Amplifiers – With semiconductor amplifying device – Including class d amplifier
Patent
1992-02-18
1992-11-03
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including class d amplifier
307314, 330207A, H03F 338
Patent
active
051608960
ABSTRACT:
A hysteresis-type pulse width modulator for a class D audio amplifier converts an input voltage into a pulse width modulated waveform. The width of the pulses is related to the input voltage amplitude. The modulator comprises a window comparator, a supply voltage source having a pair of terminals across which a supply voltage is provided, and a hysteresis voltage source having a pair of terminals across which a hysteresis voltage is provided. The hysteresis voltage source comprises a multiplier, a comparator for adding the supply voltage and input voltage to generate a sum voltage, and a comparator for subtracting the input voltage from the supply voltage to generate a difference voltage. The audio amplifier output stage comprises first and second solid state devices, each having a controlled current conducting path comprising first and second terminals and a controlling current conducting path comprising at least a third terminal. The output stage also includes an uncontrolled current conducting path in antiparallel relation with each of the devices' controlled current conducting paths. A saturable reactor is positioned in series with the uncontrolled current conducting path to limit current flow therethrough during the switching of current flow from the controlled current conducting path of one of the devices to the uncontrolled current conducting path occasioned by operation of the amplifier.
REFERENCES:
patent: 2915588 (1959-12-01), Bose
patent: 3038964 (1962-06-01), Bose
patent: 3294981 (1966-12-01), Bose
patent: 4456872 (1984-06-01), Foreschle
patent: 4531096 (1985-07-01), Yokayama
patent: 4602166 (1986-07-01), Smith
patent: 4649565 (1987-03-01), Kaizer et al.
Harman International Industries Incorporated
Mottola Steven
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