RE: [CAD_CAM_EDM_DRO] Re: Not-so-off-topic: rectifiers

Dual secondary, or tapped secondary? There's a difference. If it's truly two
secondaries that run through their own diodes, I'd be more apt to think that
they had the transformers left over from something else (or purchased them
at a surplus house). Given a choice between a center tapped and bridge
circuit, I'd prefer the center tapped design. Basically, it has fewer parts
(even if you use a packaged bridge, it's two diodes vs four. I'd also put a
small inductor between the diode cathodes and the filter capacitor to limit
the inrush current and protect the diodes.

| -----Original Message-----
| From: alenz@... [mailto:alenz@...]
| Sent: Thursday, July 12, 2001 10:09 PM
| To: CAD_CAM_EDM_DRO@yahoogroups.com
| Subject: [CAD_CAM_EDM_DRO] Re: Not-so-off-topic: rectifiers
|
|
| --- In CAD_CAM_EDM_DRO@y..., Randy Gordon-Gilmore <zephyrus@r...>
| wrote:
| >............
| > I did notice that on the too-enthusiastic linear supply I had, they
| used a
| > dual secondary and a single diode on each one, instead of a single
| > secondary and a bridge. I'm assuming that beefy single diodes are
| easier
| > to come by than beefy bridges...
|
| Randy,
| I've wondered the same thing, but it might be the cost of the
| transformer rather than the diodes. The center tapped transformer
| used in the two diode rectifier has to have double the voltage
| but only half the current rating of the one used in the bridge
| rectifier. I know that as the current rating goes up, so does the
| size and weight. Not sure what the economic trade-offs are.
| I had a 24 V 10 amp that I used. It and a small 12 v supply just
| barely squeeze into an old PC power supply case. Works fine, but it
| takes both hands to pick it up! That is the downside of too much
| overkill.
| al
|
|
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