Solving Harmonics ?

[gar]

160207-2212 EST

Throughout the day I have played with three or four bulbs.

By tonight the Feit is not as bad as early today. Appears to be temperature sensitive. At one point after being off for a long time there was no about 1000 kHz oscilation. After being on for a while it starts to grow.

Following are several plots from the Rigol scope. One major vertical division is 0.2 A, horizontal is 2 mS per major divison.

Feit:




Tonight the Feit oscillation is smaller and moved up to about 1100 kHz


Cree:




Note: the Cree current is very close to a sine wave and in phase with the voltage.


25 W incandescent:




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My point about the YouTube video was that it tends to imply that all LED bulbs are major harmonic sources. Our government is trying to require equipment to have reduced harmonic content in the load current. There is good reason for this when you see the considerable peak voltage waveform distortion. We need the existing power distribution system to be able to handle an increased power load without having to unnecessarily build additional lines.

And also the video time domain current waveforms did not look correct for what one would expect.

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[Jraef]

That first one is one of the most bizarre waveforms I've ever seen! Looks like a little Space Invader* in the middle of each wave.

* Dated video game reference...

 

[gar]

160208-1519 EST

Additional comments.

Using a Kill-A-Watt EZ for measurements:

25 W Incandescent
123.4 V, 0.20 A, 25.2 W, 25.2 VA, 1.00 PF

Old CFL
123.4 V, 0.16 A, 13.3 W, 20.1 VA, 0.65 PF

Feit LED with no oscillation
123.4 V, 0.09 A,, 9.0 W, 11.4 VA, 0.79 PF

Cree LED these have never shown oscillation
123.4 V, 0.08 A,, 9.8 W,, 9.8 VA, 0.99 PF


In past times I have looked at the waveforms of CFLs and LEDs. CFL currents were peaked, while the LEDs were relatively sinusoidial until I encountered this Feit bulb.


A small CFL plot.

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The Feit LED with no oscillation.






The following Feit waveform has more oscillation and the 60 Hz voltage has obvious fuzzy voltage peaks. The internal inductive impedance of the wiring to the outlet where the test is being performed allows the bulb oscillator to produce a substantial high frequency, 1000 kHz, voltage change on the 60 Hz voltage peaks.




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