Bridge output power supply voltage adaptive variable audio power amplifier

Abstract

The invention belongs to the technical field of power amplifiers, in particular to a bridge output power supply voltage adaptive variable audio power amplifier. The amplifier consists of a signal level detection circuit, a bridge output drive circuit and a power supply voltage conversion circuit. The gain compression and development technology is used, when the input signal amplitude is small, signals on two sides of the bridge output are amplified differentially; and when the input signal amplitude is large and the amplitude exceeds a set threshold, output signals on one side of the bridge structure are clamped to fixed level and the output signals on the other side are amplified by double gain. The gain control method can ensure extremely small distortion of signals, can obviously improve the efficiency of the audio power amplifier by combining adaptive power supply voltage technology, and can expand the dynamic range of the output signals. The circuit can be applied to portable equipment powered by batteries, such as mobile phones, MP3 and laptops.

Description

technical field [0001] The invention belongs to the technical field of power amplifiers, and in particular relates to a high-efficiency audio frequency power amplifier circuit with adaptive and variable bridge-type output power supply voltage. technical background [0002] With the development of multimedia technology, audio power amplifiers are more and more widely used in audio and video electronic products. Most consumer-oriented multimedia devices are powered by batteries to improve portability. Power amplifiers have large power losses, so improving the efficiency of power amplifiers is critical to improving the battery life of such portable devices. Although Class D amplifiers operating in switch mode can provide unparalleled high efficiency, the accompanying EMI problem has always been an obstacle limiting its application. Although the design of variable positive and negative power supply voltages has been invented and disclosed, the positive and negative power supply...

AI Technical Summary

Problems solved by technology

Although Class D amplifiers operating in switch mode can provide unparalleled high efficiency, the accompanying EMI problem has always been an obstacle that limits its application

Although the design of variable positive and negative power supply voltages has been invented and disclosed, the positive and negative power supply voltages have high requirements on the process and require triple-well process support

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