Amplifiers – Output networks – Transformer coupled
Patent
1993-07-16
1995-06-06
Mullins, James B.
Amplifiers
Output networks
Transformer coupled
H03F 300
Patent
active
054225990
ABSTRACT:
A single ended audio amplifier having at least two primary windings, not necessarily matched, in the primary of an output matching transformer: one for the amplifier final stage; and another winding to produce in the same core a magnetizing force equal and opposite for out-of-band currents. Primary among these is quiescent current, but subsonic anode current variations due to signal or drift of operational conditions may be cancelled as well. A sensor tracks the quiescent and subsonic currents of the output amplifier device. The sensor output is low-pass filtered to control a three terminal current regulator that drives the second coil to oppose the out-of-band anode currents in the first (signal) coil of output transformer primary. Thus, the current in the first primary winding is controlled by the transconductance of the amplifier device; and the current in the second primary winding is controlled by a voltage controlled current regulator, the control voltage tracking the current in the first winding over various operational conditions to accomplish magnetic cancellation for quiescent and subsonic components of anode current in the first coil of the output transformer.
REFERENCES:
patent: 2895019 (1994-02-01), Farger
LandOfFree
Single-ended, transformer coupled audio amplifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single-ended, transformer coupled audio amplifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single-ended, transformer coupled audio amplifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-990251