Hi,
I have a bunch of 4ft. led shop lights purchased from a farm store that have severe radio interference. Seems like any weaker station gets wiped out if the lights are turned on. Very bad on 103.1 but also any weaker fm station. Didn't realize the problem until well after the purchase and also I really like the brightness of the lights and don't want to return them.
There are two banks of leds (110 in each row) - the 110 leds are grouped in 5 parallel banks of 22 leds in series. So there are actually 10 parallel banks of 22 leds in series.
There is a boost type power supply (see photo)which has a chip marked TP5060 and LHR4734. Looks like the ac is rectified and the filter cap is 68mf 200 volts. Dc output is 65 volts and that filter cap is 47mf 160 volts. I haven't been able to find any information on the chip. I'd like to see what the suggested circuit looks like and see if there is any reference to eliminating rfi or emi in the data sheet. I think it's safe to assume that the chip and entire circuit are Chinese.
I've tried wrapping the power cord (6 turns) through a mix 31 ferrite ring. Made no difference.
Anyone have any info on the chip or suggestions of circuit mods to eliminate the problem?
Couldn't focus well enough on the board to show the chip number.
Thanks,
Mike
I have a bunch of 4ft. led shop lights purchased from a farm store that have severe radio interference. Seems like any weaker station gets wiped out if the lights are turned on. Very bad on 103.1 but also any weaker fm station. Didn't realize the problem until well after the purchase and also I really like the brightness of the lights and don't want to return them.
There are two banks of leds (110 in each row) - the 110 leds are grouped in 5 parallel banks of 22 leds in series. So there are actually 10 parallel banks of 22 leds in series.
There is a boost type power supply (see photo)which has a chip marked TP5060 and LHR4734. Looks like the ac is rectified and the filter cap is 68mf 200 volts. Dc output is 65 volts and that filter cap is 47mf 160 volts. I haven't been able to find any information on the chip. I'd like to see what the suggested circuit looks like and see if there is any reference to eliminating rfi or emi in the data sheet. I think it's safe to assume that the chip and entire circuit are Chinese.
I've tried wrapping the power cord (6 turns) through a mix 31 ferrite ring. Made no difference.
Anyone have any info on the chip or suggestions of circuit mods to eliminate the problem?
Couldn't focus well enough on the board to show the chip number.
Thanks,
Mike
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