"
Hell no! The two regulators will 'fight' over the exact output
voltage.


** Shame how it is so easy to do.

Natsemi publish application schems for it.




........ Phil
 
L

Lionel

Jan 1, 1970
0
"Lionel"



** Shame how it is so easy to do.

Natsemi publish application schems for it.

All of which involve additional circuitry for load balancing that
reduces regulation quality.
 
J

Joerg

Jan 1, 1970
0
Holophote said:
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.

I've never done this with identical switchmode
regulators, and I'm wondering if it's practical
or even possible?

I've got two 20 volt - 3 amp brick style (also
called table-top) switching power supplies.
I'd like to combine the ouputs. In effect,
you would end up with an 20 volt - 6 amp
supply.

They are manufactured by Pihong.
Model No. PSA60W-200.

I wouldn't do that. Amongst lots of other pathologies that can happen,
just imagine if one comes up a few millisecond later than the other and
feeds it from the back? KABLOUIE...
 
P

Phil Allison

Jan 1, 1970
0
"Lionel"
"Phil Allison"
All of which involve additional circuitry for load balancing that
reduces regulation quality.


** Ohhh - just a moment ago you said it couldn't be done at all.

Things are looking up.

It is in fact very easy to parallel two LM338s without loss of performance.

YOU just do not know how.



........ Phil
 
L

Lionel

Jan 1, 1970
0
"Lionel"
"Phil Allison"


** Ohhh - just a moment ago you said it couldn't be done at all.
Subject: "Parallel Connecting Two Identical Switching PSUs" - which
can't be done without a strong risk of letting out the magic smoke.
Things are looking up.

It is in fact very easy to parallel two LM338s without loss of performance.

YOU just do not know how.

No problem, I'm keen to learn. So, how do you do it without additional
components, & without reducing regulation quality?
 
P

Phil Allison

Jan 1, 1970
0
"Lionel the LIAR "
Subject: "Parallel Connecting Two Identical Switching PSUs" - which
can't be done without a strong risk of letting out the magic smoke.


** Lionel - YOU are a DAMN LIAR !!


No problem, I'm keen to learn. So, how do you do it without additional
components,


** YOU do not get to set such conditions on how.

**** OFF - you ASININE SHITHEAD



........ Phil
 
L

Lionel

Jan 1, 1970
0
"Lionel the LIAR "



** Lionel - YOU are a DAMN LIAR !!

Go ahead, parallel up the outputs of two switching PSUs & prove me
wrong. Please post photos of them afterwards. ;^)
** YOU do not get to set such conditions on how.

I knew you couldn't do it. Thanks for proving me correct.
**** OFF - you ASININE SHITHEAD

Aw. Diddums.
 
P

Phil Allison

Jan 1, 1970
0
"Lionel the CRIMINAL LIAR "


Go ahead, parallel up the outputs of two switching PSUs & prove me
wrong. Please post photos of them afterwards. ;^)


** **** OFF - YOU FUCKING NUT CASE LIAR !!


I knew you couldn't do it. Thanks for proving me correct.

** **** OFF - YOU FUCKING NUT CASE LIAR !!





.......... Phil
 
L

Lionel

Jan 1, 1970
0
"Lionel the CRIMINAL LIAR "



** **** OFF - YOU FUCKING NUT CASE LIAR !!

Translation from Philthish to English: "Oh shit, he's got me there.
I'd better scream & yell so nobody notices! That ALWAYS works!"
** **** OFF - YOU FUCKING NUT CASE LIAR !!

Translation from Philthish to English: "Oh shit, how can I scare him
off?"
 
M

Michael Black

Jan 1, 1970
0
Holophote" ([email protected]) said:
If electronics has been your hobbly or
profession for many years, I'm sure you've
connected two identical linear regulators.
An example would be connecting two 5 amp
LM338 regulators to produce a 10 amp supply.
No. I can remember when 3-terminal regulators were the latest
thing, but I've never run them in parallel. If you need that much
current, either you use a higher current regulator, or add an external
pass transistor.

What you're missing is that 3-terminal regulators were originally called
"on-card regulators". The intent was that you'd have one raw voltage
source, and distribute it to the various boards. ON each board, you'd
regulate with one of those 3-terminal regulators. That provided a level
of isolation between the boards, and meant you didn't need some massive
regulator and heat sink to feed it all.

If you really need more current than one switching supply supplies, then
don't be cheap, and buy a higher current switching supply. Or rework the
circuit so you can use two power supplies to feed separate parts of the
circuit.

Or rethink things, because you may not need a regulated supply, since
a lot of real current hogs don't need regulation.

Don't pass off hobbyist stuff as a design issue.

Michael
 
P

Phil Allison

Jan 1, 1970
0
"Lionel" <[email protected]>


** This pile of sub human garbage is another psychotic TROLL

Narcissistic and malicious as they come.





......... Phil
 
P

Phil Allison

Jan 1, 1970
0
"Michael Black"
"Holophote"
No.

** Wrong - again.
I can remember when 3-terminal regulators were the latest
thing, but I've never run them in parallel.


** Must be a lotta things YOU have not done - dickhead.

If you need that much
current, either you use a higher current regulator, or add an external
pass transistor.


** The latter means losing the overcurrent and overtemp protection built
into such regulators.

Also, two parallel regulators have double the dissipation capacity of one -
a higher current type will usually not.

Plus there is the cost issue - higher current regs are more expensive
than two in parallel.




......... Phil
 
L

Lionel

Jan 1, 1970
0
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"Lionel" <[email protected]>


** This pile of sub human garbage is another psychotic TROLL

Narcissistic and malicious as they come.





........ Phil

Phil "Philthy" Allison's histrionic Usenet history:
<http://groups.google.com/groups/sea....com.au+(****+OR+troll+OR+wanker)&qt_s=Search>
"Results 1 - 10 of about 2,320 for [email protected] (**** OR
troll OR wanker)"

Poor old Phil has a bit of a temper. ;^)
 
P

Phil Allison

Jan 1, 1970
0
"Lionel" <[email protected]>


** This pile of sub human garbage is another psychotic TROLL

Narcissistic and malicious as they come.

Anther usenet CRIMINAL.




......... Phil
 
H

Homer J Simpson

Jan 1, 1970
0
Why don't you plonk the phil thing? Everyone else has.
 
P

Phil Allison

Jan 1, 1970
0
"Homer J Simpson"


** YOU are disgusting and pathetic MORON - " Simpson".

Lionel is an obvious crazy person and a blatant TROLL.

Is your reading comprehension so INEPT you cannot tell ?




........ Phil
 
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