Protection method and device for automatically regulating volume of loudspeaker according to temperature raising of voice coil

Abstract

The invention discloses a protection method for automatically regulating a volume of a loudspeaker according to temperature raising of a voice coil. The protection method comprises the following stepsof: S1: acquiring a current value and a voltage value of an audio of the loudspeaker, and carrying out Fourier transform on the current value and the voltage value; S2: according to a frequency valueafter Fourier transform, obtaining an impedance curve of the voice coil; S3: reading the impedance curve, searching a nominal impedance RAC of the loudspeaker on the impedance curve, and according toa voice coil power and tolerance table corresponding to a material of the voice coil and according to a formula that RDC=RAC-XL(f1), obtaining a direct current resistance RDC, wherein the XL(f1) represents a voice coil inductance inductive impedance of of the loudspeaker under a frequency f1 corresponding to the nominal impedance; S4: carrying out comparison on a resistance value RDC of the acquired direct current resistance and a preset standard resistance value to obtain a resistance variation percentage; and S5: according to the resistance variation percentage and a metal temperature coefficient, calculating the temperature raising, and when the temperature raising exceeds a preset value, regulating input power of the loudspeaker by an attenuation signal. The protection method disclosed by the invention is accurate to monitor, wide in applicability and high in protection.

Description

Technical field [0001] The invention relates to the field of loudspeakers, in particular to a protection method and device for automatically adjusting the volume of the loudspeaker according to the temperature rise of the loudspeaker. Background technique [0002] Electrodynamic speakers are the mainstream speakers in audio systems. The speakers mentioned in this article refer to electrodynamic speakers. The sounding principle is: the audio alternating current generates an alternating magnetic field through the speaker voice coil, and the force of the fixed magnetic field of the speaker magnet drives the speaker cone to vibrate to produce sound. The speaker is a weak link in the sound system and is the most vulnerable to damage. For sound effects, the speaker is the most important component. [0003] From the above knowledge, the voice coil is equivalent to the heart of the speaker. It has been learned from practice that the main reason for speaker damage is that the power fed t...

AI Technical Summary

Problems solved by technology

However, if the power fed back to the speaker is too large, the temperature may rise to 200°C or higher, and the auxiliary materials such as glue and resin around the voice coil will start to melt, and the voice coil will be damaged.

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