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Re: Full-Bridge -vs- Half-Bridge
Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
Terry is completely correct, but generally our switching devices can only
take so much current. So say if you are running right at the SOA ratings
of a device in a half-bridge, then moved up to a full bridge, you would
have to adjust your "load" so that you do not exeed the current rating of
What it boils down to, David, is that a full-bridge will switch about 2X
the power (because its 2X the voltage swing and you want current to stay
the same (usually)).
An example would be for Jimmy Hynes DRSSTC, he recently ran it half-bridge
and got 60" sparks, full bridge got him 93" or so i think... this does not
follow what i said above (since he didnt modify his load, though he DID run
it with more cycles ;-) so its *like* a lower Z load sorta... it uses more
current), but it should give you at least a rough idea of what it boils
down to in real life.
>From: "Tesla list" <tesla-at-pupman-dot-com>
>Subject: Re: Full-Bridge -vs- Half-Bridge
>Date: Fri, 25 Jun 2004 08:00:20 -0600
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>In general, a full bridge will deliver twice the voltage swing. This also
>produces twice the current to the load. Thus the power goes up four times.
>At 10:33 AM 6/24/2004, you wrote:
>>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),
>> > 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