I would like to investigate the different 24VDC LED lighting distribution systems that are currently available on the market as we have to plan a large office building lighting system.
I simply cannot find the offerings which i know must be out there in this field. I wish to compare prices
Do you know of any 24VDC lighting systems.
Eg, Mains to the building, then power converter, then 24VDC distribution wires to the separate lamps.
Clearly its more efficient to do PFC in a centralised unit placed eg in the basement of the building, and then distribute DC to lamps from this point.
Theres also the advantage of easy interconnection with solar power.
Obviously one cannot use >24V as it creates too much contact sparking in connectors which wears them out unless they are very expensively made.
Hello,
I would like to investigate the different 24VDC LED lighting distribution systems that are currently available on the market as we have to plan a large office building lighting system.
I simply cannot find the offerings which i know must be out there in this field. I wish to compare prices
Do you know of any 24VDC lighting systems.
Eg, Mains to the building, then power converter, then 24VDC distribution wires to the separate lamps.
Clearly its more efficient to do PFC in a centralised unit placed eg in the basement of the building, and then distribute DC to lamps from this point. Theres also the advantage of easy interconnection with solar power.
Obviously one cannot use >24V as it creates too much contact sparking in connectors which wears them out unless they are very expensively made.
..yes, agreed , but let me expand, we will have enough PFC'd "power hubs" near each group of lamps so that we dont have long low voltage cable runs.I think the IR losses are to high for a large scale system at low voltage.
Agreed, they would be bulbs with smps led drivers in them, which run off the 24Vyou would need to have special bulbs without PFC correction
....Solar panels provide you with low voltage DC which you use to charge a low voltage battery......this could then be stepped up and fed to the 24VDC distribution bus, being diode or'd into it.With standard AC distribution solar takes place in the normal manner.
sure, we debated over having a 200VDC bus and putting FET based circuitry in the bulbs to quell any contact sparking, but in the end it works out simple and cheaper to go for 24VDC , and use the multitude of available switches at that voltage level.......and we just need to put a power hub near to each cluster of 24V bulbs, so that cable runs at low voltage are not long.And mosfets switch HV DC just fine
yes, agreed , but let me expand, we will have enough PFC'd "power hubs" near each group of lamps so that we dont have long low voltage cable runs.
Agreed, they would be bulbs with smps led drivers in them, which run off the 24V
....Solar panels provide you with low voltage DC which you use to charge a low voltage battery......this could then be stepped up and fed to the 24VDC distribution bus, being diode or'd into it.
....if the low voltage DC in the batteries was to be converted to 230VAC mains, then thats far more inefficient and expensive.
yes but then the cable runs would be too long and too much i^2r loss...unless you do HVDC distribution and put spark contact circuitry in each bulb.Clearly its more efficient to do PFC in a centralised unit placed eg in the basement of the building, and then distribute DC to lamps from this point.
Valley fill is only about 80% PFC, so its more losses in the power system.So once you put an IC inside the bulb PFC is only 3 diodes and 2 capacitors away
..Do they have to be close?...why ?....ok there'll be i^2r losses if theyre not close but who cares?.....solar is free energy from the sun so we tolerate the i^2r loss.Now you have little step down supplies for power hubs closer to the lamps so you must have batteries close to them so the solar power must be distributed to each one?????
..if you search for switchs above 24V you will see how there are so few above 24V, and so many below 24V....24V is the demarkation point, where contact sparking damage gets too bad with DC.As far as switching DC goes once again it's not a problem over 24 volts. It's done all the time so I don't know where you are getting your reasoning and logic from over it?
.if you search for switchs above 24V you will see how there are so few above 24V, and so many below 24V....24V is the demarkation point, where contact sparking damage gets too bad with DC.
Dont forget i am talking DC.
you can get high voltage dc contactors etc, but the point is that they are far more expensive than sub 24V switchesWell I must live in a very special part of the world and do very special electrical work because I have loads of DC switches, relays, breakers, and contactors designed for 12, 24, 48, 100, 110 and 250 VDC nominal voltages and everyone of them is to me a common off the shelf item in my lines of service work
12V (27)
14V (10)
20V (27)
24V (54)
28V (83)
30V (6)
35V (1)
72V (1)
125V (4)
250V (1)
You can do that with mains voltage lighting too, so the 24DC system has no clear advantage for that featureyou dont have to have a whole room bathed in light...you can just (very easily) shift the light to that particular spot where its needed at that particular time
You can do that with mains voltage lighting too, so the 24DC system has no clear advantage for that feature
The JLS system has 24VDC distribution with "self sealing" contactsAs far as exposed live wires go I am rather sure the electrical code books did away with that concept some 70 - 80 years ago when the old 32 VDC systems started getting phased out.
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