Two power supply in Parallel.

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Two power supply in Parallel.

Postby Fabiosb » Wed 24. Sep 2014, 04:59

Hello guys!

I have seen some people using two car batteries or a battery and a power supply in parallel, but I did not find anyone using two DC power supply. I already have two PS 24V 14.6A. Can I put them in parallel? I have to use some diode between them?

3250

I have to use only one PS because I'm using a Pololu VNH5019 who has only one Vcc input for two DC motors.

3251

Thanks!
Sorry my English :mrgreen:
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Re: Two power supply in Parallel.

Postby dualin » Thu 25. Sep 2014, 00:21

Yes, you can use 2 power supplies in parallel, but they must be the same or very closer. And you must to put a Schottky diode in the circuit. Like the MBR60100PT for example.

Regards
Dualin


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Re: Two power supply in Parallel.

Postby Fabiosb » Mon 29. Sep 2014, 15:21

Thanks Dualin! :D
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Re: Two power supply in Parallel.

Postby Fabiosb » Wed 1. Oct 2014, 03:54

Hi Dualin!

I'm having trouble to find a Schottky diode 30V-30A, can I use one with higher voltage? Like 40V-30A or 100V-40A?
What happens if I use one with a higher voltage or current?

Thanks again!
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Re: Two power supply in Parallel.

Postby pipis2014 » Fri 3. Oct 2014, 23:04

Fabiosb wrote:Hello guys! I have seen some people using two car batteries or a battery and a power supply in parallel, but I did not find anyone using two DC power supply. I already have two PS 24V 14.6A. Can I put them in parallel? I have to use some diode between them?

One thing you should consider is that you should trim your PSUs so that the voltage at the cathode of the diode is similar(preferably under load).
If not then the psu with the highest voltage is very likely to take up most of the load.

This is what some guys from the local r/c club advised me to do when i asked them the same question some time ago.
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Re: Two power supply in Parallel.

Postby Fabiosb » Fri 17. Oct 2014, 00:10

pipis2014 wrote: One thing you should consider is that you should trim your PSUs so that the voltage at the cathode of the diode is similar(preferably under load).If not then the psu with the highest voltage is very likely to take up most of the load.


Hi pipis2014, thanks!

Yes, I read about that on other topics, I regulated the two PSUs to work with same voltage, 24v.
My question now is about the diode, each PSU can give 14.6A and 24V. Can I use one Schottky diode MBR3045 (30A 45V)? I will face some kind of problem using a higher voltage diode?
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