Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1978-11-06
1980-08-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330263, H03F 321, H03F 326
Patent
active
042186609
ABSTRACT:
A power transformer connected to an amplifier, said transformer being adapted to operate at maximum power output at a relatively high frequency, in the order of 20 KHz. There is a control circuit which produces control pulses at a frequency of 20 KHz. The voltage level at the output of the transformer is compared to the amplitude of the audio signal to be amplified to produce a control signal related to the difference between the two. This control signal acts through a modulator to pass portions of each control pulse, with the duration of the pulse portions that are passed being generally proportional to the magnitude of the control signal. These pulse portions in turn open and close a switch connected to the primary winding of the transformer to control the duration of current pulses which flow through the transformer at a 20 KHz frequency. When the power requirements of the amplifier are either higher or lower, the duration of the current pulses to the transformer are made longer or shorter, respectively, to match the power requirements of the amplifier.
REFERENCES:
patent: 3319175 (1967-05-01), Dryden
patent: 3396326 (1968-08-01), Kisrow
patent: 3426290 (1969-02-01), Jensen
patent: 3564393 (1971-02-01), Williamson
patent: 3581187 (1971-05-01), Grady
patent: 3585517 (1971-06-01), Herbert
patent: 3740640 (1973-06-01), Ravas
patent: 3745443 (1973-07-01), Weil
patent: 3772606 (1973-11-01), Waehner
patent: 3863140 (1975-01-01), Easter et al.
patent: 3873903 (1975-03-01), Kuetsch et al.
patent: 3931567 (1976-01-01), Kostecki
patent: 3961280 (1976-06-01), Sampei
patent: 4054843 (1977-10-01), Hamada
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