Re: NiMH again

On Wed, 07 Sep 2005 18:10:46 +0100, Kit wrote:

> A switching power regulator generally still requires some magnetic
> component, either an inductor or transformer, but because they run at many
> hundreds of kilohertz these days, that inductor or transformer will be low
> value and small size.

Maybe generally, but the first circuits I saw had no transformers.
Mostly RC components, but there may have been some inductors. But
they wouldn't have acted as transformers, more as part of a resonant
LC circuit. You're correct that the high frequencies involved go a
long way to reduce the package size. I really like the small, cool
running wall warts that have replaced the very large, heavy, hot
running models that use transformers.

.

Relevant Pages

  • Effects of gaps in inductors and transformers
    ... but not in most transformers. ... explained that the gap size can maximize energy storage in an inductor by ... As an inductor is used more for energy storage, ...
    (sci.electronics.design)
  • Re: forward converter, higher Bmax through gap?
    ... > The original question didn't mention transformers (or telephone bills, ... > pot core or toroid, ... as an energy storage device (DC filter inductor, ... The gap also makes the inductance much ...
    (sci.electronics.design)
  • Re: DC Motor Control - Heat Issue
    ... >>oven transformer could be used as an inductor, ... > Billions of audio transformers use laminated silicon iron cores. ... > stuff used for microwave transformers isn't likely to be very good at 8 ... Why is he trying to drive a 10 amp motor with the equivalent of RF? ...
    (sci.electronics.design)
  • Re: transistor for small boost converter
    ... >>>switch the FET. ... with FET on, base current flows thru Rb, D ... > Making an inductor is just much simpler. ... Regarding winding transformers being difficult: ...
    (sci.electronics.design)