[Gllug] OT: Merging UPS outputs

Sat Sep 3 17:37:41 UTC 2005

On Sat 03 Sep, Chris Hunter wrote:
> 

> 
> Many of the modern ones use PWM, which can be amazingly efficient.  One 
> design for a PWM controller that I worked on actually had to have the 
> waveshape of the output signal "spoilt" to reduce the risetime so as to 
> reduce the RF noise!
> 
> As an aside, my current PWM modulators (for AM broadcasting) achieve in 
> excess of 95% efficiency, and with Class E PAs, the overall transmitter 
> efficiency is around 90%.  Heat is much less of a problem in modern 
> electronics!
> 
> Chris
> 

> 
> 
   I assume that ferrite inductors can be used for filtering, and with care
could be used to protect the thyristor and allow time for the fuse to blow.

-- 
Chris Bell

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