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Pulse width modulation module, audio power amplifier circuit and electronic equipment

An audio power amplifier circuit, pulse width modulation technology, applied in the direction of pulse duration/width modulation, low frequency amplifier, etc., can solve the problems of high power consumption and large output noise, and achieve the effect of reducing power consumption and noise

Active Publication Date: 2021-09-17
SHANGHAI AWINIC TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0004] In view of this, this application provides a pulse width modulation module, audio power amplifier circuit and electronic equipment, to solve the existing circuit when the input signal of the audio power amplifier is very small or When it is 0, the duty ratio of the pulse width modulation signal output by DPWM is kept at 50%, and the power amplifier circuit keeps working at this time, the output noise is larger, and the power consumption is also higher.

Method used

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  • Pulse width modulation module, audio power amplifier circuit and electronic equipment
  • Pulse width modulation module, audio power amplifier circuit and electronic equipment
  • Pulse width modulation module, audio power amplifier circuit and electronic equipment

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Embodiment Construction

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application. In the case of no conflict, the following embodiments and technical features thereof can be combined with each other.

[0029] It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or devi...

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Abstract

The invention discloses a pulse width modulation module, an audio power amplifier circuit and electronic equipment, the pulse width modulation module is applied to the audio power amplifier circuit, and the pulse width modulation module is used for receiving a control signal through a control end and selecting a corresponding data source according to the control signal to carry out pulse width modulation so as to output a pulse width modulation signal; and the data source comprises a first data source and a second data source, the first data source is a first data signal generated according to the control signal, and the second data source is a second data signal generated after a digital audio signal input by the audio power amplifier passes through a digital-to-analog converter. According to the pulse width modulation module, the data source selected by the pulse width modulation module is controlled to perform pulse width modulation according to the control signal, the first data source is generated according to the control signal, and the duty ratio of the pulse width modulation signal corresponding to the first data source is 0 or low level, so that the driven power amplifier stops working, the power consumption of the power amplifier is reduced, and noise is reduced.

Description

technical field [0001] The present application relates to the technical field of signal modulation, in particular to a pulse width modulation module, an audio power amplifier circuit and electronic equipment. Background technique [0002] In the audio power amplifier circuit, a digital pulse width modulator (DPWM) is often connected to the output of the digital-to-analog converter. The function of the DPWM is to convert the signal output by the digital-to-analog converter into a pulse-width modulated signal to drive the power amplifier. And then realize the driving of external audio equipment. [0003] In the prior art, when the digital audio signal input by the audio power amplifier circuit is very small or 0, the duty ratio of the pulse width modulation signal output by the DPWM is kept at 50%, and the power amplifier will always be in the working mode at this time, and the power amplifier The high power loss caused by switching switching, the output noise will remain at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08H03F3/181
CPCH03K7/08H03F3/181
Inventor 刘东姚炜
Owner SHANGHAI AWINIC TECH CO LTD
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