Implementation method of high-power low-distortion D-type power amplifier based on high-performance MCU

Abstract

The invention discloses an implementation method of a high-power low-distortion D-type power amplifier based on a high-performance MCU, and belongs to the field of audio power amplifiers. The method comprises the following steps: 1) selecting and displaying an input signal mode; 2) preprocessing an input signal to obtain audio data; 3) transmitting the audio data to an STM32F407 minimum system, and outputting PWM to a half-bridge driving module; 4) enabling every two half-bridge driving modules to drive one full-bridge power amplification part to realize power amplification of small signals; 5) filtering the output of the full-bridge power amplification part; 6) carrying out current sampling on the output passing through the low-pass filter, and feeding back to the minimum system; 7) setting a digital filter according to the output feedback signal, and filtering the audio data in the step 1); and 8) repeating the steps 2)-7) to realize negative feedback control of the output. The problem of noise interference at the power-on moment of the D-type power amplifier is solved with low cost, high frequency can be compensated through IIR, and the problem that the D-type power amplifier has high requirements for a filter when the switching frequency is low is solved.

Description

technical field [0001] The invention belongs to the field of audio power amplifiers, and relates to the design and manufacture of a high-performance and convenient human-computer interaction class-D audio power amplifier controlled by STM32F407, in particular to a method for realizing a high-power and low-distortion class-D power amplifier based on a high-performance MCU. Background technique [0002] Class A and B power amplifiers use the linear amplification area of ​​the power tube to directly amplify the audio linearly. The voltage is added to the power tube, and the power tube consumes a lot of power. The class D power amplifier compares the input signal with the triangular wave and then drives the half bridge. After filtering, the power is amplified and the audio is obtained. Because its power tube works in the switching state, it has higher efficiency and lower loss than linear power amplifiers such as Class A and Class A and B, and does not need a large radiator for ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a method for realizing high-power and low-distortion class D power amplifier based on high-performance MCU. The problem of serious distortion and poor human-computer interaction solves the problem of noise interference at the moment of power-on of class D power amplifiers, and can also compensate high frequencies through IIR to solve the problem of high requirements for filters when switching frequency is low for class D power amplifiers

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