Re: Full-Bridge -vs- Half-Bridge

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

Hi David,

On 24 Jun 2004, at 18:48, Tesla list wrote:

 > Original poster: humanb-at-chaoticuniverse-dot-com
 >
 > I posted this last week but didn't get any answers, so
 > I'll try one last time ;-)
 >
 > On Fri, 18 Jun 2004 12:52:22 -0700 (PDT),
 > humanb-at-chaoticuniverse-dot-com wrote:
 >
 >  >
 >  > Hi, can someone tell me just how much more power a
 >  > H-bridge can process over a Half-Bridge? It's not just
 >  > 2X as much is it? It isn't that simple, is it? Also,
 >  > what would be the best way to calculate the optimum
 >  > Capacitance in the voltage divider for a Half-Bridge?
 >  > Currently I am using two 1uF caps, but when running a
 >  > resonant tank one may want to adjust this, so I would
 >  > like to find a way to calculate the optimum ballance.
 >  >
 >  > Thanks,
 >  >
 >  > David Trimmell

As far as power processing goes,you have 2x the voltage swing,
therefore for a given load resistance, 4x the power over a half-
bridge. The rectifiers should have twice the current rating although
this depends somewhat on the amount of filter capacitance you are
running and the filter capacitance depends on the amount of ripple
you can tolerate under full load conditions.

Malcolm