Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 | 3 

gzt

4359 posts

Uber Geek
+1 received by user: 201

Subscriber

  Reply # 751407 27-Jan-2013 09:09 Send private message

timmmay: Your scientifically magical way is called in parallel. Both power supplies positive terminals go to the positive terminal in the dust buster. In series the voltage increases, in parallel the current increases.

In practice that might not be a good idea with switch mode power supplies.

2860 posts

Uber Geek
+1 received by user: 33

Trusted

  Reply # 751492 27-Jan-2013 14:22 Send private message

gzt:
timmmay: Your scientifically magical way is called in parallel. Both power supplies positive terminals go to the positive terminal in the dust buster. In series the voltage increases, in parallel the current increases.

In practice that might not be a good idea with switch mode power supplies.


I would avoid connecting any kind of power supply in series (for higher voltage) unless it is out of one instrument like a lab bench supply.  Parallel (for higher current) on the other hand is perfectly fine most of the time.

For normal isolated switch mode power supplies (not switch mode lighting supplies or regulated linear brick power supplies) it is perfectly fine to parallel them.  This is because all of them have a series diode on the output, and the voltage feedback is either done from the primary flyback pulses or with a high impedance secondary side voltage divider so if one is switched off while the other is on there is essentially no current flowing back into it.

Unregulated linear "bricks" are the same, but regulated ones are not and the end user seldom knows if it is regulated or not so safer not to do it with a brick.

AC supplies certainly do not parallel or you can actually get mains out (in reverse) if one is unplugged from the wall.

Some lighting switch mode supplies might not be sufficiently isolated, or have a boost regulator so you do not have proper blocking.




You can never have enough Volvos!


1 | 2 | 3 
View this topic in a long page with up to 500 replies per page Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:




News »

Trending now »
Hot discussions in our forums right now:

Does NZ need better gun laws?
Created by mattwnz, last reply by mattwnz on 2-Sep-2014 01:07 (74 replies)
Pages... 3 4 5


Judith Collins: I am resigning
Created by Presso, last reply by gzt on 1-Sep-2014 23:59 (108 replies)
Pages... 6 7 8


Ashburton WINZ shooting
Created by gzt, last reply by Geektastic on 1-Sep-2014 23:12 (24 replies)
Pages... 2


Cirque du Soleil Cellphone Hijack
Created by myopinion, last reply by PhantomNVD on 1-Sep-2014 18:01 (21 replies)
Pages... 2


Lightbox quality comments
Created by ronw, last reply by Lurch on 1-Sep-2014 20:14 (99 replies)
Pages... 5 6 7


Orcon Global Mode launched
Created by freitasm, last reply by shk292 on 1-Sep-2014 11:32 (132 replies)
Pages... 7 8 9


Lightbox press event release
Created by freitasm, last reply by IcI on 30-Aug-2014 17:54 (562 replies)
Pages... 36 37 38


recovering light box video
Created by ronw, last reply by ripdog on 1-Sep-2014 21:12 (35 replies)
Pages... 2 3



Geekzone Live »
Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.