Class-D amplifier

Details Class-D amplifier Class-D amplifier

2007-09-04

2007-09-04

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Miscellaneous

Amplifier protection means

C330S010000, C330S251000

Reexamination Certificate

active

11179903

ABSTRACT:
A class-D amplifier has a switching amplifying-unit, which includes a pair of switching elements. The unit drives the switching elements and generates pulse amplified switching signals. The amplifier also has a signal-generating unit, which generates pulse width modulation signals each for driving the switching elements and supplies the generated pulse-width modulation signals to the. switching amplifying-unit. The switching amplifying-unit includes a detecting sub-unit, which detects an operating state of the switching elements. The signal-generating unit includes a dead-time-setting sub-unit, which sets dead time relative to the switching elements by delaying each of the pulse width modulation signals using propagation delay times in logic devices. The signal-generating unit also includes a control sub-unit, which controls the dead-time-setting sub-unit based on a detected result of the detecting sub-unit to change the dead time based on the operating state of the switching elements.

REFERENCES:
patent: 6118336 (2000-09-01), Pullen et al.
patent: 6294954 (2001-09-01), Melanson
patent: 7034609 (2006-04-01), Risbo et al.

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