Re: Full Bridge SMPS With High No Load Voltage?
- From: meow2222@xxxxxxxxx
- Date: 25 Jan 2006 09:55:27 -0800
cbarn24050@xxxxxxx wrote:
> Jeremy Samuels wrote:
> > In my attempt to build an inverter-style plasma cutter, I have run into
> > a problem. How can a full bridge SMPS create a high (270 VDC) near
> > open circuit voltage, but have a relatively low load voltage (90 vdc at
> > 25+ amps)? The high voltage is used to start the arc, and the lower
> > voltage is used to maintain the arc. I'm planning to use a CCM PFC
> > with an output of 220 vdc into a full bridge (current mode, fs=25khz).
> > See http://www.northerntool.com/downloads/manuals/164686.pdf for
> > similar power supply requirements.
> >
> > Thanks.
>
> You could put an extra winding/diode on the output choke and feed that
> to the output, you would need another diode in the main output to stop
> it feeding back.
Sounds good. The other option is sense the i_out and switch the
regulation voltage accordingly. You might find you've got almost all
the bits in place to do that already.
NT
.
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