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Non-thermal resistance prediction method for power compression of coil driven loudspeaker

A prediction method and loudspeaker technology, applied in the direction of electrical components, etc., can solve the problems of tediousness, inaccurate results, and no power compression calculation method without thermal resistance.

Inactive Publication Date: 2009-03-25
NANJING UNIV
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Problems solved by technology

[0020] In summary, the existing technical methods are based on thermal resistance to measure and calculate power compression, which is not only cumbersome but also inaccurate.
[0021] No thermal resistance-free power compression calculation method has been proposed so far

Method used

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  • Non-thermal resistance prediction method for power compression of coil driven loudspeaker
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  • Non-thermal resistance prediction method for power compression of coil driven loudspeaker

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Embodiment Construction

[0035] figure 1 , 2 is the basic method of the present invention.

[0036] Process flow of the present invention such as figure 1 shown. The DC resistance of the voice coil increases with the increase of the temperature of the voice coil, and the relationship is:

[0037] R eTc = R eTa (1+kΔT)R eTc is the voice coil DC resistance after heating, R eTa is the DC resistance of the voice coil before heating up, ΔT is the temperature difference between front and back, k is the temperature coefficient of the voice coil material, and for a moving coil speaker whose voice coil material is copper, it is 0.00393K -1 .

[0038] The power compression effect means that when the speaker is working, the temperature of the voice coil increases and the DC resistance of the voice coil increases. In the case of constant voltage input of the speaker, according to P=U 2 / R, the power fed to the speaker will drop, which will eventually lead to a drop in sensitivity and radiation efficiency...

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Abstract

The invention relates to a prediction method for power compression of a coil driven loudspeaker without thermal resistance. For arbitrary coil driven loudspeaker, the impedance curve and the temperature variation of a voice coil are measured, the power compression value of a characteristic frequency point is calculated through the computing formula of the power compression without thermal resistance, then a modified coefficient is calculated through the modified formula, and finally power compression curves under different input power conditions are obtained. Based on the measured impedance curve and the temperature variation of the voice coil, the computing formula of the power compression without thermal resistance is adopted for calculating, and the computing formula is as follows: PC is equal to 10log10, wherein, the power compression indicates the relative reducing of the frequency response amplitude of the coil driven loudspeaker under different input power conditions.

Description

technical field [0001] The invention relates to a prediction method for power compression of a moving coil loudspeaker, which is a novel non-thermal resistance prediction method based on the measurement of the impedance curve and the temperature rise curve of the moving coil loudspeaker unit. Background technique [0002] Loudspeakers are electroacoustic transducers that convert electrical signals into acoustic signals and radiate them to the surrounding medium. Speakers can be divided into dynamic, electromagnetic, electrostatic, piezoelectric, ion, etc. according to the energy conversion method. Among them, dynamic speakers are widely used and play an important role in life and engineering applications. [0003] Dynamic coil speakers have different temperature rises when they work under different power input conditions. The reason for the temperature rise is the heating of the voice coil. According to the temperature characteristics of the voice coil material, its DC resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 沈勇吴志成王旭王晓楠孙飞
Owner NANJING UNIV
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