Bridge output power supply voltage adaptive variable audio power amplifier

A technology of power supply voltage and audio power, applied in the direction of power amplifiers, etc., can solve the problem of high technical requirements for positive and negative power supply voltages, and achieve the effects of improving dynamic range, improving efficiency, and improving efficiency

Inactive Publication Date: 2010-12-29
FUDAN UNIV
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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

Method used

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  • Bridge output power supply voltage adaptive variable audio power amplifier
  • Bridge output power supply voltage adaptive variable audio power amplifier
  • Bridge output power supply voltage adaptive variable audio power amplifier

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Embodiment Construction

[0015] The present invention will be described in detail below according to the accompanying drawings and design examples.

[0016] The invention designs a signal gain conversion circuit for a high-efficiency audio power amplifier with a single-phase bridge-type output power supply voltage adaptively variable. A typical application structure of this circuit is as figure 1 shown. The audio amplifier is mainly composed of the following parts: (1) Signal level detection circuit, this part of the circuit detects the amplitude of the input signal VIND, when the amplitude of the input signal VIND is small, the signal level detection circuit generates a fixed reference voltage VREF to the voltage conversion circuit. The fixed reference voltage is 1.4V in this example. At the same time, the signal detection circuit transmits the input differential signal, the common mode signal vcm, and the output common mode voltage vocm of the bridge output stage to the output amplifier of the br...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20
Inventor 彭振飞虞佳乐冯勇杨姗姗洪志良
Owner FUDAN UNIV
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