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BTL reverse current flow

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Bill Stein

Jan 1, 1970
0
Can someone please tell me if the direction of current flow reverses
every half cycle at the output of a bridge tied load or push/pull
power amp?

I was told it does, as opposed to single ended which does not.

Bill Stein
 
P

Phil Allison

Jan 1, 1970
0
"Bill Stein"
Can someone please tell me if the direction of current flow reverses
every half cycle at the output of a bridge tied load or push/pull
power amp?

** Yep.

If it did not the load would be receiving a large DC component.

I was told it does, as opposed to single ended which does not.


** I presume you mean single ended, capacitor coupled output ?

In that case, the cap charges to the half rail voltage and acts pretty much
like a battery in series with the load. It cancels the DC component while
passing the AC one in both directions - alternately slightly charging and
discharging each time the current polarity changes.

The case of the BTL stage is interesting in that there is always an
imaginary point inside the load impedance that remains at zero volts
compared to ground. If you imagine this zero point to be ground also, then
the operation of the BTL stage is obvious.




...... Phil
 
P

Phil Allison

Jan 1, 1970
0
"Bill Stein"
Can someone please tell me if the direction of current flow reverses
every half cycle at the output of a bridge tied load or push/pull
power amp?


** OK - spell out what you mean by " the direction "??

In particular - do you maybe mean from the amp into the load as opposed to
from the load back to the amp?


....... Phil
 
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