[Prev][Next][Index][Thread]
Re: SMPS high voltage
From: Geoff Schecht[SMTP:geoffs-at-onr-dot-com]
Sent: Friday, September 05, 1997 10:37 PM
To: Tesla List
Subject: Re: SMPS high voltage
Somebody already mentioned scavenging the flyback out of an old TV set.
Look for one from the days before they potted the PDA multiplier/filter
circuit in with everything else. That's a good way to go as long as the
scavengee is in operating condition. You'll have to build a driver for it
but that's not a big deal with MOSFETs oof the proper rating and some clamp
diodes to protect the switches from excessive Vds spikes.
Those plasma globes frequently have a "power" and a "focus" control, at
least mine does. Power relates to output voltage while "focus" seems to be
related to switching frequency. TV flybacks are designed to operate at
15750Hz but they can be varied over a range of frequencies as long as you
keep the core out of saturation (i.e. watch the volt-second rating of your
primary winding at lower frequencies).
Geoff
>
> From: Kenneth Aaron[SMTP:kennetha-at-geocities-dot-com]
> Sent: Friday, September 05, 1997 4:03 AM
> To: tesla-at-pupman-dot-com; hvlist-at-anchorage.ab.umd.edu
> Subject: SMPS high voltage
>
> I've been thinking about a high voltage low current SMPS to drive
> a TC or plasma globe...
>
> If you take a readymade switching power supply (these work at several
KHz,
> and rewire the transformer, to give a voltage of 20-50V spikes (if this
> is not present already), instead of the filter that gives DC, this could
> be put into the primary of a flyback transformer, to give very
> efficient AC high voltage .
>
> Comments anyone ?
> ----------------------------
> Kenneth Aaron
> E-mail : kennetha-at-geocities-dot-com
> http://www.geocities-dot-com/SunsetStrip/8736/
> ----------------------------
>
>
>