Switching amplifier system

Details Switching amplifier system Switching amplifier system

1975-12-29

1977-04-05

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

040165019

ABSTRACT:
A switching amplifier includes a pulse width modulator for converting a bipolar input signal, which may be a speech signal, into a train of unipolar pulses having durations which vary with the instantaneous absolute amplitude of the input signal. The pulses control the energizing of a series switch which supplies current to a switching bridge circuit. The switching arms of the bridge circuit are controlled by the polarity of the input signal. Another switch and several diodes are used to provide a path for output current when the series switch is open. The output current is filtered to remove fluctuations at the switching rate, and applied to a load. The amplified output voltage signal accurately follows the input signal, and the efficiency of conversion of DC power to AC output power can approach 100 percent, limited only by switching and filtering losses. A single polarity DC supply, such as a battery, is used to provide bipolar output current to an ungrounded load. High efficiency is maintained even with partially reactive loads, since the switching circuits return reactive power to the DC power supply.

REFERENCES:
patent: 3253228 (1966-05-01), Montner
patent: 3585517 (1971-06-01), Herbert
patent: 3629616 (1971-12-01), Walker
patent: 3829788 (1974-08-01), Ford

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