Patent ID: 8330538
Filing Date: 2012-12-11
Classification: H03F

Abstract:
1. A improved self-oscillating audio amplifier, comprising: a signal amplifier unit, being coupled to an audio source to receive and amplify audio signals into amplified audio signals; at least one self-oscillation modulation unit, being coupled to the signal amplifier unit to receive the amplified audio signals and configured to perform pulse modulation on the amplified audio signals in a self-oscillating way to output pulse-modulated signals; at least one gate drive unit, being coupled to the at least one self-oscillation modulation unit to receive the pulse-modulated signals and configured to control the on/off status of the circuit of the next stage according to the pulse-modulated signals; at least one output stage transistor set, being coupled to the gate drive unit, wherein the gate drive unit receives the pulse-modulated signals outputted by the self-oscillation modulation unit and, according to the pulse-modulated signals, controls the on/off status of the output stage transistor set so that the output stage transistor set outputs modulated audio signals; an audio amplifier positive output terminal, being coupled to the output stage transistor set to receive the modulated audio signals and drive a speaker; an audio amplifier negative output terminal, being coupled to the output stage transistor set to receive the modulated audio signals and to drive the speaker; and a distortion restraint unit, being coupled to the audio amplifier positive output terminal, the audio amplifier negative output terminal and the signal amplifier unit, and being configured to detect whether the modulated audio signals outputted by the output stage transistor set to the audio amplifier positive output terminal and the audio amplifier negative output terminal is distorted and, if distorted, restrain the distortion, the distortion restraint unit comprising: