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OK, Thanks for these replies.

Hello, thankyou for replying...here is a simplified diagram of the circuit...... The idea is eventually to do this at 240V mains. ...Also, to vary the frequency (of the PIC oscillator) as the input volts rise so as to avoid the incidence of sudden high peaks of current being drawn from the...

Hi, I have just built a 16V output flyback which is fed from a 36V mains transformer. Unfortunately the output volts suffer a dip in output voltage of 2V......this happens usually about every 100ms or so.....the output volts are ok inbetween these events. ..When the output volts fall, it goes...

Hello, My 36V 100VA mains transformer is a discontinued part (B19618F/1) and i cannot get the leakage inductance figures for it. It is from the following family.. http://www.oep.co.uk/100VAChassisMountingDualPrimaryTransformer-pageprodDet-ID45.aspx I doubted that it's leakage inductance...

Hi The inductor was just an off the shelf one.......this was part of a pseudo-PFC one transitor forward converter i was doing which i now know wouldnt have worked as the pulses of current drawn by such a converter cannot be passed by the supply inductance.....you can mitigate it by adding AC...

Hello I just put a 30uF AC capacitor on the output of the secondary of my 36V transformer and now my circuit works. -I think this is proof that it was the line inductance...as seen looking back through my transformer's secondary which was causing me the problem. ....BTW, when i put just 1uF...

Thankyou for these replies. If i could expand a little, i have recently been (trying to) play with a PWM controller chip. -Using variable frequency as the (non-capacitively smoothed) rectified input line went up and down. -But i have been working off of a 36V AC RMS Mains transformer just to...

Hello, I am designing an offline Power factor corrected SMPS (continuous mode boost converter at front). Since it is mains powered, i am worried how i will be able to draw the PFC's high frquency pulse currents through the Line Inductance. (That line inductace being the inductance of the power...

Apologies for missing letters out of the first post, this keyboard is well past it. Anyway, I am thinking about using less capacitance at the output of my FWB, but know that this will increase the amount that the line input goes up and down......so i want to check that with this increased input...

Hi, I read the theories with interest....but think of a common mode choke at the input of a switch mode power supply........ ...That is a transformer, but since the Hot & Neutral are effectively "differential" lines, then which is the primary and which the secondary? ....And which coil is it...

I am using a one transistor forward converter......i am worried that my input line voltage is varying some 20% ...So if i have the secondary inductor current going up and down by the same amount at one input voltage...then when this input line voltage rises the secondary inductor current will...