Re: Electronical question

Yes, I have large switchers in the shop and used KW grade ones in designs.

But the typical wall wart isn't a switcher. I know the wart for our fax
machine is a switcher, but most others are iron core transformers.

Ferrite-core transformers are more expensive to do, but within the profit
line of some products. In dog-eat-dog of PC's I'd be cautious.

Heft the wart - does it feel light or lighter than others ?

Martin


Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Don Foreman wrote:
On Sat, 27 Sep 2008 21:37:16 -0500, "Martin H. Eastburn"
<lionslair@xxxxxxxxxxxxxxxx> wrote:

Or the output voltage is 1x or 2x and regulated to 1x with the dc regulator.

Square wave waveforms saturate transformers and tend to overheat and burn
them out.

Only if the transformer isn't designed to handle squarewaves. In a
switcher, whatever voltage is supplied is rectified before use
anyway so the supply waveform is about immaterial. The DC is then
converted to high-freq AC, of waveform suitable for the small HF
transformers designed to work in that particular circuit. Some are
squarewave, others (as in resonant converters) aren't.

I'm not current on power supply design and technology anymore, but I
designed a bunch of switchmode squarewave ferrite-core transformers
some years ago. Ain't no big deal, they don't saturate if they're
designed for the job.





----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= - Total Privacy via Encryption =---
.

Relevant Pages

  • Re: THE BILL MAY REPORT: Buying the best output transformer
    ... how "those amateurs designed the glass twice the necessary size". ... He also designs a meaty transformer. ... listening tests, on 13 different transformers, more transformers than ... If, because you're British, you mean Sowter, back when the tests were ...
    (rec.audio.tubes)
  • Re: overloading wirewound resistors
    ... The original design used a switcher, but it had a tendency to blow up. ... When there's this much power involved, ... The early ones were tube designs, and used a pair of custom output ... The transmitter ran directly off either three phase 208, ...
    (sci.electronics.design)
  • Re: Speaking of high frequency transformer stuff...
    ... Winfield Hill wrote: ... No transformers, no optical couplers, nada. ... IR2113 half-bridge driver chip. ... My own designs use the parts (purchased ...
    (sci.electronics.design)
  • Re: SE Headphones Amp
    ... looked at specs from various suppliers of such transformers. ... If one designs for Fsat at below 20Hz then the size of a 5 watt rated ... crap from an old radio. ...
    (rec.audio.tubes)
  • Re: Hysteretic buck converters
    ... So did I and still do, although I prefer logic chips. ... all my switcher designs I'd bet that>50% did not contain any PWM chip. ...
    (sci.electronics.design)