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Audio amplifier circuit using closed-loop power output stage and its control method

An audio amplifier, power output stage technology, applied in low frequency amplifier, amplifier control, amplifier and other directions, can solve the problem of inability to guarantee output voltage stability, and achieve the effect of good power supply voltage suppression performance

Inactive Publication Date: 2011-12-14
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this bridge-tied-load (BTL) audio amplifier using an open-loop audio power stage cannot guarantee that its output voltage will remain stable when the power supply voltage jumps.

Method used

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  • Audio amplifier circuit using closed-loop power output stage and its control method
  • Audio amplifier circuit using closed-loop power output stage and its control method
  • Audio amplifier circuit using closed-loop power output stage and its control method

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Embodiment Construction

[0040] The audio amplifier circuit and its control method according to the embodiments of the present invention will be described in detail below. In the following description, some specific details, such as specific circuit structures in the embodiments and specific parameters of these circuit elements, are used to provide a better understanding of the embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without many of the details or other combinations of methods, elements, materials, etc.

[0041] The invention provides a closed-loop audio power stage structure that can be applied to the power output stage of the audio amplifier, and provides an audio amplifier circuit including the closed-loop power output stage and a control method thereof.

[0042] In the following detailed description, the working principle of the closed-loop power output stage proposed by the present invention and the audio ...

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PUM

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Abstract

The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an amplifier circuit. The closed-loop power stage is configured to receive a PWM input signal having a first frequency and a first duty cycle, a power supply voltage, and a bias signal related to the power supply voltage, and to output a square-wave signal having a second frequency and a second duty cycle. The closed-loop power stage comprises a feedback loop which is configured to regulate the second duty cycle of the square-wave signal in response to a variation in the power supply voltage. The audio amplifier circuit comprising the closed-loop power stage may have a stable output voltage and thus have good power supply rejection performance.

Description

technical field [0001] This invention relates to power amplifiers, and more particularly to output stages of audio amplifiers. Background technique [0002] Audio amplifiers, especially digital audio amplifiers, are widely used in digital electronic products such as TVs, car stereos, and DVD players. Typically a pulse width modulated (PWM) input audio power stage is used as the output stage of a digital audio amplifier. Traditional PWM input audio power stages are all open-loop structures, such as figure 1 Shown is a single-ended audio amplifier 100 based on a half-bridge open-loop audio power stage. The audio amplifier 100 includes: a power output stage 101 for receiving a PWM input signal and generating a square wave signal; a filter stage 102 for receiving the square wave signal and generating an output signal to drive a load 103 (such as a speaker). in such as figure 1 In the example shown, the power output stage 101 is a half-bridge structure, which includes switchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03G3/20
CPCH03F1/342H03F3/183H03F3/217H03F3/2173H03F1/30H03F2200/153H03F2200/459H03F2200/351H03F1/301
Inventor 郎芸萍赵慧杰丁华飞
Owner CHENGDU MONOLITHIC POWER SYST