Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1982-02-12
1984-04-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
363125, H03F 304, H02M 700
Patent
active
044450958
ABSTRACT:
An audio amplifier connected to the secondary winding of a transformer. The primary winding of the transformer is connected in a series with a triac to a conventional power source, such as a 60 hertz, 115 to 120 volt source of alternating current. The triac is turned on at a predetermined time during the latter portion of each half cycle to cause a current pulse to be transmitted through the primary winding. To make the triac non-conductive to terminate each pulse, there is provided a bypass circuit (comprising a second triac and a capacitor in series) connected in parallel with the first triac. A tank circuit is connected in parallel with the transformer primary to cause an oscillation in the primary winding, so that the second triac can be turned on at a time of low current to shunt the first triac, thus causing it to turn off and terminate the current pulse.
REFERENCES:
patent: 3466527 (1969-09-01), Chun
Miura et al. "New Power Supply for Audio Power Amplifiers" IEEE Transaction on Consumer Electronics, vol. CE-24, No. 3, 1978.
Mullins James B.
Wan Gene
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