Re: PWM Controller question

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

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

This small feedback signal was a very basic attempt at allowing the system
to maintain constant tune even under longer arcs and
is basically inferior compared to the self-resonant topologies in use today.
This small feedback idea was one of Richie Burnett's and it does work to
some extent.

Dan


 > Dan, or anyone else that might know the answer.
 >
 > Looking at your PlasmaSonic SSTC design,
 > more specifically the TL494 PWM Controller.
 > You have a feedback signal from the positive rail able to change the
 > frequency the circuit oscillates at, could you explain what the overall
goal
 > of that would be ?
 > I wanted to use the same controller IC, but drive an H bridge of tubes,
this
 > will make my positive rail in the thousand rather than hundred volt range,
 > so the value of R27 thru R30 will be adjusted.
 > Just don't understand the need to have the frequency change with the power
.
 > . .
 >
 > Thanks,
 > Phil
 >
 >
 >
 >
 >