Re: 600V supply (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 21 Jul 2004 11:08:23 -0600
From: Hydrogen18 <hydrogen18@xxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: 600V supply (fwd)

I dont know why in the world I thouhght a full bridge would give more
voltage, but you are correct. Btw, mine simply oscillates at a higher
frequency without a capacitor on the output.

---Eric
----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Wednesday, July 21, 2004 8:25 AM
Subject: Re: 600V supply (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 21 Jul 2004 08:53:51 +1200
> From: Malcolm Watts <m.j.watts@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: 600V supply (fwd)
>
> On 20 Jul 2004, at 14:21, High Voltage list wrote:
>
> > Original poster: Steven Roys <sroys@xxxxxxxx>
> >
> >
> >
> > ---------- Forwarded message ----------
> > Date: Tue, 20 Jul 2004 10:42:40 -0600
> > From: Hydrogen18 <hydrogen18@xxxxxxxxxxxxx>
> > To: High Voltage list <hvlist@xxxxxxxxxx>
> > Subject: Re: 600V supply (fwd)
> >
> > Tom,
> > full bridge rectify a dispoable camera flash, and put a couple of
> > series electrolytic caps from switching power supplies on the output.
> > Should charge up to around 600 VDC
>
> Unfortunately not. The inverter in the cameras is a forward type with
> output proportional to the turns ratio - i.e. it is largely pegged by
> the battery voltage. Since the camera normally charges a (fairly
> hefty already) capacitor to around 300 VDC a better option might be
> to remove the existing capacitor and replace it with a voltage
> doubler if the circuit configuration allows it. I say this because in
> a lot of these designs, correct inverter operation is dependent on a
> heavy capacitive load on the the output and a common configuration
> actually relies on pushing capacitor charging current through the
> base of the switching transistor.
>
> Malcolm
>
>


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