[SI-LIST] Re: DC Power supplies Connected in parallel
- From: "Traa, Boris" <boris.traa@xxxxxxxxxxx>
- To: "erfan@xxxxxxxxxxxxxxx" <erfan@xxxxxxxxxxxxxxx>, 'Istvan Novak' <istvan.novak@xxxxxxxxxxx>
- Date: Sat, 11 Aug 2012 17:28:08 +0000
In case of proper supply design nothing will be damaged except for the 5V
connected components that can not withstand 12 V appearing now as supply
voltage.
Kind regards
Boris Traa
System design engineer EMC
It's the currents that make circuits work or fail.
Philips Innovation Services/EMC center
Room 2.020
High Tech Campus 26
5656AE Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail: boris.traa@xxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Erfan
Sent: Saturday 11 August 2012 4:40 PM
To: 'Istvan Novak'
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: DC Power supplies Connected in parallel
Istvan,
For now I wanted to know what happens in this condition and also wanted to know
practical issues of using them in this fashion? It is not for any purpose but
to know what exactly happens in this context.
-----Original Message-----
From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxx]
Sent: Saturday, August 11, 2012 5:37 PM
To: erfan@xxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: DC Power supplies Connected in parallel
Erfan,
Next question is: do you want to do this on purpose, say feeding some
electronics either from 12V or from 5V, or do you try to find out what happens
when two outputs set to very different voltages get shorted unintentionally?
Regards,
Istvan Novak
Oracle
On 8/11/2012 10:30 AM, Erfan wrote:
> Hai Istvan Novak,
>
> I am talking about 2 different power supplies one set to 12V and other
> set to 5V. What happens when this 2 supplies are connected in parallel?
>
> Regards,
> Erfan
>
> -----Original Message-----
> From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxx]
> Sent: Saturday, August 11, 2012 5:27 PM
> To: erfan@xxxxxxxxxxxxxxx
> Cc: si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: DC Power supplies Connected in parallel
>
> Erfan,
>
> Are you talking about connecting 12V and 5V outputs together or are
> you talking about connecting in parallel nominally the same output
> voltages generated from different (5V and 12V) input voltages? Both
> questions may be legitimate, but the answers and tradeoffs could be very
> different.
>
> Regards,
>
> Istvan Novak
> Oracle
>
> On 8/11/2012 9:12 AM, Erfan wrote:
>> Hai Steve,
>>
>> Is it a good idea to put a different power supplies in parallel (like
>> I
> said
>> 12V and 5V). If they are not current limited what happens? Is this
>> configuration usable? Also what happens if they are current limited?
>>
>> Can you give some detailed explaination.
>>
>> Regards,
>> ERFAN
>>
>> -----Original Message-----
>> From: steve weir [mailto:weirsi@xxxxxxxxxx]
>> Sent: Saturday, August 11, 2012 12:37 PM
>> To: si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] Re: DC Power supplies Connected in parallel
>>
>> On 8/11/2012 2:13 AM, Erfan wrote:
>>> Hai Everyone,
>>>
>>>
>>> I have few questions regarding the DC power supplies.
>>>
>>>
>>>
>>> What happens when 2 DC-power supplies are connected in parallel
>>> which
has
>> 2
>>> different voltages let say one has 12V and other has 5V.
>> It depends on the power supply designs. If they are not current
>> limited, you replace the fuses and perform other necessary repairs.
>>
>>> What happens to
>>> their voltage and current, current has to get added up to my
>>> knowledge
>> does
>>> it really happen in this case?
>> Ohm's Law prevails.
>>> What happens to voltage do I see 12V or 5V?
>>> what happens in case of grounds are isolated and not isolated?
>>> If I have to
>>> generate more current using 2 DC supplies in parallel then what care
>>> or configuration I should use. Wanted to know the practical
>>> limitations of using them.
>>>
>> Use supplies designed to share current.
>>>
>>>
>>> Kindly through some light in this regard.
>>>
>>>
>>>
>>> Regards,
>>>
>>> Erfan
>>>
>>>
>>>
>>>
>>>
>
>
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