Hi All,
I have a question on snubber network to damp ringing in a transformer. I've seen most of the threads and articles trying to find the "optimal" value for snubber capacitor and resistance to obtain a "optimal" damping factor of the ringing (with RC snubber or CRC snubber). Why not to use a brute force approach and, given a capacitor value, find the maximum value of resistance allowed by power dissipation on the resistor itself of the RC series snubber network? Is there any drawback in this approach?
As an example and given the power dissipation formula of the resistor in this great article (http://www.hagtech.com/pdf/snubber.pdf), with a 0.1 uF capacitor and 70V RMS@120Hz on the output of the transformer secondary, the power dissipated on the resistor is:
P= R*(Vrms*2*3.14*f*C)^2 = (2.8E-5)*R
which gives me, for a 0.8W resistor:
R < 28K Ohm
which is much much bigger of the optimal values usually calculated (in the range of 100 ohms), and that will make for sure an over damped system. Not using a so big resistor, what if I use a 5K/10K ohm resistor? (I'm actually using 470 ohm resistor with quasi-unaudible buzz but still is there)
Thanks in advance for your responses and thanks to Mr.Pass for giving me the ideas and tools to enjoy diy audio. Should my question be stupid/non sense/obvious sorry for wasting your time.
I have a question on snubber network to damp ringing in a transformer. I've seen most of the threads and articles trying to find the "optimal" value for snubber capacitor and resistance to obtain a "optimal" damping factor of the ringing (with RC snubber or CRC snubber). Why not to use a brute force approach and, given a capacitor value, find the maximum value of resistance allowed by power dissipation on the resistor itself of the RC series snubber network? Is there any drawback in this approach?
As an example and given the power dissipation formula of the resistor in this great article (http://www.hagtech.com/pdf/snubber.pdf), with a 0.1 uF capacitor and 70V RMS@120Hz on the output of the transformer secondary, the power dissipated on the resistor is:
P= R*(Vrms*2*3.14*f*C)^2 = (2.8E-5)*R
which gives me, for a 0.8W resistor:
R < 28K Ohm
which is much much bigger of the optimal values usually calculated (in the range of 100 ohms), and that will make for sure an over damped system. Not using a so big resistor, what if I use a 5K/10K ohm resistor? (I'm actually using 470 ohm resistor with quasi-unaudible buzz but still is there)
Thanks in advance for your responses and thanks to Mr.Pass for giving me the ideas and tools to enjoy diy audio. Should my question be stupid/non sense/obvious sorry for wasting your time.