ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/18/18 08:47 PM
220/230/240V 60Hz Systems
by dsk. 10/17/18 01:25 PM
PLC/HMI Enclosure C2, D1
by ghost307. 10/16/18 03:31 PM
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 3 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
RE: My power supply post #185862
04/02/09 12:15 AM
04/02/09 12:15 AM
L
LoneGunman  Offline OP
Member
Joined: Oct 2005
Posts: 141
Florida
The webmaster of a small home plating website claims to use multiple variable voltage/amperage power supplies, he says he wires them up in a "master and slave configuration", because we need current more than voltage I'm assuming he's somehow wiring multiple supplies in parallel. Opinions on this?

So the power supply has 120 volts going in and two terminals supplying 12 - whatever volt DC. I obviously know how to wire batteries in parallel but how could power supplies be wired in parallel? I mean I cant take the 12 VDC + from the first PS and wire that to the 120v input, what am I missing?

He claims to be using 3 70A power supplies to provide him with 210A.

Tools for Electricians:
Re: RE: My power supply post [Re: LoneGunman] #185868
04/02/09 04:39 AM
04/02/09 04:39 AM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 799
Chicago, Il.
You can usually parallel the outputs of DC supplies but might have issues with different types. Getting the current shared equally is one. A bummer with high current supplies like you mentioned, is that it takes a ridiculous amount of capacitance to filter the output. This is especially true of a linear supply with 120Hz ripple. The 3 supplies would do well for you if they were fed from three phases and each had full wave outputs. The ripple frequency would increase but the ripple amplitude would be greatly reduced.
Joe

Re: RE: My power supply post [Re: JoeTestingEngr] #185875
04/02/09 12:40 PM
04/02/09 12:40 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,298
Estero,Fl,usa
Way back in the olden days when we had massive power supplies in computers they ganged several supplies together with short pieces of nichrome wire that acted as a resistor to balance the outputs.


Greg Fretwell

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,551 Are you busy
188,109 Re: Forum
177,738 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 15 (0.004s) Memory: 0.9517 MB (Peak: 1.0759 MB) Zlib enabled. Server Time: 2018-10-21 19:01:51 UTC