Re: New High voltage Replacement for 6100

Zonn,

    Without basically giving the schematics out it is hard to tell you
exactly how this works. It is a pretty straight forward design though.

You answered your own question with this -

Are there two flyback switchers. One that generates the 180v needed for the
B+,
> and then another flyback design that generates the 19.5k based on the 180
volt
> primary?

 If so, how is the 19.5kv regulated

This is the tricky part of the whole design, but I basically have a circuit
that changes the pulse width on the hot to regulate the 19.5KVH.

Fred

----- Original Message -----
From: "Zonn" <zonn@zonn.com>
To: <vectorlist@synthcom.com>
Sent: Saturday, April 12, 2003 12:42 AM
Subject: Re: VECTOR: New High voltage Replacement for 6100

> On Fri, 11 Apr 2003 19:27:03 -0500, "Jilayne Stanclif"
<jstancliff@mchsi.com>
> wrote:
>
> >I bet you are :)
> >
> >It is regulated very well. Most of the regulation is in the Switching
power
> >Supply portion. That is the B+ is well regulated (and the color voltages)
by
> >sampling itself.
>
> This is pretty typical, most HV regulators regulate the HV, by regulating
the
> voltage used to drive the flyback, based on the B+ voltage coming out of
the
> flyback's B+ winding.
>
> >The HV voltage section runs in Discontinuous Mode so it has
> >a tendency to regulate itself.
>
> Well, I don't know about "regulate itself" but it should follow the B+
pretty
> well (assuming the B+ is generated by a winding on the same flyback
transformer
> as the HV is), and once again this is just about all HV works, and seems a
> decent design.
>
> >I tested this extensively on a Star Wars and
> >other games. The only Game that shows any Blooming is Star wars death
Star
> >explosion and its better then the original.
>
>
> >If you really want to know the Skinny-
> >
> >It uses a Flyback switching power supply design for the B+ and color guns
> >and of coarse the HV Flyback for the High voltage. The Switching Power
> >supply samples itself to regulate and a winding of the flyback is sampled
to
> >watch for Over voltage.
>
> I'm a little confused by this second email.
>
> Is the B+ being generated by a winding of the Flyback, which is shared by
the HV
> winding like in a normal (think WG6101) design? This would mean one
inductor
> (the Flyback) is responsible for generating both the B+ and HV voltages.
>
> Or,
>
> Are there two flyback switchers. One that generates the 180v needed for
the B+,
> and then another flyback design that generates the 19.5k based on the 180
volt
> primary? If so, how is the 19.5kv regulated?
>
> And, when you say "watch for overvoltage", does this imply a secondary HV
> protection circuit (like the standard SCR crowbar circuit used in most HV
> designs) to clamp an out of control HV?
>
> Just curious as I have an HV module in my Tempest right now that while the
HV is
> present, and the screen is nice and bright, it obviously is not regulating
well
> (the screen size changes noticeably based on the number of vectors drawn.)
The
> discrete regulator used in the WG6101 has a real strong tendency to become
a
> wire, with no regulation, and I think this is what happened. A reliable
> replacement for this would be real cool.
>
> On the other hand when a WG6101 HV module is working correctly, the
vectors are
> rock solid (better than the Amplifone HV), with very little movement based
on
> changing colors or number of vectors drawn.
>
> If you can make a reliable HV, that regulates like a properly working
WG6101 HV,
> I'd even replace the Wintrons in my Amplifones with it.
>
> -Zonn
>
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Received on Sat Apr 12 21:28:09 2003