Peter,
Take a peak here (scroll down to the graphs):
http://dsp.stackexchange.com/questions/5959/add-odd-even-harmonics-to-signal
The full-wave rectifier creates a symmetric distortion, which causes
even harmonics. Each half-cycle has the same output structure, so the
resulting signal has twice the frequency of the input. The sawtooth
slope as the capacitor discharge has in itself both even and odd
overtones, creating the end result of 100 Hz, 200 Hz, 300 Hz etc.
We can expect leakage of the 50 Hz and some harmonics on that, due to
inbalance between diodes and other paths.
Cheers,
Magnus
On 09/18/2016 01:11 PM, Peter Marczinowski wrote:
Even harmonics are caused by asymmetrical nonlinearities, odd harmonics
by symmetrical nonlinearities.
Peter
Am Sonntag, 18. September 2016 schrieb Magnus Danielson :
Hi,
On 09/18/2016 12:26 PM, David C. Partridge wrote:
The local power is 50Hz, so I can understand the 100Hz spurs,
but I don't
quite "get" where the 200Hz spurs are coming from. Or is that
just BAU
harmonics?
Consider full-wave rectification of 50 Hz, the power consumption
load on the capacitor after the rectifier creates an inverse
sawtooth wave of 100 Hz, and sawtooth waveshape have both even and
odd harmonics.
While much of this is regulated out in the next step, some of it
makes it though.
Cheers,
Magnus
Thanks
Dave
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