Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1996-07-18
1998-07-07
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
H03F 304
Patent
active
057775192
ABSTRACT:
A high efficiency power amplifier system receives an unregulated voltage signal and an input signal V.sub.in, and conditions the unregulated voltage signal to provide a regulated output signal whose magnitude depends on the value of the input signal V.sub.in. The system includes a control circuit which detects changes in the input signal V.sub.in and the regulated output signal, and provides a feedback signal to a variable output switching regulator, which controls the regulated output signal value to maintain a predetermined relationship between the input signal V.sub.in and the regulated output signal. Significantly, controlling the regulated output signal such that it maintains the predetermined relationship with the input signal V.sub.in allows the power amplifier system to provide the regulated voltage signal directly to the electrical load. The control circuit monitors V.sub.in and the regulated output, and as either signal changes the control circuit provides the feedback control signal to the variable output switching regulator in order to drive V.sub.out such that the predetermined relationship (e.g., V.sub.out =constant*V.sub.in) is maintained. Providing V.sub.out in this manner substantially reduces the power dissipation of the power amplifier system.
REFERENCES:
patent: 4507619 (1985-03-01), Dijkstra et al.
patent: 5396174 (1995-03-01), Williamson et al.
Harris Semiconductor, "Class-D Audio II Evaluation Board (HIP4080AEVAL2)", by George E. Danz, Oct., 1995, No. AN9525.1, pp. 1-16.
Harris Semiconductor, "A DC-AC Isolated Battery Inverter Using the HIP4082", by George E. Danz, No. AN95xx, pp. 1-16.
Harris Semiconductor, "High Frequency Power Converters", by Rudy Severns, Apr., 1994, No. AN9208.
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