"3 to 4 RF cycles" is how many RF cycles there are in 50us at the
frequency he was operating at. So working backwards, he was probably
between 60-80kHz. The "3 to 4" is because the driver will shut off at
the next nearest zero current crossing to avoid hard switching.
On Tue, May 4, 2021 at 7:41 PM shaun <snoggle@xxxxxxxxxxxxxx> wrote:
>
>
>
> I was reading the stuff below from loneocean and highlighted part of it. I
> understand the 50us for the pulse width because there is a control for it.
> What is this 3 to 4 RF cycles and where is it controlled as I only see BPS
> and On time on most interrupters. Thanks
>
>
>
> First testing was carried out on 6th Feb with an isolated power supply at
> 60VDC into the bus limited at 3A. The pulse width was set for a maximum of
> 50us+ (3 to 4 RF cycles). The coil responded well, producing a clean buzzing
> sound you'd expect from a tesla coil, and produced it's first 2-3" spark to
> ground at low power! This started interfering with some other electronic
> equipment including the power supply (all was fine) as well as the
> telephones in the workshop(!), so next up will be power testing from a large
> variac in a suitable space.
>
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--
andy
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