Re: SRSG break rate

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Steve,

On 21 Jun 01, at 7:49, Tesla list wrote:

> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>
> 
> I have been following the posts on SRSG break rates. Some people seem to
think
> 100 BPS (50 HZ) or 120 BPS (60 HZ) is best. It seems to me that 200 BPS
(50 HZ)
> or 240 BPS (60 HZ) would be optimum. Here is why I think this. If you
examine a
> single cycle of sine wave, there are 4 positions of maximum charging for a
> capacitor. During the first 1/4 cycle (starting at 0 degrees), the cap would
> reach its peak charge at about the 90 degree point of the sine wave. At this
> point the cap should be discharged. Continuing to charge the cap past 90
> degrees without discharge would not charge the cap any further because the
> voltage is now decreasing towards 0 at the 180 degree point.

At this point, the cap is now empty, some energy is stored in the 
ballast inductance (not a lot) and the transformer is still supplying 
power between 90 and 180 degrees. Do you still consider your last 
statement to be valid?

Regards,
malcolm

 After discharging
> at the 90 degree point, the charge cycle can begin again at the peak voltage
> and continue charging until the 180 degree point is reached. At this
point, the
> cap should again be discharged because after the 180 degree point, the
voltage
> will go negative and the cap will not reach any higher charge. 2 more
discharge
> points can be identified for the negative voltage at the 270 and 360 degree
> positions. This reasoning assumes that the transformer can supply sufficient
> current to fully charge the cap in 1/4 cycle. If not, then higher break rates
> may be better.
> 
> 
> 
>