Is two bench power supplyes isolated? - Page 1
Forum section: electronics / beginners

author: ElectricPower
author_rank: Frequent Contributor
timestamp: July 29, 2022, 03:15:47 pm
content: I have two Riden 6006 power supplyes connected to mains AC. Can i power two different circuits with different voltages on a breadboard that is fully isolated from each other?

author: bob91343
author_rank: Super Contributor
timestamp: July 29, 2022, 04:54:24 pm
content: Yes.

author: TimFox
author_rank: Super Contributor
timestamp: July 29, 2022, 04:58:51 pm
content: The only limitation is that the two terminals of each power supply have a maximum voltage rating to chassis ground, specified by the manufacturer.(That is determined by the insulation rating on the power transformer and the voltage capability of the construction and connectors.)That should not matter to a low-voltage circuit using a solderless breadboard.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: July 29, 2022, 07:50:37 pm
content: With normal lab bench power supplies, you can put them always in series, to get a higher voltage (often with a safety limit of a few hundred volts), and often they can also be put parallel (with current limiting).With this Riden 6006 it's more difficult to predict.I'm not entirely sure, but I think the "front panel module" is a buck (or buck-boost) converter. This means there is no electric isolation between it's input and output. But there is also a fixed voltage power supply between the mains voltage and the input of the Riden module, and such power supplies nearly always have galvanic isolation between their input and their output. This is also (or at least should be, (you never know with cheap stuff these days) a fairly strong barrier. I think 1.5kV or 2kV isolation is mantatory between mains circuits and secondary low voltages, and the Riden module just depends for this on whatever module is put put in front of it for this isolation.

author: BrokenYugo
author_rank: Super Contributor
timestamp: July 29, 2022, 08:22:38 pm
content: The 6006 is not a complete PSU, it's a DC-DC buck (so not isolated) regulator module, any isolation is in the AC-DC supply ahead of them. If they share a AC-DC supply they are not isolated from each other. They are possibly not isolated from earth (depends on the supply), and possibly not isolated from mains all that well if they're powered by one of those cheap industrial supplies that are full of recycled parts, Mean Well is about as cheap as those go legitimately.

author: TimFox
author_rank: Super Contributor
timestamp: July 29, 2022, 08:25:42 pm
content: To the original poster: you wrote that the two 6006s were powered from AC mains. How are they connected to the AC source?

author: ElectricPower
author_rank: Frequent Contributor
timestamp: July 30, 2022, 02:13:51 am
content: Quote from: TimFox on July 29, 2022, 08:25:42 pmEach Riden 6006 has an own internal power supply that are connected to mains with a 3 pin AC socket on the box. The DC output from the power supply is connected to the 6006 buck unit.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: July 31, 2022, 10:35:37 am
content: I measured resistance between two DC outputs ground from two power supplyes and i get 45 Mohm.I guess i can say that it is isolated then?