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Step-up power supply method and circuit, audio device

A technology of step-up power supply and circuit, applied in the direction of transducer circuit, loudspeaker, electrical components, etc., can solve the problem of large power loss of audio power amplifier, and achieve the effect of reducing power loss

Active Publication Date: 2022-04-15
上海艾为集成电路技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventor found that when the audio input signal is small, if the power output stage circuit is also powered by the above-mentioned boost circuit, the power loss of the audio power amplifier will be very large

Method used

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  • Step-up power supply method and circuit, audio device
  • Step-up power supply method and circuit, audio device
  • Step-up power supply method and circuit, audio device

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Embodiment Construction

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention. In the case of no conflict, the following embodiments and technical features thereof can be combined with each other.

[0057] As mentioned in the background art, currently, a boost circuit such as a boost boost circuit or a charge pump boost circuit is usually used to supply power to the power output stage circuit of an audio power amplifier. The inventors have found through research that, when the audio input signal is small, if the power output stage circuit is powered by the above-mentioned boost circuit, the power los...

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Abstract

The invention discloses a boosting power supply method, a boosting power supply circuit and an audio device, which can provide different boosting voltages according to the size of the audio input signal and reduce the power loss of the audio frequency power amplifier. The step-up power supply method includes: generating a power detection flag signal according to the power of the audio input signal; judging whether boosting is required according to the power detection flag signal; if boosting is required, generating a boost control signal, and detecting The magnitude of the flag signal sets the boost threshold setting signal; the boost mode is turned on according to the boost control signal, the output boost is used to supply power to the power output stage circuit, and the boost value is controlled according to the boost threshold setting signal.

Description

technical field [0001] The invention relates to the technical field of audio power amplifiers, in particular to a boosting power supply method, a boosting power supply circuit and an audio device. Background technique [0002] As portable devices such as smart phones have higher and higher requirements on static power consumption and dynamic power consumption, lower static power consumption and dynamic power consumption are also required for audio power amplifiers. An audio power amplifier includes a power output stage circuit, which is currently powered by a boost circuit such as a boost boost circuit (also called a boost chopper circuit) or a charge pump boost circuit. [0003] The inventors have found through research that, when the audio input signal is small, if the power output stage circuit is powered by the above-mentioned boost circuit, the power loss of the audio power amplifier will be very large. Contents of the invention [0004] Based on this, the present in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R2203/00
Inventor 薛蓉
Owner 上海艾为集成电路技术有限公司