Device and method for automatically detecting abnormality of power amplifier

Abstract

The invention provides a device and a method for automatically detecting abnormality of a power amplifier. The device comprises a power amplifier voltage detecting circuit used for detecting a voltage value output from the power amplifier to a loudspeaker, a power amplifier voltage abnormality judging circuit used for outputting a normal voltage level signal or an abnormal voltage level signal through an offset port, a microcontroller used for counting normal voltage electric pulses or abnormal voltage level pulses output by the offset port within a set period, determining the state of the power amplifier, and sending a power amplifier abnormality signal if the power amplifier is determined to be in an abnormal state, and a buzzer connected to the microcontroller and used for receiving the power amplifier abnormality signal and sending an abnormality prompt acoustical signal, wherein the abnormal prompt acoustical signal after being amplifier by the power amplifier is played through the loudspeaker. According to the invention, automatic detection of the voltage abnormality condition of the power amplifier is realized and manual detection is unnecessary; acoustical alarm or image display alarm is carried out if the power amplifier is abnormal, and the power amplifier is shut down after a set time period to protect the loudspeaker connected to the power amplifier.

Description

technical field [0001] The invention relates to the technical field of car audio, in particular to a device and method for automatically detecting abnormality of a power amplifier. Background technique [0002] The power amplifier is referred to as the power amplifier, commonly known as the "amplifier", which is the most basic equipment in the audio system. Its function is to amplify the weak electrical signal from the sound signal source (in the professional audio system, it comes from the mixer) or the pre-amplifier. To drive the speaker to produce sound. Due to the consideration of power, impedance, distortion, dynamics, and different use ranges and control adjustment functions, different power amplifiers are also different in internal signal processing, circuit design and production technology. [0003] The common failures of the power amplifier include the whole machine not working, no sound output, light sound, loud noise, distortion, howling, etc. The detection meth...

AI Technical Summary

Problems solved by technology

[0009] To sum up, the existing power amplifier abnormality detection method is cumbersome and complicated, and cannot realize automatic detection of power amplifier abnormality, which wastes manpower and material resources; moreover, there is no power amplifier abnormality detection function on the vehicle entertainment terminal. When the voltage output from the power amplifier to the speaker is abnormal, the speaker easily burned

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