More New Toys!

[Dave Brown]

----- Original Message ----- 
From: "Joe R." <rigdonj at cfl.rr.com>
>  I understand all that but AC power is cheap and so is a fan to 
> dissapate
> the excess heat. It's surprising to see a company spent money for 
> features
> like this unless there is a very real requirement for them. Even HP 
> doesn't
> go to this length with their power supplies.

CVTs (resonant xfmrs) have the big advantage that they significantly 
reduce lots of noise and transients and such nasties that would 
otherwise cause havoc on a logic supply rail. They also provide a 
pre-regulating function to reduce the voltage range the following DC 
regulator has to handle.
I think pre-regulators used to be fairly common in higher power 
regulated DC supplies- always thought it was due to limitations in the 
semiconductors available at the time.  Saturable reactors on the 
primary side were often used - SCR based secondary side stuff came a 
bit later.

 DaveB, NZ




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