High-power power amplifier circuit and its working method based on class-d amplification to drive class-b output

Abstract

The invention discloses a high-power amplifier circuit based on D type amplification push and B type output and a working method thereof. A power amplifier circuit comprises a power amplifier circuit and a D type amplification push circuit; the D type amplification push circuit comprises a positive electrode D type amplification push circuit and a negative electrode D type amplification push circuit; the power amplifier circuit is connected with the positive electrode D type amplification push circuit and the negative electrode D type amplification push circuit; the positive electrode D type amplification push circuit comprises a signal acquiring circuit, a comparison circuit and a control circuit. The working method comprises the following steps: comparing signals by acquiring the signals, and outputting a control signal to control the output voltage of a power-supply regulating circuit. The technical scheme disclosed by the invention can enable the voltage at the output end of the power-supply regulating circuit to match with the power amplifier output voltage, the harmonic distortion and intermodulation distortion are lowered, the sound restoration capacity is improved so that the low pitch is more powerful and the high pitch is distortionless; the sound is bright, clear and powerful, and meanwhile, the energy consumption is small, and the calorific value is low.

Description

technical field

[0001] The invention relates to a power amplifier, especially a power amplifier circuit. Background technique

[0002] The power amplifier is the most basic device in the audio system. Its task is to amplify the weak signal from the signal source through the audio power amplifier to drive the speaker to emit sound. In the audio field, the common types of power amplifiers are Class A, Class B, Class AB, Class D, and Class H. Traditional analog audio power amplifiers include Class A, Class B, and Class AB. Their sound quality is high and they have always occupied a dominant position. Its development has gone through the process from electron tube, transistor to integrated circuit, circuit composition from single tube to push-pull process, circuit form from transformer output to OTL, OCL, BTL form process, the biggest disadvantage is that the work efficiency is too low, class A audio power amplifier The highest working efficiency of the class B audio power ampl...

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