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Registered Member #4107
Joined: Sun Sept 25 2011, 07:30PM
Location: London
Posts: 53
Hi all,
I’m looking for approximations of secondary coil self-capacitance. I note that even a few pFs wildly lowers self-resonant frequency.
My secondary has inductance of 27mH (theoretical)
I’m trying to decide whether to stick with a full bridge of 4 x TO-247 devices ( Fairchild FGH75N60UFTU) or use a large toroid and get the operating frequency down to around 120KHz to switch with CM300s.
It will be a lot easier to complete the physical build but has spending implications ... budget creeping !
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
you may have already found your answer but mesure the inductance at 1khz and then find the resonant frequency and solve for capacitance. as far as a big toride bogger is better because it will become the dominant capacitance and not disributive capacitance, ditributive capacitance is in paralell with your secondary inductance and a toride is series capacitance with secondary inductance witch is what you want.
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Approx self-capacitance of secondary coil (DRSSTC build )
