Amplifiers – Modulator-demodulator-type amplifier
Patent
1991-01-03
1992-11-10
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330207A, H03F 338
Patent
active
051631741
ABSTRACT:
A power amplifier for amplifying analog input signals includes one or a plurality of amplifier modules which are connected in series on their output sides, which preferably each include a double mains unit having three outputs and a mains transformer connected in a wye pattern on its secondary side, with the two outer outputs each being connected by way of a main switch with the filter choke of a lowpass filter and by way of a free running diode connected between the main switch and the filter choke with the middle output while the middle output, in turn, is connected directly with the secondary side wye point of the transformer and, on the other hand, directly with the junction of the two series connected filter capacitors of the two lowpass filters. Due to this direct connection of the wye points with the lowpass filters, the normally damaging build-up capacitances of the transformer become integral components of the lowpass filters so that the high switching frequencies are no longer present at the transformer but only the lower frequency input signal which results in a considerable reduction of the power loss in connection with the build-up capacitances of the transformer. in order to reduce so-called negative crest mode distortions, each free running diode is connected in parallel with an auxiliary switch which is operated in push-pull to the associated main switch.
REFERENCES:
patent: 4164714 (1979-08-01), Swanson
patent: 4369409 (1983-01-01), Kyrian et al.
European Search Report "PTL-UL/P3907919" Dec. 4, 1990, four pages.
P. 471 from Article entitled "Transformer" relating to three-phase transformers and in particular Wye or delta (undated).
Mullins James B.
Telefunken Sendertechnik GmbH
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