Show your "heavy" PSU - Page 1
Forum section: electronics / general

author: cs.dk
author_rank: Unknown
timestamp: October 09, 2016, 01:58:29 pm
content: This is my PSU, when a regular bench PSU would not keep up with delivering amps.. It's roughly 15V unloaded in this configuration. Max amps? I don't know. But 5 meter 35 mm2 cable get quite hot in a second when shorted.I've got four of these smoothing output caps. And it'll be assembled with welding terminals, as showed in the picture.May assemble the whole unit this week, and test it. It is just difficult to load it fully. How do I know if i overload the transformer?

author: ZeTeX
author_rank: Frequent Contributor
timestamp: October 09, 2016, 02:19:14 pm
content: you call that heavy?have a look at this one:

author: bktemp
author_rank: Super Contributor
timestamp: October 09, 2016, 02:23:29 pm
content: The short circuit current can easily reach several 100amps for most larger power transformers.Guessing from the secondary coil, the continous current is probably 20-50A, so 200-500VA.Did you wind the secondary yourself?You can easily test the continous power capability by loading the transformer and measuring its temperature. When it rises by more than 40°C, it is at its rated power. But do it slowly, because it can take hours until the temperature has settled.This is my heavy duty power supply: HP6260V: 0-10V, 0-100A.There is another row of two capactitors below the three ones. Under the control pcb is the heatsink with a large 120mm fan.The grey part of the transformer is the primary winding, the white/brown part the secondary. The secondary winding uses a large copper strip. Its resistance is less than 1mOhm.Only the transformer weights around 23kg. The small transformer on top is a microwave oven transformer.I estimated a short circuit current of over 2kA for this beast, drawing 300A on the primary side and dissipating 15kW.

author: cs.dk
author_rank: Unknown
timestamp: October 09, 2016, 02:31:14 pm
content: Quote from: bktemp on October 09, 2016, 02:23:29 pmNo I did not wind it, it is a 3-phase welding transformer chopped in to a 2-phase one. I don't know the weight, but is is heavy.I'll try measuring it, while it is assembled.Nice bit of kit you have there

author: nctnico
author_rank: Super Contributor
timestamp: October 09, 2016, 02:58:13 pm
content: I just hauled this one (20V 100A 2kW) from my bench to make room for the next project:Fortunately it is a switching PSU so it is relatively light (still 25kg or so).

author: whitevamp
author_rank: Regular Contributor
timestamp: October 09, 2016, 03:28:00 pm
content: I am getting ready to put together a 14 volt unloaded 30 amp power supply, the transformer came from a 1979 RV converter.

author: PA4TIM
author_rank: Super Contributor
timestamp: October 09, 2016, 04:56:33 pm
content: This is a RP-32e, almost 50 kilo, power-supply from a 1964 DDP24 mini computer made by the Computer Control Company.Pictures of the restauration:http://www.pa4tim.nl/?p=5464

author: lowimpedance
author_rank: Super Contributor
timestamp: October 10, 2016, 03:49:02 am
content: Okay I have a couple that I think qualify for middle - heavy !.number 1.This beasti is not that useful in its current configuration but has been in the back of the mind for a hack job into something that does not require liquid Helium......and a Super magnet......

author: lowimpedance
author_rank: Super Contributor
timestamp: October 10, 2016, 03:56:33 am
content: And number 2 is actually more useful as is(30V @30A)note the control electronics PCB is tucked underneath the mounting rail at the rear so not shown here.Not much info out there on this one unfortunately. but is pretty straight forward if something goes wrong.Just look for the burnt stuff.and of course being large PS they are.........bl@@dy heavy.

author: rollatorwieltje
author_rank: Unknown
timestamp: October 11, 2016, 08:37:44 pm
content: The one on the right is my biggest power supply, a 24V 10A unregulated DC transformer (Michael Riedel RNTU 240S). It's 6.3 kilogram. Technically it's DIN rail mountable, but I highly recommend using the screw flanges...Not the heaviest supply ever made, but enough to evaporate breadboard wires

author: Vgkid
author_rank: Super Contributor
timestamp: October 11, 2016, 09:49:27 pm
content: Quote from: lowimpedance on October 10, 2016, 03:49:02 amFrom what I have read, those supplies are bipolar. Some are even 4-quadrant.

author: bitseeker
author_rank: Super Contributor
timestamp: October 12, 2016, 12:34:38 am
content: The ones that I have are heavy on weight, watts or current, pick any two.HP 6032A: 60V, 50A, 1200W, 16.3 kg (36 lb.)Sorensen LHP 7.5-130: 7.5V, 130A, 975W, 6.4 kg (14 lb.)