Re: TC Criticall Coupling (was Overcoupling?)

• To: tesla-at-pupman-dot-com
• Subject: Re: TC Criticall Coupling (was Overcoupling?)
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 09 May 1999 22:45:30 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi John,
          I'd be happy to explain...
          
> Original Poster: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net> 
> 
> 
>   Malcolm -
> 
>   What was the "K" coupling at 90% efficiency? Did you make any other
> coupling vs efficiency measurements?

Other coils I've measured also do considerably better than 50%. You 
can measure the amplitude differences between two successive 
secondary maximums and calculate the energy loss as a percentage
of total initial energy for two transfers which when divided by two, 
gives a close figure for the power loss for a single transfer.

>   Are you saying that equal amounts of energy are lost in the TC rimary and
> secondary circuits at critical coupling (50% eff)? Please explain.
> 
>   John Couture

Yes. Terman is referring not to capacitive discharge coupled circuits 
but to circuits where steady-state impedances are present on both 
windings (e.g. the IF transformer in a radio set). In an IF 
transformer, there is a steady power transfer from one fixed 
impedance to another whereas in a TC, the transfer is a transient 
one. Additionally, the secondary impedances change markedly with the 
onset of a discharge.

Malcolm
<snip>

• Prev: Re: flat strip primary
• Next: Re: How to INCREASE leakage inductance
• Index(es):
  • Main
  • Thread