Loudspeaker protection circuit capable of preventing direct current overload for audio power amplifier

Abstract

The invention discloses a loudspeaker protection circuit capable of preventing direct current overload for an audio power amplifier. The loudspeaker protection circuit comprises a reference generation module I, a signal detection module H, an oscillator module E, a delay counting module F and a protection triggering judgment module G, wherein the reference generation module I provides a reference level for the signal detection module H; the signal detection module is used for detecting whether direct-current signal input and alternating-current signal input are valid; when the detection module H detects a direct-current signal, the oscillator E generates an oscillating signal; the delay counting module F is used for delaying counting when the oscillator module E oscillates at a certain frequency; and the protection triggering judgment module G triggers protection for a direct-current loudspeaker according to the delay time of the delay counting module F. The circuit provided in the invention is capable of protecting not only the power amplifier module but also the loudspeaker equipment against being damaged by an abnormal input signal, and simultaneously is capable of preventing broken sound caused by the abnormal input signal, therefore, the system humanization is enhanced.

Description

technical field [0001] The purpose of the invention is to improve the safety and reliability of the audio power amplifier circuit in actual use, and prevent damage to the loudspeaker caused by direct current due to improper operation and abnormal peripheral components. It belongs to the field of integrated circuits. Background technique [0002] With the development of communication and multimedia technology, audio technology has penetrated into all aspects of people's lives, and is constantly advancing towards smaller volume, more perfect sound quality, higher efficiency, and higher reliability. This is also the audio power amplifier product. The reason for the long-lasting charm. Because it is closely related to the lives of modern people, the reliability design of such circuits has always been the focus of attention in the design of such products. Therefore, such circuits generally have designs such as over-temperature protection, over-current protection, over-voltage p...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of DC overload of the speaker caused by the short circuit of the DC blocking capacitor of the audio power amplifier or misoperation, according to the characteristics of the audio signal, to provide a speaker protection circuit for the audio power amplifier to prevent DC overload,

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