Amplifiers – Modulator-demodulator-type amplifier
Patent
1996-04-26
1998-07-14
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
H03F 338
Patent
active
057810672
ABSTRACT:
An electronic inductive switching power amplifier designed for but not limited to amplification of electrical audio signals consists of a power conversion system, a signal control system together with a direct current power source wherein the power conversion system comprising of a pulse width modulator circuit, primary semiconductor switches and a high frequency switching transformer wherein the direct current power source is pulse width modulated through primary winding on the switching transformer by the primary semiconductor switches being controlled by the pulse width modulator. The switching transformer further comprises of a secondary winding wherein the primary to secondary winding ratio effects the required power conversion and amplification. The signal control system comprising of a multifunction preamplifier, an output driver circuit, a full wave rectifier, output semiconductor switches and a low pass electronic filter wherein the electrical audio input signal to be amplified is applied to the multifunction preamplifier thereafter producing two output signals one being an absolute value signal controlling the pulse width modulator and the second signal which is a square wave switching signal at the same frequency and phase as the input signal controlling the output driver circuit thereby producing complimentary switching signals further controlling the output semiconductor switches. The pulse width modulated output signal from the secondary winding on the switching transformer passes through the full wave rectifier and thereafter being alternately switched through the low pass filter whereby the original input waveform is reconstructed but at a greatly increased power level.
REFERENCES:
patent: 3829788 (1974-08-01), Ford
patent: 4016501 (1977-04-01), Jasinski et al.
patent: 5510753 (1996-04-01), French
Hill Nancy E.
Mullins James B.
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