PWM (pulse width modulation) audio power amplifier

A pulse width modulation, audio power technology, applied in power amplifier, pulse duration/width modulation, differential amplifier and other directions, can solve the problem of low efficiency of the whole machine, achieve EMI improvement, improve efficiency and power utilization efficiency, reduce The effect of noise interference

Inactive Publication Date: 2015-06-10
ANHUI UNIV OF FINANCE & ECONOMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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If the coupling between the power amplifier and the power circuit i

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  • PWM (pulse width modulation) audio power amplifier
  • PWM (pulse width modulation) audio power amplifier
  • PWM (pulse width modulation) audio power amplifier

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[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to make a clearer and clearer definition of the protection scope of the present invention.

[0030] See figure 1 , The embodiment of the present invention includes:

[0031] A pulse width modulation audio power amplifier, including linear isolation modules, PWM (Pulse Width Modulation, pulse width modulation) amplifying and modulating thick film, suspension driving module, high voltage power bridge, Butterworth filter, and audio signal input terminals connected in sequence Connect the input of the linear isolation module, and the output of the Butterworth filter to the load of the audio power amplifier. The power supply of the audio power amplifier passes through the bridge rectifier circuit, LPF (Low Pass Filter, low pass f...

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Abstract

The invention discloses a PWM (pulse width modulation) audio power amplifier comprising a linear isolating module, a PWM amplifying modulating thick-film, a suspending drive module, a high-tension power bridge and a Butterworth filter. The audio signal input end is connected with the input end of the linear isolating module. The output end of the Butterworth filter is connected with a load of the amplifier. supplied power of the amplifier passes a bridge rectifier circuit, an LPF (low pass filter) and a dual-closed ring APFC (active power factor correction) circuit and is then transmitted to the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter; the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter form a class-D bridge power amplifier topological structure. The amplifier integrating signal amplifying, driving, amplified power output and power supply has the advantages that efficiency of the amplifier is greatly improved, service efficiency of the power supply is greatly improved, and electromagnetic interference of equipment is greatly improved.

Description

technical field [0001] The invention relates to the field of high-power digital power amplifiers, in particular to a pulse width modulation audio power amplifier. Background technique [0002] Power audio signal amplifier is one of the most important analog electronic devices, it can amplify low power audio signal to high power signal. Audio power amplifiers are divided into two major lineups from the principle of amplification: traditional analog circuit power amplifiers and digital circuit power amplifiers that have appeared in recent years. Analog circuit power amplifiers include Class A, Class B, and AB audio signal amplifiers, which have dominated the audio field for decades with their sweet sound quality and mature technology. [0003] But the most fatal shortcoming of this type of power amplifier is the low power conversion efficiency. Because the energy of the signal output is provided by the power supply, there is a conversion efficiency problem between the two. ...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/32H03F3/20H03F3/45H03K7/08
Inventor 吴国新余华奇徐守东刘从九徐文璞
Owner ANHUI UNIV OF FINANCE & ECONOMICS
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