Re: Recent s.s.t.c work

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>

Hi,


> Original poster: Steve Conner <steve@xxxxxxxxxxxx>
snip
>
> The answer is that zero-current switching allows the IGBTs to work
> much more efficiently- the switching losses are reduced by about a
> factor of 5. It may also allow them to stand overloads better. It
> seems that most IGBTs can carry more current than they can switch,
> due to dynamic latchup.
>
> Steve Conner

Not only is primary zero current switching nice to the switches. It ensures
that all the switched power gets in to the primary (if the coupling and
tuning are right most of it will end up in the secondary) compared to the
non zero current switching case when for part of the cycle the power is
flowing back in to the power supply. No matter how the frequency shifts from
streamer loading, transients or what ever, the power is pumped in to the
secondary (assuming the switching phase is correct) and with minimum
switching losses.

You also have decoupling from the transients of the streamer loading.


Robert (R. A.) Jones
A1 Accounting, Inc., Fl
407 649 6400