Power amplifier main/standby switcher and power amplifier fault determination method thereof

Abstract

The invention discloses a power amplifier main / standby switcher and a power amplifier fault determination method thereof. The method comprises steps that, an active audio signal is emitted by a detection signal generator; the active audio signal sequentially passing through gain adjustment, mixing and adjustment through an input switch control module is amplified by a power amplifier unit of a corresponding channel or a standby power amplifier unit to acquire the amplified active audio signal; the amplified active audio signal is detected through a signal detection module, and a state of the power amplifier unit is determined according to whether the detected amplification signal is amplified by a preset amplification time. According to the method, the detection signal generator can emit the active audio signal, a problem that a traditional detection module in operation requires an externally-inputted audio detection signal is solved, fault determination can be carried out before use and during use of a sound equipment system, complex operation such as power-on system detection and tuning the volume of a preamplifier to the largest volume can be avoided, operation is simple and convenient, efficiency is high, and the method is relatively reliable and can be widely applied to the power amplifier field.

Description

technical field [0001] The invention relates to the field of power amplifiers, in particular to a power amplifier active / standby switcher and a power amplifier fault judgment method thereof. Background technique [0002] The power amplifier undertakes the task of power amplification in the audio system. It needs high voltage and high current drive to work. It is prone to failures such as over-temperature, over-current, instantaneous protection, and component damage. It is the weak link of the audio system. In some important sound reinforcement occasions, in order to ensure the working stability of the sound system, the method of replacing the main and standby power amplifiers is usually used to realize the reliability of the continuous operation of the power amplifier link. The traditional power amplifier master-standby switcher is composed of a main power amplifier and a spare power amplifier, but it cannot meet the needs of multi-channel audio input sound reinforcement; la...

AI Technical Summary

Problems solved by technology

The traditional power amplifier master-standby switcher is composed of a main power amplifier and a spare power amplifier, but it cannot meet the needs of multi-channel audio input sound reinforcement; later, on this basis, it has developed into a working method for replacing multi-master and multi-standby power amplifiers. That is to say, each main power amplifier is equipped with a spare power amplifier, but this kind of working method needs to be equipped with multiple spare power amplifiers, which wastes hardware resources and is inefficient

[0003] In recent years, the replacement working mode of multi-master and one backup has appeared. Its working principle is to judge whether a fault occurs and switch by detecting the amplification factor of the audio amplification signal of the rear stage of the power amplifier. When inputting an audio detection signal from the outside, and the pre-volume needs to be adjusted to the maximum to detect the amplification factor of the audio signal in the rear stage of the power amplifier, so as to make a judgment, the operation is cumbersome and the efficiency is extremely low

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