Amplifiers – Modulator-demodulator-type amplifier
Patent
1984-08-27
1985-11-19
LaRoche, Eugene R.
Amplifiers
Modulator-demodulator-type amplifier
330251, H03F 338
Patent
active
045545120
ABSTRACT:
A switching amplifier comprises an input terminal connected to a d.c. power supply and an output terminal connected to a load. At least one power transistor is placed in series with the input and output terminals. A PWM circuit outputs a pulse width modulated signal. An isolating driver circuit between the PWM circuit and the control terminal of the power transistor comprises a low voltage power supply; a transformer having primary and secondary windings; an oscillator for outputting a high frequency signal; means for gating the high frequency signal from the oscillator to the primary winding of the transformer in response to the pulse width modulated signal from the PWM circuit; a MOSFET; means for rectifying the voltage in the secondary winding of the transformer and for applying the rectified voltage to the gate of the MOSFET; and switching means for rapidly discharging the gate of the MOSFET when the high frequency signal is no longer gated to the transformer.
REFERENCES:
patent: 2951212 (1960-08-01), Schmid
patent: 3054066 (1962-09-01), Crane
patent: 3260912 (1966-07-01), Gregory
patent: 3294981 (1966-12-01), Bose
patent: 3835408 (1974-09-01), Shaffer
patent: 3859604 (1975-01-01), Rankin
patent: 3946324 (1976-03-01), Smith
patent: 4075572 (1978-02-01), Cavigelli
"Switching Inductive Currents with Power Transistors", by Ray A. Colclaser, Electro Technology, Oct. 1962, pp. 125-127.
Aerotech, Inc.
LaRoche Eugene R.
Mottola Steven J.
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