what does capacitor in cfl do
Audioguru, thankyou for your replying
FvM:- Thankyou i appreciate your reply.....
please may i speak again regarding this capacitors rms current....as this is an area of mystic qualities to myself.
Looking at the capacitors voltage waveform, and considering the bit where it goes from 220V to 330V (charging) i calculated the charging current during this interval using i = Cdv/dt
...i then integrated the square of this over pi radians and took the root of the answer to give the RMS of the charging current.
Is this an incorrect methodology to calculate the RMS value of the charging current into this cap ?
When the cap voltage gets to about 330V (the peak), the cap is then discharged by the switching converter which also exists in this bulb.
...This discharge current will then add to the charging current, to give the proper full value of capacitor RMS current, which i am taking as the ripple current experienced by this cap.
.....As i stated above, the charging current alone comes out at 82mA.
...So when i include the discharging current as well it will surely take the total over 100mA,(?) and violate the ripple current rating of this cap ?
Added after 1 hours 44 minutes:
sorry to reply again...
in fact , i would be most grateful if readers could peruse these waveforms representative of the cap voltage and current
This image shows what this caps voltage (green) and current (blue) would look like...
This shows roughly what the capacitor voltage looks like on its own ........
This shows what the capacitor current looks like on its own....
Regarding the current waveform, due to its complex from, is it true that the only way to calculate its RMS value would be to do a piecewise integration ?