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MEXICOWANDERER's avatar
MEXICOWANDERER
Explorer
Aug 06, 2014

AC Powered LED Power Supply Design (??)

Noise question.

I am building modular AC (and DC) powered 33 volt LED lamps for various uses.

Area of Question: Where to located switching power supply? In the circuit.

Reason: Noise, electrical type.

Can I use a braided shielded duplex wire between the power supply driver and the lamp?

I would like to locate the driver in a well ventilated bay then run the duplex wire to the lamp module. Weatherpack connector or one of those RC connectors. Easy to disassemble and store.

I am going to carry the AC driver like I just posted a link to, or a boost DC to DC module (I think I posted a link awhile back on that one). Universal connector on the lamp module.

HOWEVER!

I've read comments on the forum about regulated LED lights being so noisy electrically that they caused real problems with other devices. I am trying to cut corners here in the trial-and-error department :)

Thank you!
  • SteveAE's avatar
    SteveAE
    Explorer
    Aug 07, 2014
    I doubt the FM, TV and VHF will be adversely affected. AM very likely and probably any HF ham stuff could be though.
    Think of your plan of action to involve two different types of signals; radiated and conducted.
    Some thoughts:
    - Operate on separate power supply (i.e.; battery) from your RV if possible.
    - Turn it off when interference is present.
    - Try to shield the device, all openings, and wires.
    - Use a separate ground (from your RV ground) for all shields and grounds. Keep power supply ground separate.
    - Use (multiple) ferrite beads on all wires. May need to add tuned filters if you can identify the frequency.
    - Keep all wiring short.
    - Be prepared to modify your device and move wires around.
    - Best suggestion (IMO), build it and see what happens.

    I have been fighting RFI from my refrigerator module for a while now. There is no magic fix.

    I hope this is some help.

    Good luck,
    Steve
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Aug 06, 2014
    AM, FM, TV (not digital yet down here) VHF Marine, occasionally someone will show up with a H.A.M. inside their rig. I don't want to rain on anyone's parade. Thank you for responding. I am hoping shielded wire would work. I can make Faraday cages for the drivers.
  • SteveAE's avatar
    SteveAE
    Explorer
    Aug 06, 2014
    What type of devices (i.e.; radio's) are you trying to protect from noise?

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