badboy_6120
Member
View attachment 5616View attachment 5617View attachment 5618I have 2x680uF in series at primary (eqivalent 340uF).
Trafo ratio is n=3. The secondary side capactance is 4x1000uF (2000uF per rail).
I am getting ripple at secodary side exacly 2.8Vp-p.
After adding another 2 caps 1000uF/200V at each rail (i have 840uF equivalent capacity at primary side), I am getting around 2,45Vp-p ripple at secondary (measured from V- rail to V+ rail).
badboy --> that is why I am so surprised that you have only around 100mV ripple at secondary (screanshoot no6 50mV/div).
I must do some more investigation at my board.
for screenshots number 1 to 3 I set oscilloscope in 50X mode (10X switch on the probe and 5X on the oscilloscope) and I forgot to set it back for screenshot no6 (50mV/div)
So with 540W load I have 4V p-p ripple not 100mv
8x0.2x5x10x50x10^-3 = 4V