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Re: HV & ballasts
Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>
Tesla list wrote:
> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> So... Doing a bit of research on magnetic ballasts, it appears that there
> may be a huge supply of these...There's a federal law mandating replacement
> of old style ballasts...
Improved efficiency, some older may have PCBs.
> Anyone know what the internal circuitry looks like?
They come in many styles, sizes, etc.
The basic one Just An Inductor.
> I suspect they have a capacitor in them for PFC.
I suspect not, mostly. Never checked. But. The simple
ballast is connected in series with the tube, so No Way
to connect a PFC cap. (If placed in parallel with
inductor: defeats purpose of inductor....)
> How does the rapid start thing work (HV pulse to strike the
The ones i used to sort of understand had a cap, to make
a resonant circuit. Once the tube struck, the load
current shifted the inductance value enough to kill
the resonance. Or close to that.