From: Marco Denicolai
Date: Fri, 01 Jun 2001 13:54:01 +0300
Subject: Re: [TSSP] Secondary in motion
Paul wrote: > > Marco Denicolai wrote: > > > Terry (or Paul), would you mind sending me the values of > > Ces and Les of the coil we are talking about? > > For the secondary with primary in place but open circuit, I get > > f1 = 244.5 kHz, > Ces = 22.6 pF > Les = 18.7 mH > > For the primary alone, ie secondary removed altogether, I get > > Lp = 15.6 uH > Cp = 27.16 nF > f = 244.5 kHz > > The above Cp is a little different to Terry's actual 27.7 nF - I > fiddled my value slightly to set the primary Fres to match the > secondary. > > Now, when the system is put together, I get the main mode frequencies, > > f- = 209.0 kHz > f+ = 299.9 kHz > > Terry's measured primary values are, > > Lp = 15.575 uH > Cp = 27.7 nF > f = 242.31 kHz > > and for the secondary, > > f1 = 252.91 kHz > And with my maths (classical lumped theory, but using Ces and Les) I get: f1 uncoupled (Hz): 244508 f2 uncoupled (Hz): 244819 Tuning ratio: 0.997 f1 coupled (Hz): 210572 f2 coupled (Hz): 303468 Resulting HF beat (Hz): 257020 Resulting LF beat (Hz): 46448 I still can't figure out what that 218 kHz Terry measured is... Cheers -- _____________________________________________________________ Marco Denicolai Senior Design Engineer Tellabs Oy tel: +358 9 4131 2769 DSL Products mobile: +358 50 353 9468 Sinikalliontie 7 fax: +358 9 4131 2410 02630 Espoo FINLAND email: marco.denicolai@tellabs.com _____________________________________________________________
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.