Output control system for audio power amplifier and electronic apparatus with system

Abstract

The invention provides an output control system for an audio power amplifier. The output control system for the audio power amplifier comprises a switch module, a voltage division module and a processing module, wherein the switch module is connected with the audio power amplifier and speakers, and is used for outputting audio signals output by the audio power amplifier or preventing from outputting the audio signals to the speakers; the voltage division module is connected with the audio power amplifier and the switch module, and is used for dividing the voltage provided by an external power supply; the processing module is connected with the voltage division module, comprises an analog-to-digital conversion interface and an universal input / output interface, and is used for reading a voltage value which is divided by the voltage division module and is output to the analog-to-digital conversion interface and judging whether the voltage value of the analog-to-digital conversion interface is smaller than a preset voltage threshold; if the voltage value of the analog-to-digital conversion interface is smaller than the preset voltage threshold, the processing module pulls up the voltage of the universal input / output interface and enables the switch module; if the voltage value of the analog-to-digital conversion interface is not smaller than the preset voltage threshold, the voltage of the universal input / output interface is low level, and the processing module disables the switch module. The output control system for the audio power amplifier, which is provided by the invention, can protect the output of the audio power amplifier and prevents external high voltage from damaging the audio power amplifier.

Description

technical field [0001] The invention belongs to the technical field of automobiles and relates to a control system, in particular to an output control system of an audio power amplifier and electronic equipment with the system. Background technique [0002] T-Box is a very important part of today's interconnected car in-vehicle system. Its main function is to realize the interconnection between the car and TSP. When a serious accident occurs, TBOX can also automatically make an emergency call. Usually T-Box is connected with a special speaker for emergency calls, and TBOX has a built-in audio amplifier to drive the speaker. Today's mainstream audio power amplifiers are generally BTL (Bridge Tied Load) output, that is, bridge output. It is forbidden to connect this output to an input voltage greater than the audio power amplifier, otherwise the audio power amplifier will be burned. TBOX communicates with the car through a wire harness with dozens of signals on it. When the c...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an output control system of an audio power amplifier and an electronic device with the system, which is used to solve the problem in the prior art that the signal that should be connected to the loudspeaker is caused by a worker's misoperation. Wrong connection to the vehicle battery interface or other voltage-bearing interfaces, causing the voltage of the vehicle battery to damage the audio power amplifier, depleting the power of the battery, or the audio power amplifier generates a large amount of heat through a large current for a long time, causing other dangerous problems

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