Power Supplies: Difference between revisions
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|style="background:#FBEC5D; color:black"| Connects to the Neutral side of 115VAC power cord (White wire) | |style="background:#FBEC5D; color:black"| Connects to the Neutral side of 115VAC power cord (White wire) | ||
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|style="background:#AFEEEE; color:black"| '''Gnd - Ground ''' | |style="background:#AFEEEE; color:black"| '''Gnd - Ground - '''[[File:200px-Earth Ground.png|25px]] | ||
|style="background:#FBEC5D; color:black"| Connects to the Ground wire of 115VAC power cord (Green wire) | |style="background:#FBEC5D; color:black"| Connects to the Ground wire of 115VAC power cord (Green wire) | ||
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Revision as of 05:01, 25 June 2013
Intro
When your working with pixels or any type of led, they will be run on DC voltage. To do that you will need to run some sort of power supply. There are many types you can use. A power supply converts high voltage AC power from your wall outlet (commonly 115VAC in North America) to a lower voltage DC current to drive your pixels. Common voltages used by pixels are:
- 5VDC
- 12VDC
You need to choose your power supply based on the voltage required by your pixels and the current that is consumed by the pixels. Voltage, Current and Resistance are electrical properties of electronic circuits that are related to each other by Ohm's Law.
Disclaimers
The standard disclaimers pertaining to the information contained on this wiki page are listed here.
THIS WIKI PAGE IS NOT COMPLETE YET AND HAS NOT BEEN CHECKED FOR ERRORS.
Power Supply Voltages
With 5v the voltage drop will be noticeable if your trying to push the voltage for a long run. Most likely you will need to inject the power again or feed from the center of the pixel string. For every 50 pixels, you should re-inject the power. So a good example, if you have a 100ct pixels string you can connect the signal wires end to end, but you will either have to put the power at the center of the string to feed each side. Or you will have to put a power source on either end. A 50ct pixel string will pull around 3amp (50x.06=3amp). So really finding smaller power supplies is a good thing to have if you have your pixels spread around the yard. If you have like a pixel megatree then you can do a large power supply to feed the whole tree. So bigger is not always better esp if your not power alot of pixels close by.
12 volt is a bit different. You can push 12v further than 5v. So that does have its advantages and disadvantages. Most pixels strings are only 5v. There are some that are starting to 12v but it may be a bit before more start to come out. So 12v is alot nicer but not as many options.
Waterproof Power Supplies
Waterproof power supplies are really nice in the sense that you do not have to really worry about moisture as much as a non waterproofed power supply. Before placing a "waterproof" power supply in a weather exposed area, check it's IP rating to determine what level of protection is required. You should still put it in some sort of shelter just to be safe. These are a little more pricey than a standard switch mode power supply but alot less headache. They come in a variety of sizes so you will have to choose what will work best for you.
It is common to use waterproof power supplies with waterproof connections.
Examples of Non Waterproof Power Supplies available from different vendors
Vendor | Type | Input Voltage | Output Voltage | Output Current | Link | Image | Price | Price per Amp | Size (HxWxL) | Note |
---|---|---|---|---|---|---|---|---|---|---|
5VDC | ||||||||||
DIYLEDEXPRESS | 60W Waterproof Switching Mode | 90-130VAC | 5VDC | 12A | link | $20.75 | $1.73 | 45mm x 67mm x 175mm | Cable;VDE BVVB,200MM Long | |
Ray Wu | 60W Waterproof Switching Mode | 90-250 VAC | 5VDC | 12A | link | $12.63 | $1.05 | 45mm x 67mm x 175mm | IP68 | |
12VDC | ||||||||||
Holiday Coro | 45W Waterproof Switching Mode | 100-130 VAC | 12VDC | 3.75A | link | $12.39 | $3.30 | 1"x1.2"x9.7" | IP67 | |
Ray Wu | 60W Waterproof Switching Mode | 85 - 264 VAC | 12VDC | 5A | link | $12.63 | $2.53 | 45mm x 67mm x 175mm | IP68 | |
24VDC | ||||||||||
DIYLEDEXPRESS | 100W Waterproof Switching Mode | 110 VAC | 24VDC | 4A | link | $28.75 | $7.19 | 45mm x 67mm x 210mm | IP68 |
Non Waterproof Power Supplies
Since they are not rated as waterproof, you must use these supply in some form of enclosure if you want to use these outside to power your DC LEDs. There are many types of Enclosures that you can mount your power supply inside of including the [CG-1500] provide a large enclosure that you can mount both a power supply and a controller inside of. Most of the supplies have a small adjustment potentiometer that you can use to adjust the voltage output slightly.
Examples of Non Waterproof Power Supplies available from different vendors
Vendor | Type | Input Voltage | Output Voltage | Output Current | Link | Image | Price | Price per Amp | Size (HxWxL) | Note |
---|---|---|---|---|---|---|---|---|---|---|
5VDC | ||||||||||
DIYLEDEXPRESS | 300W Switching Mode | 100V~120 VAC | 5VDC | 60A | link | $27.75 | $0.46 | 49mm x 114mm x 226mm | Fan Cooled | |
Holiday Coro | 350W Switching Mode | 100-130 VAC | 5VDC | 60A | link | $32.95 | $0.55 | 2"x4.5"x8.5" | Fan Cooled | |
Ray Wu | 350W Switching Mode | 85 - 264 VAC | 5VDC | 60A | link | $20.00 | $0.33 | 50mmx115mmx215mm | Fan Cooled | |
12VDC | ||||||||||
DIYLEDEXPRESS | 360W Switching Mode | 100V~120 VAC | 12VDC | 30A | link | $27.75 | $0.93 | 50mm x 112mm x 214mm | Fan Cooled | |
Holiday Coro | 350W Switching Mode | 100-130 VAC | 12VDC | 29A | link | $29.95 | $1.03 | 2"x4.5"x8.5" | Fan Cooled | |
Ray Wu | 350W Switching Mode | 85 - 264 VAC | 12VDC | 29A | link | $20.00 | $0.69 | 50mm x 115mm x 215mm | Fan Cooled | |
24VDC | ||||||||||
DIYLEDEXPRESS | 200W Switching Mode | 100V~120 VAC | 24VDC | 8A | link | $28.00 | $3.50 | 50mm x 112mm x 214mm | Fan Cooled |
Converting ATX Power Supply
One common low cost way to generate +5VDC and +12VDC is to convert an old used PC power supply that you have salvaged from an unused PC. There are numerous plans available on the internet showing you how to convert them.For more information see:
Wall Warts
Wall warts are not the greatest to try to run pixels off of. First off most are too small to supply enough amperage. Also they do not supply very clean power to the pixels. Your best bet is to stay way from these.
Power Supply Connections
Power supplies generally have screw terminals or wires from the power supply that you can connect to your controllers.
Fuses
Due to the very high current that many power supplies are capable of putting out (>60A) it is a good idea to use a heavy guage wire fuse holder between the power supply and the controller hookup. The large gauge wire will minimize any voltage drop that may occur in the wire due to high current. It is common to use 12-14ga wire to connect power supplies with pixel controllers. Mouser.com carries several inline fuseholder that take automotive style fuses such as part number 441-R347A-GR that has 12 ga wire and can use up to 30A ATC style fuse, or part number 441-R347B-GR that has 14ga wire and can use up to a 20A ATC style fuse.
Wire Sizing in Pixel Systems
It is desirable to use the largest wire diameter (smaller wire gauge) that you can when connecting your pixels to your controller. The smaller wire gauge results in a high voltage drop and can cause your pixels to have poor colors or to not function at all. The voltage drop is caused by the resistance in the wire and is calculated by Ohm's Law. This is a good thread that discusses voltage drop.
This is a Voltage Drop Calculator useful for calculating the effects of different wire sizes and lengths on pixel strings.